2008-12-31 Tracking News

Contents on 31 December '08

Radar Astrometry -- two objects
IAU Minor Planet Center
- NEOCP Activity -- nine listings: 9 updated
- New MPECs -- eight MPECs
Observers -- 59 observing facilities
Impact Risk Monitoring -- seven objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest A/CC news is available via framed access, RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

Radar Astrometry on 31 December '08

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 0059 UTC when the database was dated 30 Dec.

184266 2004 VW14 from Arecibo (April 11.35 velocity & 11.35 range)
4660 Nereus (1982 DB) from Arecibo (2001 Dec. 20.95 velocity, 20.95 range, 2002 Jan. 9.83 velocity, 9.83 range, 10.82 velocity, 10.82 range, 11.81 velocity, 11.81 range, 12.81 velocity, 12.81 range, 13.77 velocity & 13.77 range) and Goldstone DSS-14 70m antenna (2002 Jan. 15.83 velocity, 15.83 range, 18.92 velocity, 18.92 range, 19.83 velocity, 19.83 range, 20.89 velocity, 20.89 range, 23.74 velocity, 23.74 range, 24.68 velocity, 24.68 range, 25.74 velocity, 25.74 range, 26.69 velocity, 26.69 range, 27.70 velocity, 27.70 range, 29.70 velocity & 29.70 range)

NEOCP Activity on 31 December '08

The MPC's NEO Confirmation Page has 9 listings: 9 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine updated listings. Of these, eight were "one nighters." The Tracking News counted a total of 24 objects listed on the NEOCP at some point on this day.

New MPECs on 31 December '08

Minor Planet Electronic Circulars

There were eight MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-Y79 time-stamped "05:23 UT" - Observations of Comets - see below
MPEC 2008-Y80 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2008-Y81 time-stamped "15:08 UT" - 2008 YE30 - see below
MPEC 2008-Y82 time-stamped "15:12 UT" - 2008 YF30 - see below
MPEC 2008-Y83 time-stamped "15:14 UT" - 2008 YG30 - see below
MPEC 2008-Y84 time-stamped "15:17 UT" - 2008 YH30 - see below
MPEC 2008-Y85 time-stamped "21:46 UT" - 2008 YT30 - see below
MPEC 2008-Y86 time-stamped "21:51 UT" - 2008 YU30

MPEC 2008-Y86 - "21:51 UT" - 2008 YU30

K08Y30U 2008 YU30 (risk-listed, Q=4.743 AU, H=23.0 ~85m) was discovered at 0731 UT on 31 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 31.31-34p4, 31.44-45p4, and 31.50-52p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Dec. 31.46-47p6) and Sabino Canyon Obs. (Dec. 31.48-49p2).

MPEC 2008-Y85 - "21:46 UT" - 2008 YT30

K08Y30T 2008 YT30 (risk-listed, H=19.1 ~513m) was discovered at 0210 UT on 31 Dec. by the Spacewatch 0.9m telescope, which observed it at Dec. 31.09-12p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Dec. 31.16-17p3, 31.28-29p3 & 31.38p3), MRO (Dec. 31.35-36p4), and Engelhardt Obs. Zelenchukskaya Station (Dec. 31.64-65p3).

MPEC 2008-Y84 - "15:17 UT" - 2008 YH30

K08Y30H 2008 YH30 (risk-listed, Earth MOID=3.3 LD, H=26.9 ~14m) was discovered at 0701 UT on 31 Dec. by Spacewatch 0.9m, which observed it at Dec. 31.29-33p3. The discovery was confirmed by Spacewatch 1.8m (Dec. 31.40-41p3 & 31.46p3) and MRO (Dec. 31.42-43p4).

MPEC 2008-Y83 - "15:14 UT" - 2008 YG30

K08Y30G 2008 YG30 (small asteroid, Earth MOID=0.7 LD, H=24.5 ~43m) was discovered at 0633 UT on 31 Dec. by CSS, which observed it at Dec. 31.27-30p4, 31.35p2, and 31.49p4. The discovery was confirmed by MRO (Dec. 31.39-40p5) and Sabino Canyon Obs. (Dec. 31.46p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 3.7 LD on 5 Jan.

MPEC 2008-Y82 - "15:12 UT" - 2008 YF30

K08Y30F 2008 YF30 (risk-listed, H=24.3 ~47m) was discovered at 0511 UT on 31 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 31.22-25p7. The discovery was confirmed by MRO (Dec. 31.31-32p5).

MPEC 2008-Y81 - "15:08 UT" - 2008 YE30

K08Y30E 2008 YE30 (Q=4.145 AU, H=20.9 ~224m) was discovered at 1114 UT on 30 Dec. by Spacewatch 0.9m, which observed it at Dec. 22.42-46p3 and 30.47-50p3. The discovery was confirmed by Spacewatch 1.8m (Dec. 30.54-55p3, 31.31-32p3 & 31.48p3).

