2007-12-28 Tracking News

Contents on 28 December '07

IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- one MPEC
- Observers -- twelve observing facilities
Impact Risk Monitoring -- one object
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 this year 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 December '07

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing.

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 December '07

Minor Planet Electronic Circulars

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

<< DOU on 28 Dec. '07 >> MPEC 2007-Y51 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X11K 2007 XK11 (Q=4.506 AU, arc=22 days, H=19.2 ~490m) from the Spacewatch 1.8m telescope (Dec. 28.11p3)
Observations of recently (no longer) risk-listed objects
K07Y00Z 2007 YZ (arc=10 days, H=19.9 ~355m) from Hamamatsu-Yuto Obs. (Dec. 20.71-72p3), Desert Moon Obs. (Dec. 27.39p3), Verona Obs. (Dec. 27.95p4), and La Fecha Obs. (Dec. 28.02-07p3)
K07W04V 2007 WV4 (i=38.3°, arc=39 days, H=19.2 ~490m) from Desert Moon Obs. (Dec. 27.18-20p3) and Spacewatch 1.8m (Dec. 28.23-24p3)
K07VO3N 2007 VN243 (small asteroid, arc=41 days, H=22.4 ~112m) from Astronomical Research Obs. (ARO) (Dec. 26.03-04p4)
Observations of small asteroids (H>22.0)
K07P09S 2007 PS9 (arc=136 days, H=23.4 ~71m) from ARO (Dec. 25.45-47p3 & 26.40-43p3)
Observations of other objects
K07Y00H 2007 YH (arc=12 days, H=20.1 ~323m) from Verona Obs. (Dec. 27.97p4)
K07X20J 2007 XJ20 (arc=14 days, H=18.4 ~708m) from Desert Moon Obs. (Dec. 27.22-24p3)
K07X16H 2007 XH16 (arc=19 days, H=19.6 ~407m) from Schiaparelli Obs. (Dec. 24.94-95p5) and Hamamatsu-Yuto Obs. (Dec. 26.39-40p11 & 27.37-38p9)
K07X10C 2007 XC10 (i=48.0°, arc=22 days, H=19.4 ~446m) from Desert Moon Obs. (Dec. 27.29-35p3)
K07X03N 2007 XN3 (Q=4.152 AU, arc=23 days, H=20.6 ~257m) from ARO (Dec. 26.15-17p3)
K07W05B 2007 WB5 (arc=36 days, H=18.9 ~562m) from ARO (Dec. 26.10-12p4)
K07VI8A 2007 VA188 (Q=4.854 AU, arc=44 days, H=19.5 ~426m) from ARO (Dec. 26.06p2)
K07VI4G 2007 VG184 (arc=46 days, H=17.4 ~1.12 km) from Desert Moon Obs. (Dec. 27.10-15p3)
K07VD7X 2007 VX137 (arc=48 days, H=18.6 ~645m) from ARO (Dec. 26.13-15p3)
K07V04Q 2007 VQ4 (arc=55 days, H=15.8 ~2.34 km, q=1.271 AU) from New Millennium Obs. (Dec. 18.20p2), Hamamatsu-Yuto Obs. (Dec. 20.81p3 & 26.75p2), and Verona Obs. (Dec. 27.98-99p4)
K07T71D 2007 TD71 (i=49.8°, arc=76 days, H=18.5 ~676m) from Spacewatch 1.8m (Dec. 28.19-20p3)
K07S11E 2007 SE11 (i=48.3°, arc=96 days, H=17.8 ~933m) from ARO (Dec. 25.99-00p3)
K07S06P 2007 SP6 (arc=97 days, H=18.2 ~776m) from New Millennium Obs. (Dec. 18.15-18p6) and Paus Obs. (Dec. 27.93p1)
K07S00J 2007 SJ (arc=2 opp, H=16.5 ~1.70 km) from Spacewatch 1.8m (Dec. 28.08-09p3)
K07M13K 2007 MK13 (arc=2 opp, H=19.9 ~355m) from ARO (Dec. 26.40-41p3)
K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from Hamamatsu-Yuto Obs. (Dec. 26.80-81p3)
K05N07B 2005 NB7 (arc=3 opp, H=18.6 ~645m) from ARO (Dec. 26.30-31p3)
K04B58U 2004 BU58 (i=57.2°, arc=4 opp, H=18.1 ~812m) from ARO (Dec. 26.31-33p3)
K03U22D 2003 UD22 (arc=2 opp, H=19.7 ~389m) from ARO (Dec. 26.27-29p4)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.0 ~537m) from New Millennium Obs. (Dec. 18.06-13p6)
K02T60C 2002 TC60 (arc=2 opp, H=18.4 ~708m) from the Mt. Lemmon Survey (MLS) (2006 Nov. 15.10-12p4)
K02A31V 2002 AV31 (arc=3 opp, H=20.5 ~269m) from ARO (Dec. 26.34-35p3)
K01Q34C 2001 QC34 (arc=2 opp, H=20.1 ~323m) from ARO (Dec. 26.01-02p3)
K00YD7V 2000 YV137 (arc=4 opp, H=18.6 ~645m) from ARO (Dec. 26.36-37p3)
K00W10K 2000 WK10 (arc=3 opp, H=18.6 ~645m) from Spacewatch 1.8m (Dec. 28.07-08p3)
K00SG2Y 2000 SY162 (arc=2 opp, H=19.2 ~490m) from ARO (Dec. 26.26-27p3)
K00E70W 2000 EW70 (arc=850 days, H=21.3 ~186m) from Spacewatch 1.8m (Dec. 28.09-10p3)
K00C59H 2000 CH59 (arc=3 opp, H=19.6 ~407m) from ARO (Dec. 26.38-39p5)
J99F53N 1999 FN53 (arc=6 opp, H=18.3 ~741m) from MLS (Dec. 20.30-33p8) and ARO (Dec. 26.35-37p3)
J99A10Q 1999 AQ10 (arc=3 opp, H=20.3 ~295m) from ARO (Dec. 26.13-15p5)
J90S00M 1990 SM (arc=4 opp, H=16.1 ~2.04 km, q=0.491 AU) from ARO (Dec. 26.21-25p3)
J89A00Z 1989 AZ (arc=3 opp, H=19.5 ~426m) from Wildberg Obs. (Dec. 27.70-71p5)
H0891 170891 2004 TY16 from New Millennium Obs. (Dec. 18.07-14p10)
68063 68063 2000 YJ66 from New Millennium Obs. (Dec. 18.15-19p6)
25916 25916 2001 CP44 from New Millennium Obs. (Dec. 18.08-13p5)
03288 3288 Seleucus (1982 DV) from New Millennium Obs. (Dec. 18.16-20p6)
01862 1862 Apollo (1932 HA) from New Millennium Obs. (Dec. 18.17-20p4)
00433 433 Eros (1898 DQ) from Huelva Obs. (Dec. 27.77-78p3)

