2007-12-26 Tracking News

Contents on 26 December '07

IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- one MPEC
- Observers -- nine observing facilities
Impact Risk Monitoring -- two 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 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 26 December '07

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (last checked at 2354 UTC).

New MPECs on 26 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 26 Dec. '07 >> MPEC 2007-Y49 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y02B 2007 YB2 (Q=4.955 AU, arc=7 days, H=18.2 ~776m) from Desert Moon Obs. (Dec. 25.43-45p3)
K07X11K 2007 XK11 (Q=4.502 AU, arc=20 days, H=19.2 ~490m) from Gnosca Obs. (Dec. 9.72-73p2) and Farpoint Obs. (Dec. 26.23-27p4)
Observations of recently (no longer) risk-listed objects
K07X25F 2007 XF25 (arc=10 days, H=21.2 ~195m) from Astronomical Research Obs. (ARO) (Dec. 25.27-28p3)
Observations of small asteroids (H>22.0)
K07X23V 2007 XV23 (Q=4.660 AU, arc=11 days, H=25.0 ~34m) from ARO (Dec. 25.29-31p3)
K07X23T 2007 XT23 (Q=4.543 AU, arc=10 days, H=22.6 ~102m) from ARO (Dec. 25.17-19p3)
K07X23A 2007 XA23 (arc=11 days, H=23.1 ~81m) from ARO (Dec. 25.23-24p3)
K07V03H 2007 VH3 (arc=53 days, H=22.6 ~102m) from Desert Moon Obs. (Dec. 25.28-31p3)
Observations of other objects
K07Y01X 2007 YX1 (Q=4.543 AU, arc=64 days, H=17.2 ~1.23 km) from Gnosca Obs. (Dec. 21.70-72p3)
K07Y01M 2007 YM1 (arc=7 days, H=20.8 ~234m) from ARO (Dec. 25.14-15p7)
K07Y00K 2007 YK (arc=9 days, H=17.5 ~1.07 km) from ARO (Dec. 25.33-35p4) and Desert Moon Obs. (Dec. 25.33-35p3)
K07Y00H 2007 YH (arc=9 days, H=20.1 ~323m) from ARO (Dec. 25.24p5)
K07X16H 2007 XH16 (arc=17 days, H=19.6 ~407m) from Montcabre Obs. (Dec. 25.74-76p3)
K07X09Y 2007 XY9 (arc=21 days, H=21.1 ~204m) from Desert Moon Obs. (Dec. 25.23-26p3)
K07W05B 2007 WB5 (arc=35 days, H=18.9 ~562m) from ARO (Dec. 25.17-19p3)
K07VI8A 2007 VA188 (Q=4.856 AU, arc=43 days, H=19.5 ~426m) from ARO (Dec. 25.15-16p3)
K07VD7W 2007 VW137 (arc=47 days, H=18.1 ~812m) from Desert Moon Obs. (Dec. 25.17-21p3)
K07V04Q 2007 VQ4 (arc=48 days, H=15.8 ~2.34 km, q=1.271 AU) from Hormersdorf Obs. (Dec. 21.86p4)
K07U01X 2007 UX1 (arc=69 days, H=20.4 ~282m) from ARO (Dec. 25.19-20p3)
K07T23C 2007 TC23 (Q=4.525 AU, arc=76 days, H=20.6 ~257m) from ARO (Dec. 25.36-37p3)
K07T18Z 2007 TZ18 (arc=77 days, H=21.0 ~214m) from ARO (Dec. 25.25-27p3)
K07R12U 2007 RU12 (arc=104 days, H=20.0 ~339m) from ARO (Dec. 25.16-17p3)
K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from Hormersdorf Obs. (Dec. 21.89-90p5)
K05S71E 2005 SE71 (arc=2 opp, H=18.1 ~812m) from Farpoint Obs. (Dec. 26.06-07p3)
K03W25M 2003 WM25 (Q=4.100 AU, arc=2 opp, H=17.7 ~977m) from Desert Moon Obs. (Dec. 25.12-15p3)
K03R10N 2003 RN10 (i=39.6°, arc=4 opp, H=15.9 ~2.24 km, q=1.024 AU) from ARO (Dec. 25.20-21p2)
K00Q69Y 2000 QY69 (arc=4 opp, H=19.8 ~371m) from ARO (Dec. 25.42-44p3)
K00DA7P 2000 DP107 (arc=4 opp, H=18.2 ~776m) from ARO (Dec. 25.38-40p3)
J96A01J 1996 AJ1 (q=0.286 AU, arc=3 opp, H=20.2 ~309m) from ARO (Dec. 25.32p3)
J94A01W 1994 AW1 (arc=3 opp, H=17.5 ~1.07 km) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 25.40-41p6)
F4347 154347 2002 XK4 from PJMSO (Dec. 25.41-42p5)
F3201 153201 2000 WO107 from Inastars Obs. (Dec. 25.78-83p4)
E0288 140288 2001 SN289 from Desert Moon Obs. (Dec. 25.50-52p3)
D6793 136793 1997 AQ18 from Hormersdorf Obs. (Dec. 21.85p4)
85839 85839 1998 YO4 from Desert Moon Obs. (Dec. 25.47-49p3)
54660 54660 2000 UJ1 from Desert Moon Obs. (Dec. 25.05-09p3)
54401 54401 2000 LM from Paus Obs. (Dec. 25.86p1)
03691 3691 Bede (1982 FT) from PJMSO (Dec. 25.44-45p5)
01620 1620 Geographos (1951 RA) from PJMSO (Dec. 25.42-43p5)

