2009-01-03 Tracking News

Contents on 3 January '09

IAU Minor Planet Center
- NEOCP Activity -- two listings: 1 new, 1 updated
- New MPECs -- ten MPECs
Observers -- 23 observing facilities
Impact Risk Monitoring -- ten 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.

NEOCP Activity on 3 January '09

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." So far The Tracking News has counted a total of seven objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs on 3 January '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been ten MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-A20 time-stamped "00:17 UT" - 2006 VA3 - see below
MPEC 2009-A21 time-stamped "05:02 UT" - 2008 QY40 - see below
MPEC 2009-A22 time-stamped "07:09 UT" - Daily Orbit Update - see below
MPEC 2009-A23 time-stamped "13:15 UT" - 2008 RE80 - see below
MPEC 2009-A24 time-stamped "14:50 UT" - 2009 AS - see below
MPEC 2009-A25 time-stamped "14:58 UT" - 2009 AT - see below
MPEC 2009-A26 time-stamped "15:01 UT" - 2009 AU - see below
MPEC 2009-A27 time-stamped "15:04 UT" - 2009 AV - see below
MPEC 2009-A28 time-stamped "15:47 UT" - 1993 VC - see below
MPEC 2009-A29 time-stamped "16:05 UT" - 2008 WQ63

MPEC 2009-A29 - "16:05 UT" - 2008 WQ63

K08W63Q 2008 WQ63 (Earth MOID=3.2 LD, H=20.1 ~323m) from NEAT's Mt. Palomar telescope (2002 July 18.26p1, 2002 July 18.33-34p2, 2002 July 18.40-41p2 & 2002 Aug. 8.23-27p3)

MPEC 2009-A28 - "15:47 UT" - 1993 VC

J93V00C 1993 VC (Q=4.253 AU, H=20.5 ~269m) from the Mt. Lemmon Survey (MLS) (2007 Nov. 4.44-47p4 & 2007 Nov. 11.46-48p4)

MPEC 2009-A27 - "15:04 UT" - 2009 AV

K09A00V 2009 AV (risk-listed, i=42.0°, Q=0.963 AU, H=18.1 ~812m) was discovered at 1258 UT on 2 Jan. by MLS, which observed it at Jan. 2.54-55p4 and 3.52-54p4. The discovery was confirmed by Great Shefford Obs. (Jan. 3.22p2).

MPEC 2009-A26 - "15:01 UT" - 2009 AU

K09A00U 2009 AU (H=20.8 ~234m) was discovered at 0732 UT on 2 Jan. by MLS, which observed it at Jan. 2.31-34p4 at V=21.5-22.4 and 2.38-41p4 at V=20.8-21.9. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Jan. 2.37-38p4 & 3.21-24p3) and Great Shefford Obs. (Jan. 2.96-98p3).

MPEC 2009-A25 - "14:58 UT" - 2009 AT

K09A00T 2009 AT (Q=6.688 AU, H=21.0 ~214m) was discovered at 0633 UT on 2 Jan. by the Catalina Sky Survey (CSS), which observed it at Jan. 2.27-29p4, 2.35p4, 2.43-44p4, and 3.22p3. The discovery was confirmed by Great Shefford Obs. (Jan. 2.95p3), Sandlot Obs. (Jan. 3.17-18p3), MRO (Jan. 3.18-20p5), Desert Moon Obs. (Jan. 3.20-24p3), and Astronomical Research Obs. (ARO) (Jan. 3.27p3).

MPEC 2009-A24 - "14:50 UT" - 2009 AS

K09A00S 2009 AS (H=18.0 ~851m) was discovered at 1240 UT on 1 Jan. by MLS, which observed it at Jan. 1.53-54p4 and 3.55-56p2. The discovery was confirmed by the Spacewatch 1.8m telescope (Jan. 2.55-56p3).

