2008-02-29 Tracking News

Contents on 29 February '08

IAU Minor Planet Center
- NEOCP Activity -- 17 listings: 4 new, 13 updated
- New MPECs -- eight MPECs
- Observers -- 21 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.

NEOCP Activity on 29 February '08

The MPC's NEO Confirmation Page has 17 listings: 4 new, 13 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and thirteen updated listings. All of these were "one nighters." So far The Tracking News has counted a total of 28 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 29 February '08

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been eight MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-D54 time-stamped "03:35 UT" - Comet P/2007 R1 (Larson) - see below
MPEC 2008-D55 time-stamped "07:08 UT" - Daily Orbit Update - see below
MPEC 2008-D56 time-stamped "14:16 UT" - 2008 DF5 - see below
MPEC 2008-D57 time-stamped "14:19 UT" - 2008 DG5 - see below
MPEC 2008-D58 time-stamped "14:21 UT" - 2008 DH5 - see below
MPEC 2008-D59 time-stamped "14:25 UT" - 2008 DJ5 - see below
MPEC 2008-D60 time-stamped "14:27 UT" - 2008 DK5 - see below
MPEC 2008-D61 time-stamped "14:29 UT" - 2008 DL5

MPEC 2008-D61 - "14:29 UT" - 2008 DL5

K08D05L 2008 DL5 (H=21.7 ~155m) was discovered at 1135 UT on 28 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 28.48-51p4. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (Feb. 28.53-54p4), Great Shefford Obs. (Feb. 29.17-19p4), Grasslands Obs. (Feb. 29.31p2), and Jim Young via Table Mtn. Obs. (Feb. 29.42-44p4).

MPEC 2008-D60 - "14:27 UT" - 2008 DK5

K08D05K 2008 DK5 (risk-listed, Earth MOID=3.5 LD, H=21.1 ~204m) was discovered at 1132 UT on 28 Feb. by CSS, which observed it at Feb. 28.48-50p4. The discovery was confirmed by MLS (Feb. 28.53-54p4) and Young/Table Mtn. (Feb. 29.45-46p4).

MPEC 2008-D59 - "14:25 UT" - 2008 DJ5

K08D05J 2008 DJ5 (risk-listed, H=19.5 ~426m) was discovered at 0942 UT on 28 Feb. by MLS, which observed it at Feb. 28.40-45p8 and 29.42-45p4.

MPEC 2008-D58 - "14:21 UT" - 2008 DH5

K08D05H 2008 DH5 (small asteroid, Earth MOID=4.6 LD, H=24.2 ~49m) was discovered at 0846 UT on 28 Feb. by CSS, which observed it at Feb. 28.37-45p12. The discovery was confirmed by Great Shefford Obs. (Feb. 29.12p3), Grasslands Obs. (Feb. 29.24p2), Young/Table Mtn. (Feb. 29.37-39p4), and MLS (Feb. 29.40-42p4). This object will be coming within ten lunar distances (LD) of Earth, reaching 7.2 LD on 5 March.

MPEC 2008-D57 - "14:19 UT" - 2008 DG5

K08D05G 2008 DG5 (risk-listed, Earth MOID=9.2 LD, H=19.6 ~407m) was discovered at 0640 UT on 28 Feb. by CSS, which observed it at Feb. 28.28-30p4 and 28.37-39p4. The discovery was confirmed by the Spacewatch 1.8m telescope (Feb. 29.22-24p3) and MLS (Feb. 29.32-34p4).

MPEC 2008-D56 - "14:16 UT" - 2008 DF5

K08D05F 2008 DF5 (small asteroid, i=41.9°, H=23.5 ~68m) was discovered at 0632 UT on 28 Feb. by LINEAR, which observed it at Feb. 28.27-31p4. The discovery was confirmed by Great Shefford Obs. (Feb. 29.08p3), Heath Rhoades via Table Mtn. Obs. (Feb. 29.14-15p5), Grasslands Obs. (Feb. 29.21p3), MLS (Feb. 29.24-25p4), and Young/Table Mtn. (Feb. 29.27-29p4).

