2007-12-20 Tracking News

Contents on 20 December '07

IAU Minor Planet Center
- NEOCP Activity -- seven listings: 3 new, 4 updated
- New MPECs -- seven MPECs
- Observers -- nineteen observing facilities
Impact Risk Monitoring -- four 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 20 December '07

The MPC's NEO Confirmation Page has 7 listings: 3 new, 4 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and four updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of ten 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 20 December '07

Minor Planet Electronic Circulars

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

MPEC 2007-Y33 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2007-Y34 time-stamped "14:44 UT" - Observable Comets - see below
MPEC 2007-Y35 time-stamped "15:11 UT" - Distant Minor Planets - see below
MPEC 2007-Y36 time-stamped "15:16 UT" - Atens and Apollos - see below
MPEC 2007-Y37 time-stamped "15:16 UT" - Amors - see below
MPEC 2007-Y38 time-stamped "15:16 UT" - Unusual Minor Planets - see below
MPEC 2007-Y39 time-stamped "15:16 UT" - PHAs

MPEC 2007-Y39 - "15:16 UT" - PHAs

MPEC 2007-Y38 - "15:16 UT" - Unusual Minor Planets

MPEC 2007-Y37 - "15:16 UT" - Amors

MPEC 2007-Y36 - "15:16 UT" - Atens and Apollos

MPEC 2007-Y35 - "15:11 UT" - Distant Minor Planets

MPEC 2007-Y34 - "14:44 UT" - Observable Comets

<< DOU on 20 Dec. '07 >> MPEC 2007-Y33 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y02B 2007 YB2 (Q=4.483 AU, arc=1 day, H=18.1 ~812m) from Astronomical Research Obs. (ARO) (Dec. 19.45p3)
K07Y01N 2007 YN1 (small asteroid, Q=4.597 AU, arc=2 days, H=24.9 ~35m) from Guidestar Obs. (Dec. 20.09-13p4)
K07Y00F 2007 YF (small asteroid, arc=2 days, H=24.8 ~37m) from ARO (Dec. 18.03-04p3)
K07X11K 2007 XK11 (Q=4.460 AU, arc=13 days, H=19.2 ~490m) from McDonald Obs. (Dec. 19.16-17p2)
Observations of recently (no longer) risk-listed objects
K07Y00Z 2007 YZ (arc=2 days, H=19.9 ~355m) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 19.27-28p7)
K07Y00G 2007 YG (small asteroid, arc=3 days, H=23.1 ~81m) from the Spacewatch 0.9m telescope (Dec. 19.13-16p3)
K07X25F 2007 XF25 (arc=4 days, H=21.2 ~195m) from PJMSO (Dec. 19.29-30p5), Spacewatch 0.9m (Dec. 19.40-44p3), and Desert Moon Obs. (Dec. 19.43-47p3)
K07X10B 2007 XB10 (i=42.1°, arc=14 days, H=17.4 ~1.12 km) from Tim Spahr via Whipple Obs. (Dec. 16.20-22p2) and Spacewatch 0.9m (Dec. 19.13-15p3)
K07W03V 2007 WV3 (arc=31 days, H=19.7 ~389m) from PJMSO (Dec. 19.36-37p3)
Observations of small asteroids (H>22.0)
K07W05D 2007 WD5 (Q=4.038 AU, arc=29 days, H=24.3 ~47m) from Magdalena Ridge Obs. (MRO) (Dec. 19.15-22p8 at R=22.1-4)
K07VJ1F 2007 VF191 (arc=31 days, H=22.4 ~112m) from Spahr/Whipple (Dec. 16.17-18p2)
K07T01G 2007 TG1 (arc=76 days, H=24.4 ~45m) from the Spacewatch 1.8m telescope (Dec. 19.30-34p6)
Observations of almost-small asteroids (21.7<H<=22.0)
K07VI4H 2007 VH184 (Q=4.093 AU, arc=38 days, H=21.9 ~141m) from Desert Moon Obs. (Dec. 19.33-39p3)
Observations of other objects
K07Y01X 2007 YX1 (Q=4.534 AU, arc=59 days, H=17.1 ~1.29 km) from ARO (Dec. 18.00-01p3)
K07Y01F 2007 YF1 (arc=3 days, H=18.6 ~645m) from PJMSO (Dec. 19.34-35p7)
K07Y00K 2007 YK (arc=3 days, H=17.4 ~1.12 km) from PJMSO (Dec. 19.37-39p3)
K07Y00H 2007 YH (arc=4 days, H=20.0 ~339m) from Capannoli Obs. (Dec. 19.99-00p5)
K07X20J 2007 XJ20 (arc=3 days, H=18.3 ~741m) from Spahr/Whipple (Dec. 16.16-17p2)