MPEC 2009-A23 - "13:15 UT" - 2008 RE80

K08R80E 2008 RE80 (H=18.2 ~776m) from NEAT/Palomar (2001 Oct. 28.41-42p2)

<< DOU on 3 Jan. '09 >> MPEC 2009-A22 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K09A00L 2009 AL (Q=4.088 AU, arc=2 days, H=21.7 ~155m) from Spacewatch 1.8m (Jan. 3.07-08p3 at V=22.3) and MRO (Jan. 3.16-17p3)
K08Y32Y 2008 YY32 (small asteroid, arc=3 days, H=25.2 ~31m) from Great Shefford Obs. (Jan. 3.07p3)
K08Y32V 2008 YV32 (small asteroid, arc=3 days, H=26.1 ~20m) from Great Shefford Obs. (Jan. 2.89-91p3) and Spacewatch 1.8m (Jan. 3.14-15p2)
K08Y32U 2008 YU32 (arc=3 days, H=19.8 ~371m) from MRO (Jan. 3.14-15p3)
K08Y30U 2008 YU30 (small asteroid, arc=2 days, H=23.2 ~78m) from Spacewatch 1.8m (Jan. 2.53-54p3)
K08Y30T 2008 YT30 (arc=3 days, H=19.3 ~467m) from Spacewatch 1.8m (Jan. 2.32-33p2 & 3.09-10p3)
K08Y29F 2008 YF29 (small asteroid, arc=4 days, H=24.1 ~51m) from Spacewatch 1.8m (Jan. 2.35-36p3) and Great Shefford Obs. (Jan. 2.91-92p3)
K08Y29E 2008 YE29 (Q=4.517 AU, arc=4 days, H=20.2 ~309m) from Spacewatch 1.8m (Jan. 2.22-23p3 & 3.17-18p3)
K08Y03C 2008 YC3 (small asteroid, arc=12 days, H=25.4 ~28m) from MRO (Jan. 3.12-13p3)
Observations of recently (no longer) risk-listed objects
K08Y30H 2008 YH30 (small asteroid, arc=3 days, H=26.8 ~15m) from Great Shefford Obs. (Jan. 3.04-06p2)
K08Y30F 2008 YF30 (small asteroid, arc=2 days, H=24.5 ~43m) from Spacewatch 1.8m (Jan. 2.28-29p2)
K08Y29B 2008 YB29 (small asteroid, arc=4 days, H=25.7 ~25m) from Great Shefford Obs. (Jan. 3.16-17p3)
K08Y29A 2008 YA29 (small asteroid, arc=2 days, H=24.9 ~35m) from ARO (Jan. 1.35-37p3)
K08Y03J 2008 YJ3 (arc=12 days, H=20.2 ~309m) from Spacewatch 1.8m (Jan. 2.21p3 & 3.19-20p3)
K08X02O 2008 XO2 (arc=28 days, H=18.6 ~645m) from Spacewatch 1.8m (Jan. 2.26-27p3 at V=21.9-22.5)
Observations of small asteroids (H>22.0)
K08Y30G 2008 YG30 (arc=3 days, H=24.6 ~41m) from Great Shefford Obs. (Jan. 3.06-07p3)
K08Y29G 2008 YG29 (arc=2 days, H=24.0 ~54m) from Starkenburg Obs. (Dec. 30.84-86p3)
K08Y27N 2008 YN27 (arc=4 days, H=22.1 ~129m) from Lumezzane Obs. (Dec. 30.91-92p4) and Petit Jean Mtn. South Obs. (PJMSO) (Jan. 2.31p6)
