2008-03-06 Tracking News

Contents on 6 March '08

IAU Minor Planet Center
- NEOCP Activity -- 17 listings: 4 new, 13 updated
- New MPECs -- seven MPECs
- Observers -- 22 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 6 March '08

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and thirteen updated listings. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 23 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 6 March '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been seven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-E52 time-stamped "07:09 UT" - Daily Orbit Update - see below
MPEC 2008-E53 time-stamped "15:38 UT" - 2008 EL6 - see below
MPEC 2008-E54 time-stamped "15:42 UT" - 2008 EM6 - see below
MPEC 2008-E55 time-stamped "15:46 UT" - 2008 EN6 - see below
MPEC 2008-E56 time-stamped "15:49 UT" - 2008 EO6 - see below
MPEC 2008-E57 time-stamped "15:52 UT" - 2008 EP6 - see below
MPEC 2008-E58 time-stamped "19:11 UT" - Comets C/2008 D1, 2008 D2, 2008 D3, 2008 D4 (STEREO)

MPEC 2008-E58 - "19:11 UT" - Comets C/2008 D1, 2008 D2, 2008 D3, 2008 D4 (STEREO)

CK08D040 C/2008 D4 from SECCHI HI1-A instrument aboard STEREO-A (Feb. 20.93-13p16)
CK08D030 C/2008 D3 from STEREO-A/HI1-A (Feb. 20.29-41p10, 20.49-74p20, 20.79-07p22, 21.13p2, 21.21-35p12, 21.41-52p10 & 21.57-66p8), SECCHI COR2-B instrument aboard STEREO-B (Feb. 21.78-22p80 & 22.28p2), and SECCHI COR2-A instrument aboard STEREO-A (Feb. 21.80p2, 21.84-96p14 & 22.01-11p12)
CK08D020 C/2008 D2 from STEREO-A/HI1-A (Feb. 19.46-79p26)
CK08D010 C/2008 D1 from STEREO-A/HI1-A (Feb. 16.82p2, 16.88-93p6 & 16.99-04p6)

MPEC 2008-E57 - "15:52 UT" - 2008 EP6

K08E06P 2008 EP6 (H=19.3 ~467m) was discovered at 1312 UT on 5 March by the Siding Spring Survey (SSS), which observed it at March 5.55-61p6 and 6.47-48p5. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (March 6.09-10p4) and Mt. John Obs. (March 6.36-37p5).

MPEC 2008-E56 - "15:49 UT" - 2008 EO6

K08E06O 2008 EO6 (H=19.8 ~371m) was discovered at 0923 UT on 5 March by LINEAR, which observed it at March 5.39-44p5. The discovery was confirmed by Dave Balam via 1.8m Plaskett Telescope (1.8m Plaskett) (March 6.41-45p3) and Mt. John Obs. (March 6.61-62p3).

MPEC 2008-E55 - "15:46 UT" - 2008 EN6

K08E06N 2008 EN6 (i=36.0°, H=18.7 ~616m) was discovered at 0855 UT on 5 March by MLS, which observed it at March 5.37-39p4, 5.44-45p4, and 6.25-27p4. The discovery was confirmed by the Spacewatch 1.8m telescope (March 6.24-25p3).

MPEC 2008-E54 - "15:42 UT" - 2008 EM6

K08E06M 2008 EM6 (small asteroid, H=25.7 ~25m) was discovered at 0850 UT on 5 March by MLS, which observed it at March 5.32-39p8, 5.48p3, and 6.25-27p4. The discovery was confirmed by Spacewatch 1.8m (March 6.29-30p3).

MPEC 2008-E53 - "15:38 UT" - 2008 EL6

K08E06L 2008 EL6 (risk-listed, Earth MOID=7.9 LD, H=20.7 ~245m) was discovered at 0236 UT on 5 March by LINEAR, which observed it at March 5.11-14p4. The discovery was confirmed by Mt. John Obs. (March 6.39-40p6 & 6.52-53p4).