Observers on 26 December '07

Nine observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 17 in MPEC 2007-Y49 -- 2007 YM1, 2007 YK, 2007 YH, 2007 XV23, 2007 XT23, 2007 XF25, 2007 XA23, 2007 WB5, 2007 VA188, 2007 UX1, 2007 TZ18, 2007 TC23, 2007 RU12, 2003 RN10, 2000 QY69, 2000 DP107, 1996 AJ1
`448`	Desert Moon Obs. in New Mexico, 9 in MPEC 2007-Y49 -- 2007 YK, 2007 YB2, 2007 XY9, 2007 VW137, 2007 VH3, 2003 WM25, 85839, 54660, 140288
`734`	Farpoint Obs. in Kansas, 2 in MPEC 2007-Y49 -- 2007 XK11, 2005 SE71
`143`	Gnosca Obs. in Switzerland, 2 in MPEC 2007-Y49 -- 2007 YX1, 2007 XK11
`A35`	Hormersdorf Obs. in Germany, 3 in MPEC 2007-Y49 -- 2007 VQ4, 2005 WJ56, 136793
`B15`	Inastars Obs. in Germany, 1 in MPEC 2007-Y49 -- 153201
`213`	Montcabre Obs. in Spain, 1 in MPEC 2007-Y49 -- 2007 XH16
`B49`	Paus Obs. in Spain, 1 in MPEC 2007-Y49 -- 54401
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2007-Y49 -- 1994 AW1, 154347, 3691, 1620

Impact Risk Monitoring on 26 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 YB2	JPL Sentry	1437	2043-2084	2	4.8e-08	-3.80	-3.83	0	JPL: "Analysis based on 41 observations spanning 7.1059 days (2007-Dec-18.34552 to 2007-Dec-25.45139)." Diameter approximately 0.800 km. from mean, weighted H=18.1.
2007 YB2	NEODyS	1437	2040-2084	3	5.74e-08	-3.72	-3.80	0	NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/25.452."

2007 XK11	JPL Sentry	1437	2101	1	2.5e-07	-4.19	-4.19	0	JPL: "Analysis based on 52 observations spanning 20.182 days (2007-Dec-06.0886 to 2007-Dec-26.27068)." Diameter approximately 0.480 km. from mean, weighted H=19.2.
2007 XK11	NEODyS	1437	R E M O V E D

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 26 December '07

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

1437

Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Noted that NEODyS has removed 2007 XK11 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above
Noted that NEODyS has updated its 2007 YB2 risk assessment - see above
Grabbed MPEC 2007-Y49 - Daily Orbit Update - see above

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