<< DOU on 31 Dec. '08 >> MPEC 2008-Y80 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K08Y29F 2008 YF29 (small asteroid, arc=1 day, H=24.0 ~54m) from Spacewatch 1.8m (Dec. 31.14p2)
K08Y29E 2008 YE29 (Q=4.309 AU, arc=1 day, H=20.1 ~323m) from San Marcello Pistoiese Obs. (Dec. 30.74-76p3), Inastars Obs. (Dec. 30.77-78p4), and Spacewatch 1.8m (Dec. 31.12-13p3)
K08Y03C 2008 YC3 (small asteroid, arc=9 days, H=25.5 ~27m) from Great Shefford Obs. (Dec. 30.91p2)
K08X02U 2008 XU2 (small asteroid, Q=4.004 AU, arc=24 days, H=25.6 ~26m) from Astronomical Research Obs. (ARO) (Dec. 30.21-27p3 at V=23.3-7)
Observations of recently (no longer) risk-listed objects
K08Y03J 2008 YJ3 (arc=8 days, H=20.2 ~309m) from ARO (Dec. 30.10-11p3)
K08Y02N 2008 YN2 (small asteroid, arc=9 days, H=26.3 ~19m) from ARO (Dec. 30.13-15p3 at V=21.9-22.1)
K08W96K 2008 WK96 (small asteroid, arc=30 days, H=23.1 ~81m) from ARO (Dec. 30.21-23p3)
Observations of small asteroids (H>22.0)
K08Y29G 2008 YG29 (arc=1 day, H=23.9 ~56m) from Guidestar Obs. (Dec. 30.87-91p3) and Great Shefford Obs. (Dec. 30.88-89p2)
K08Y27Q 2008 YQ27 (arc=3 days, H=22.4 ~112m) from Great Shefford Obs. (Dec. 30.76-77p3)
K08Y27M 2008 YM27 (arc=1 day, H=23.5 ~68m) from ARO (Dec. 30.13-14p4) and CSS (Dec. 30.25-27p3)
K08Y03G 2008 YG3 (Q=4.020 AU, arc=8 days, H=22.1 ~129m) from ARO (Dec. 30.12p4)
K08V15A 2008 VA15 (arc=52 days, H=23.6 ~65m) from ARO (Dec. 30.32-34p3)
K08V14H 2008 VH14 (Q=4.701 AU, arc=52 days, H=23.6 ~65m) from ARO (Dec. 30.37-38p2) and Spacewatch 1.8m (Dec. 30.49-50p3)
J99A39J 1999 AJ39 (arc=3 opp, H=22.2 ~123m) from MLS (Dec. 30.38-42p4 at V=21.8-22.2)
Observations of almost-small asteroids (21.7<H<=22.0)
K08Y29D 2008 YD29 (Q=5.340 AU, arc=1 day, H=22.0 ~135m) from ARO (Dec. 30.16-18p3)
K08W00L 2008 WL (Q=4.485 AU, arc=42 days, H=21.8 ~148m) from ARO (Dec. 30.19-20p3)
Observations of other objects
K08Y28Z 2008 YZ28 (arc=1 day, H=20.1 ~323m) from San Marcello Pistoiese Obs. (Dec. 30.72-73p3), CAST Obs. (Dec. 30.74-75p2), and Guidestar Obs. (Dec. 30.80-82p3)
K08Y27R 2008 YR27 (arc=23 days, H=18.1 ~812m) from Farra d'Isonzo Obs. (Dec. 30.04-06p3), Kanab Obs. (Dec. 30.35-39p2), and San Marcello Pistoiese Obs. (Dec. 30.86-87p3)
K08Y27O 2008 YO27 (i=40.6°, arc=1 day, H=20.7 ~245m) from ARO (Dec. 30.15-16p4) and CSS (Dec. 30.30-32p4)
K08Y27N 2008 YN27 (arc=1 day, H=21.5 ~170m) from LINEAR (Dec. 30.20-26p5)
K08Y26G 2008 YG26 (arc=1 day, H=21.4 ~178m) from ARO (Dec. 30.07-08p5) and CSS (Dec. 30.17-18p3)
K08Y03F 2008 YF3 (arc=9 days, H=21.3 ~186m) from ARO (Dec. 30.13p3)
K08Y03E 2008 YE3 (arc=8 days, H=20.9 ~224m) from ARO (Dec. 30.27-28p5) and Petit Jean Mtn. South Obs. (PJMSO) (Dec. 30.31-32p6)
K08Y02R 2008 YR2 (arc=9 days, H=18.5 ~676m) from LINEAR (Dec. 22.41-45p6), Great Shefford Obs. (Dec. 30.13-15p3), and CSS (Dec. 30.44-46p3)
K08Y02K 2008 YK2 (arc=10 days, H=19.6 ~407m) from ARO (Dec. 30.29p6)
K08Y00F 2008 YF (arc=12 days, H=20.9 ~224m) from Guidestar Obs. (Dec. 30.94-96p3)
K08X03E 2008 XE3 (Q=4.045 AU, arc=2 opp, H=16.3 ~1.86 km) from PJMSO (Dec. 30.30-31p6)
K08X02E 2008 XE2 (arc=26 days, H=19.2 ~490m) from ARO (Dec. 30.30-31p3)
K08X02A 2008 XA2 (arc=26 days, H=21.4 ~178m) from Spacewatch 1.8m (Dec. 30.28-29p3)
K08X01B 2008 XB1 (arc=27 days, H=20.9 ~224m) from LINEAR (Dec. 30.21-25p4)
K08X00M 2008 XM (q=0.111 AU, arc=28 days, H=19.8 ~371m) from ARO (Dec. 30.03-06p3 at V=21.9-22.3)
K08W63Q 2008 WQ63 (arc=38 days, H=20.1 ~323m) from Smolyan Obs. (Dec. 25.05-06p5) and PJMSO (Dec. 30.33-34p8)
K08W61L 2008 WL61 (arc=37 days, H=19.5 ~426m) from Spacewatch 1.8m (Dec. 31.24p2 at V=22.1-2)
K08W60L 2008 WL60 (arc=37 days, H=18.2 ~776m) from Smolyan Obs. (Dec. 22.96-97p3), PJMSO (Dec. 30.27p5), and Hamamatsu-Yuto Obs. (Dec. 30.65-68p3)
K08W60J 2008 WJ60 (arc=37 days, H=21.2 ~195m) from Spacewatch 1.8m (Dec. 30.41-42p3)
K08W32X 2008 WX32 (arc=59 days, H=19.0 ~537m) from Spacewatch 1.8m (Dec. 31.21-22p3)
K08W02N 2008 WN2 (arc=67 days, H=20.8 ~234m) from CSS (Dec. 30.17-19p4)
K08V14K 2008 VK14 (arc=52 days, H=19.4 ~446m) from PJMSO (Dec. 30.28p6)
K08V14G 2008 VG14 (Q=4.381 AU, arc=53 days, H=20.3 ~295m) from ARO (Dec. 30.08-11p3 at V=22.2-4) and Spacewatch 1.8m (Dec. 30.30-31p3)
K08U95C 2008 UC95 (arc=62 days, H=18.6 ~645m) from Smolyan Obs. (Dec. 25.09-10p3) and PJMSO (Dec. 30.32-33p6)
K08TF7K 2008 TK157 (arc=98 days, H=20.6 ~257m) from CSS (Dec. 30.18-19p3)
K08SO5X 2008 SX245 (arc=2 opp, H=17.8 ~933m) from Desert Moon Obs. (Dec. 30.10-16p3)
K08S82J 2008 SJ82 (arc=95 days, H=20.6 ~257m) from Spacewatch 1.8m (Dec. 31.11-12p3)