<< DOU on 6 Mar. '08 >> MPEC 2008-E52 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K08E05X 2008 EX5 (small asteroid, arc=1 day, H=23.9 ~56m) from McDonald Obs. (March 5.33-34p3)
K08E05V 2008 EV5 (arc=1 day, H=20.0 ~339m) from McDonald Obs. (March 5.10-11p3)
K08E05E 2008 EE5 (i=47.2°, arc=1 day, H=18.9 ~562m) from MLS (March 5.11p4)
K08E01K 2008 EK1 (i=39.2°, arc=2 days, H=20.4 ~282m) from Petit Jean Mtn. South Obs. (PJMSO) (March 5.28-31p8), Spacewatch 1.8m (March 5.31-34p3), Guidestar Obs. (March 5.81-82p3), Lindenberg Obs. (March 5.86p3), and KLENOT (March 5.88p6)
K08E00R 2008 ER (arc=3 days, H=21.3 ~186m) from MLS (March 5.41-43p4)
K08E00H 2008 EH (small asteroid, arc=4 days, H=22.7 ~98m) from MLS (March 5.20-24p4)
K08D22W 2008 DW22 (small asteroid, arc=6 days, H=25.7 ~25m) from MLS (March 5.30-31p4 at V=22.5)
K08D04A 2008 DA4 (small asteroid, arc=8 days, H=23.9 ~56m) from MLS (March 5.29-31p4) and KLENOT (March 5.98p5)
K08A04F 2008 AF4 (arc=55 days, H=19.7 ~389m) from McDonald Obs. (March 5.20-22p3) and Guidestar Obs. (March 5.83-86p3)
Observations of recently (no longer) risk-listed objects
K08D05K 2008 DK5 (arc=6 days, H=21.0 ~214m) from LINEAR (March 5.38-43p5) and Spacewatch 1.8m (March 5.40-42p3)
K08D05G 2008 DG5 (arc=7 days, H=19.7 ~389m) from McDonald Obs. (March 5.23-25p3) and KLENOT (March 5.87-88p6)
K08D04G 2008 DG4 (small asteroid, Q=4.093 AU, arc=7 days, H=23.7 ~62m) from MLS (March 5.34-36p4) and LINEAR (March 5.36-38p3)
K08D00Y 2008 DY (Q=4.342 AU, arc=8 days, H=20.7 ~245m) from McDonald Obs. (March 5.38-39p3)
K08D00J 2008 DJ (arc=9 days, H=20.5 ~269m) from Lumezzane Obs. (March 2.87-88p4), Goodricke-Pigott Obs. (March 4.20-22p3), MLS (March 5.13-14p4), PJMSO (March 5.25-27p6), and KLENOT (March 5.86-87p7)
K08CB9G 2008 CG119 (i=41.3°, arc=21 days, H=19.0 ~537m) from SSS (March 5.41-42p2)
K08CB8R 2008 CR118 (arc=25 days, H=18.7 ~616m) from McDonald Obs. (March 5.31-32p3) and KLENOT (March 5.90-91p6)
K08C22D 2008 CD22 (small asteroid, arc=25 days, H=22.2 ~123m) from PJMSO (March 5.33-35p6)
K08C22B 2008 CB22 (arc=26 days, H=19.7 ~389m) from PJMSO (March 5.41-44p7)
K08B18T 2008 BT18 (arc=32 days, H=18.3 ~741m) from Lumezzane Obs. (March 2.91-92p4)
Observations of small asteroids (H>22.0)
K08E05S 2008 ES5 (arc=2 days, H=24.7 ~39m) from MLS (March 5.27-28p4)
K08E00Q 2008 EQ (arc=3 days, H=24.1 ~51m) from MLS (March 5.53p4)