<< DOU on 29 Feb. '08 >> MPEC 2008-D55 - "07:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08D04G 2008 DG4 (small asteroid, Q=4.157 AU, arc=1 day, H=23.6 ~65m) from Greiner Research Obs. (Feb. 28.36-39p3)
K08D04A 2008 DA4 (small asteroid, arc=1 day, H=24.0 ~54m) from Spacewatch 1.8m (Feb. 28.21-22p3)
K08D00B 2008 DB (small asteroid, arc=10 days, H=25.6 ~26m) from Spacewatch 1.8m (Feb. 28.19-20p3)
K08CB6L 2008 CL116 (Q=5.335 AU, arc=18 days, H=20.3 ~295m) from Spacewatch 1.8m (Feb. 28.40-41p3)
Observations of recently (no longer) risk-listed objects
K08D00J 2008 DJ (arc=3 days, H=20.5 ~269m) from Spacewatch 1.8m (Feb. 28.15-16p3), Petit Jean Mtn. South Obs. (PJMSO) (Feb. 28.25-26p7), and Greiner Research Obs. (Feb. 28.34-35p3)
K08CB8R 2008 CR118 (arc=18 days, H=18.7 ~616m) from MLS (Feb. 28.22-24p4) and Desert Moon Obs. (Feb. 28.24-28p3)
K08C22D 2008 CD22 (small asteroid, arc=19 days, H=22.2 ~123m) from PJMSO (Feb. 28.32-33p6) and CSS (Feb. 28.34-36p4)
K08B18T 2008 BT18 (arc=28 days, H=18.4 ~708m) from CSS (Feb. 27.18-20p4) and PJMSO (Feb. 28.26-27p6)
Observations of small asteroids (H>22.0)
K08D04L 2008 DL4 (arc=1 day, H=27.0 ~13m) from LINEAR (Feb. 28.40-43p4)
K08A33L 2008 AL33 (arc=44 days, H=22.7 ~98m) from the Spacewatch 0.9m telescope (Feb. 28.15-20p3)
K02V91X 2002 VX91 (arc=3 opp, H=24.3 ~47m) from Spacewatch 1.8m (Feb. 28.28-29p2)
Observations of almost-small asteroids (21.7<H<=22.0)
K08C01H 2008 CH1 (arc=26 days, H=21.8 ~148m) from Spacewatch 1.8m (Feb. 28.35-36p2)
Observations of other objects
K08D00W 2008 DW (arc=2 days, H=21.6 ~162m) from Spacewatch 1.8m (Feb. 28.29-31p3)
K08D00D 2008 DD (arc=10 days, H=20.4 ~282m) from Greiner Research Obs. (Feb. 28.38p3) and Desert Moon Obs. (Feb. 28.49-50p3)
K08D00C 2008 DC (arc=10 days, H=20.0 ~339m) from MLS (Feb. 28.29-32p4 & 28.36-37p4) and Desert Moon Obs. (Feb. 28.31-33p3)
K08CB6S 2008 CS116 (Q=4.557 AU, arc=108 days, H=20.8 ~234m) from Spacewatch 0.9m (Feb. 28.34-37p3), Desert Moon Obs. (Feb. 28.42-44p3), and LINEAR (Feb. 28.46-49p4)
K08CB6R 2008 CR116 (arc=17 days, H=20.5 ~269m) from Desert Moon Obs. (Feb. 28.19p4), University Hills Obs. (Feb. 28.33-34p6), and Hamamatsu-Yuto Obs. (Feb. 28.66-70p3)
K08CB6J 2008 CJ116 (arc=18 days, H=19.4 ~446m) from Spacewatch 1.8m (Feb. 28.38-39p2)
K08C72L 2008 CL72 (arc=25 days, H=19.8 ~371m) from CSS (Feb. 27.28-30p4), Desert Moon Obs. (Feb. 28.21-22p3), PJMSO (Feb. 28.30-31p6), and LINEAR (Feb. 28.33-37p5)
K08C01N 2008 CN1 (arc=26 days, H=20.6 ~257m) from PJMSO (Feb. 28.29p6) and University Hills Obs. (Feb. 28.29-30p6)