K08Y02M 2008 YM2 (arc=13 days, H=24.0 ~54m) from Spacewatch 1.8m (Jan. 3.21-22p2)
K07U01Y 2007 UY1 (arc=2 opp, H=22.9 ~89m) from PJMSO (Jan. 2.39p5)
Observations of almost-small asteroids (21.7<H<=22.0)
K08Y29D 2008 YD29 (Q=4.584 AU, arc=4 days, H=22.0 ~135m) from Spacewatch 1.8m (Jan. 2.34p3 & 3.10-11p3)
Observations of other objects
K09A00O 2009 AO (i=39.8°, q=0.367 AU, Q=4.889 AU, arc=1 day, H=17.6 ~1.02 km) from Spacewatch 1.8m (Jan. 3.12-13p3)
K09A00K 2009 AK (Q=4.670 AU, arc=2 days, H=19.6 ~407m) from Inastars Obs. (Jan. 2.76-78p4)
K08Y30E 2008 YE30 (Q=4.131 AU, arc=12 days, H=21.0 ~214m) from Great Shefford Obs. (Jan. 3.08p2)
K08Y27S 2008 YS27 (arc=5 days, H=21.2 ~195m) from Desert Moon Obs. (Jan. 2.46-50p3) and Great Shefford Obs. (Jan. 3.17-19p3)
K08Y27O 2008 YO27 (i=40.5°, arc=3 days, H=20.8 ~234m) from Lumezzane Obs. (Dec. 30.93-94p4)
K08Y26G 2008 YG26 (arc=4 days, H=21.6 ~162m) from Lumezzane Obs. (Dec. 30.84-85p4), Desert Moon Obs. (Jan. 2.22-23p3), and PJMSO (Jan. 2.27-28p7)
K08Y02R 2008 YR2 (arc=12 days, H=18.6 ~645m) from Desert Moon Obs. (Jan. 2.40-43p3)
K08Y02K 2008 YK2 (arc=13 days, H=19.6 ~407m) from CSS (Jan. 2.31-34p4), PJMSO (Jan. 2.36p6), and Hamamatsu-Yuto Obs. (Jan. 2.69-74p5)
K08Y00A 2008 YA (Q=4.834 AU, arc=17 days, H=17.9 ~891m) from the Siding Spring Survey (SSS) (Jan. 2.45-46p2)
K08X03E 2008 XE3 (Q=4.045 AU, arc=2 opp, H=16.3 ~1.86 km) from Lumezzane Obs. (Dec. 31.05-06p4) and PJMSO (Jan. 2.37-38p6)
K08X02V 2008 XV2 (arc=27 days, H=20.5 ~269m) from PJMSO (Jan. 2.33-34p4)
K08X02E 2008 XE2 (arc=29 days, H=19.3 ~467m) from PJMSO (Jan. 2.42p6)
K08W60L 2008 WL60 (arc=40 days, H=18.2 ~776m) from Hamamatsu-Yuto Obs. (Jan. 2.64-69p11)
K08U90L 2008 UL90 (IEO, Q=0.959 AU, arc=69 days, H=18.5 ~676m) from Great Shefford Obs. (Jan. 3.24-26p2)
K08S82H 2008 SH82 (arc=99 days, H=21.4 ~178m) from PJMSO (Jan. 2.26-27p6), Hamamatsu-Yuto Obs. (Jan. 2.52-53p4 & 2.59p1), and Thompsonville Obs. (Jan. 3.10p6)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.5 ~676m) from PJMSO (Jan. 2.26p6)
K08R26T 2008 RT26 (arc=117 days, H=19.4 ~446m) from PJMSO (Jan. 2.34-35p6)