K08E00P 2008 EP (arc=3 days, H=24.3 ~47m) from PJMSO (March 5.37-38p9)
K08E00L 2008 EL (arc=23 days, H=22.2 ~123m) from PJMSO (March 5.31-32p8), Eschenberg Obs. (March 5.82p7), and KLENOT (March 5.92p6)
K08D05H 2008 DH5 (arc=6 days, H=24.2 ~49m) from MLS (March 5.53p3)
K08D04L 2008 DL4 (arc=7 days, H=26.9 ~14m) from KLENOT (March 5.91-92p4)
K08CB6P 2008 CP116 (arc=80 days, H=23.0 ~85m) from Lumezzane Obs. (March 3.03-04p4)
K03T01M 2003 TM1 (arc=2 opp, H=22.1 ~129m) from McDonald Obs. (March 5.16p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K08D05L 2008 DL5 (arc=6 days, H=21.8 ~148m) from Spacewatch 1.8m (March 5.42-43p3) and MLS (March 5.53-54p4)
Observations of other objects
K08E01J 2008 EJ1 (i=38.6°, arc=3 days, H=15.8 ~2.34 km, q=0.984 AU) from SSS (March 5.70p1)
K08E00J 2008 EJ (i=37.6°, arc=5 days, H=20.2 ~309m) from KLENOT (March 5.93-94p6)
K08E00G 2008 EG (q=0.248 AU, arc=5 days, H=20.0 ~339m) from KLENOT (March 5.89p4)
K08E00E 2008 EE (arc=4 days, H=19.6 ~407m) from McDonald Obs. (March 5.11-13p4)
K08D17G 2008 DG17 (i=40.3°, arc=3 days, H=19.8 ~371m) from Lumezzane Obs. (March 2.81p3)
K08D00W 2008 DW (arc=8 days, H=21.6 ~162m) from LINEAR (March 5.36-38p3) and Spacewatch 1.8m (March 5.37-38p3)
K08D00C 2008 DC (arc=17 days, H=20.0 ~339m) from KLENOT (March 5.89-90p5)
K08CB8Z 2008 CZ118 (arc=22 days, H=18.4 ~708m) from PJMSO (March 5.45-46p8)
K08CB6S 2008 CS116 (Q=4.558 AU, arc=113 days, H=20.8 ~234m) from LINEAR (March 5.39-43p5) and PJMSO (March 5.39-40p5)
K08C72L 2008 CL72 (arc=32 days, H=19.8 ~371m) from McDonald Obs. (March 5.25-26p3) and Lindenberg Obs. (March 5.87p3)
K08C01Q 2008 CQ1 (arc=54 days, H=19.4 ~446m) from Spacewatch 1.8m (March 5.28-30p3 at V=22.4)
K08C01N 2008 CN1 (arc=32 days, H=20.6 ~257m) from PJMSO (March 5.24p6)
K08C01L 2008 CL1 (arc=32 days, H=19.4 ~446m) from LINEAR (March 5.27-32p10), PJMSO (March 5.33p6), MLS (March 5.37-39p4), and Hamamatsu-Yuto Obs. (March 5.68-72p5)
K08A00E 2008 AE (arc=2 opp, H=19.7 ~389m) from PJMSO (March 5.40-41p6)
K07Y00K 2007 YK (arc=2 opp, H=17.6 ~1.02 km) from the Catalina Sky Survey (CSS) (March 5.31-32p4)
K07T24U 2007 TU24 (arc=144 days, H=20.3 ~295m) from LONEOS (March 1.37-45p4) and Lumezzane Obs. (March 3.04-06p4)
K07T08G 2007 TG8 (Q=4.306 AU, arc=175 days, H=18.6 ~645m) from Lindenberg Obs. (March 5.86p5)
