2008-02-27 Tracking News

Contents on 27 February '08

IAU Minor Planet Center
- NEOCP Activity -- six listings: 2 new, 4 updated
- New MPECs -- nine MPECs
- Observers -- 20 observing facilities
Impact Risk Monitoring -- six 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 27 February '08

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of fourteen 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 27 February '08

Minor Planet Electronic Circulars

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

MPEC 2008-D40 time-stamped "00:07 UT" - 2007 UM126 - see below
MPEC 2008-D41 time-stamped "03:06 UT" - 2008 BC22 - see below
MPEC 2008-D42 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2008-D43 time-stamped "12:23 UT" - 2008 DV - see below
MPEC 2008-D44 time-stamped "12:26 UT" - 2008 DW - see below
MPEC 2008-D45 time-stamped "12:29 UT" - 2008 DX - see below
MPEC 2008-D46 time-stamped "12:33 UT" - 2008 DY - see below
MPEC 2008-D47 time-stamped "17:56 UT" - 2008 DA4 - see below
MPEC 2008-D48 time-stamped "22:10 UT" - 2007 TK422, 2007 VJ305

MPEC 2008-D48 - "22:10 UT" - 2007 TK422, 2007 VJ305

K07VU5J 2007 VJ305 (q=35.144 AU, Q=361.690 AU, H=6.8 ~148 km) was discovered at 0600 UT on 4 Nov. 2007 by Apache Point Obs., which observed it at 2007 Sept. 14.30p2 at V=22.7-23.6, 2007 Sept. 22.33p2 at V=22.4-23.0, 2007 Oct. 12.34-35p2 at V=22.4-23.0, 2007 Oct. 14.34p2 at V=23.0-24.4, Nov. 4.25p2 at V=22.4-23.4, 7.21p2 at V=22.5-23.4, 11.26p2 at V=22.4-23.3, 13.25p2 at V=23.2-24.6, and 14.25p2 at V=22.6-23.8.
K07Tg2K 2007 TK422 (Centaur, q=16.769 AU, Q=25.637 AU, H=8.7 ~61.6 km) was discovered at 0757 UT on 6 Oct. 2007 by Apache Point, which observed it at 2007 Sept. 15.29p2 at V=22.5-23.4, 2007 Sept. 22.32p2, 2007 Oct. 6.33p2 at V=22.6-23.5, 2007 Oct. 13.33-34p2 at V=22.7-9, 2007 Oct. 15.34p2 at V=22.4-23.2, 2007 Oct. 20.32-33p2 at V=22.7-23.5, Nov. 11.25-26p2 at V=22.6-23.4, and 12.24p2 at V=22.6-23.3.

MPEC 2008-D47 - "17:56 UT" - 2008 DA4

K08D04A 2008 DA4 (risk-listed, Earth MOID=2.5 LD, H=24.1 ~51m) was discovered at 0644 UT on 27 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 27.28-30p4 and 27.38-42p8. The discovery was confirmed by Jim Young via Table Mtn. Obs. (Feb. 27.43-44p4).

MPEC 2008-D46 - "12:33 UT" - 2008 DY

K08D00Y 2008 DY (risk-listed, Q=4.374 AU, H=20.5 ~269m) was discovered at 0800 UT on 26 Feb. by LINEAR, which observed it at Feb. 26.33-38p5. The discovery was confirmed by Young/Table Mtn. (Feb. 27.29-31p4) and Farpoint Obs. (Feb. 27.31p4).

MPEC 2008-D45 - "12:29 UT" - 2008 DX

K08D00X 2008 DX (small asteroid, H=23.6 ~65m) was discovered at 0554 UT on 26 Feb. by the Mt. Lemmon Survey (MLS), which observed it at Feb. 26.25-32p8 and 26.42-44p4. The discovery was confirmed by Great Shefford Obs. (Feb. 26.98-99p2), Young/Table Mtn. (Feb. 27.25-28p5), and Farpoint Obs. (Feb. 27.27-29p3).