K08S82H 2008 SH82 (arc=96 days, H=21.4 ~178m) from ARO (Dec. 30.09-10p4), PJMSO (Dec. 30.22-23p7), and Drebach Obs. (Dec. 30.81p6)
K08S07V 2008 SV7 (arc=97 days, H=21.6 ~162m) from ARO (Dec. 30.18p3)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.5 ~676m) from Smolyan Obs. (Dec. 26.90p3), LINEAR (Dec. 30.20-25p5), PJMSO (Dec. 30.22p6), and Drebach Obs. (Dec. 30.81-82p5)
K08R98G 2008 RG98 (arc=112 days, H=17.2 ~1.23 km) from Desert Moon Obs. (Dec. 30.05-07p3)
K08R26T 2008 RT26 (arc=115 days, H=19.4 ~446m) from Mirasteilas Obs. (Dec. 31.05-06p3)
K08Q03T 2008 QT3 (arc=127 days, H=18.7 ~616m) from ARO (Dec. 30.04-05p4) and LINEAR (Dec. 30.07-12p5)
K08M05B 2008 MB5 (arc=183 days, H=19.1 ~513m) from LINEAR (Dec. 30.44-47p4)
K08M00Z 2008 MZ (Q=4.207 AU, arc=198 days, H=18.6 ~645m) from PJMSO (Dec. 30.23-24p6)
K08E05V 2008 EV5 (arc=2 opp, H=20.1 ~323m) from ARO (Dec. 30.26-27p8) and PJMSO (Dec. 30.29-30p8)
K07D08K 2007 DK8 (arc=2 opp, H=19.0 ~537m) from Spacewatch 1.8m (Dec. 30.43-45p3)
K06W02Z 2006 WZ2 (arc=3 opp, H=16.9 ~1.41 km) from Smolyan Obs. (Dec. 25.15-16p3)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from Smolyan Obs. (Dec. 26.88-89p2) and PJMSO (Dec. 30.16-17p5)
K05N01J 2005 NJ1 (arc=4 opp, H=18.7 ~616m) from LINEAR (Dec. 30.45-51p4)
K05B00C 2005 BC (arc=2 opp, H=18.0 ~851m) from Smolyan Obs. (Dec. 25.11p3), PJMSO (Dec. 30.34p5), and Hamamatsu-Yuto Obs. (Dec. 30.80-82p4)
K05A28Y 2005 AY28 (q=0.375 AU, arc=2 opp, H=21.7 ~155m) from Spacewatch 1.8m (Dec. 31.19-20p2)
K04RG4Z 2004 RZ164 (Q=4.120 AU, arc=2 opp, H=19.0 ~537m) from Spacewatch 1.8m (Dec. 31.07-08p3)
K04L03V 2004 LV3 (arc=2 opp, H=18.9 ~562m) from PJMSO (Dec. 30.14-15p8) and Hamamatsu-Yuto Obs. (Dec. 30.52-53p3)
K03Y00L 2003 YL (arc=4 opp, H=19.8 ~371m) from Spacewatch 0.9m (Dec. 30.46-50p3)
K03X22B 2003 XB22 (arc=3 opp, H=19.2 ~490m) from MLS (Dec. 30.29-32p4)
K03R00B 2003 RB (arc=4 opp, H=18.7 ~616m) from MLS (Dec. 30.38-42p4)
K03K02U 2003 KU2 (Q=4.516 AU, arc=3 opp, H=17.7 ~977m) from ARO (Dec. 30.30-35p3 at V=22.8-23.1)
K02X90P 2002 XP90 (arc=3 opp, H=18.5 ~676m) from Mirasteilas Obs. (Dec. 30.99-00p3)
K02V94Y 2002 VY94 (Q=5.375 AU, arc=2 opp, H=16.8 ~1.48 km) from CSS (Dec. 30.19-21p4)
K02C01M 2002 CM1 (i=45.0°, arc=3 opp, H=16.9 ~1.41 km) from ARO (Dec. 30.35-36p3)
K02A04U 2002 AU4 (arc=4 opp, H=19.0 ~537m) from PJMSO (Dec. 30.15-16p5)
K01L05M 2001 LM5 (arc=3 opp, H=19.3 ~467m) from LINEAR (Dec. 30.19-25p5)
K01F09X 2001 FX9 (arc=4 opp, H=18.6 ~645m) from LINEAR (Dec. 30.37-42p5)
K00WA7M 2000 WM107 (Q=4.085 AU, arc=3 opp, H=18.8 ~589m) from MLS (Dec. 30.12-15p4)
K00F01L 2000 FL1 (i=43.6°, Q=4.178 AU, arc=2 opp, H=15.5 ~2.69 km, q=1.291 AU) from Smolyan Obs. (Dec. 25.13-14p3)
J99A10Q 1999 AQ10 (arc=4 opp, H=20.3 ~295m) from PJMSO (Dec. 30.35p5)
J98Q02E 1998 QE2 (arc=5 opp, H=16.6 ~1.62 km) from Desert Moon Obs. (Dec. 30.28-31p3)
K0840 200840 2001 XN254 from LINEAR (Dec. 30.20-26p5)
K0754 200754 2001 WA25 from LINEAR (Dec. 30.27-32p5)
J9003 199003 2005 WJ56 from the Siding Spring Survey (SSS) (Dec. 30.72-73p4)
I9973 189973 2003 XE11 from LINEAR (Dec. 30.07-11p4)
G4400 164400 2005 GN59 from SSS (Dec. 30.68-71p4)
G2361 162361 2000 AF6 from Castelmartini Obs. (Dec. 29.88-89p5)
F4988 154988 2004 XN35 from MLS (Dec. 30.34-36p4)
F4007 154007 2002 BY from Spacewatch 1.8m (Dec. 30.15-16p3)
E2348 142348 2002 RX211 from Castelmartini Obs. (Dec. 29.90-91p3), Spacewatch 1.8m (Dec. 30.21p3), and LINEAR (Dec. 30.32-38p5)
D6849 136849 1998 CS1 from Castelmartini Obs. (Dec. 29.91-92p5)
96315 96315 1997 AP10 from LINEAR (Dec. 30.27-31p4)
89355 89355 2001 VS78 from Castelmartini Obs. (Dec. 29.90p3)
85990 85990 1999 JV6 from MLS (Dec. 30.51-53p4)
55532 55532 2001 WG2 from CSS (Dec. 30.17-19p4)
53430 53430 1999 TY16 from SSS (Dec. 30.54-57p4)
53319 53319 1999 JM8 from CSS (Dec. 30.14-16p4)
20460 20460 Robwhiteley (1999 LO28) from Deep Sky Obs. (Dec. 29.87-90p6)
08567 8567 1996 HW1 from CSS (Dec. 30.17-19p4)
05143 5143 Heracles (1991 VL) from LINEAR (Dec. 30.07-11p4) and CSS (Dec. 30.11-13p4)
04183 4183 Cuno (1959 LM) from Tentlingen Obs. (Dec. 29.75-79p3)
04179 4179 Toutatis (1989 AC) from LINEAR (Dec. 30.33-38p5)
03360 3360 Syrinx (1981 VA) from LINEAR (Dec. 30.13-18p5)
03200 3200 Phaethon (1983 TB) from Deep Sky Obs. (Dec. 29.74-79p6)
02368 2368 Beltrovata (1977 RA) from LINEAR (Dec. 30.32-37p5) and Mirasteilas Obs. (Dec. 31.07-08p3)
01943 1943 Anteros (1973 EC) from SSS (Dec. 30.68-71p4)
01627 1627 Ivar (1929 SH) from Vicksburg Obs. (Dec. 30.08-09p3) and LINEAR (Dec. 30.19-24p5)