K07X16H 2007 XH16 (arc=11 days, H=19.4 ~446m) from AAAA Buenos Aires Obs. (Dec. 15.14-18p4) and Tiki Obs. (Dec. 19.57-59p4)
K07X10C 2007 XC10 (i=48.0°, arc=14 days, H=19.4 ~446m) from Desert Moon Obs. (Dec. 19.19-22p3)
K07X09Y 2007 XY9 (arc=15 days, H=21.0 ~214m) from Desert Moon Obs. (Dec. 19.15-17p3)
K07X03N 2007 XN3 (Q=4.145 AU, arc=16 days, H=20.5 ~269m) from ARO (Dec. 19.04-05p3)
K07W55F 2007 WF55 (arc=18 days, H=19.1 ~513m) from LINEAR (Dec. 19.20-25p4)
K07W04W 2007 WW4 (arc=29 days, H=19.5 ~426m) from ARO (Dec. 19.09p3)
K07W04U 2007 WU4 (arc=30 days, H=18.8 ~589m) from Spacewatch 1.8m (Dec. 19.11-13p3)
K07W00B 2007 WB (arc=32 days, H=18.8 ~589m) from Spahr/Whipple (Dec. 16.24-26p2)
K07VI3R 2007 VR183 (Q=4.353 AU, arc=96 days, H=17.3 ~1.17 km) from ARO (Dec. 19.10-11p3)
K07V07X 2007 VX7 (arc=45 days, H=19.5 ~426m) from ARO (Dec. 19.06-07p3)
K07V04Q 2007 VQ4 (arc=46 days, H=15.8 ~2.34 km, q=1.271 AU) from LINEAR (Dec. 19.38-43p5)
K07T15G 2007 TG15 (arc=72 days, H=19.6 ~407m) from McDonald Obs. (Dec. 19.18-19p3)
K07S06P 2007 SP6 (arc=89 days, H=18.2 ~776m) from PJMSO (Dec. 18.43-44p6 & 19.32p5), LINEAR (Dec. 19.28-32p4), and Capannoli Obs. (Dec. 19.95-96p2)
K07R09A 2007 RA9 (Q=4.127 AU, arc=100 days, H=19.8 ~371m) from ARO (Dec. 19.11-13p3)
K07Q03E 2007 QE3 (Q=4.045 AU, arc=118 days, H=19.9 ~355m) from Spacewatch 0.9m (Dec. 18.52-54p3)
K07O03G 2007 OG3 (arc=153 days, H=18.4 ~708m) from Spacewatch 0.9m (Dec. 19.28-32p3)
K07N04S 2007 NS4 (arc=155 days, H=18.9 ~562m) from Spahr/Whipple (Dec. 16.52p2)
K07G03S 2007 GS3 (arc=2 opp, H=19.4 ~446m) from the Catalina Sky Survey (CSS) (Dec. 19.26-28p4)
K07E88H 2007 EH88 (arc=3 opp, H=19.8 ~371m) from Bergen-Enkheim Obs. (Dec. 19.06-11p5) and PJMSO (Dec. 19.42-44p6)
K06W01X 2006 WX1 (arc=2 opp, H=19.6 ~407m) from ARO (Dec. 14.43-44p3 & 19.46-47p3)
K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from PJMSO (Dec. 19.40-41p6)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from PJMSO (Dec. 19.33-34p5)
K05EM5J 2005 EJ225 (arc=4 opp, H=18.9 ~562m) from Spacewatch 1.8m (Dec. 20.08-09p3)
K04N09C 2004 NC9 (Q=4.194 AU, arc=3 opp, H=17.1 ~1.29 km) from Spahr/Whipple (Dec. 16.38-41p2)
K04F04U 2004 FU4 (arc=2 opp, H=18.5 ~676m) from Spacewatch 1.8m (Dec. 19.07-08p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from San Vito Obs. (Dec. 19.84-85p3)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.0 ~537m) from Atlante Obs. (Dec. 19.92-93p3) and Capannoli Obs. (Dec. 19.96-98p6)
K02A09E 2002 AE9 (i=37.9°, arc=4 opp, H=18.9 ~562m) from Spacewatch 1.8m (Dec. 19.40-41p3)
J99R45M 1999 RM45 (arc=3 opp, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 19.48-50p2)
J98Y04M 1998 YM4 (arc=2 opp, H=19.7 ~389m) from the Mt. Lemmon Survey (MLS) (Dec. 19.32-33p4)
J94A01W 1994 AW1 (arc=3 opp, H=17.5 ~1.07 km) from PJMSO (Dec. 19.42p5)
H0891 170891 2004 TY16 from Wildberg Obs. (Nov. 16.90-91p2)
F4347 154347 2002 XK4 from PJMSO (Dec. 19.45-46p5)
F3591 153591 2001 SN263 from PJMSO (Dec. 19.08-09p5)
F3415 153415 2001 QP153 from Desert Moon Obs. (Dec. 19.53p3)
E4411 144411 2004 EW9 from Spacewatch 0.9m (Dec. 18.19-21p2)
E0288 140288 2001 SN289 from Guidestar Obs. (Dec. 20.15-17p3)
D8947 138947 2001 BA40 from Spacewatch 0.9m (Dec. 19.35-39p3)
85628 85628 1998 KV2 from Spacewatch 0.9m (Dec. 18.52-55p3)
25916 25916 2001 CP44 from Spacewatch 0.9m (Dec. 19.40-44p3)
05131 5131 1990 BG from Atlante Obs. (Dec. 19.95-96p3)
03691 3691 Bede (1982 FT) from PJMSO (Dec. 19.46p5)
01620 1620 Geographos (1951 RA) from PJMSO (Dec. 19.39p5) and LINEAR (Dec. 19.39-44p5)