MPEC 2008-D44 - "12:26 UT" - 2008 DW

K08D00W 2008 DW (H=21.6 ~162m) was discovered at 0519 UT on 26 Feb. by the Spacewatch 0.9m telescope, which observed it at Feb. 26.22-26p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Feb. 26.40-41p3 & 27.26-27p2), Great Shefford Obs. (Feb. 27.04-06p3), the SZTE Asteroid Program (SZTE) (Feb. 27.06-07p3), and Farpoint Obs. (Feb. 27.29-30p3).

MPEC 2008-D43 - "12:23 UT" - 2008 DV

K08D00V 2008 DV (H=17.9 ~891m) was discovered at 0252 UT on 26 Feb. by MLS, which observed it at Feb. 26.12-17p8 and 27.10-12p4. The discovery was confirmed by SZTE (Feb. 26.81-83p3), Great Shefford Obs. (Feb. 26.82-83p2), and Young/Table Mtn. (Feb. 27.12-14p5).

<< DOU on 27 Feb. '08 >> MPEC 2008-D42 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K08D00J 2008 DJ (arc=2 days, H=20.4 ~282m) from LINEAR (Feb. 26.15-20p5), MLS (Feb. 26.21-23p4), Montana Blanca Obs. (Feb. 26.83-84p3), Alter Satzberg Obs. (Feb. 26.89-90p3), Great Shefford Obs. (Feb. 27.00-01p3), and Young/Table Mtn. (Feb. 27.16-18p4)
K08D00B 2008 DB (small asteroid, arc=9 days, H=25.6 ~26m) from Spacewatch 1.8m (Feb. 27.24-25p3)
K08CB6L 2008 CL116 (Q=5.279 AU, arc=16 days, H=20.3 ~295m) from Spacewatch 1.8m (Feb. 26.42-43p3)
K08A04F 2008 AF4 (arc=48 days, H=19.7 ~389m) from Alter Satzberg Obs. (Feb. 26.91-94p4)
Observations of recently (no longer) risk-listed objects
K08D00E 2008 DE (arc=15 days, H=19.4 ~446m) from SZTE (Feb. 27.12-13p4)
K08C20M 2008 CM20 (arc=19 days, H=21.0 ~214m) from Spacewatch 1.8m (Feb. 26.17-18p3 & 27.15-16p3)
Observations of small asteroids (H>22.0)
K08CH5B 2008 CB175 (arc=3 days, H=25.5 ~27m) from Spacewatch 1.8m (Feb. 26.45p2)
K08CB9E 2008 CE119 (arc=14 days, H=25.6 ~26m) from SZTE (Feb. 27.10-11p3)
K08CB6P 2008 CP116 (arc=73 days, H=23.0 ~85m) from KLENOT (Feb. 25.94-95p6), MLS (Feb. 26.30-32p4), and LINEAR (Feb. 26.39-44p5)
K08B02T 2008 BT2 (arc=40 days, H=24.3 ~47m) from Spacewatch 1.8m (Feb. 27.19-20p2 at V=22.4)
Observations of other objects
K08CB6M 2008 CM116 (arc=16 days, H=17.3 ~1.17 km) from Spacewatch 1.8m (Feb. 26.43-44p3)
K08CB6J 2008 CJ116 (arc=16 days, H=19.4 ~446m) from Spacewatch 1.8m (Feb. 26.24p1)
K08C71D 2008 CD71 (i=47.2°, q=0.364 AU, arc=17 days, H=19.7 ~389m) from KLENOT (Feb. 25.98p3) and Spacewatch 1.8m (Feb. 26.25p3)
K08C70N 2008 CN70 (arc=17 days, H=19.2 ~490m) from the Siding Spring Survey (SSS) (Feb. 26.42p2)
