2007-12-21 Tracking News

Contents on 21 December '07

IAU Minor Planet Center
- NEOCP Activity -- two listings: 1 new, 1 updated
- New MPECs -- one MPEC
- Observers -- 22 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 21 December '07

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." So far The Tracking News has counted a total of six 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 21 December '07

Minor Planet Electronic Circulars

As of last check at 2353 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 21 Dec. '07 >> MPEC 2007-Y40 - "07:06 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y02B 2007 YB2 (Q=6.083 AU, arc=3 days, H=18.0 ~851m) from the Spacewatch 1.8m telescope (Dec. 20.36-37p3), Jim Young via Table Mtn. Obs. (Dec. 20.43-44p4), Wildberg Obs. (Dec. 21.04-05p5), and KLENOT (Dec. 21.07-08p8)
Observations of recently (no longer) risk-listed objects
K07Y01N 2007 YN1 (small asteroid, Q=4.621 AU, arc=2 days, H=25.0 ~34m) from Bergisch Gladbach Obs. (Dec. 19.06-07p5) and Spacewatch 1.8m (Dec. 20.18-19p3)
K07Y00Z 2007 YZ (arc=3 days, H=19.9 ~355m) from KLENOT (Dec. 20.98p9)
K07Y00G 2007 YG (small asteroid, arc=4 days, H=23.1 ~81m) from the Spacewatch 0.9m telescope (Dec. 20.16p1)
K07X16J 2007 XJ16 (arc=15 days, H=18.9 ~562m) from Spacewatch 1.8m (Dec. 20.20-21p3)
K07X10D 2007 XD10 (arc=15 days, H=20.8 ~234m) from Spacewatch 1.8m (Dec. 20.22-23p3) and Spacewatch 0.9m (Dec. 20.42-45p3)
K07X03P 2007 XP3 (q=0.256 AU, Q=4.151 AU, arc=16 days, H=19.1 ~513m) from Spacewatch 0.9m (Dec. 20.30-33p3)
Observations of small asteroids (H>22.0)
K07X23V 2007 XV23 (Q=4.664 AU, arc=5 days, H=25.1 ~32m) from Astronomical Research Obs. (ARO) (Dec. 19.38p3)
K07V03H 2007 VH3 (arc=48 days, H=22.5 ~107m) from Desert Moon Obs. (Dec. 20.22-25p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K07X03Q 2007 XQ3 (arc=15 days, H=21.9 ~141m) from ARO (Dec. 19.39p3)
Observations of other objects
K07Y01M 2007 YM1 (arc=2 days, H=20.7 ~245m) from Young/Table Mtn. (Dec. 20.31-33p4)
K07Y01F 2007 YF1 (arc=5 days, H=18.6 ~645m) from ARO (Dec. 19.40p3) and KLENOT (Dec. 20.99-00p5)
K07Y00K 2007 YK (arc=5 days, H=17.4 ~1.12 km) from ARO (Dec. 19.46-47p3) and KLENOT (Dec. 21.06p7)
K07X16H 2007 XH16 (arc=12 days, H=19.5 ~426m) from Tiki Obs. (Dec. 18.32-40p5), Verona Obs. (Dec. 18.93p4), KLENOT (Dec. 20.92p6), and Schiaparelli Obs. (Dec. 20.00p5)
K07W55F 2007 WF55 (arc=18 days, H=19.1 ~513m) from Verona Obs. (Dec. 13.95p3 & 18.94-95p4) and New Millennium Obs. (Dec. 16.98-00p4)
K07U03W 2007 UW3 (arc=62 days, H=19.4 ~446m) from Desert Moon Obs. (Dec. 20.28-33p3)
K07T15G 2007 TG15 (arc=72 days, H=19.6 ~407m) from New Millennium Obs. (Dec. 16.77-80p6)
K07E00X 2007 EX (arc=2 opp, H=17.0 ~1.35 km) from Desert Moon Obs. (Dec. 19.49-51p3)
K06W01R 2006 WR1 (i=38.2°, arc=2 opp, H=17.7 ~977m) from Spacewatch 1.8m (Dec. 20.24-25p3)
K05X01D 2005 XD1 (arc=2 opp, H=19.2 ~490m) from New Millennium Obs. (Dec. 16.96-00p4) and Verona Obs. (Dec. 19.89-90p4)
K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from LINEAR (Dec. 20.42-47p5)
K05R00C 2005 RC (arc=4 opp, H=17.2 ~1.23 km) from Spacewatch 1.8m (Dec. 20.28p2)
K04X14M 2004 XM14 (i=42.4°, q=0.348 AU, arc=6 opp, H=17.6 ~1.02 km) from Bergen-Enkheim Obs. (Dec. 19.94p2 & 20.01-06p4)
K04A01R 2004 AR1 (arc=3 opp, H=19.8 ~371m) from Wildberg Obs. (Dec. 21.06p3)
K03X11F 2003 XF11 (q=0.331 AU, Q=4.055 AU, arc=3 opp, H=16.8 ~1.48 km) from Spacewatch 0.9m (Dec. 20.36-40p3)
K03W25L 2003 WL25 (Q=4.175 AU, arc=3 opp, H=16.7 ~1.55 km) from Spacewatch 0.9m (Dec. 20.19-23p3)
K03D14C 2003 DC14 (Q=4.511 AU, arc=3 opp, H=16.3 ~1.86 km) from Desert Moon Obs. (Dec. 20.49-54p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from New Millennium Obs. (Dec. 16.77-85p10) and Balzaretto Obs. (Dec. 19.91-93p4)
K03A73J 2003 AJ73 (arc=3 opp, H=18.6 ~645m) from Spacewatch 0.9m (Dec. 20.52-54p2)
K02T70C 2002 TC70 (arc=3 opp, H=21.1 ~204m) from Spacewatch 0.9m (Dec. 20.37-41p2)
K00C33L 2000 CL33 (arc=3 opp, H=18.4 ~708m) from Spacewatch 1.8m (Dec. 20.53-55p3)
J99R28Q 1999 RQ28 (arc=2 opp, H=20.7 ~245m) from Spacewatch 1.8m (Dec. 20.39-42p3)
J98Y04M 1998 YM4 (arc=2 opp, H=19.7 ~389m) from the Mt. Lemmon Survey (MLS) (Dec. 20.22-25p4)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from New Millennium Obs. (Dec. 16.95-02p6)
J91J00W 1991 JW (arc=5 opp, H=19.6 ~407m) from Spacewatch 0.9m (Dec. 20.53-55p3)
H2974 172974 2005 YW55 from the Catalina Sky Survey (CSS) (Dec. 15.21-23p4) and Petit Jean Mtn. South Obs. (PJMSO) (Dec. 19.08p2)
H2718 172718 2004 BD85 from Spacewatch 0.9m (Dec. 18.14-18p3)
H2678 172678 2003 YM137 from Spacewatch 0.9m (Dec. 16.13-17p3)
H1819 171819 2001 FZ6 from the SZTE Asteroid Program (SZTE) (Dec. 17.82-83p5)
F2942 152942 2000 FN10 from Desert Moon Obs. (Dec. 20.37-44p3)
E3404 143404 2003 BD44 from Spacewatch 0.9m (Dec. 20.37-41p3)
E0288 140288 2001 SN289 from Guidestar Obs. (Dec. 21.16-18p3)
D6793 136793 1997 AQ18 from Farra d'Isonzo Obs. (Dec. 21.00-01p2)
99935 99935 2002 AV4 from Crni Vrh Obs. (Dec. 19.74-77p4)
85804 85804 1998 WQ5 from New Millennium Obs. (Dec. 16.77-84p10)
66407 66407 1999 LQ28 from CSS (Dec. 20.41-43p4)
35107 35107 1991 VH from MLS (Dec. 20.51-52p4)
21374 21374 1997 WS22 from New Millennium Obs. (Dec. 16.77-80p6)
18736 18736 1998 NU from New Millennium Obs. (Dec. 16.78-85p8)
07092 7092 Cadmus (1992 LC) from CSS (Dec. 21.07-09p4)
04450 4450 Pan (1987 SY) from LINEAR (Dec. 20.33-38p5)
01685 1685 Toro (1948 OA) from CSS (Dec. 20.06-07p4)

