2007-12-15 Tracking News

Contents on 15 December '07

IAU Minor Planet Center
- NEOCP Activity -- six listings: 3 new, 3 updated
- New MPECs -- four MPECs
- Observers -- fifteen 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 15 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. All of these were "one nighters." So far The Tracking News has counted a total of nine 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 15 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-X59 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2007-X60 time-stamped "16:09 UT" - 2007 XA23 - see below
MPEC 2007-X61 time-stamped "16:17 UT" - 2007 XB23 - see below
MPEC 2007-X62 time-stamped "23:29 UT" - 2007 JF43

MPEC 2007-X62 - "23:29 UT" - 2007 JF43

K07J43F 2007 JF43 (KBO, q=32.328 AU, Q=46.827 AU, H=5.2 ~309 km) from NEAT's Mt. Palomar telescope (2002 April 13.34-36p2, 2002 April 14.49p1 & 2002 May 19.29p1)

MPEC 2007-X61 - "16:17 UT" - 2007 XB23

K07X23B 2007 XB23 (small asteroid, Earth MOID=0.2 LD, H=27.1 ~13m) was discovered at 1329 UT on 14 Dec. by the Siding Spring Survey (SSS), which observed it at Dec. 14.56-59p8 and 15.48p2. This object will be coming within ten lunar distances (LD) of Earth, reaching 3.0 LD on 16 Dec.

MPEC 2007-X60 - "16:09 UT" - 2007 XA23

K07X23A 2007 XA23 (small asteroid, H=23.2 ~78m) was discovered at 0612 UT on 14 Dec. by LINEAR, which observed it at Dec. 14.26-31p5. The discovery was confirmed by Grasslands Obs. (Dec. 15.12-13p3) and Jim Young via Table Mtn. Obs. (Dec. 15.31-33p4).

<< DOU on 15 Dec. '07 >> MPEC 2007-X59 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X18F 2007 XF18 (i=59.0°, arc=2 days, H=20.4 ~282m) from Suno Obs. (Dec. 13.87-88p4)
K07X11K 2007 XK11 (Q=4.518 AU, arc=9 days, H=19.2 ~490m) from the Spacewatch 1.8m telescope (Dec. 15.15p3)
Observations of small asteroids (H>22.0)
K07VD8D 2007 VD138 (Q=4.599 AU, arc=35 days, H=24.5 ~43m) from Astronomical Research Obs. (ARO) (Dec. 14.43-47p3 at V=22.3-6)
Observations of other objects
K07X20J 2007 XJ20 (arc=1 day, H=18.8 ~589m) from ARO (Dec. 14.35p3)
K07X09Y 2007 XY9 (arc=10 days, H=21.1 ~204m) from Spacewatch 1.8m (Dec. 14.27-28p3)
K07X03T 2007 XT3 (arc=9 days, H=21.4 ~178m) from LINEAR (Dec. 14.19-24p5)
K07V04Q 2007 VQ4 (arc=41 days, H=15.9 ~2.24 km, q=1.271 AU) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 14.45-46p5)
K07U01X 2007 UX1 (arc=58 days, H=20.5 ~269m) from LINEAR (Dec. 14.25-31p5)
K07S06P 2007 SP6 (arc=84 days, H=18.2 ~776m) from PJMSO (Dec. 14.41-42p6) and Purple Mtn. Obs. XuYi Station (Dec. 14.58-64p4)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from AAAA Buenos Aires Obs. (Nov. 15.07-10p3)
K07O03G 2007 OG3 (arc=148 days, H=18.4 ~708m) from LINEAR (Dec. 14.26-30p4)
K05W02R 2005 WR2 (arc=3 opp, H=19.3 ~467m) from the Mt. Lemmon Survey (MLS) (Dec. 14.38-40p4)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from PJMSO (Dec. 14.44-45p5)
K05L39W 2005 LW39 (arc=2 opp, H=20.0 ~339m) from Spacewatch 1.8m (Dec. 14.11p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from La Fecha Obs. (Dec. 14.85p1, 14.95p1 & 14.99p1)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.0 ~537m) from LINEAR (Dec. 14.32-37p5)
J94A01W 1994 AW1 (arc=3 opp, H=17.4 ~1.12 km) from LINEAR (Dec. 14.45-50p5) and the Catalina Sky Survey (CSS) (Dec. 14.48-50p4)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from PJMSO (Dec. 14.38p5)
H0891 170891 2004 TY16 from PJMSO (Dec. 14.40p4)
G2004 162004 1991 VE from CSS (Dec. 14.19-21p4)
F3591 153591 2001 SN263 from La Fecha Obs. (Dec. 14.87p1, 14.96p1 & 15.01p1)
F3201 153201 2000 WO107 from LINEAR (Dec. 14.25-30p5) and PJMSO (Dec. 14.37p5)
D8947 138947 2001 BA40 from LINEAR (Dec. 14.32-36p4) and PJMSO (Dec. 14.42-43p5)
96189 96189 1991 NT3 from CSS (Dec. 14.41-42p4)
90403 90403 2003 YE45 from PJMSO (Dec. 14.43-44p5) and Purple Mtn. Obs. XuYi Station (Dec. 14.57-63p4)
85804 85804 1998 WQ5 from PJMSO (Dec. 14.02p5) and La Fecha Obs. (Dec. 14.93p1, 14.98p1 & 15.08p1)
68359 68359 2001 OZ13 from PJMSO (Dec. 14.39p5)
66407 66407 1999 LQ28 from LINEAR (Dec. 14.44-49p5)
66272 66272 1999 JW6 from CSS (Dec. 14.19-21p4)
25916 25916 2001 CP44 from LINEAR (Dec. 14.32-36p4)
19764 19764 2000 NF5 from LINEAR (Dec. 14.21-25p4)
18736 18736 1998 NU from the Spacewatch 0.9m telescope (Dec. 14.07-10p3)
09172 9172 Abhramu (1989 OB) from LINEAR (Dec. 14.33-38p5)
05131 5131 1990 BG from LINEAR (Dec. 14.26-31p5)
04503 4503 Cleobulus (1989 WM) from LINEAR (Dec. 14.46-50p4)

