2007-12-14 Tracking News

Contents on 14 December '07

IAU Minor Planet Center
- NEOCP Activity -- five listings: 5 new
- New MPECs -- three MPECs
- Observers -- twelve 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 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 14 December '07

The MPC's NEO Confirmation Page has 5 listings: 5 new

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five new listings. Of these, four 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 14 December '07

Minor Planet Electronic Circulars

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

MPEC 2007-X56 time-stamped "07:11 UT" - Daily Orbit Update - see below
MPEC 2007-X57 time-stamped "14:06 UT" - 2007 XJ20 - see below
MPEC 2007-X58 time-stamped "17:54 UT" - 2006 NM

MPEC 2007-X58 - "17:54 UT" - 2006 NM

K06N00M 2006 NM (Q=4.498 AU, H=16.3 ~1.86 km) from Astronomical Research Obs. (ARO) (Dec. 6.38-41p3 at V=22.3-4 & 14.39-41p3 at V=22.3-4)

MPEC 2007-X57 - "14:06 UT" - 2007 XJ20

K07X20J 2007 XJ20 (H=18.6 ~645m) was discovered at 0627 UT on 13 Dec. by LINEAR, which observed it at Dec. 13.27-31p4. The discovery was confirmed by Schiaparelli Obs. (Dec. 14.02-05p2) and Heath Rhoades via Table Mtn. Obs. (Dec. 14.28-29p4).

<< DOU on 14 Dec. '07 >> MPEC 2007-X56 - "07:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X11K 2007 XK11 (Q=4.526 AU, arc=7 days, H=19.2 ~490m) from Desert Moon Obs. (Dec. 13.16-18p3)
Observations of recently (no longer) risk-listed objects
K07W04V 2007 WV4 (i=38.3°, arc=24 days, H=19.2 ~490m) from Desert Moon Obs. (Dec. 13.29-30p3)
K07W03V 2007 WV3 (arc=25 days, H=19.6 ~407m) from Desert Moon Obs. (Dec. 13.37-41p3)
Observations of other objects
K07X16H 2007 XH16 (arc=4 days, H=19.4 ~446m) from the Siding Spring Survey (SSS) (Dec. 12.47p1 & 12.74p1)
K07X10C 2007 XC10 (i=48.1°, arc=8 days, H=19.4 ~446m) from Desert Moon Obs. (Dec. 13.32-34p3)
K07X09Y 2007 XY9 (arc=9 days, H=21.0 ~214m) from Desert Moon Obs. (Dec. 13.19-21p3)
K07W55F 2007 WF55 (arc=13 days, H=19.0 ~537m) from Capannoli Obs. (Dec. 13.93-94p4)
K07VI4G 2007 VG184 (arc=32 days, H=17.3 ~1.17 km) from Desert Moon Obs. (Dec. 13.10-13p3)
K07V04Q 2007 VQ4 (arc=41 days, H=15.9 ~2.24 km, q=1.271 AU) from Paus Obs. (Dec. 13.99-00p2)
K07U06B 2007 UB6 (arc=55 days, H=19.7 ~389m) from LINEAR (Dec. 13.19-23p4)
K07T71D 2007 TD71 (i=49.8°, arc=61 days, H=18.5 ~676m) from the Spacewatch 1.8m telescope (Dec. 14.09-10p3)
K07T15G 2007 TG15 (arc=67 days, H=19.6 ~407m) from Capannoli Obs. (Dec. 13.99p3)
K07R12U 2007 RU12 (arc=92 days, H=20.0 ~339m) from LINEAR (Dec. 13.20-25p5)
K07M13K 2007 MK13 (arc=175 days, H=20.0 ~339m) from Spacewatch 1.8m (Dec. 13.54-55p2)
K06UL6S 2006 US216 (IEO, q=0.278 AU, Q=0.995 AU, arc=3 opp, H=19.8 ~371m) from SSS (Dec. 13.48-49p2)
K05G59E 2005 GE59 (arc=3 opp, H=18.1 ~812m) from Desert Moon Obs. (Dec. 13.47p1 & 13.52p1)
K04B85D 2004 BD85 (arc=4 opp, H=18.7 ~616m) from LINEAR (Dec. 13.27-31p4)
K03W25M 2003 WM25 (Q=4.100 AU, arc=2 opp, H=17.6 ~1.02 km) from Desert Moon Obs. (Dec. 13.06-08p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from Saint-Barthelemy Obs. (Dec. 12.84-88p5)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.0 ~537m) from LINEAR (Dec. 13.32-37p5)
J98Q15R 1998 QR15 (Q=4.315 AU, arc=3 opp, H=18.1 ~812m) from Spacewatch 1.8m (Dec. 14.08-09p3)
F3201 153201 2000 WO107 from LINEAR (Dec. 13.26-31p5)
E4411 144411 2004 EW9 from LINEAR (Dec. 13.26-31p4)
86324 86324 1999 WA2 from La Fecha Obs. (Nov. 28.90p1, 29.02p1 & Dec. 4.00p1)
68063 68063 2000 YJ66 from LINEAR (Dec. 13.33-38p5)
66407 66407 1999 LQ28 from Desert Moon Obs. (Dec. 13.43-44p5)
34613 34613 2000 UR13 from LINEAR (Dec. 13.33-38p5)
31346 31346 1998 PB1 from LINEAR (Dec. 13.21-25p4)
21374 21374 1997 WS22 from Capannoli Obs. (Dec. 13.99p2)
18736 18736 1998 NU from LINEAR (Dec. 13.20-25p5)
09400 9400 1994 TW1 from LINEAR (Dec. 13.49-51p3)
05131 5131 1990 BG from Purple Mtn. Obs. XuYi Station (Dec. 13.70-74p4)

