2008-02-28 Tracking News

Contents on 28 February '08

IAU Minor Planet Center
- NEOCP Activity -- 14 listings: 2 new, 12 updated
- New MPECs -- five MPECs
- Observers -- seventeen 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 28 February '08

The MPC's NEO Confirmation Page has 14 listings: 2 new, 12 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and twelve updated listings. All of these were "one nighters." So far The Tracking News has counted a total of 25 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 28 February '08

Minor Planet Electronic Circulars

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

MPEC 2008-D49 time-stamped "01:39 UT" - 2008 DG4 - see below
MPEC 2008-D50 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2008-D51 time-stamped "12:37 UT" - 2008 AZ110 - see below
MPEC 2008-D52 time-stamped "15:41 UT" - 2008 DL4 - see below
MPEC 2008-D53 time-stamped "18:06 UT" - 2007 YY59

MPEC 2008-D53 - "18:06 UT" - 2007 YY59

K07Y59Y 2007 YY59 (small asteroid, H=24.1 ~51m) was discovered at 0829 UT on 30 Dec. 2007 by the Spacewatch 0.9m telescope, which observed it at Dec. 30.35-39p3 and Jan. 14.29-32p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Dec. 30.48-49p3 & 31.26p3).

MPEC 2008-D52 - "15:41 UT" - 2008 DL4

K08D04L 2008 DL4 (small asteroid, Earth MOID=3.3 LD, H=27.0 ~13m) was discovered at 1214 UT on 27 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 27.43-46p4 and 27.51-53p5. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (Feb. 28.40-45p8). This object is now within ten lunar distances (LD) of Earth, reaching 5.6 LD on 26 Feb.

MPEC 2008-D51 - "12:37 UT" - 2008 AZ110

K08AB0Z 2008 AZ110 (Q=4.029 AU, H=18.3 ~741m) from CSS (2004 June 10.39-42p4), Spacewatch 0.9m (2004 Aug. 22.14-19p3), MLS (Feb. 13.21-26p8 & 27.21-28p7), and Spacewatch 1.8m (Feb. 28.13-14p3)