K08C01Q 2008 CQ1 (arc=47 days, H=19.4 ~446m) from Spacewatch 1.8m (Feb. 27.17p2)
K08C01N 2008 CN1 (arc=24 days, H=20.6 ~257m) from Brainerd Obs. (Feb. 26.08-10p5)
K08C00M 2008 CM (i=36.0°, arc=25 days, H=17.1 ~1.29 km) from Spacewatch 1.8m (Feb. 27.10-11p3)
K07S02V 2007 SV2 (arc=157 days, H=21.2 ~195m) from MLS (Feb. 24.15-16p4)
K06BE8A 2006 BA148 (arc=2 opp, H=18.5 ~676m) from Spacewatch 0.9m (Feb. 24.29-33p3 & 26.17-20p3)
K06B55G 2006 BG55 (arc=3 opp, H=18.2 ~776m) from SZTE (Feb. 26.08-09p2)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from LINEAR (Feb. 26.16-21p4)
K05S01R 2005 SR1 (arc=2 opp, H=19.3 ~467m) from Spacewatch 1.8m (Feb. 26.26p2)
K05H03C 2005 HC3 (arc=2 opp, H=17.8 ~933m) from Spacewatch 1.8m (Feb. 26.53-54p3)
K05E70K 2005 EK70 (arc=4 opp, H=17.4 ~1.12 km) from Brainerd Obs. (Feb. 26.07-08p3)
K04XG4P 2004 XP164 (arc=3 opp, H=17.5 ~1.07 km) from LINEAR (Feb. 26.16-21p5)
K02T66D 2002 TD66 (arc=4 opp, H=20.3 ~295m) from Brainerd Obs. (Feb. 26.05-06p6)
K02S41S 2002 SS41 (i=63.7°, arc=3 opp, H=17.1 ~1.29 km) from MLS (Feb. 26.49-51p4)
K02J00C 2002 JC (i=40.9°, arc=6 opp, H=17.1 ~1.29 km) from SZTE (Feb. 27.15-16p6)
K01S10G 2001 SG10 (arc=4 opp, H=20.5 ~269m) from the Sloan Digital Sky Survey (SDSS) (2001 Feb. 20.25p2)
K00E70R 2000 ER70 (i=36.9°, arc=4 opp, H=16.9 ~1.41 km) from SZTE (Feb. 27.16-17p3)
H0891 170891 2004 TY16 from Mt. Tuffley Obs. (Feb. 27.01p3)
G4222 164222 2004 RN9 from Spacewatch 1.8m (Feb. 26.49-51p3)
G2038 162038 1996 DH from Goodricke-Pigott Obs. (Feb. 26.21-24p3)
F3591 153591 2001 SN263 from Mt. Tuffley Obs. (Feb. 26.99p3)
D7802 137802 1999 YT from Spacewatch 0.9m (Feb. 26.50p1)
86067 86067 1999 RM28 from MLS (Feb. 26.49-52p4)
66959 66959 1999 XO35 from MLS (Feb. 26.12-15p4)
11398 11398 1998 YP11 from Urseanu Obs. (Feb. 25.99-01p4)
07977 7977 1977 QQ5 from LINEAR (Feb. 26.24-27p3)
06455 6455 1992 HE from LINEAR (Feb. 26.27-32p5)
05646 5646 1990 TR from Spacewatch 0.9m (Feb. 26.37-40p3)
04954 4954 Eric (1990 SQ) from Mt. Tuffley Obs. (Feb. 26.97p3)
04544 4544 Xanthus (1989 FB) from LINEAR (Feb. 26.16-21p5)
03691 3691 Bede (1982 FT) from LINEAR (Feb. 26.46-50p5)
03554 3554 Amun (1986 EB) from LINEAR (Feb. 26.11-15p5)
02202 2202 Pele (1972 RA) from MLS (Feb. 26.36-38p4)
02101 2101 Adonis (1936 CA) from Spacewatch 0.9m (Feb. 26.44-48p2)
01620 1620 Geographos (1951 RA) from Urseanu Obs. (Feb. 25.90-92p3)