K08L08W 2008 LW8 (arc=3 opp, H=17.4 ~1.12 km) from Lumezzane Obs. (Dec. 30.96-97p2)
K08E05V 2008 EV5 (arc=2 opp, H=20.0 ~339m) from Pinsoro Obs. (Dec. 21.25p5), PJMSO (Jan. 2.36-37p6), Hamamatsu-Yuto Obs. (Jan. 2.47-51p20), Nazaret Obs. (Jan. 2.87-91p2, 2.95p1, 3.00p1, 3.08p1 & 3.14p1), Montcabre Obs. (Jan. 2.98-99p3), and Atlante Obs. (Jan. 3.01-02p3)
K07Y00Z 2007 YZ (arc=2 opp, H=19.6 ~407m) from MLS (Jan. 2.20-23p4)
K05Y00S 2005 YS (q=0.320 AU, arc=2 opp, H=19.6 ~407m) from Lumezzane Obs. (Dec. 30.81p3)
K05B00C 2005 BC (arc=2 opp, H=18.0 ~851m) from Hamamatsu-Yuto Obs. (Jan. 2.75-77p7)
K04L03V 2004 LV3 (arc=2 opp, H=18.9 ~562m) from Lumezzane Obs. (Dec. 30.80p4) and Hamamatsu-Yuto Obs. (Jan. 2.44-45p6)
K03X22B 2003 XB22 (arc=3 opp, H=19.2 ~490m) from MLS (Jan. 2.46-49p4)
K03N04O 2003 NO4 (arc=3 opp, H=18.1 ~812m) from Spacewatch 1.8m (Jan. 2.38-39p3)
K02V94Y 2002 VY94 (Q=5.375 AU, arc=2 opp, H=16.8 ~1.48 km) from PJMSO (Jan. 2.25-26p5)
K02A04U 2002 AU4 (arc=4 opp, H=19.0 ~537m) from Lumezzane Obs. (Dec. 30.81-82p4)
K01F09X 2001 FX9 (arc=4 opp, H=18.7 ~616m) from PJMSO (Jan. 2.38-39p5)
K2435 202435 2005 XH8 from Lumezzane Obs. (Dec. 30.97-98p4)
G2900 162900 2001 HG31 from Atlante Obs. (Jan. 2.90-91p3), Mt. Tuffley Obs. (Jan. 3.02p3), and Thompsonville Obs. (Jan. 3.05-06p6)
G2385 162385 2000 BM19 from CSS (Jan. 2.54-55p3)
F9923 159923 2004 YJ32 from MLS (Jan. 2.50-52p4)
F4715 154715 2004 LB6 from Lumezzane Obs. (Dec. 31.06-07p4)
F3953 153953 2002 AD9 from Desert Moon Obs. (Jan. 2.53-54p5)
E1052 141052 2001 XR1 from Lumezzane Obs. (Dec. 31.07-08p4) and Atlante Obs. (Jan. 2.99-00p3)
D6849 136849 1998 CS1 from Mt. Tuffley Obs. (Jan. 2.99p3)
96315 96315 1997 AP10 from MLS (Jan. 2.39-41p4)
89355 89355 2001 VS78 from Mt. Tuffley Obs. (Jan. 3.04p3) and Thompsonville Obs. (Jan. 3.09p6)
53319 53319 1999 JM8 from Lumezzane Obs. (Dec. 30.84p2)
35107 35107 1991 VH from Thompsonville Obs. (Jan. 3.08p6)
12711 12711 Tukmit (1991 BB) from Mt. Tuffley Obs. (Jan. 3.01p3)
08567 8567 1996 HW1 from Thompsonville Obs. (Jan. 3.06-07p6)
04179 4179 Toutatis (1989 AC) from Mt. Tuffley Obs. (Jan. 2.97p3)
01627 1627 Ivar (1929 SH) from Mt. Tuffley Obs. (Jan. 2.98p3)