MPEC 2008-Y79 - "05:23 UT" - Observations of Comets

PK08X010 P/2008 X1 (Hill) from Geisei Obs. (Dec. 19.39p1, 25.49-51p3 & 27.63-64p3), Moriyama Obs. (Dec. 30.62-63p2), Buchloe Obs. (Dec. 30.75p3), and CAST Obs. (Dec. 30.83p1)
PK08T040 P/2008 T4 (Hill) from Ageo Obs. (Dec. 21.52-53p2) and LINEAR (Dec. 29.13-18p5 & 30.13-18p5)
CK08T020 C/2008 T2 (Cardinal) from Altamira Obs. (Dec. 23.91-92p3) and Monte Deva Obs. (Dec. 28.92-93p5)
PK08T010 P/2008 T1 (Boattini) from Nazaret Obs. (Dec. 10.89-90p4) and Chante-Perdrix Obs. (Dec. 28.78-79p3)
CK08S030 C/2008 S3 (Boattini) from MLS (Dec. 22.16-18p4), the SZTE Asteroid Program (SZTE) (Dec. 27.82-84p3 & 28.82-84p3), and Nazaret Obs. (Dec. 27.89-91p4)
CK08R030 C/2008 R3 (LINEAR) from Ageo Obs. (Dec. 23.44p2), Altamira Obs. (Dec. 23.85-86p4), and Moriyama Obs. (Dec. 30.46p2)
PK08Q20P P/2008 QP20 (LINEAR-Hill) from Ageo Obs. (Dec. 20.51-52p3), Borken Obs. (Dec. 28.83p1), PJMSO (Dec. 30.18-20p6), and Moriyama Obs. (Dec. 30.51-53p2)
PK08Q020 P/2008 Q2 (Ory) from Gieres Obs. (Nov. 27.96p1), Bedoin Obs. (Dec. 23.85-87p3), Nazaret Obs. (Dec. 27.86-88p4), PJMSO (Dec. 29.24-25p6 & 30.21p6), and LINEAR (Dec. 30.20-25p5)
CK08P010 C/2008 P1 (Garradd) from North Ryde Obs. (Dec. 16.44-46p2, 20.46-48p2, 25.44-45p2 & 26.43-45p2), Grove Creek Obs. (Dec. 21.44p1), and Altamira Obs. (Dec. 25.89-91p3)
CK08N010 C/2008 N1 (Holmes) from Altamira Obs. (Dec. 23.82-84p4) and Chante-Perdrix Obs. (Dec. 28.76-77p2)
PK08L020 P/2008 L2 (Hill) from Bedoin Obs. (Dec. 23.81-82p3) and LINEAR (Dec. 29.13-18p5 & 30.13-18p4)
PK08J030 P/2008 J3 (McNaught) from Schiaparelli Obs. (Dec. 7.74p1), Bedoin Obs. (Dec. 23.74-75p3), and Buchloe Obs. (Dec. 28.72p3)
CK08J010 C/2008 J1 (Boattini) from Altamira Obs. (Dec. 25.96-97p2) and La Dehesilla Obs. (Dec. 26.89-91p3)
CK08F75K C/2008 FK75 (2008 FK75) from Altamira Obs. (Dec. 26.27-29p6) and Chante-Perdrix Obs. (Dec. 28.24p1)
CK08E010 C/2008 E1 (Catalina) from North Ryde Obs. (Dec. 26.58-61p2 & 28.50p1), Geisei Obs. (Dec. 27.67p3), and Kambah Obs. (Dec. 28.60-63p2)
CK08A010 C/2008 A1 (McNaught) from La Vara Obs. (Dec. 21.77p1 & 28.78p2)
CK07U010 C/2007 U1 (LINEAR) from Smolyan Obs. (Dec. 26.81-82p5) and CAST Obs. (Dec. 30.79p1)
CK07S020 C/2007 S2 (Lemmon) from Ageo Obs. (Dec. 27.74-75p2) and Sandlot Obs. (Dec. 30.42-48p3)
CK07Q030 C/2007 Q3 (Siding Spring) from North Ryde Obs. (Dec. 16.48-49p2, 20.49-52p2, 25.46-49p2, 26.46-49p2 & 28.45-47p2), Altamira Obs. (Dec. 26.04-05p4), and Kambah Obs. (Dec. 28.49p2)
CK07N030 C/2007 N3 (Lulin) from Geisei Obs. (Dec. 23.87-88p3), Chante-Perdrix Obs. (Dec. 28.26p2), RAS Obs. Mayhill (Dec. 28.54p1), and Yatsuka Obs. (Dec. 28.89p3)
CK06W030 C/2006 W3 (Christensen) from Gieres Obs. (Dec. 8.98p1), La Vara Obs. (Dec. 21.79p1, 22.84p1 & 28.81-82p3), RAS Mayhill (Dec. 25.09-12p3), Altamira Obs. (Dec. 25.81-82p4), Smolyan Obs. (Dec. 26.84-85p4), Nazaret Obs. (Dec. 27.81p3 & 28.83-84p3), Buchloe Obs. (Dec. 28.74-75p6), Monte Deva Obs. (Dec. 28.90-91p5), Vicksburg Obs. (Dec. 30.01-02p3), Moriyama Obs. (Dec. 30.48p2), and CAST Obs. (Dec. 30.77p1)
CK06U060 C/2006 U6 (Spacewatch) from Altamira Obs. (Dec. 26.17-19p5) and North Ryde Obs. (Dec. 28.69-71p2)
CK06O02F C/2006 OF2 (Broughton) from Gieres Obs. (Dec. 8.93p1, 19.99p1 & 20.88p1), Manises Obs. (Dec. 21.81-82p3), Altamira Obs. (Dec. 26.08-09p6), Smolyan Obs. (Dec. 26.85-86p3), Chante-Perdrix Obs. (Dec. 27.96p1 & 28.98p1), Montana Cabreja Obs. (Dec. 28.14-16p2), PJMSO (Dec. 28.29-30p6), La Vara Obs. (Dec. 28.82p3), Monte Deva Obs. (Dec. 29.01-02p4), CAST Obs. (Dec. 29.77p1), and Wormhout Obs. (Dec. 29.89-93p3)
CK06K040 C/2006 K4 (NEAT) from North Ryde Obs. (Dec. 20.54p1, 20.59p1, 26.53p1 & 28.64p1) and Kambah Obs. (Dec. 26.57-59p3 & 28.57p2)
CK06K010 C/2006 K1 (McNaught) from Ageo Obs. (Dec. 15.69p1 & 15.73p1), Bedoin Obs. (Dec. 23.90-91p3), and Geisei Obs. (Dec. 27.52p3)
0209P 209P/LINEAR from Chante-Perdrix Obs. (Dec. 28.12-13p3) and PJMSO (Dec. 29.33-34p6 & 30.38p6)
0207P 207P/NEAT from Ageo Obs. (Dec. 20.84p2 & 27.84p2), Schiaparelli Obs. (Dec. 24.24p2), Altamira Obs. (Dec. 26.25-26p2), and Chante-Perdrix Obs. (Dec. 28.22p1)
0205P 205P/Giacobini from Ageo Obs. (Dec. 20.35-36p3), Xingming Obs. (Dec. 25.60-64p4), Altamira Obs. (Dec. 25.91-92p3), Geisei Obs. (Dec. 27.46p1), Moriyama Obs. (Dec. 30.49-50p2), and CAST Obs. (Dec. 30.77p1)