K07R19X 2007 RX19 (i=40.4°, arc=171 days, H=18.5 ~676m) from Lumezzane Obs. (March 2.94p4)
K07R09V 2007 RV9 (arc=177 days, H=20.1 ~323m) from the Spacewatch 0.9m telescope (March 5.42-45p3)
K06SD1U 2006 SU131 (arc=2 opp, H=18.7 ~616m) from McDonald Obs. (March 5.27-28p3)
K06D62U 2006 DU62 (arc=3 opp, H=18.0 ~851m) from Lumezzane Obs. (March 2.88-89p4)
K05E70K 2005 EK70 (arc=4 opp, H=17.4 ~1.12 km) from PJMSO (March 5.22-24p6) and Hamamatsu-Yuto Obs. (March 5.49-51p3)
K05E00A 2005 EA (arc=2 opp, H=21.0 ~214m) from Lumezzane Obs. (March 2.00-01p4)
K05B02E 2005 BE2 (arc=2 opp, H=18.2 ~776m) from PJMSO (March 5.32p5)
K04N09C 2004 NC9 (Q=4.193 AU, arc=3 opp, H=17.2 ~1.23 km) from McDonald Obs. (March 5.13-15p3)
K04C02R 2004 CR2 (arc=2 opp, H=19.5 ~426m) from LINEAR (March 5.35-37p3)
K03A01D 2003 AD1 (arc=3 opp, H=18.2 ~776m) from McDonald Obs. (March 5.46-47p3)
K02T66D 2002 TD66 (arc=4 opp, H=20.3 ~295m) from PJMSO (March 5.27-28p8) and Eschenberg Obs. (March 5.77-78p7)
K02R25U 2002 RU25 (arc=3 opp, H=17.4 ~1.12 km) from McDonald Obs. (March 5.35-37p3)
K00DA7P 2000 DP107 (arc=4 opp, H=18.2 ~776m) from Lumezzane Obs. (March 2.98p4) and McDonald Obs. (March 5.29-30p3)
K00D08K 2000 DK8 (Q=4.269 AU, arc=3 opp, H=19.2 ~490m) from Lumezzane Obs. (March 2.89-91p4)
H5921 175921 2000 DM1 from Lumezzane Obs. (March 2.96-98p4) and LINEAR (March 5.28-33p4)
G2422 162422 2000 EV70 from MLS (March 5.51-53p4)
F3591 153591 2001 SN263 from LONEOS (March 1.18-25p4)
E4922 144922 2005 CK38 from CSS (March 5.12-14p4)
D8175 138175 2000 EE104 from MLS (March 5.20-24p4)
D8127 138127 2000 EE14 from Lumezzane Obs. (March 2.82p4)
D7084 137084 1998 XS16 from MLS (March 5.11-12p4)
86819 86819 2000 GK137 from MLS (March 5.32-33p4)
86324 86324 1999 WA2 from LINEAR (March 5.16-20p5)
54686 54686 2001 DU8 from Lumezzane Obs. (March 2.84-85p4)
53789 53789 2000 ED104 from CSS (March 5.41-42p3)
24443 24443 2000 OG from CSS (March 5.35-37p4)
18736 18736 1998 NU from LINEAR (March 5.11-15p5)
11398 11398 1998 YP11 from PJMSO (March 5.39p4)
09856 9856 1991 EE from CSS (March 5.48-51p4)
05836 5836 1993 MF from CSS (March 5.40-43p4)
03908 3908 Nyx (1980 PA) from MLS (March 5.34-37p4)
03691 3691 Bede (1982 FT) from CSS (March 5.41-43p4)
01685 1685 Toro (1948 OA) from Stammersdorf Obs. (March 5.91-94p5)
01620 1620 Geographos (1951 RA) from Sant Cugat del Valles Obs. (March 5.94-95p4) and Stammersdorf Obs. (March 5.00-01p6)