K08C01L 2008 CL1 (arc=26 days, H=19.4 ~446m) from University Hills Obs. (Feb. 28.37-40p6), PJMSO (Feb. 28.38p7), Desert Moon Obs. (Feb. 28.41p5), and Hamamatsu-Yuto Obs. (Feb. 28.72-74p8)
K08C00M 2008 CM (i=36.0°, arc=26 days, H=17.0 ~1.35 km) from CSS (Feb. 27.10-12p4) and MLS (Feb. 28.11-12p4)
K08AB0Z 2008 AZ110 (Q=4.029 AU, arc=2 opp, H=18.3 ~741m) from Junk Bond Obs. (Feb. 28.17-24p4)
K07VI4J 2007 VJ184 (arc=108 days, H=21.2 ~195m) from Spacewatch 1.8m (Feb. 28.42-44p3)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.8 ~2.34 km, q=1.271 AU) from Bornheim Obs. (Feb. 2.88-89p3, 7.92-93p4 & 10.98-99p4)
K07T24U 2007 TU24 (arc=140 days, H=20.6 ~257m) from PJMSO (Feb. 28.37p5)
K07T23C 2007 TC23 (Q=4.521 AU, arc=141 days, H=20.5 ~269m) from Young/Table Mtn. (Feb. 28.28-30p4)
K07T08G 2007 TG8 (Q=4.306 AU, arc=168 days, H=18.6 ~645m) from Bornheim Obs. (Feb. 7.90-91p3 & 11.87p4), PJMSO (Feb. 28.33-34p5), University Hills Obs. (Feb. 28.34-36p6), and CSS (Feb. 28.40-41p4)
K07R09V 2007 RV9 (arc=171 days, H=20.2 ~309m) from CSS (Feb. 28.45-48p4) and Desert Moon Obs. (Feb. 28.46-47p3)
K07N04S 2007 NS4 (arc=2 opp, H=19.0 ~537m) from Spacewatch 0.9m (Feb. 28.32-36p3)
K07M20T 2007 MT20 (arc=2 opp, H=18.7 ~616m) from Spacewatch 1.8m (Feb. 28.26-27p3 at V=22.1-2)
K06D62U 2006 DU62 (arc=3 opp, H=18.1 ~812m) from PJMSO (Feb. 28.29-30p5) and University Hills Obs. (Feb. 28.31-32p6)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from Bornheim Obs. (Jan. 22.96-98p4, Feb. 2.82p3 & 6.89-90p5)
K05E70K 2005 EK70 (arc=4 opp, H=17.4 ~1.12 km) from Bornheim Obs. (Feb. 2.86-87p5, 6.95-96p5 & 17.86-87p4), PJMSO (Feb. 28.23-24p6), and Hamamatsu-Yuto Obs. (Feb. 28.49-53p10)
K05E00A 2005 EA (arc=2 opp, H=21.0 ~214m) from CSS (Feb. 27.31p1) and LINEAR (Feb. 28.39-43p5)
K05B02E 2005 BE2 (arc=2 opp, H=18.2 ~776m) from CSS (Feb. 28.34-36p4) and PJMSO (Feb. 28.34-35p5)
K04C02R 2004 CR2 (arc=2 opp, H=19.4 ~446m) from Desert Moon Obs. (Feb. 28.36-39p3)
K03Y94Q 2003 YQ94 (Q=4.293 AU, arc=2 opp, H=17.6 ~1.02 km) from MLS (Feb. 28.13-15p4)
K03G00S 2003 GS (arc=3 opp, H=19.0 ~537m) from Desert Moon Obs. (Feb. 28.12-15p3)
K02T66D 2002 TD66 (arc=4 opp, H=20.3 ~295m) from PJMSO (Feb. 28.28p7) and Hamamatsu-Yuto Obs. (Feb. 28.54-56p4)
K02C26F 2002 CF26 (arc=5 opp, H=17.2 ~1.23 km) from CSS (Feb. 27.28-30p3)
K01M08A 2001 MA8 (arc=4 opp, H=17.6 ~1.02 km) from CSS (Feb. 28.31-33p4)
K01M03R 2001 MR3 (arc=3 opp, H=19.1 ~513m) from Spacewatch 0.9m (Feb. 28.23-25p2)
K00Q69Y 2000 QY69 (arc=4 opp, H=19.8 ~371m) from LINEAR (Feb. 28.33-38p5)
K00DA7P 2000 DP107 (arc=4 opp, H=18.2 ~776m) from MLS (Feb. 28.29-32p4), PJMSO (Feb. 28.31-32p5), and LINEAR (Feb. 28.33-38p5)