Observers on 14 December '07

Twelve observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. in Illinois, 1 in MPEC 2007-X58 -- 2006 NM
`B09`	Capannoli Obs. in Italy, 3 in MPEC 2007-X56 -- 2007 WF55, 2007 TG15, 21374
`448`	Desert Moon Obs. in New Mexico, 9 in MPEC 2007-X56 -- 2007 XY9, 2007 XK11, 2007 XC10, 2007 WV4, 2007 WV3, 2007 VG184, 2005 GE59, 2003 WM25, 66407
`704`	LINEAR in New Mexico, 12 in MPECs 2007-X56 & 2007-X57 -- 2007 XJ20, 2007 UB6, 2007 RU12, 2004 BD85, 2002 XY4, 68063, 34613, 31346, 18736, 153201, 144411, 9400
`J34`	La Fecha Obs., 1 in MPEC 2007-X56 -- 86324
`B49`	Paus Obs. in Spain, 1 in MPEC 2007-X56 -- 2007 VQ4
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2007-X56 -- 5131
`B04`	Saint-Barthelemy Obs. in Italy, 1 in MPEC 2007-X56 -- 2003 BH84
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2007-X57 -- 2007 XJ20
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-X56 -- 2007 XH16, 2006 US216
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2007-X56 -- 2007 TD71, 2007 MK13, 1998 QR15
`6739`	Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2007-X57 -- 2007 XJ20

Impact Risk Monitoring on 14 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 XF18	NEODyS	1345	2020-2090	50	9.85e-08	-4.15	-4.65	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2007/12/12.206 to 2007/12/13.413."

2007 XK11	NEODyS	1345	2029-2082	5	4.16e-08	-4.73	-4.86	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/13.179."
2007 XK11	JPL Sentry	1344	2029-2101	6	3.7e-07	-3.94	-4.28	0	JPL: "Analysis based on 33 observations spanning 7.0894 days (2007-Dec-06.0886 to 2007-Dec-13.17795)." Diameter approximately 0.492 km. from mean, weighted H=19.2.

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 14 December '07

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

1811	Grabbed MPEC 2007-X58 - 2006 NM - see above
1412	Grabbed MPEC 2007-X57 - 2007 XJ20 - see above
1345	Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
1344	Noted that NEODyS has posted 2007 XF18 as an impact risk - see above Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above Grabbed MPEC 2007-X56 - Daily Orbit Update - see above

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