Observers on 6 March '08

A total of 22 observing facilities appear in today's MPECs.

Code	Observer / observatory
`6581`	Dave Balam via 1.8m Plaskett Telescope in British Columbia, 1 in MPEC 2008-E56 -- 2008 EO6
`703`	Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2008-E52 -- 2007 YK, 53789, 24443, 144922, 9856, 5836, 3691
`151`	Eschenberg Obs. in Switzerland, 2 in MPEC 2008-E52 -- 2008 EL, 2002 TD66
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-E52 -- 2008 DJ
`A17`	Guidestar Obs. in Germany, 2 in MPEC 2008-E52 -- 2008 EK1, 2008 AF4
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-E52 -- 2008 CL1, 2005 EK70
`246`	KLENOT in the Czech Republic, 10 in MPEC 2008-E52 -- 2008 EL, 2008 EK1, 2008 EJ, 2008 EG, 2008 DL4, 2008 DJ, 2008 DG5, 2008 DC, 2008 DA4, 2008 CR118
`704`	LINEAR in New Mexico, 11 in MPECs 2008-E52, 2008-E53 & 2008-E56 -- 2008 EO6, 2008 EL6, 2008 DW, 2008 DK5, 2008 DG4, 2008 CS116, 2008 CL1, 2004 CR2, 86324, 18736, 175921
`699`	LONEOS in Arizona, 2 in MPEC 2008-E52 -- 2007 TU24, 153591
`A80`	Lindenberg Obs. in Germany, 3 in MPEC 2008-E52 -- 2008 EK1, 2008 CL72, 2007 TG8
`130`	Lumezzane Obs. in Italy, 13 in MPEC 2008-E52 -- 2008 DJ, 2008 DG17, 2008 CP116, 2008 BT18, 2007 TU24, 2007 RX19, 2006 DU62, 2005 EA, 2000 DP107, 2000 DK8, 54686, 175921, 138127
`711`	McDonald Obs. in Texas, 14 in MPEC 2008-E52 -- 2008 EX5, 2008 EV5, 2008 EE, 2008 DY, 2008 DG5, 2008 CR118, 2008 CL72, 2008 AF4, 2006 SU131, 2004 NC9, 2003 TM1, 2003 AD1, 2002 RU25, 2000 DP107
`474`	Mt. John Obs. in New Zealand, 3 in MPECs 2008-E53, 2008-E56 & 2008-E57 -- 2008 EP6, 2008 EO6, 2008 EL6
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 20 in MPECs 2008-E52, 2008-E54, 2008-E55 & 2008-E57 -- 2008 ES5, 2008 ER, 2008 EQ, 2008 EP6, 2008 EN6, 2008 EM6, 2008 EH, 2008 EE5, 2008 DW22, 2008 DL5, 2008 DJ, 2008 DH5, 2008 DG4, 2008 DA4, 2008 CL1, 86819, 162422, 138175, 137084, 3908
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 15 in MPEC 2008-E52 -- 2008 EP, 2008 EL, 2008 EK1, 2008 DJ, 2008 CZ118, 2008 CS116, 2008 CN1, 2008 CL1, 2008 CD22, 2008 CB22, 2008 AE, 2005 EK70, 2005 BE2, 2002 TD66, 11398
`C491`	SECCHI HI1-A instrument aboard STEREO-A in heliocentric orbit leading Earth, 4 in MPEC 2008-E58 -- C/2008 D4, C/2008 D3, C/2008 D2, C/2008 D1
`C492`	SECCHI COR2-A instrument aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2008-E58 -- C/2008 D3
`C502`	SECCHI COR2-B instrument aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2008-E58 -- C/2008 D3
`B61`	Sant Cugat del Valles Obs., 1 in MPEC 2008-E52 -- 1620
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2008-E52 & 2008-E57 -- 2008 EP6, 2008 EJ1, 2008 CG119
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-E52 -- 2007 RV9
`291`	Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2008-E52, 2008-E54 & 2008-E55 -- 2008 EN6, 2008 EM6, 2008 EK1, 2008 DW, 2008 DL5, 2008 DK5, 2008 CQ1
`A97`	Stammersdorf Obs. in Austria, 2 in MPEC 2008-E52 -- 1685, 1620

Impact Risk Monitoring on 6 March '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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 EL6	JPL Sentry	2333	2082	1	6.9e-09	-6.04	-6.04	0	JPL: "Analysis based on 14 observations spanning 1.4200 days (2008-Mar-05.10843 to 2008-Mar-06.52847)." Diameter approximately 0.290 km. from mean, weighted H=20.4.

2008 EX5	NEODyS	2031	2016-2090	517	4.88e-05	-3.91	-4.92	0	NEODyS: "Based on 18 optical observations (of which 1 are rejected as outliers) from 2008/03/04.396 to 2008/03/05.424."
2008 EX5	JPL Sentry	1857	2010-2107	705	7.0e-05	-3.68	-4.95	0	JPL: "Analysis based on 17 observations spanning 1.0276 days (2008-Mar-04.39523 to 2008-Mar-05.42279)." Diameter approximately 0.055 km. from mean, weighted H=23.9.

