7 Dec '07 Tracking News

Contents on 7 December '07

IAU Minor Planet Center
- NEOCP Activity -- six listings: 3 new, 3 updated
- New MPECs -- four MPECs
- Observers -- seventeen observing facilities
Impact Risk Monitoring -- seven 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 news: framed access (best), RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 7 December '07

The MPC's NEO Confirmation Page has 6 listings: 3 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and three updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of seven 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 7 December '07

Minor Planet Electronic Circulars

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

MPEC 2007-X34 time-stamped "07:09 UT" - Daily Orbit Update - see below
MPEC 2007-X35 time-stamped "17:28 UT" - 2007 XK11 - see below
MPEC 2007-X36 time-stamped "18:34 UT" - 1998 YM4 - see below
MPEC 2007-X37 time-stamped "21:53 UT" - Comet C/2007 D3 (LINEAR)

MPEC 2007-X37 - "21:53 UT" - Comet C/2007 D3 (LINEAR)

CK07D030 C/2007 D3 (LINEAR) (i=45.9°, q=5.209 AU, Q=1289.684 AU, TP=2007 May 27.76954 TT) from Ageo Obs. (Dec. 1.83p1, 5.79p1 & 7.73-74p2)

MPEC 2007-X36 - "18:34 UT" - 1998 YM4

J98Y04M 1998 YM4 (H=19.7 ~389m) from the Catalina Sky Survey (CSS) (Dec. 6.39-50p12) and Astronomical Research Obs. (ARO) (Dec. 6.45-46p3)

MPEC 2007-X35 - "17:28 UT" - 2007 XK11

K07X11K 2007 XK11 (risk-listed, Q=4.513 AU, H=18.9 ~562m) was discovered at 0207 UT on 6 Dec. by the CSS, which observed it at Dec. 6.09-14p8, 6.24-25p4, and 6.31p4. The discovery was confirmed by ARO (Dec. 6.15-16p3), Grasslands Obs. (Dec. 6.22p3), and San Marcello Pistoiese Obs. (Dec. 6.76-77p3).