Observers on 20 December '07

Nineteen observing facilities appear in today's MPEC.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2007-Y33 -- 2007 XH16
`H55`	Astronomical Research Obs. (ARO) in Illinois, 9 in MPEC 2007-Y33 -- 2007 YX1, 2007 YF, 2007 YB2, 2007 XN3, 2007 WW4, 2007 VX7, 2007 VR183, 2007 RA9, 2006 WX1
`J51`	Atlante Obs. in the Canary Islands, 2 in MPEC 2007-Y33 -- 2002 XY4, 5131
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2007-Y33 -- 2007 EH88
`B09`	Capannoli Obs. in Italy, 3 in MPEC 2007-Y33 -- 2007 YH, 2007 SP6, 2002 XY4
`703`	Catalina Sky Survey in Arizona, 1 in MPEC 2007-Y33 -- 2007 GS3
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2007-Y33 -- 2007 XY9, 2007 XF25, 2007 XC10, 2007 VH184, 153415
`A17`	Guidestar Obs. in Germany, 2 in MPEC 2007-Y33 -- 2007 YN1, 140288
`704`	LINEAR in New Mexico, 4 in MPEC 2007-Y33 -- 2007 WF55, 2007 VQ4, 2007 SP6, 1620
`H01`	Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2007-Y33 -- 2007 WD5
`711`	McDonald Obs. in Texas, 2 in MPEC 2007-Y33 -- 2007 XK11, 2007 TG15
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2007-Y33 -- 1998 YM4
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2007-Y33 -- 2007 YZ, 2007 YK, 2007 YF1, 2007 XF25, 2007 WV3, 2007 SP6, 2007 EH88, 2005 WJ56, 2005 TU45, 1994 AW1, 154347, 153591, 3691, 1620
`233`	San Vito Obs. in Italy, 1 in MPEC 2007-Y33 -- 2003 BH84
`691`	Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2007-Y33 -- 2007 YG, 2007 XF25, 2007 XB10, 2007 QE3, 2007 OG3, 85628, 25916, 144411, 138947
`291`	Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2007-Y33 -- 2007 WU4, 2007 TG1, 2005 EJ225, 2004 FU4, 2002 AE9, 1999 RM45
`F85`	Tiki Obs. in Tahiti, 1 in MPEC 2007-Y33 -- 2007 XH16
`6967`	Tim Spahr via Whipple Obs. in Arizona, 6 in MPEC 2007-Y33 -- 2007 XJ20, 2007 XB10, 2007 WB, 2007 VF191, 2007 NS4, 2004 NC9
`198`	Wildberg Obs. in Germany, 1 in MPEC 2007-Y33 -- 170891

Impact Risk Monitoring on 20 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	1408	2016-2106	115	1.2e-07	-3.23	-4.22	0	JPL: "Analysis based on 18 observations spanning 1.1144 days (2007-Dec-18.34552 to 2007-Dec-19.45988)." Diameter approximately 0.857 km. from mean, weighted H=18.0.
2007 YB2	NEODyS	1408	2026-2089	10	1.79e-08	-4.07	-4.48	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/19.461."

2007 YN1	NEODyS	1408	R E M O V E D

2007 YF	JPL Sentry	1408	R E M O V E D						JPL: Risk listing removed at 1325 UTC.

2007 XK11	JPL Sentry	1522	2064-2101	2	1.1e-07	-4.32	-4.38	0	JPL: "Analysis based on 46 observations spanning 13.079 days (2007-Dec-06.0886 to 2007-Dec-19.16764)." Diameter approximately 0.495 km. from mean, weighted H=19.2.
2007 XK11	NEODyS	1408	2064	1	8.62e-08	-4.37	-4.37	0	NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2007/12/06.089 to 2007/12/19.168."

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 20 December '07

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

1558	Grabbed MPEC 2007-Y37 - Amors - see above Grabbed MPEC 2007-Y38 - Unusual Minor Planets - see above Grabbed MPEC 2007-Y39 - PHAs - see above
1522	Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above Grabbed MPEC 2007-Y34 - Observable Comets - see above Grabbed MPEC 2007-Y35 - Distant Minor Planets - see above Grabbed MPEC 2007-Y36 - Atens and Apollos - see above
1408	Noted that NEODyS has updated its 2007 XK11 risk assessment - see above Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above Noted that NEODyS has posted 2007 YB2 as an impact risk - see above Noted that JPL Sentry has removed 2007 YF as an impact risk - see above Noted that NEODyS has removed 2007 YN1 as an impact risk - see above Grabbed MPEC 2007-Y33 - Daily Orbit Update - see above

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