2008 EV5	JPL Sentry	2003	2015-2107	324	5.7e-06	-2.76	-3.40	0	JPL: "Analysis based on 17 observations spanning .90313 days (2008-Mar-04.21432 to 2008-Mar-05.11745)." Diameter approximately 0.332 km. from mean, weighted H=20.0.
2008 EV5	NEODyS	1932	2017-2087	26	1.89e-07	-4.23	-4.58	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/03/04.215 to 2008/03/05.118."

2008 EE5	JPL Sentry	2130	2013-2107	373	8.1e-07	-2.75	-3.55	0	JPL: "Analysis based on 15 observations spanning .93949 days (2008-Mar-04.17185 to 2008-Mar-05.11134)." Diameter approximately 0.482 km. from mean, weighted H=19.2.
2008 EE5	NEODyS	1545	2013-2090	54	1.02e-07	-3.55	-4.23	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008/03/04.173 to 2008/03/05.112."

2008 EK1	JPL Sentry	2333	R E M O V E D						JPL: Risk listing removed at 2245 UTC.
2008 EK1	NEODyS	1544	R E M O V E D

2008 ER	NEODyS	1544	R E M O V E D

2008 EH	JPL Sentry	2130	R E M O V E D						JPL: Risk listing removed at 2035 UTC.
2008 EH	NEODyS	1544	R E M O V E D

2008 DW22	JPL Sentry	2333	R E M O V E D						JPL: Risk listing removed at 2322 UTC.

2008 DA4	JPL Sentry	2333	2100	1	1.8e-07	-6.53	-6.53	0	JPL: "Analysis based on 44 observations spanning 7.7031 days (2008-Feb-27.28072 to 2008-Mar-05.98381)." Diameter approximately 0.056 km. from mean, weighted H=23.9.
2008 DA4	NEODyS	1544	R E M O V E D

2008 AF4	JPL Sentry	2333	2078-2100	7	4.0e-05	-2.08	-2.18	1	JPL: "Analysis based on 566 observations spanning 55.459 days (2008-Jan-10.39652 to 2008-Mar-05.85535)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
2008 AF4	NEODyS	2333	2078-2089	2	3.03e-05	-2.18	-2.18	1	NEODyS: "Based on 570 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/03/05.856. NOTE: The Virtual Impactor in 2089/01/09.480 in the table above is rated as Torino Scale 1."

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 6 March '08

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

2333	Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above Noted that NEODyS has updated its 2008 AF4 risk assessment - see above Noted that JPL Sentry has updated its 2008 DA4 risk assessment - see above Noted that JPL Sentry has removed 2008 DW22 as an impact risk - see above Noted that JPL Sentry has removed 2008 EK1 as an impact risk - see above Noted that JPL Sentry has posted 2008 EL6 as an impact risk - see above
2130	Noted that JPL Sentry has updated its 2008 EE5 risk assessment - see above Noted that JPL Sentry has removed 2008 EH as an impact risk - see above
2030	Noted that NEODyS has posted 2008 EX5 as an impact risk - see above Grabbed MPEC 2008-E58 - Comets C/2008 D1, 2008 D2, 2008 D3, 2008 D4 (STEREO) - see above
2003	Noted that JPL Sentry has posted 2008 EV5 as an impact risk - see above
1931	Noted that NEODyS has posted 2008 EV5 as an impact risk - see above
1857	Noted that JPL Sentry has posted 2008 EX5 as an impact risk - see above
1625	Grabbed MPEC 2008-E55 - 2008 EN6 - see above Grabbed MPEC 2008-E56 - 2008 EO6 - see above Grabbed MPEC 2008-E57 - 2008 EP6 - see above
1545	Noted that NEODyS has updated its 2008 EE5 risk assessment - see above Grabbed MPEC 2008-E52 - Daily Orbit Update - see above
1544	Noted that NEODyS has removed 2008 DA4 as an impact risk - see above Noted that NEODyS has removed 2008 EH as an impact risk - see above Noted that NEODyS has removed 2008 EK1 as an impact risk - see above Noted that NEODyS has removed 2008 ER as an impact risk - see above Grabbed MPEC 2008-E53 - 2008 EL6 - see above Grabbed MPEC 2008-E54 - 2008 EM6 - see above

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