0204P 204P/LINEAR-NEAT from Ageo Obs. (Dec. 20.75-76p2), Borken Obs. (Dec. 28.11p1), Spacewatch 0.9m (Dec. 29.41-44p3), LINEAR (Dec. 30.33-38p5), and CAST Obs. (Dec. 30.94p1)
0203P 203P/Korlevic from Lumezzane Obs. (Dec. 26.78-79p2) and LINEAR (Dec. 30.07-11p4)
0202P 202P/Scotti from Geisei Obs. (Dec. 27.57-58p3), LINEAR (Dec. 29.20-25p5), and Spacewatch 0.9m (Dec. 30.08-11p3)
0200P 200P/Larsen from Bedoin Obs. (Dec. 23.78-80p2) and CAST Obs. (Dec. 30.78p1)
0147P 147P/Kushida-Muramatsu from Ageo Obs. (Dec. 28.62-65p3), Spacewatch 0.9m (Dec. 29.24-27p3), and LINEAR (Dec. 30.28-32p4)
0144P 144P/Kushida from Geisei Obs. (Nov. 24.64p1 & Dec. 15.46p1), Gieres Obs. (Dec. 8.97p1 & 24.92p1), Ageo Obs. (Dec. 20.68-69p3), RAS Mayhill (Dec. 25.11-13p3), Altamira Obs. (Dec. 25.99-03p5), Nazaret Obs. (Dec. 27.84-85p4), Stammersdorf Obs. (Dec. 27.90-92p4), Buchloe Obs. (Dec. 28.76p3 & 30.75-76p3), Chante-Perdrix Obs. (Dec. 28.80-83p3), Linceo Obs. (Dec. 28.88-89p3), Monte Deva Obs. (Dec. 28.99-00p5), PJMSO (Dec. 29.23-24p6 & 30.20-21p6), CAST Obs. (Dec. 29.74p1 & 30.82p1), Wormhout Obs. (Dec. 29.75-80p4), Vicksburg Obs. (Dec. 30.11-12p3), and Moriyama Obs. (Dec. 30.57p2)
0143P 143P/Kowal-Mrkos from Bedoin Obs. (Dec. 24.15-17p3), Altamira Obs. (Dec. 26.15-16p3), Ageo Obs. (Dec. 27.80-81p3), LINEAR (Dec. 28.46-51p4), and CSS (Dec. 29.49-51p4)
0136P 136P/Mueller 3 from Ageo Obs. (Dec. 23.65-66p3) and Chante-Perdrix Obs. (Dec. 28.82-83p2)
0117P 117P/Helin-Roman-Alu 1 from MLS (Dec. 29.21-23p4) and LINEAR (Dec. 30.20-25p5)
0116P 116P/Wild 4 from Vicksburg Obs. (Dec. 30.28-32p3) and CAST Obs. (Dec. 30.97p1)
0077P 77P/Longmore from Bedoin Obs. (Dec. 24.20-21p3), Altamira Obs. (Dec. 26.20-21p4), and Chante-Perdrix Obs. (Dec. 28.17-18p3)
0074P 74P/Smirnova-Chernykh from PJMSO (Dec. 28.34-36p6), Vicksburg Obs. (Dec. 30.35-37p3), and CAST Obs. (Dec. 30.96p1)
0068P 68P/Klemola from Geisei Obs. (Dec. 15.38p1) and Altamira Obs. (Dec. 23.81-82p4)
0067P 67P/Churyumov-Gerasimenko from Hamamatsu-Yuto Obs. (Dec. 28.38-39p3), La Vara Obs. (Dec. 28.80-81p3), Nazaret Obs. (Dec. 28.80-82p4), and CAST Obs. (Dec. 29.72-73p2 & 30.73-74p2)
0065P 65P/Gunn from Bedoin Obs. (Dec. 24.22-24p3), Chante-Perdrix Obs. (Dec. 28.19-20p3), LINEAR (Dec. 29.43-48p3), and PJMSO (Dec. 30.40p4)
0061P 61P/Shajn-Schaldach from Ageo Obs. (Dec. 20.62-63p2), Bedoin Obs. (Dec. 23.83-84p3), La Dehesilla Obs. (Dec. 26.92-93p3), LINEAR (Dec. 29.19-24p4), Vicksburg Obs. (Dec. 30.17-20p3), and CAST Obs. (Dec. 30.80p1)
0059P 59P/Kearns-Kwee from Ageo Obs. (Dec. 20.59-60p3), Monte Deva Obs. (Dec. 28.96-97p5), PJMSO (Dec. 29.22-23p6 & 30.17-18p6), and CAST Obs. (Dec. 30.80p1)
0051P 51P/Harrington from Ageo Obs. (Dec. 20.71p2), PJMSO (Dec. 30.24-25p6), and Moriyama Obs. (Dec. 30.59-60p2)
0044P 44P/Reinmuth 2 from Bedoin Obs. (Dec. 23.88-89p3), Altamira Obs. (Dec. 26.05-08p5), PJMSO (Dec. 30.26-27p6), and CAST Obs. (Dec. 30.82p1)
0033P 33P/Daniel from Geisei Obs. (Dec. 7.77p1) and Schiaparelli Obs. (Dec. 22.08p1 & 22.22p1)
0029P 29P/Schwassmann-Wachmann 1 from Geisei Obs. (Dec. 7.72p1, 9.76p1, 23.73p1 & 27.68p1), Gualba Obs. (Dec. 21.85-86p4 & 22.18-19p2), Remanzacco Obs. (Dec. 21.97p1), Altamira Obs. (Dec. 26.11-14p4), Stammersdorf Obs. (Dec. 27.94-96p4), Chante-Perdrix Obs. (Dec. 28.05p1, 28.13-14p2 & 29.03p1), Borken Obs. (Dec. 28.13-14p2), Nazaret Obs. (Dec. 28.18-19p4 & 29.11p3), La Vara Obs. (Dec. 28.83p3), Linceo Obs. (Dec. 29.04-06p3), Monte Deva Obs. (Dec. 29.05-06p5), Wormhout Obs. (Dec. 29.07p1 & 30.03-06p3), PJMSO (Dec. 29.29-31p5), CAST Obs. (Dec. 29.91p1 & 30.93p1), and Vicksburg Obs. (Dec. 30.24-26p3)
0022P 22P/Kopff from Geisei Obs. (Dec. 9.86p1) and Chante-Perdrix Obs. (Dec. 28.22-24p3)
0019P 19P/Borrelly from Chante-Perdrix Obs. (Dec. 28.16-17p2), Nazaret Obs. (Dec. 28.20-21p4), PJMSO (Dec. 28.45p6 & 30.41p5), Wormhout Obs. (Dec. 30.22-24p2), and CAST Obs. (Dec. 31.01p1)
0015P 15P/Finlay from Lumezzane Obs. (Dec. 27.03-04p2), Chante-Perdrix Obs. (Dec. 28.15-16p2), PJMSO (Dec. 28.31-32p5), and CAST Obs. (Dec. 30.95p1)
0006P 6P/d'Arrest from Geisei Obs. (Dec. 15.44p1), Ageo Obs. (Dec. 20.48p3), RAS Mayhill (Dec. 25.10-13p2), and La Vara Obs. (Dec. 28.79p3)