<< DOU on 7 Dec. '07 >> MPEC 2007-X34 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X10D 2007 XD10 (arc=1 day, H=20.7 ~245m) from ARO (Dec. 6.36-37p3)
K07X09Z 2007 XZ9 (small asteroid, arc=2 days, H=24.8 ~37m) from ARO (Dec. 6.22p3)
K07VI4K 2007 VK184 (almost small, arc=24 days, H=22.0 ~135m) from the Mt. Lemmon Survey (MLS) (Dec. 6.23-25p4)
Observations of recently (no longer) risk-listed objects
K07V08J 2007 VJ8 (small asteroid, Q=4.527 AU, arc=30 days, H=24.9 ~35m) from the Spacewatch 0.9m telescope (Dec. 4.17-20p3)
Observations of small asteroids (H>22.0)
K07X10A 2007 XA10 (arc=2 days, H=22.9 ~89m) from ARO (Dec. 6.33-35p6)
K07W05D 2007 WD5 (Q=4.029 AU, arc=15 days, H=24.3 ~47m) from the Spacewatch 1.8m telescope (Dec. 4.22p1)
K07V83W 2007 VW83 (arc=23 days, H=24.1 ~51m) from ARO (Nov. 30.06p1)
Observations of other objects
K07X10C 2007 XC10 (i=48.8°, arc=1 day, H=19.3 ~467m) from ARO (Dec. 6.27-28p3), Junk Bond Obs. (Dec. 6.40-45p3), and San Marcello Pistoiese Obs. (Dec. 6.78p3)
K07VI4M 2007 VM184 (arc=22 days, H=21.0 ~214m) from Lumezzane Obs. (Dec. 4.75-76p4)
K07VI3R 2007 VR183 (Q=4.353 AU, arc=82 days, H=17.3 ~1.17 km) from Lumezzane Obs. (Dec. 5.00-01p4)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 6.07-08p6) and CSS (Dec. 6.15-17p4)
K07T15G 2007 TG15 (arc=59 days, H=19.6 ~407m) from PJMSO (Dec. 6.06-07p6)
K07S06P 2007 SP6 (arc=76 days, H=18.2 ~776m) from PJMSO (Dec. 6.31-32p3)
K07R12U 2007 RU12 (arc=85 days, H=20.0 ~339m) from Spacewatch 0.9m (Dec. 6.08-11p3)
K05YC8Y 2005 YY128 (arc=3 opp, H=18.3 ~741m) from Spacewatch 0.9m (Dec. 4.51-54p3)
K05Y55W 2005 YW55 (arc=4 opp, H=19.3 ~467m) from Crni Vrh Obs. (Dec. 6.02-05p4)
K05X01D 2005 XD1 (arc=2 opp, H=19.2 ~490m) from Lumezzane Obs. (Dec. 5.08-09p3)
K03YD7M 2003 YM137 (Q=4.390 AU, arc=3 opp, H=18.7 ~616m) from Spacewatch 0.9m (Dec. 4.16-20p2)
K03W25L 2003 WL25 (Q=4.175 AU, arc=3 opp, H=16.7 ~1.55 km) from Spacewatch 0.9m (Dec. 5.17-19p2)
K03U22D 2003 UD22 (arc=2 opp, H=19.7 ~389m) from Spacewatch 0.9m (Dec. 6.41-45p3)
K03K18R 2003 KR18 (arc=3 opp, H=17.9 ~891m) from Spacewatch 0.9m (Dec. 6.42-44p2)
K03B84H 2003 BH84 (arc=2 opp, H=16.8 ~1.48 km) from Hamamatsu-Yuto Obs. (Dec. 6.54-58p8)
K01W01R 2001 WR1 (arc=5 opp, H=17.8 ~933m) from CSS (Dec. 6.51-52p4)
J99R33H 1999 RH33 (arc=5 opp, H=19.5 ~426m) from CSS (Dec. 6.22-24p4)
J99A10Q 1999 AQ10 (arc=3 opp, H=20.3 ~295m) from PJMSO (Dec. 6.04-06p6)
J96T11Y 1996 TY11 (arc=6 opp, H=19.4 ~446m) from Lumezzane Obs. (Dec. 4.99-00p4)
H0891 170891 2004 TY16 from PJMSO (Dec. 6.30-31p5)
H0502 170502 2003 WM7 from Lumezzane Obs. (Dec. 4.83-84p3)
G2004 162004 1991 VE from MLS (Dec. 6.23-25p4)
F5340 155340 2006 SK198 from Spacewatch 0.9m (Dec. 6.40-44p3)
F2742 152742 1998 XE12 from Lumezzane Obs. (Dec. 4.84-85p4)
D8947 138947 2001 BA40 from Spacewatch 0.9m (Dec. 5.34-37p3)
99907 99907 1989 VA from CSS (Dec. 6.06-08p4)
90403 90403 2003 YE45 from LINEAR (Dec. 3.38-43p4)
68359 68359 2001 OZ13 from Lumezzane Obs. (Dec. 5.15-16p4) and PJMSO (Dec. 6.28-30p5)
68063 68063 2000 YJ66 from Spacewatch 0.9m (Dec. 5.44-47p3)
25916 25916 2001 CP44 from LINEAR (Dec. 6.34-37p3)
21374 21374 1997 WS22 from PJMSO (Dec. 6.08p5)
10563 10563 Izhdubar (1993 WD) from the Siding Spring Survey (SSS) (Dec. 5.50-53p4)
09172 9172 Abhramu (1989 OB) from LINEAR (Dec. 6.35-40p5) and MLS (Dec. 6.41-43p4)
07839 7839 1994 ND from Spacewatch 0.9m (Dec. 6.41-45p3)
05620 5620 Jasonwheeler (1990 OA) from Spacewatch 0.9m (Dec. 6.41-44p3)
04450 4450 Pan (1987 SY) from LINEAR (Dec. 6.41-46p5)
03671 3671 Dionysus (1984 KD) from CSS (Dec. 6.18-20p4)
03553 3553 Mera (1985 JA) from Crni Vrh Obs. (Dec. 5.90-93p4)
03200 3200 Phaethon (1983 TB) from Chante-Perdrix Obs. (Dec. 5.23-24p20)
01862 1862 Apollo (1932 HA) from CSS (Dec. 6.37-39p4)
01685 1685 Toro (1948 OA) from Montana Blanca Obs. (Dec. 6.83-84p3)
01620 1620 Geographos (1951 RA) from CSS (Dec. 6.48-50p4)