K00D08K 2000 DK8 (Q=4.269 AU, arc=3 opp, H=19.2 ~490m) from LINEAR (Feb. 28.10-13p4)
K00C59G 2000 CG59 (arc=5 opp, H=17.6 ~1.02 km) from Spacewatch 0.9m (Feb. 28.27-30p2) and MLS (Feb. 28.41-44p4)
H5921 175921 2000 DM1 from MLS (Feb. 28.25-28p4) and LINEAR (Feb. 28.33-37p5)
H5189 175189 2005 EC224 from Spacewatch 0.9m (Feb. 28.14-19p3)
H4806 174806 2003 XL from LINEAR (Feb. 28.10-15p4)
H0891 170891 2004 TY16 from LINEAR (Feb. 28.16-20p5)
G3693 163693 Atira (2003 CP20) from Desert Moon Obs. (Feb. 28.09-10p5)
G2038 162038 1996 DH from Goodricke-Pigott Obs. (Feb. 27.21-24p3)
F4347 154347 2002 XK4 from Bornheim Obs. (Feb. 2.83-85p3 & 6.93-94p3) and CSS (Feb. 27.21-24p4)
F3591 153591 2001 SN263 from Desert Moon Obs. (Feb. 28.17-18p5)
F2942 152942 2000 FN10 from LINEAR (Feb. 28.28-33p5)
E4922 144922 2005 CK38 from CSS (Feb. 28.18-20p4)
E1432 141432 2002 CQ11 from Spacewatch 0.9m (Feb. 28.33-36p3)
D8205 138205 2000 EZ148 from Lulin Minor Bodies Tracking (LIMIT) (Feb. 27.73-75p3)
D8175 138175 2000 EE104 from CSS (Feb. 28.18-20p4)
D7099 137099 1998 YW3 from MLS (Feb. 28.13-15p4)
D6618 136618 1994 CN2 from MLS (Feb. 28.42-44p3)
90403 90403 2003 YE45 from CSS (Feb. 28.15-17p4)
86067 86067 1999 RM28 from MLS (Feb. 28.48-50p4)
85804 85804 1998 WQ5 from LINEAR (Feb. 28.10-15p5)
22099 22099 2000 EX106 from CSS (Feb. 27.26-27p4)
18736 18736 1998 NU from CSS (Feb. 27.13-15p4) and MLS (Feb. 28.16-17p4)
11398 11398 1998 YP11 from PJMSO (Feb. 28.38-40p5)
09856 9856 1991 EE from Desert Moon Obs. (Feb. 28.51-53p3)
09400 9400 1994 TW1 from Spacewatch 0.9m (Feb. 28.44-48p3) and CSS (Feb. 28.48-50p4)
09162 9162 1987 OA from CSS (Feb. 28.48-50p4)
06456 6456 Golombek (1992 OM) from CSS (Feb. 28.42-44p4)
05131 5131 1990 BG from Bornheim Obs. (Jan. 6.88p2, 22.93-94p4 & Feb. 2.79-80p3)
04954 4954 Eric (1990 SQ) from Bornheim Obs. (Feb. 2.80-81p5 & 7.81-82p5) and LINEAR (Feb. 28.16-21p5)
04450 4450 Pan (1987 SY) from Bornheim Obs. (Feb. 10.91p5 & 11.85-86p5)
03691 3691 Bede (1982 FT) from CSS (Feb. 28.42-50p8) and Spacewatch 0.9m (Feb. 28.44-48p3)
03552 3552 Don Quixote (1983 SA) from CSS (Feb. 27.31-33p4)
03288 3288 Seleucus (1982 DV) from Bornheim Obs. (Feb. 7.82-84p4, 10.89p2 & 11.83-85p4)
01864 1864 Daedalus (1971 FA) from CSS (Feb. 27.43-46p4) and Purple Mtn. Obs. XuYi Station (Feb. 28.83-85p3)
01862 1862 Apollo (1932 HA) from LINEAR (Feb. 28.23-25p3)
01620 1620 Geographos (1951 RA) from Bornheim Obs. (Feb. 17.87-88p5 & 18.91-92p4) and LINEAR (Feb. 28.27-32p5)
01036 1036 Ganymed (1924 TD) from Malaga Obs. (Feb. 27.85-86p5)