Observers on 31 December '08

A total of 59 observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`349`	Ageo Obs. in Japan, 16 in MPEC 2008-Y79 -- P/2008 T4, C/2008 R3, P/2008 QP20, C/2007 S2, C/2006 K1, 207P, 205P, 204P, 147P, 144P, 143P, 136P, 61P, 59P, 51P, 6P
`J24`	Altamira Obs. in Spain, 18 in MPEC 2008-Y79 -- C/2008 T2, C/2008 R3, C/2008 P1, C/2008 N1, C/2008 J1, C/2008 FK75, C/2007 Q3, C/2006 W3, C/2006 U6, C/2006 OF2, 207P, 205P, 144P, 143P, 77P, 68P, 44P, 29P
`251`	Arecibo in Puerto Rico, 2 in radar -- 184266, 4660
`H55`	Astronomical Research Obs. (ARO) in Illinois, 24 in MPEC 2008-Y80 -- 2008 YO27, 2008 YN2, 2008 YM27, 2008 YK2, 2008 YJ3, 2008 YG3, 2008 YG26, 2008 YF3, 2008 YE3, 2008 YD29, 2008 XU2, 2008 XM, 2008 XE2, 2008 WL, 2008 WK96, 2008 VH14, 2008 VG14, 2008 VA15, 2008 SV7, 2008 SH82, 2008 QT3, 2008 EV5, 2003 KU2, 2002 CM1
`132`	Bedoin Obs. in France, 10 in MPEC 2008-Y79 -- P/2008 Q2, P/2008 L2, P/2008 J3, C/2006 K1, 200P, 143P, 77P, 65P, 61P, 44P
`B59`	Borken Obs. in Germany, 3 in MPEC 2008-Y79 -- P/2008 QP20, 204P, 29P
`215`	Buchloe Obs. in Germany, 4 in MPEC 2008-Y79 -- P/2008 X1, P/2008 J3, C/2006 W3, 144P
`235`	CAST Obs. in Italy, 18 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YZ28, P/2008 X1, C/2007 U1, C/2006 W3, C/2006 OF2, 205P, 204P, 200P, 144P, 116P, 74P, 67P, 61P, 59P, 44P, 29P, 19P, 15P
`160`	Castelmartini Obs. in Italy, 4 in MPEC 2008-Y80 -- 89355, 162361, 142348, 136849
`703`	Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2008-Y79, 2008-Y80, 2008-Y83 & 2008-Y86 -- 2008 YU30, 2008 YR2, 2008 YO27, 2008 YM27, 2008 YG30, 2008 YG26, 2008 WN2, 2008 TK157, 2002 VY94, 55532, 53319, 8567, 5143, 143P
`A77`	Chante-Perdrix Obs. in France, 15 in MPEC 2008-Y79 -- P/2008 T1, C/2008 N1, C/2008 FK75, C/2007 N3, C/2006 OF2, 209P, 207P, 144P, 136P, 77P, 65P, 29P, 22P, 19P, 15P
`B60`	Deep Sky Obs. in Germany, 2 in MPEC 2008-Y80 -- 20460, 3200
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2008-Y80 -- 2008 SX245, 2008 RG98, 1998 QE2
`113`	Drebach Obs. in Germany, 2 in MPEC 2008-Y80 -- 2008 SQ1, 2008 SH82
`114`	Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-Y85 -- 2008 YT30
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-Y80 -- 2008 YR27
`372`	Geisei Obs. in Japan, 12 in MPEC 2008-Y79 -- P/2008 X1, C/2008 E1, C/2007 N3, C/2006 K1, 205P, 202P, 144P, 68P, 33P, 29P, 22P, 6P
`B83`	Gieres Obs., 4 in MPEC 2008-Y79 -- P/2008 Q2, C/2006 W3, C/2006 OF2, 144P
`253`	Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4660
`J95`	Great Shefford Obs. in England, 4 in MPEC 2008-Y80 -- 2008 YR2, 2008 YQ27, 2008 YG29, 2008 YC3
`E16`	Grove Creek Obs. in New South Wales, 1 in MPEC 2008-Y79 -- C/2008 P1
`442`	Gualba Obs. in Spain, 1 in MPEC 2008-Y79 -- 29P
`A17`	Guidestar Obs. in Germany, 3 in MPEC 2008-Y80 -- 2008 YZ28, 2008 YG29, 2008 YF
`379`	Hamamatsu-Yuto Obs. in Japan, 4 in MPECs 2008-Y79 & 2008-Y80 -- 2008 WL60, 2005 BC, 2004 LV3, 67P
`B15`	Inastars Obs. in Germany, 1 in MPEC 2008-Y80 -- 2008 YE29
`415`	Kambah Obs. in the Australian Capital Territory, 3 in MPEC 2008-Y79 -- C/2008 E1, C/2007 Q3, C/2006 K4
`682`	Kanab Obs. in Utah, 1 in MPEC 2008-Y80 -- 2008 YR27
`704`	LINEAR in New Mexico, 30 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YR2, 2008 YN27, 2008 XB1, P/2008 T4, 2008 SQ1, 2008 QT3, P/2008 Q2, 2008 MB5, P/2008 L2, 2005 NJ1, 2001 LM5, 2001 FX9, 96315, 200840, 200754, 189973, 142348, 5143, 4179, 3360, 2368, 1627, 204P, 203P, 202P, 147P, 143P, 117P, 65P, 61P