<< DOU on 28 Feb. '08 >> MPEC 2008-D50 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K08D04G 2008 DG4 (small asteroid, Q=4.106 AU, arc=1 day, H=23.4 ~71m) from the SZTE Asteroid Program (SZTE) (Feb. 28.06p2)
K08D00Y 2008 DY (Q=4.294 AU, arc=1 day, H=20.4 ~282m) from LINEAR (Feb. 27.33-38p5)
K08D00J 2008 DJ (arc=3 days, H=20.4 ~282m) from Petit Jean Mtn. South Obs. (PJMSO) (Feb. 27.29-30p7), Nazaret Obs. (Feb. 27.86-87p3), and Malaga Obs. (Feb. 27.87-89p2)
K08CB6L 2008 CL116 (Q=5.303 AU, arc=17 days, H=20.3 ~295m) from Spacewatch 1.8m (Feb. 27.35-36p2)
Observations of recently (no longer) risk-listed objects
K08D00E 2008 DE (arc=15 days, H=19.4 ~446m) from Desert Moon Obs. (Feb. 27.44p2)
K08C22D 2008 CD22 (small asteroid, arc=18 days, H=22.2 ~123m) from PJMSO (Feb. 27.35p7)
K08C06E 2008 CE6 (small asteroid, arc=20 days, H=23.5 ~68m) from Spacewatch 1.8m (Feb. 27.47-48p3)
K08B18T 2008 BT18 (arc=27 days, H=18.5 ~676m) from PJMSO (Feb. 27.26-28p6)
K08B15D 2008 BD15 (arc=25 days, H=20.6 ~257m) from Astronomical Research Obs. (ARO) (Feb. 24.14-15p6)
Observations of small asteroids (H>22.0)
K08CH5B 2008 CB175 (arc=13 days, H=25.5 ~27m) from Spacewatch 1.8m (Feb. 27.49-50p2)
K08CB6P 2008 CP116 (arc=74 days, H=23.0 ~85m) from LINEAR (Feb. 27.27-32p4)
K08B02V 2008 BV2 (arc=39 days, H=22.9 ~89m) from Spacewatch 0.9m (Feb. 27.18-19p2)
Observations of other objects
K08CB9J 2008 CJ119 (arc=57 days, H=21.7 ~155m) from Desert Moon Obs. (Feb. 27.26-32p3)
K08CB6S 2008 CS116 (Q=4.552 AU, arc=107 days, H=20.8 ~234m) from CSS (Feb. 27.43-46p4)
K08CB6M 2008 CM116 (arc=17 days, H=17.3 ~1.17 km) from Spacewatch 1.8m (Feb. 27.46-47p2)
K08C70J 2008 CJ70 (arc=25 days, H=21.4 ~178m) from Jim Young via Table Mtn. Obs. (Feb. 28.24-26p4)
K08C01N 2008 CN1 (arc=25 days, H=20.6 ~257m) from PJMSO (Feb. 27.26p6)
K08C01L 2008 CL1 (arc=25 days, H=19.4 ~446m) from PJMSO (Feb. 27.39-40p8) and Desert Moon Obs. (Feb. 27.42-43p5)
K08C00M 2008 CM (i=36.0°, arc=25 days, H=17.1 ~1.29 km) from Desert Moon Obs. (Feb. 27.09-10p3)
K08C00H 2008 CH (arc=26 days, H=20.3 ~295m) from Desert Moon Obs. (Feb. 27.36-40p4)
K08B22C 2008 BC22 (arc=47 days, H=19.6 ~407m) from Spacewatch 0.9m (Jan. 30.46-50p3) and LINEAR (Feb. 27.40-45p5)
K08A28V 2008 AV28 (arc=67 days, H=19.5 ~426m) from ARO (Feb. 24.13-14p3)
K08A01X 2008 AX1 (arc=47 days, H=21.3 ~186m) from the Siding Spring Survey (SSS) (Jan. 26.47p1)
K08A00E 2008 AE (arc=2 opp, H=19.7 ~389m) from PJMSO (Feb. 27.41-42p7)
K07Y01M 2007 YM1 (arc=23 days, H=20.8 ~234m) from SSS (Jan. 10.57p1)
K07T24U 2007 TU24 (arc=139 days, H=20.6 ~257m) from PJMSO (Feb. 27.40-41p5)
K07T08G 2007 TG8 (Q=4.306 AU, arc=167 days, H=18.6 ~645m) from PJMSO (Feb. 27.34-35p6)
K07R19X 2007 RX19 (i=40.4°, arc=166 days, H=18.5 ~676m) from PJMSO (Feb. 27.25p6)
K07M20T 2007 MT20 (arc=2 opp, H=18.7 ~616m) from Spacewatch 1.8m (Feb. 27.21-22p3)
K06D62U 2006 DU62 (arc=3 opp, H=18.1 ~812m) from PJMSO (Feb. 27.31p5)
K06B00G 2006 BG (arc=3 opp, H=18.6 ~645m) from ARO (Feb. 24.10-12p3)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from LINEAR (Feb. 27.10-15p5)
K05S01R 2005 SR1 (arc=2 opp, H=19.3 ~467m) from Spacewatch 1.8m (Feb. 27.41-43p3)
K05E70K 2005 EK70 (arc=4 opp, H=17.4 ~1.12 km) from PJMSO (Feb. 27.23-24p6)
K05E00A 2005 EA (arc=2 opp, H=21.0 ~214m) from CSS (Feb. 27.32-33p3 & 27.42p4) and Young/Table Mtn. (Feb. 27.46-47p4)
K05B02E 2005 BE2 (arc=2 opp, H=18.2 ~776m) from PJMSO (Feb. 27.39p5)
K04C02R 2004 CR2 (arc=2 opp, H=19.5 ~426m) from LINEAR (Feb. 27.41-44p3)
K02T66D 2002 TD66 (arc=4 opp, H=20.2 ~309m) from LINEAR (Feb. 27.22-26p5)
K00DA7P 2000 DP107 (arc=4 opp, H=18.2 ~776m) from PJMSO (Feb. 27.33-34p5)
K00D08K 2000 DK8 (Q=4.269 AU, arc=3 opp, H=19.2 ~490m) from LINEAR (Feb. 27.11-15p4)
H7049 177049 2003 EE16 from LINEAR (Feb. 27.34-38p5)
H5921 175921 2000 DM1 from LONEOS (Feb. 27.22-29p4), PJMSO (Feb. 27.38-39p5), and LINEAR (Feb. 27.39-44p5)
H0891 170891 2004 TY16 from LINEAR (Feb. 27.27-32p5)
F3591 153591 2001 SN263 from Stammersdorf Obs. (Feb. 27.91-93p6)
D8205 138205 2000 EZ148 from LONEOS (Feb. 27.22-30p4) and LINEAR (Feb. 27.41-43p3)
96189 96189 1991 NT3 from Hack Obs. (Feb. 17.86-87p3)
86324 86324 1999 WA2 from LINEAR (Feb. 27.16-21p5)
22099 22099 2000 EX106 from LONEOS (Feb. 27.15-19p4)
18736 18736 1998 NU from LINEAR (Feb. 27.11-15p5)
13553 13553 1992 JE from Spacewatch 0.9m (Feb. 27.35-39p3)
09400 9400 1994 TW1 from LINEAR (Feb. 27.39-44p5)
05131 5131 1990 BG from LINEAR (Feb. 27.16-21p4)
04544 4544 Xanthus (1989 FB) from LINEAR (Feb. 27.10-21p9)
03908 3908 Nyx (1980 PA) from MLS (Feb. 27.32-36p4)
03691 3691 Bede (1982 FT) from LINEAR (Feb. 27.39-44p5)
03554 3554 Amun (1986 EB) from LINEAR (Feb. 27.10-14p5)
01620 1620 Geographos (1951 RA) from CSS (Feb. 27.28-30p4), PJMSO (Feb. 27.31-33p5), LINEAR (Feb. 27.33-38p5), and Stammersdorf Obs. (Feb. 27.93-94p6)

MPEC 2008-D49 - "01:39 UT" - 2008 DG4

K08D04G 2008 DG4 (risk-listed, Q=4.113 AU, Earth MOID=3.9 LD, H=23.3 ~74m) was discovered at 0529 UT on 27 Feb. by LONEOS, which observed it at Feb. 27.23-31p4. The discovery was confirmed by Young/Table Mtn. (Feb. 27.44-46p4) and Gnosca Obs. (Feb. 27.91-93p3).