MPEC 2009-A21 - "05:02 UT" - 2008 QY40

K08Q40Y 2008 QY40 (q=36.872 AU, Q=87.726 AU, H=5.4 ~282 km) was discovered at 0908 UT on 25 Aug. 2008 from Mt. Palomar, where it was observed at 2008 Aug. 25.38-42p2, 2008 Aug. 26.35-38p2, 2008 Sept. 25.26p1, 2008 Sept. 25.36p1, 2008 Sept. 26.26p1, and 2008 Sept. 26.36p1. The discovery was confirmed by Cerro Tololo Inter-American Obs. (CTIO) (2008 Oct. 20.04p1, 2008 Oct. 20.14p1, Nov. 30.03p1 & 30.16p1).

MPEC 2009-A20 - "00:17 UT" - 2006 VA3

K06V03A 2006 VA3 (i=53.3°, H=17.2 ~1.23 km) from SSS (Jan. 1.74p4 & 2.74-75p2)

Observers on 3 January '09

A total of 23 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2009-A22 & 2009-A25 -- 2009 AT, 2008 YA29
`J51`	Atlante Obs. in the Canary Islands, 3 in MPEC 2009-A22 -- 2008 EV5, 162900, 141052
`703`	Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2009-A22 & 2009-A25 -- 2009 AT, 2008 YK2, 162385
`807`	Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2009-A21 -- 2008 QY40
`448`	Desert Moon Obs. in New Mexico, 5 in MPECs 2009-A22 & 2009-A25 -- 2009 AT, 2008 YS27, 2008 YR2, 2008 YG26, 153953
`J95`	Great Shefford Obs. in England, 12 in MPECs 2009-A22, 2009-A25, 2009-A26 & 2009-A27 -- 2009 AV, 2009 AU, 2009 AT, 2008 YY32, 2008 YV32, 2008 YS27, 2008 YH30, 2008 YG30, 2008 YF29, 2008 YE30, 2008 YB29, 2008 UL90
`379`	Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-A22 -- 2008 YK2, 2008 WL60, 2008 SH82, 2008 EV5, 2005 BC, 2004 LV3
`B15`	Inastars Obs. in Germany, 1 in MPEC 2009-A22 -- 2009 AK
`130`	Lumezzane Obs. in Italy, 12 in MPEC 2009-A22 -- 2008 YO27, 2008 YN27, 2008 YG26, 2008 XE3, 2008 LW8, 2005 YS, 2004 LV3, 2002 AU4, 53319, 202435, 154715, 141052
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2009-A22, 2009-A25 & 2009-A26 -- 2009 AU, 2009 AT, 2009 AL, 2008 YU32, 2008 YC3
`213`	Montcabre Obs. in Spain, 1 in MPEC 2009-A22 -- 2008 EV5
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2009-A22, 2009-A24, 2009-A26, 2009-A27 & 2009-A28 -- 2009 AV, 2009 AU, 2009 AS, 2007 YZ, 2003 XB22, 1993 VC, 96315, 159923
`675`	Mt. Palomar in southern California, 1 in MPEC 2009-A21 -- 2008 QY40
`J93`	Mt. Tuffley Obs. in England, 6 in MPEC 2009-A22 -- 89355, 162900, 136849, 12711, 4179, 1627
`644`	NEAT's Mt. Palomar telescope in southern California, 2 in MPECs 2009-A23 & 2009-A29 -- 2008 WQ63, 2008 RE80
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2009-A22 -- 2008 EV5
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2009-A22 -- 2008 YN27, 2008 YK2, 2008 YG26, 2008 XV2, 2008 XE3, 2008 XE2, 2008 SQ1, 2008 SH82, 2008 RT26, 2008 EV5, 2007 UY1, 2002 VY94, 2001 FX9
`J52`	Pinsoro Obs. in Spain, 1 in MPEC 2009-A22 -- 2008 EV5
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2009-A25 -- 2009 AT
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-A20 & 2009-A22 -- 2008 YA, 2006 VA3
`291`	Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2009-A22 & 2009-A24 -- 2009 AS, 2009 AO, 2009 AL, 2008 YV32, 2008 YU30, 2008 YT30, 2008 YM2, 2008 YJ3, 2008 YF30, 2008 YF29, 2008 YE29, 2008 YD29, 2008 XO2, 2003 NO4
`611`	Starkenburg Obs. in Germany, 1 in MPEC 2009-A22 -- 2008 YG29
`H53`	Thompsonville Obs. in Illinois, 5 in MPEC 2009-A22 -- 2008 SH82, 89355, 35107, 162900, 8567

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

Impact Risk Monitoring on 3 January '09

**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

2009 AV	JPL Sentry	1859	2010-2106	209	1.1e-07	-2.45	-2.59	0	JPL: "Analysis based on 10 observations spanning .99743 days (2009-Jan-02.54066 to 2009-Jan-03.53809)." Diameter approximately 0.905 km. from mean, weighted H=17.9.

2009 AL	JPL Sentry	1556	2049-2106	8	4.8e-07	-4.81	-5.08	0	JPL: "Analysis based on 25 observations spanning 1.8705 days (2009-Jan-01.29931 to 2009-Jan-03.16982)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
2009 AL	NEODyS	1556	2053-2057	2	1.63e-07	-5.05	-5.05	0	NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/01/01.300 to 2009/01/03.171."

2008 YY32	JPL Sentry	1556	2079	1	2.6e-10	-9.89	-9.89	0	JPL: "Analysis based on 40 observations spanning 2.6466 days (2008-Dec-31.42442 to 2009-Jan-03.071047)." Diameter approximately 0.030 km. from mean, weighted H=25.2.