`212`	La Dehesilla Obs. in Spain, 2 in MPEC 2008-Y79 -- C/2008 J1, 61P
`J38`	La Vara Obs. in Spain, 6 in MPEC 2008-Y79 -- C/2008 A1, C/2006 W3, C/2006 OF2, 67P, 29P, 6P
`J59`	Linceo Obs. in Spain, 2 in MPEC 2008-Y79 -- 144P, 29P
`130`	Lumezzane Obs. in Italy, 2 in MPEC 2008-Y79 -- 203P, 15P
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2008-Y82, 2008-Y83, 2008-Y84, 2008-Y85 & 2008-Y86 -- 2008 YU30, 2008 YT30, 2008 YH30, 2008 YG30, 2008 YF30
`J98`	Manises Obs., 1 in MPEC 2008-Y79 -- C/2006 OF2
`B67`	Mirasteilas Obs. in Switzerland, 3 in MPEC 2008-Y80 -- 2008 RT26, 2002 XP90, 2368
`J45`	Montana Cabreja Obs. in the Canary Islands, 1 in MPEC 2008-Y79 -- C/2006 OF2
`945`	Monte Deva Obs. in Spain, 6 in MPEC 2008-Y79 -- C/2008 T2, C/2006 W3, C/2006 OF2, 144P, 59P, 29P
`900`	Moriyama Obs. in Japan, 7 in MPEC 2008-Y79 -- P/2008 X1, C/2008 R3, P/2008 QP20, C/2006 W3, 205P, 144P, 51P
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-Y79, 2008-Y80 & 2008-Y82 -- 2008 YF30, C/2008 S3, 2003 XB22, 2003 RB, 2000 WM107, 1999 AJ39, 85990, 154988, 117P
`J47`	Nazaret Obs. in Spain, 8 in MPEC 2008-Y79 -- P/2008 T1, C/2008 S3, P/2008 Q2, C/2006 W3, 144P, 67P, 29P, 19P
`423`	North Ryde Obs. in New South Wales, 5 in MPEC 2008-Y79 -- C/2008 P1, C/2008 E1, C/2007 Q3, C/2006 U6, C/2006 K4
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 28 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YE3, 2008 XE3, 2008 WQ63, 2008 WL60, 2008 VK14, 2008 UC95, 2008 SQ1, 2008 SH82, P/2008 QP20, P/2008 Q2, 2008 MZ, 2008 EV5, C/2006 OF2, 2005 TZ51, 2005 BC, 2004 LV3, 2002 AU4, 1999 AQ10, 209P, 144P, 74P, 65P, 59P, 51P, 44P, 29P, 19P, 15P
`H06`	RAS Obs. Mayhill in New Mexico, 4 in MPEC 2008-Y79 -- C/2007 N3, C/2006 W3, 144P, 6P
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2008-Y79 -- 29P
`461`	SZTE Asteroid Program in Hungary, 1 in MPEC 2008-Y79 -- C/2008 S3
`854`	Sabino Canyon Obs. in Arizona, 2 in MPECs 2008-Y83 & 2008-Y86 -- 2008 YU30, 2008 YG30
`104`	San Marcello Pistoiese Obs. in Italy, 3 in MPEC 2008-Y80 -- 2008 YZ28, 2008 YR27, 2008 YE29
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2008-Y79 -- C/2007 S2
`204`	Schiaparelli Obs. in Italy, 3 in MPEC 2008-Y79 -- P/2008 J3, 207P, 33P
`E12`	Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2008-Y80 -- 53430, 199003, 164400, 1943
`071`	Smolyan Obs. in Bulgaria, 11 in MPECs 2008-Y79 & 2008-Y80 -- 2008 WQ63, 2008 WL60, 2008 UC95, 2008 SQ1, C/2007 U1, 2006 WZ2, C/2006 W3, C/2006 OF2, 2005 TZ51, 2005 BC, 2000 FL1
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2008-Y79, 2008-Y80, 2008-Y81, 2008-Y84 & 2008-Y85 -- 2008 YT30, 2008 YH30, 2008 YE30, 2003 YL, 204P, 202P, 147P
`291`	Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2008-Y80, 2008-Y81, 2008-Y84 & 2008-Y85 -- 2008 YT30, 2008 YH30, 2008 YF29, 2008 YE30, 2008 YE29, 2008 XA2, 2008 WX32, 2008 WL61, 2008 WJ60, 2008 VH14, 2008 VG14, 2008 SJ82, 2007 DK8, 2005 AY28, 2004 RZ164, 154007, 142348
`A97`	Stammersdorf Obs. in Austria, 2 in MPEC 2008-Y79 -- 144P, 29P
`A16`	Tentlingen Obs. in Switzerland, 1 in MPEC 2008-Y80 -- 4183
`H47`	Vicksburg Obs. in Mississippi, 7 in MPECs 2008-Y79 & 2008-Y80 -- C/2006 W3, 1627, 144P, 116P, 74P, 61P, 29P
`A11`	Wormhout Obs. in France, 4 in MPEC 2008-Y79 -- C/2006 OF2, 144P, 29P, 19P
`C42`	Xingming Obs. in China, 1 in MPEC 2008-Y79 -- 205P
`367`	Yatsuka Obs. in Japan, 1 in MPEC 2008-Y79 -- C/2007 N3