Observers on 15 December '07

Fifteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2007-X59 -- 2007 PU11
`H55`	Astronomical Research Obs. (ARO) in Illinois, 2 in MPEC 2007-X59 -- 2007 XJ20, 2007 VD138
`703`	Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2007-X59 -- 1994 AW1, 96189, 66272, 162004
`651`	Grasslands Obs. in Arizona, 1 in MPEC 2007-X60 -- 2007 XA23
`704`	LINEAR in New Mexico, 14 in MPECs 2007-X59 & 2007-X60 -- 2007 XT3, 2007 XA23, 2007 UX1, 2007 OG3, 2002 XY4, 1994 AW1, 66407, 25916, 19764, 153201, 138947, 9172, 5131, 4503
`J34`	La Fecha Obs., 3 in MPEC 2007-X59 -- 2003 BH84, 85804, 153591
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2007-X59 -- 2005 WR2
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2007-X62 -- 2007 JF43
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2007-X59 -- 2007 VQ4, 2007 SP6, 2005 TU45, 1993 TQ2, 90403, 85804, 68359, 170891, 153201, 138947
`D29`	Purple Mtn. Obs. XuYi Station in China, 2 in MPEC 2007-X59 -- 2007 SP6, 90403
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-X61 -- 2007 XB23
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-X59 -- 18736
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2007-X59 -- 2007 XY9, 2007 XK11, 2005 LW39
`147`	Suno Obs. in Italy, 1 in MPEC 2007-X59 -- 2007 XF18
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-X60 -- 2007 XA23

Impact Risk Monitoring on 15 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	JPL Sentry	1400	2015-2089	3	1.1e-09	-5.56	-5.58	0	JPL: "Analysis based on 20 observations spanning 1.6736 days (2007-Dec-12.20514 to 2007-Dec-13.87874)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
2007 XF18	NEODyS	1400	R E M O V E D

2007 XK11	NEODyS	1401	2029-2073	3	4.77e-08	-4.75	-4.76	0	NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/15.154."
2007 XK11	JPL Sentry	1400	2064-2101	2	7.1e-08	-4.50	-4.57	0	JPL: "Analysis based on 36 observations spanning 9.0648 days (2007-Dec-06.0886 to 2007-Dec-15.15344)." Diameter approximately 0.498 km. from mean, weighted H=19.1.

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 15 December '07

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

2354	Grabbed MPEC 2007-X62 - 2007 JF43 - see above
1703	Grabbed MPEC 2007-X60 - 2007 XA23 - see above Grabbed MPEC 2007-X61 - 2007 XB23 - see above
1401	Noted that NEODyS has updated its 2007 XK11 risk assessment - see above Grabbed MPEC 2007-X59 - Daily Orbit Update - see above
1400	Noted that JPL Sentry has updated its 2007 XF18 risk assessment - see above Noted that NEODyS has removed 2007 XF18 as an impact risk - see above Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above

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