Observers on 28 December '07

Twelve observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 19 in MPEC 2007-Y51 -- 2007 XN3, 2007 WB5, 2007 VX137, 2007 VN243, 2007 VA188, 2007 SE11, 2007 PS9, 2007 MK13, 2005 NB7, 2004 BU58, 2003 UD22, 2002 AV31, 2001 QC34, 2000 YV137, 2000 SY162, 2000 CH59, 1999 FN53, 1999 AQ10, 1990 SM
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2007-Y51 -- 2007 YZ, 2007 XJ20, 2007 XC10, 2007 WV4, 2007 VG184
`379`	Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-Y51 -- 2007 YZ, 2007 XH16, 2007 VQ4, 2005 WJ56
`J37`	Huelva Obs. in Spain, 1 in MPEC 2007-Y51 -- 433
`J34`	La Fecha Obs. in Spain, 1 in MPEC 2007-Y51 -- 2007 YZ
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2007-Y51 -- 2002 TC60, 1999 FN53
`A24`	New Millennium Obs. in Italy, 8 in MPEC 2007-Y51 -- 2007 VQ4, 2007 SP6, 2002 XY4, 68063, 25916, 170891, 3288, 1862
`B49`	Paus Obs. in Spain, 1 in MPEC 2007-Y51 -- 2007 SP6
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2007-Y51 -- 2007 XH16
`291`	Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2007-Y51 -- 2007 XK11, 2007 WV4, 2007 TD71, 2007 SJ, 2000 WK10, 2000 EW70
`A48`	Verona Obs. in Italy, 3 in MPEC 2007-Y51 -- 2007 YZ, 2007 YH, 2007 VQ4
`198`	Wildberg Obs. in Germany, 1 in MPEC 2007-Y51 -- 1989 AZ

Impact Risk Monitoring on 28 December '07

**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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now 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

2007 XK11	JPL Sentry	1447	2101	1	1.2e-07	-4.52	-4.52	0	JPL: "Analysis based on 55 observations spanning 22.026 days (2007-Dec-06.0886 to 2007-Dec-28.11455)." Diameter approximately 0.480 km. from mean, weighted H=19.3.

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 December '07

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

2143	The NEOCP has become active
1447	Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above Grabbed MPEC 2007-Y51 - Daily Orbit Update - see above
0520	The NEOCP has become empty

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