Observers on 21 December '07

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

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2007-Y40 -- 2007 YK, 2007 YF1, 2007 XV23, 2007 XQ3
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2007-Y40 -- 2003 BH84
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2007-Y40 -- 2004 XM14
`621`	Bergisch Gladbach Obs. in Germany, 1 in MPEC 2007-Y40 -- 2007 YN1
`703`	Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2007-Y40 -- 66407, 172974, 7092, 1685
`106`	Crni Vrh Obs. in Slovenia, 1 in MPEC 2007-Y40 -- 99935
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2007-Y40 -- 2007 VH3, 2007 UW3, 2007 EX, 2003 DC14, 152942
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2007-Y40 -- 136793
`A17`	Guidestar Obs. in Germany, 1 in MPEC 2007-Y40 -- 140288
`246`	KLENOT in the Czech Republic, 5 in MPEC 2007-Y40 -- 2007 YZ, 2007 YK, 2007 YF1, 2007 YB2, 2007 XH16
`704`	LINEAR in New Mexico, 2 in MPEC 2007-Y40 -- 2005 WJ56, 4450
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2007-Y40 -- 1998 YM4, 35107
`A24`	New Millennium Obs. in Italy, 8 in MPEC 2007-Y40 -- 2007 WF55, 2007 TG15, 2005 XD1, 2003 BH84, 1993 TQ2, 85804, 21374, 18736
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2007-Y40 -- 172974
`461`	SZTE Asteroid Program in Hungary, 1 in MPEC 2007-Y40 -- 171819
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2007-Y40 -- 2007 XH16
`691`	Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2007-Y40 -- 2007 YG, 2007 XP3, 2007 XD10, 2003 XF11, 2003 WL25, 2003 AJ73, 2002 TC70, 1991 JW, 172718, 172678, 143404
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2007-Y40 -- 2007 YN1, 2007 YB2, 2007 XJ16, 2007 XD10, 2006 WR1, 2005 RC, 2000 CL33, 1999 RQ28
`6735`	Jim Young via Table Mtn. Obs. in southern California, 2 in MPEC 2007-Y40 -- 2007 YM1, 2007 YB2
`F85`	Tiki Obs. in Tahiti, 1 in MPEC 2007-Y40 -- 2007 XH16
`A48`	Verona Obs. in Italy, 3 in MPEC 2007-Y40 -- 2007 XH16, 2007 WF55, 2005 XD1
`198`	Wildberg Obs. in Germany, 2 in MPEC 2007-Y40 -- 2007 YB2, 2004 AR1

Impact Risk Monitoring on 21 December '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2353 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	NEODyS	1355	2030-2057	9	2.9e-08	-4.02	-4.39	0	NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/21.079."
2007 YB2	JPL Sentry	1354	2029-2106	31	8.2e-08	-3.65	-4.31	0	JPL: "Analysis based on 38 observations spanning 2.7326 days (2007-Dec-18.34552 to 2007-Dec-21.07811)." Diameter approximately 0.816 km. from mean, weighted H=18.1.

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 21 December '07

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

1355	Noted that NEODyS has updated its 2007 YB2 risk assessment - see above Grabbed MPEC 2007-Y40 - Daily Orbit Update - see above
1354	Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above

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