2008 YV32	JPL Sentry	1556	2085-2107	10	7.0e-06	-6.06	-6.65	0	JPL: "Analysis based on 30 observations spanning 2.9281 days (2008-Dec-31.22029 to 2009-Jan-03.14842)." Diameter approximately 0.019 km. from mean, weighted H=26.2.
2008 YV32	NEODyS	1556	2072-2090	5	1.47e-06	-6.68	-6.96	0	NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2008/12/31.221 to 2009/01/03.149."

2008 YU32	JPL Sentry	1556	2013-2103	57	4.2e-07	-3.26	-3.70	0	JPL: "Analysis based on 19 observations spanning 3.0513 days (2008-Dec-31.10188 to 2009-Jan-03.15316)." Diameter approximately 0.373 km. from mean, weighted H=19.8.
2008 YU32	NEODyS	1556	2013-2088	48	2.56e-07	-3.37	-3.79	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/12/31.103 to 2009/01/03.154."

2008 YU30	JPL Sentry	1556	R E M O V E D						JPL: Risk listing removed at 1138 UTC.
2008 YU30	NEODyS	1556	R E M O V E D						-

2008 YT30	JPL Sentry	1556	2015	1	1.3e-10	-6.42	-6.42	0	JPL: "Analysis based on 30 observations spanning 3.0071 days (2008-Dec-31.09054 to 2009-Jan-03.09763)." Diameter approximately 0.430 km. from mean, weighted H=19.5.
2008 YT30	NEODyS	1556	R E M O V E D						-

2008 YF29	JPL Sentry	1556	2032-2102	2	1.7e-09	-8.28	-8.35	0	JPL: "Analysis based on 36 observations spanning 3.6683 days (2008-Dec-30.24924 to 2009-Jan-02.91757)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
2008 YF29	NEODyS	1556	2028-2059	2	7.89e-09	-7.40	-7.46	0	NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2008/12/30.250 to 2009/01/02.918."

2008 YE29	JPL Sentry	1556	R E M O V E D						JPL: Risk listing removed at 1129 UTC.
2008 YE29	NEODyS	1556	R E M O V E D						-

2008 YC3	JPL Sentry	1556	2088-2107	19	2.0e-04	-4.32	-4.87	0	JPL: "Analysis based on 29 observations spanning 11.879 days (2008-Dec-22.25277 to 2009-Jan-03.13185)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2008 YC3	NEODyS	1556	2084-2090	11	6.31e-05	-4.79	-5.22	0	NEODyS: "Based on 33 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2009/01/03.133."

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 3 January '09

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

1859	Noted that JPL Sentry has posted 2009 AV as an impact risk - see above
1638	Grabbed MPEC 2009-A29 - 2008 WQ63 - see above
1556	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 removed 2008 YE29 as an impact risk - see above Noted that NEODyS has removed 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 updated its 2008 YF29 risk assessment - see above Noted that JPL Sentry has updated its 2008 YT30 risk assessment - see above Noted that NEODyS has removed 2008 YT30 as an impact risk - see above Noted that JPL Sentry has removed 2008 YU30 as an impact risk - see above Noted that NEODyS has removed 2008 YU30 as an impact risk - see above Noted that JPL Sentry has updated its 2008 YU32 risk assessment - see above Noted that NEODyS has posted 2008 YU32 as an impact risk - see above Noted that JPL Sentry has updated its 2008 YV32 risk assessment - see above Noted that NEODyS has posted 2008 YV32 as an impact risk - see above Noted that JPL Sentry has updated its 2008 YY32 risk assessment - see above Noted that JPL Sentry has updated its 2009 AL risk assessment - see above Noted that NEODyS has posted 2009 AL as an impact risk - see above Grabbed MPEC 2009-A22 - Daily Orbit Update - see above Grabbed MPEC 2009-A23 - 2008 RE80 - see above Grabbed MPEC 2009-A24 - 2009 AS - see above Grabbed MPEC 2009-A25 - 2009 AT - see above Grabbed MPEC 2009-A26 - 2009 AU - see above Grabbed MPEC 2009-A27 - 2009 AV - see above Grabbed MPEC 2009-A28 - 1993 VC - see above
0614	Grabbed MPEC 2009-A21 - 2008 QY40 - see above
0020	Grabbed MPEC 2009-A20 - 2006 VA3 - see above

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