Observers on 7 December '07

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`349`	Ageo Obs. in Japan, 1 in MPEC 2007-X37 -- C/2007 D3
`H55`	Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2007-X34, 2007-X35 & 2007-X36 -- 2007 XZ9, 2007 XK11, 2007 XD10, 2007 XC10, 2007 XA10, 2007 VW83, 1998 YM4
`703`	Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2007-X34, 2007-X35 & 2007-X36 -- 2007 XK11, 2007 US6, 2001 WR1, 1999 RH33, 1998 YM4, 99907, 3671, 1862, 1620
`A77`	Chante-Perdrix Obs. in France, 1 in MPEC 2007-X34 -- 3200
`106`	Crni Vrh Obs. in Slovenia, 2 in MPEC 2007-X34 -- 2005 YW55, 3553
`651`	Grasslands Obs. in Arizona, 1 in MPEC 2007-X35 -- 2007 XK11
`379`	Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2007-X34 -- 2003 BH84
`701`	Junk Bond Obs. in Arizona, 1 in MPEC 2007-X34 -- 2007 XC10
`704`	LINEAR in New Mexico, 4 in MPEC 2007-X34 -- 90403, 25916, 9172, 4450
`130`	Lumezzane Obs. in Italy, 7 in MPEC 2007-X34 -- 2007 VR183, 2007 VM184, 2005 XD1, 1996 TY11, 68359, 170502, 152742
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X34 -- 1685
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2007-X34 -- 2007 VK184, 162004, 9172
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2007-X34 -- 2007 US6, 2007 TG15, 2007 SP6, 1999 AQ10, 68359, 21374, 170891
`104`	San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2007-X34 & 2007-X35 -- 2007 XK11, 2007 XC10
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-X34 -- 10563
`691`	Spacewatch 0.9m telescope in Arizona, 12 in MPEC 2007-X34 -- 2007 VJ8, 2007 RU12, 2005 YY128, 2003 YM137, 2003 WL25, 2003 UD22, 2003 KR18, 68063, 155340, 138947, 7839, 5620
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2007-X34 -- 2007 WD5

Impact Risk Monitoring on 7 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	2354	2011-2107	89	5.2e-07	-3.06	-3.38	0	JPL: "Analysis based on 25 observations spanning .67991 days (2007-Dec-06.0886 to 2007-Dec-06.76851)." Diameter approximately 0.538 km. from mean, weighted H=19.0.

2007 XD10	NEODyS	1701	2010-2090	311	8.91e-08	-4.20	-4.74	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2007/12/05.444 to 2007/12/06.369."
2007 XD10	JPL Sentry	1345	2010-2107	105	7.3e-08	-4.29	-4.50	0	JPL: "Analysis based on 11 observations spanning .92495 days (2007-Dec-05.44337 to 2007-Dec-06.368319)." Diameter approximately 0.250 km. from mean, weighted H=20.6.

2007 XB10	NEODyS	1346	2011-2083	16	4.92e-10	-4.52	-4.80	0	NEODyS: "Based on 14 optical observations (of which 1 are rejected as outliers) from 2007/12/05.167 to 2007/12/06.314."

2007 XZ9	NEODyS	1346	2056-2089	4	1.56e-06	-5.73	-6.08	0	NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/06.299."
2007 XZ9	JPL Sentry	1345	2056-2089	3	1.4e-06	-5.78	-6.06	0	JPL: "Analysis based on 31 observations spanning 2.1041 days (2007-Dec-04.19408 to 2007-Dec-06.29819)." Diameter approximately 0.037 km. from mean, weighted H=24.8.

2007 XP3	JPL Sentry	2354	2027-2106	13	2.0e-09	-4.83	-5.64	0	JPL: "Analysis based on 11 observations spanning 1.0459 days (2007-Dec-04.38257 to 2007-Dec-05.42847)." Diameter approximately 0.723 km. from mean, weighted H=18.4.

2007 WY3	JPL Sentry	0132	2101	1	1.8e-07	-3.49	-3.49	0	JPL: "Analysis based on 37 observations spanning 16.888 days (2007-Nov-18.44048 to 2007-Dec-05.32828)." Diameter approximately 0.770 km. from mean, weighted H=18.2.

2007 VK184	NEODyS	1346	2036-2069	22	7.75e-05	-2.48	-2.49	0	NEODyS: "Based on 87 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/12/06.253."
2007 VK184	JPL Sentry	1345	2046-2062	13	7.9e-05	-2.47	-2.48	0	JPL: "Analysis based on 87 observations spanning 24.113 days (2007-Nov-12.13904 to 2007-Dec-06.2525)." Diameter approximately 0.130 km. from mean, weighted H=22.0.

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 7 December '07

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

2354	Noted that JPL Sentry has posted 2007 XK11 as an impact risk - see above Noted that JPL Sentry has posted 2007 XP3 as an impact risk - see above Grabbed MPEC 2007-X37 - Comet C/2007 D3 (LINEAR) - see above
1903	Grabbed MPEC 2007-X36 - 1998 YM4 - see above
1758	Grabbed MPEC 2007-X35 - 2007 XK11 - see above
1700	Noted that NEODyS has posted 2007 XD10 as an impact risk - see above
1346	Noted that NEODyS has updated its 2007 VK184 risk assessment - see above Grabbed MPEC 2007-X34 - Daily Orbit Update - see above
1345	Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above Noted that NEODyS has posted 2007 XB10 as an impact risk - see above Noted that JPL Sentry has updated its 2007 XD10 risk assessment - see above Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above Noted that NEODyS has posted 2007 XZ9 as an impact risk - see above
0132	Noted that JPL Sentry has updated its 2007 WY3 risk assessment - see above

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