MPEC 2008-D41 - "03:06 UT" - 2008 BC22

K08B22C 2008 BC22 (H=19.7 ~389m) from MLS (Jan. 11.44-47p4 & Feb. 26.46-48p4), Great Shefford Obs. (Feb. 27.02-03p3), and SZTE (Feb. 27.08-09p4)

MPEC 2008-D40 - "00:07 UT" - 2007 UM126

K07UC6M 2007 UM126 (i=41.7°, q=8.508 AU, Q=17.295 AU, H=10.0 ~33.9 km) was discovered at 0551 UT on 30 Oct. 2007 by Apache Point, which observed it at 2007 Oct. 14.33p2, 2007 Oct. 20.32p2, 2007 Oct. 30.24-25p2, Nov. 4.24p2, 5.24p2, 8.24p2, 11.25p2, 13.24p2, 14.24p2, 17.24p2, and 19.22p2. The discovery was confirmed by NEAT's Mt. Palomar telescope (2001 July 28.20-22p3), Spacewatch 0.9m (2006 Aug. 21.33-37p3 & 2006 Oct. 23.09-12p3), and MLS (2007 Sept. 10.38-40p4, 2007 Oct. 7.24-26p4, 2007 Oct. 19.24-26p4, 2007 Oct. 30.25-27p4 & Nov. 5.18-20p4).

Observers on 27 February '08

A total of 20 observing facilities appear in today's MPECs.

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 2 in MPEC 2008-D42 -- 2008 DJ, 2008 AF4
`705`	Apache Point Obs. in New Mexico, 3 in MPECs 2008-D40 & 2008-D48 -- 2007 VJ305, 2007 UM126, 2007 TK422
`726`	Brainerd Obs. in Minnesota, 3 in MPEC 2008-D42 -- 2008 CN1, 2005 EK70, 2002 TD66
`703`	Catalina Sky Survey in Arizona, 1 in MPEC 2008-D47 -- 2008 DA4
`734`	Farpoint Obs. in Kansas, 3 in MPECs 2008-D44, 2008-D45 & 2008-D46 -- 2008 DY, 2008 DX, 2008 DW
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-D42 -- 162038
`J95`	Great Shefford Obs. in England, 5 in MPECs 2008-D41, 2008-D42, 2008-D43, 2008-D44 & 2008-D45 -- 2008 DX, 2008 DW, 2008 DV, 2008 DJ, 2008 BC22
`246`	KLENOT in the Czech Republic, 2 in MPEC 2008-D42 -- 2008 CP116, 2008 CD71
`704`	LINEAR in New Mexico, 10 in MPECs 2008-D42 & 2008-D46 -- 2008 DY, 2008 DJ, 2008 CP116, 2005 TU45, 2004 XP164, 7977, 6455, 4544, 3691, 3554
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-D42 -- 2008 DJ
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2008-D40, 2008-D41, 2008-D42, 2008-D43 & 2008-D45 -- 2008 DX, 2008 DV, 2008 DJ, 2008 CP116, 2008 BC22, 2007 UM126, 2007 SV2, 2002 SS41, 86067, 66959, 2202
`J93`	Mt. Tuffley Obs. in England, 3 in MPEC 2008-D42 -- 170891, 153591, 4954
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-D40 -- 2007 UM126
`461`	SZTE Asteroid Program (SZTE) in Hungary, 8 in MPECs 2008-D41, 2008-D42, 2008-D43 & 2008-D44 -- 2008 DW, 2008 DV, 2008 DE, 2008 CE119, 2008 BC22, 2006 BG55, 2002 JC, 2000 ER70
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2008-D42 -- 2008 CN70
`645`	Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2008-D42 -- 2001 SG10
`691`	Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2008-D40, 2008-D42 & 2008-D44 -- 2008 DW, 2007 UM126, 2006 BA148, 137802, 5646, 2101
`291`	Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2008-D42 & 2008-D44 -- 2008 DW, 2008 DB, 2008 CQ1, 2008 CM20, 2008 CM116, 2008 CM, 2008 CL116, 2008 CJ116, 2008 CD71, 2008 CB175, 2008 BT2, 2005 SR1, 2005 HC3, 164222
`6735`	Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2008-D42, 2008-D43, 2008-D45, 2008-D46 & 2008-D47 -- 2008 DY, 2008 DX, 2008 DV, 2008 DJ, 2008 DA4
`A92`	Urseanu Obs. in Romania, 2 in MPEC 2008-D42 -- 11398, 1620