Observers on 28 February '08

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 3 in MPEC 2008-D50 -- 2008 BD15, 2008 AV28, 2006 BG
`703`	Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2008-D50, 2008-D51 & 2008-D52 -- 2008 DL4, 2008 CS116, 2008 AZ110, 2005 EA, 1620
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2008-D50 -- 2008 DE, 2008 CM, 2008 CL1, 2008 CJ119, 2008 CH
`143`	Gnosca Obs. in Switzerland, 1 in MPEC 2008-D49 -- 2008 DG4
`A57`	Hack Obs. in Italy, 1 in MPEC 2008-D50 -- 96189
`704`	LINEAR in New Mexico, 19 in MPEC 2008-D50 -- 2008 DY, 2008 CP116, 2008 BC22, 2005 TU45, 2004 CR2, 2002 TD66, 2000 DK8, 86324, 18736, 177049, 175921, 170891, 138205, 9400, 5131, 4544, 3691, 3554, 1620
`699`	LONEOS in Arizona, 4 in MPECs 2008-D49 & 2008-D50 -- 2008 DG4, 22099, 175921, 138205
`J40`	Malaga Obs. in Spain, 1 in MPEC 2008-D50 -- 2008 DJ
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-D50, 2008-D51 & 2008-D52 -- 2008 DL4, 2008 AZ110, 3908
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2008-D50 -- 2008 DJ
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 15 in MPEC 2008-D50 -- 2008 DJ, 2008 CN1, 2008 CL1, 2008 CD22, 2008 BT18, 2008 AE, 2007 TU24, 2007 TG8, 2007 RX19, 2006 DU62, 2005 EK70, 2005 BE2, 2000 DP107, 175921, 1620
`461`	SZTE Asteroid Program in Hungary, 1 in MPEC 2008-D50 -- 2008 DG4
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-D50 -- 2008 AX1, 2007 YM1
`691`	Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2008-D50, 2008-D51 & 2008-D53 -- 2008 BV2, 2008 BC22, 2008 AZ110, 2007 YY59, 13553
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2008-D50, 2008-D51 & 2008-D53 -- 2008 CM116, 2008 CL116, 2008 CE6, 2008 CB175, 2008 AZ110, 2007 YY59, 2007 MT20, 2005 SR1
`A97`	Stammersdorf Obs. in Austria, 2 in MPEC 2008-D50 -- 153591, 1620
`6735`	Jim Young via Table Mtn. Obs. in southern California, 3 in MPECs 2008-D49 & 2008-D50 -- 2008 DG4, 2008 CJ70, 2005 EA

Impact Risk Monitoring on 28 February '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 DG4	JPL Sentry	1555	2062-2095	6	5.8e-08	-6.65	-7.05	0	JPL #2 for the day: "Analysis based on 13 observations spanning .83369 days (2008-Feb-27.22883 to 2008-Feb-28.06252)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
2008 DG4	NEODyS	1555	2085-2089	3	3.6e-08	-6.86	-7.12	0	NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2008/02/27.230 to 2008/02/28.063."

2008 DA4	NEODyS	1555	2015-2087	28	1.04e-07	-6.30	-6.64	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/02/27.281 to 2008/02/27.441."

2008 DY	JPL Sentry	1555	R E M O V E D						JPL: Risk listing removed at 1117 UTC.

2008 DV	NEODyS	1555	2011-2090	11	2.56e-09	-4.22	-4.46	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2008/02/26.121 to 2008/02/27.145."

2008 DJ	NEODyS	1555	R E M O V E D

2008 CL116	JPL Sentry	1555	2102	1	1.3e-08	-5.65	-5.65	0	JPL: "Analysis based on 67 observations spanning 16.956 days (2008-Feb-10.40671 to 2008-Feb-27.36239)." 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 28 February '08

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

1831	Grabbed MPEC 2008-D53 - 2007 YY59 - see above
1555	Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above Noted that NEODyS has posted 2008 DA4 as an impact risk - see above Noted that JPL Sentry has updated its 2008 DG4 risk assessment - see above Noted that NEODyS has posted 2008 DG4 as an impact risk - see above Noted that NEODyS has removed 2008 DJ as an impact risk - see above Noted that NEODyS has posted 2008 DV as an impact risk - see above Noted that JPL Sentry has removed 2008 DY as an impact risk - see above Grabbed MPEC 2008-D50 - Daily Orbit Update - see above Grabbed MPEC 2008-D51 - 2008 AZ110 - see above Grabbed MPEC 2008-D52 - 2008 DL4 - see above
0402	Noted that JPL Sentry has posted 2008 DG4 as an impact risk - see above
0241	Grabbed MPEC 2008-D49 - 2008 DG4 - see above

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