MPEC 2008-D54 - "03:35 UT" - Comet P/2007 R1 (Larson)

PK07R010 P/2007 R1 (Larson) (q=4.352 AU, Q=7.694 AU, TP=2007 Aug. 23.76187 TT) from Vega del Thader Obs. (Dec. 9.83p3), MLS (Jan. 19.08-10p4), and Schiaparelli Obs. (Feb. 2.78p1 & 22.77p1)

Observers on 29 February '08

A total of 21 observing facilities appear in today's MPECs.

Code	Observer / observatory
`127`	Bornheim Obs. in Germany, 10 in MPEC 2008-D55 -- 2007 VQ4, 2007 TG8, 2005 TU45, 2005 EK70, 154347, 5131, 4954, 4450, 3288, 1620
`703`	Catalina Sky Survey (CSS) in Arizona, 26 in MPECs 2008-D55, 2008-D57, 2008-D58, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DH5, 2008 DG5, 2008 CM, 2008 CL72, 2008 CD22, 2008 BT18, 2007 TG8, 2007 RV9, 2005 EA, 2005 BE2, 2002 CF26, 2001 MA8, 90403, 22099, 18736, 154347, 144922, 138175, 9400, 9162, 6456, 3691, 3552, 1864
`448`	Desert Moon Obs. in New Mexico, 13 in MPEC 2008-D55 -- 2008 DD, 2008 DC, 2008 CS116, 2008 CR118, 2008 CR116, 2008 CL72, 2008 CL1, 2007 RV9, 2004 CR2, 2003 GS, 163693, 153591, 9856
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-D55 -- 162038
`651`	Grasslands Obs. in Arizona, 3 in MPECs 2008-D56, 2008-D58 & 2008-D61 -- 2008 DL5, 2008 DH5, 2008 DF5
`J95`	Great Shefford Obs. in England, 3 in MPECs 2008-D56, 2008-D58 & 2008-D61 -- 2008 DL5, 2008 DH5, 2008 DF5
`H51`	Greiner Research Obs. in Wisconsin, 3 in MPEC 2008-D55 -- 2008 DJ, 2008 DG4, 2008 DD
`379`	Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2008-D55 -- 2008 CR116, 2008 CL1, 2005 EK70, 2002 TD66
`701`	Junk Bond Obs. in Arizona, 1 in MPEC 2008-D55 -- 2008 AZ110
`704`	LINEAR in New Mexico, 16 in MPECs 2008-D55 & 2008-D56 -- 2008 DL4, 2008 DF5, 2008 CS116, 2008 CL72, 2005 EA, 2000 QY69, 2000 DP107, 2000 DK8, 85804, 175921, 174806, 170891, 152942, 4954, 1862, 1620
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-D55 -- 138205
`J40`	Malaga Obs. in Spain, 1 in MPEC 2008-D55 -- 1036
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2008-D54, 2008-D55, 2008-D56, 2008-D57, 2008-D58, 2008-D59, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DJ5, 2008 DH5, 2008 DG5, 2008 DF5, 2008 DC, 2008 CR118, 2008 CM, P/2007 R1, 2003 YQ94, 2000 DP107, 2000 CG59, 86067, 18736, 175921, 137099, 136618
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2008-D55 -- 2008 DJ, 2008 CN1, 2008 CL72, 2008 CL1, 2008 CD22, 2008 BT18, 2007 TU24, 2007 TG8, 2006 DU62, 2005 EK70, 2005 BE2, 2002 TD66, 2000 DP107, 11398
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-D55 -- 1864
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2008-D54 -- P/2007 R1
`691`	Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2008-D55 -- 2008 CS116, 2008 AL33, 2007 NS4, 2001 MR3, 2000 CG59, 175189, 141432, 9400, 3691
`291`	Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2008-D55 & 2008-D57 -- 2008 DW, 2008 DJ, 2008 DG5, 2008 DB, 2008 DA4, 2008 CL116, 2008 CJ116, 2008 CH1, 2007 VJ184, 2007 MT20, 2002 VX91
`6735`	Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2008-D55, 2008-D56, 2008-D58, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DH5, 2008 DF5, 2007 TC23
`6739`	Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2008-D56 -- 2008 DF5
`G72`	University Hills Obs. in southern California, 5 in MPEC 2008-D55 -- 2008 CR116, 2008 CN1, 2008 CL1, 2007 TG8, 2006 DU62
`J70`	Vega del Thader Obs. in Spain, 1 in MPEC 2008-D54 -- P/2007 R1

Impact Risk Monitoring on 29 February '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2355 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 DK5	JPL Sentry	2208	2011-2107	114	1.3e-07	-4.51	-5.43	0	JPL: "Analysis based on 12 observations spanning .97959 days (2008-Feb-28.48101 to 2008-Feb-29.460602)." Diameter approximately 0.235 km. from mean, weighted H=20.8.