Impact Risk Monitoring on 27 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 DA4	JPL Sentry	2205	2011-2108	339	1.1e-06	-5.43	-6.50	0	JPL: "Analysis based on 16 observations spanning .15991 days (2008-Feb-27.28072 to 2008-Feb-27.44063)." Diameter approximately 0.050 km. from mean, weighted H=24.1.

2008 DY	JPL Sentry	1627	2041-2102	4	8.4e-10	-6.88	-7.28	0	JPL: "Analysis based on 13 observations spanning .97935 days (2008-Feb-26.33385 to 2008-Feb-27.3132)." Diameter approximately 0.272 km. from mean, weighted H=20.5.

2008 DJ	NEODyS	1627	2069	1	5.78e-10	-6.95	-6.95	0	NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2008/02/25.338 to 2008/02/27.182."
2008 DJ	JPL Sentry	1627	R E M O V E D						JPL: Risk listing removed at 1025 UTC.

2008 DB	JPL Sentry	1627	2046-2108	28	4.4e-05	-4.75	-4.83	0	JPL: "Analysis based on 49 observations spanning 9.0117 days (2008-Feb-18.242 to 2008-Feb-27.25368)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2008 DB	NEODyS	1627	2046-2089	28	2.58e-05	-4.98	-5.05	0	NEODyS: "Based on 50 optical observations (of which 2 are rejected as outliers) from 2008/02/18.243 to 2008/02/27.254."

2008 CL116	JPL Sentry	1627	2102	1	3.9e-07	-4.17	-4.17	0	JPL: "Analysis based on 65 observations spanning 16.019 days (2008-Feb-10.40671 to 2008-Feb-26.42554)." Diameter approximately 0.300 km. from mean, weighted H=20.3.

2008 AF4	JPL Sentry	1704	2078-2099	16	2.0e-05	-2.37	-2.49	1	JPL: "Analysis based on 551 observations spanning 47.539 days (2008-Jan-10.39652 to 2008-Feb-26.93579)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
2008 AF4	NEODyS	1627	2078-2090	10	1.6e-05	-2.46	-2.49	1	NEODyS: "Based on 555 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/26.937. NOTE: The Virtual Impactor in 2089/01/09.485 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 27 February '08

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

2307	Grabbed MPEC 2008-D48 - 2007 TK422, 2007 VJ305 - see above
2205	Noted that JPL Sentry has posted 2008 DA4 as an impact risk - see above
1814	Grabbed MPEC 2008-D47 - 2008 DA4 - see above
1704	Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
1628	Grabbed MPEC 2008-D42 - Daily Orbit Update - see above
1627	Noted that NEODyS has updated its 2008 AF4 risk assessment - see above Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above Noted that JPL Sentry has updated its 2008 DB risk assessment - see above Noted that NEODyS has updated its 2008 DB risk assessment - see above Noted that JPL Sentry has removed 2008 DJ as an impact risk - see above Noted that NEODyS has updated its 2008 DJ risk assessment - see above Noted that JPL Sentry has posted 2008 DY as an impact risk - see above
1626	Grabbed MPEC 2008-D43 - 2008 DV - see above Grabbed MPEC 2008-D44 - 2008 DW - see above Grabbed MPEC 2008-D45 - 2008 DX - see above Grabbed MPEC 2008-D46 - 2008 DY - see above
0401	Grabbed MPEC 2008-D41 - 2008 BC22 - see above
0032	Grabbed MPEC 2008-D40 - 2007 UM126 - see above

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