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 31 December '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2008 YH30	JPL Sentry	1742	2090-2102	5	3.3e-09	-9.56	-9.95	0	JPL: "Analysis based on 13 observations spanning .17167 days (2008-Dec-31.29293 to 2008-Dec-31.4646)." Diameter approximately 0.014 km. from mean, weighted H=26.8.

2008 YF30	JPL Sentry	1935	2019-2108	66	9.1e-08	-6.76	-7.76	0	JPL: "Analysis based on 12 observations spanning .10763 days (2008-Dec-31.21642 to 2008-Dec-31.32405)." Diameter approximately 0.040 km. from mean, weighted H=24.6.

2008 YF29	JPL Sentry	1420	2013-2106	27	1.0e-06	-5.32	-5.57	0	JPL: "Analysis based on 23 observations spanning .89215 days (2008-Dec-30.24924 to 2008-Dec-31.14139)." Diameter approximately 0.053 km. from mean, weighted H=24.0.
2008 YF29	NEODyS	1420	2013-2090	36	2.92e-06	-4.66	-5.23	0	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/30.250 to 2008/12/31.142."

2008 YE29	JPL Sentry	1420	2033-2106	8	1.5e-08	-5.64	-6.20	0	JPL: "Analysis based on 33 observations spanning .90643 days (2008-Dec-30.22562 to 2008-Dec-31.13205)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
2008 YE29	NEODyS	1420	2069-2081	2	1.44e-09	-6.85	-6.88	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/12/30.226 to 2008/12/31.133."

2008 YA29	NEODyS	1420	2027-2079	10	6.72e-09	-8.05	-8.59	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/12/30.291 to 2008/12/30.412."

2008 YC3	JPL Sentry	1420	2070-2108	27	2.0e-04	-4.34	-4.90	0	JPL: "Analysis based on 26 observations spanning 8.6619 days (2008-Dec-22.25277 to 2008-Dec-30.91466)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2008 YC3	NEODyS	1420	2081-2090	11	6.1e-05	-4.83	-5.26	0	NEODyS: "Based on 30 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/30.915."

2008 XU2	JPL Sentry	1420	2039	1	5.1e-07	-6.41	-6.41	0	JPL: "Analysis based on 37 observations spanning 24.008 days (2008-Dec-06.2616 to 2008-Dec-30.26977)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2008 XU2	NEODyS	1420	R E M O V E D						-

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology on 31 December '08

Times are UTC for when items were noted or added by The Tracking News.

2232	Grabbed MPEC 2008-Y85 - 2008 YT30 - see above Grabbed MPEC 2008-Y86 - 2008 YU30 - see above
1935	Noted that JPL Sentry has posted 2008 YF30 as an impact risk - see above
1742	Noted that JPL Sentry has posted 2008 YH30 as an impact risk - see above
1600	Grabbed MPEC 2008-Y81 - 2008 YE30 - see above Grabbed MPEC 2008-Y82 - 2008 YF30 - see above Grabbed MPEC 2008-Y83 - 2008 YG30 - see above Grabbed MPEC 2008-Y84 - 2008 YH30 - see above
1420	Noted that JPL Sentry has updated its 2008 XU2 risk assessment - see above Noted that NEODyS has removed 2008 XU2 as an impact risk - see above Noted that NEODyS has posted 2008 YA29 as an impact risk - see above Noted that JPL Sentry has updated its 2008 YC3 risk assessment - see above Noted that NEODyS has updated its 2008 YC3 risk assessment - see above Noted that JPL Sentry has updated its 2008 YE29 risk assessment - see above Noted that NEODyS has posted 2008 YE29 as an impact risk - see above Noted that JPL Sentry has updated its 2008 YF29 risk assessment - see above Noted that NEODyS has posted 2008 YF29 as an impact risk - see above Grabbed MPEC 2008-Y80 - Daily Orbit Update - see above
0558	Grabbed MPEC 2008-Y79 - Observations of Comets - see above
0059	Noted Radar Astrometry database update - see above

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