2008 DJ5	JPL Sentry	2208	2013-2097	23	7.7e-09	-5.27	-5.71	0	JPL: "Analysis based on 12 observations spanning 1.0406 days (2008-Feb-28.40456 to 2008-Feb-29.44512)." Diameter approximately 0.380 km. from mean, weighted H=19.7.

2008 DG5	JPL Sentry	2355	2010-2106	278	3.1e-07	-3.50	-4.18	0	JPL: "Analysis based on 15 observations spanning 1.0647 days (2008-Feb-28.2778 to 2008-Feb-29.34249)." Diameter approximately 0.442 km. from mean, weighted H=19.4.

2008 DG4	JPL Sentry	2238	2069-2089	4	1.2e-07	-6.40	-6.69	0	JPL: "Analysis based on 16 observations spanning 1.1589 days (2008-Feb-27.22883 to 2008-Feb-28.38775)." Diameter approximately 0.061 km. from mean, weighted H=23.7.
2008 DG4	NEODyS	1549	2062-2089	4	6.98e-08	-6.63	-6.95	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/02/27.230 to 2008/02/28.389."

2008 DA4	JPL Sentry	2208	2056-2104	9	1.1e-07	-6.52	-6.69	0	JPL: "Analysis based on 19 observations spanning .93863 days (2008-Feb-27.28072 to 2008-Feb-28.21935)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
2008 DA4	NEODyS	1549	2084-2087	5	4.84e-07	-6.06	-6.09	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/02/27.281 to 2008/02/28.220."

2008 DB	NEODyS	1549	2046-2089	22	2.5e-05	-5.01	-5.08	0	NEODyS: "Based on 53 optical observations (of which 2 are rejected as outliers) from 2008/02/18.243 to 2008/02/28.203."
2008 DB	JPL Sentry	1548	2046-2108	24	4.3e-05	-4.78	-4.85	0	JPL: "Analysis based on 52 observations spanning 9.9601 days (2008-Feb-18.242 to 2008-Feb-28.20208)." Diameter approximately 0.025 km. from mean, weighted H=25.7.

2008 CL116	JPL Sentry	2355	2102	1	5.5e-10	-7.04	-7.04	0	JPL: "Analysis based on 70 observations spanning 18.004 days (2008-Feb-10.40671 to 2008-Feb-28.41025)." Diameter approximately 0.290 km. from mean, weighted H=20.3.

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 29 February '08

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

2355	Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above Noted that JPL Sentry has posted 2008 DG5 as an impact risk - see above
2238	Noted that JPL Sentry has updated its 2008 DG4 risk assessment - see above
2208	Noted that JPL Sentry has updated its 2008 DA4 risk assessment - see above Noted that JPL Sentry has posted 2008 DJ5 as an impact risk - see above Noted that JPL Sentry has posted 2008 DK5 as an impact risk - see above
1549	Noted that NEODyS has updated its 2008 DA4 risk assessment - see above Noted that NEODyS has updated its 2008 DB risk assessment - see above Noted that NEODyS has updated its 2008 DG4 risk assessment - see above Grabbed MPEC 2008-D55 - Daily Orbit Update - see above
1548	Noted that JPL Sentry has updated its 2008 DB risk assessment - see above Grabbed MPEC 2008-D56 - 2008 DF5 - see above Grabbed MPEC 2008-D57 - 2008 DG5 - see above Grabbed MPEC 2008-D58 - 2008 DH5 - see above Grabbed MPEC 2008-D59 - 2008 DJ5 - see above Grabbed MPEC 2008-D60 - 2008 DK5 - see above Grabbed MPEC 2008-D61 - 2008 DL5 - see above
0528	Grabbed MPEC 2008-D54 - Comet P/2007 R1 (Larson) - see above

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