2008-01-11 Tracking News

Contents on 11 January '08

IAU Minor Planet Center
- NEOCP Activity -- 18 listings: 8 new, 10 updated
- New MPECs -- ten MPECs
- Observers -- 26 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 11 January '08

The MPC's NEO Confirmation Page has 18 listings: 8 new, 10 updated

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had eight new and ten updated listings. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 29 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 11 January '08

Minor Planet Electronic Circulars

As of last check at 2356 UTC, there have been ten MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-A42 time-stamped "00:26 UT" - 2007 RT15 - see below
MPEC 2008-A43 time-stamped "07:08 UT" - Daily Orbit Update - see below
MPEC 2008-A44 time-stamped "16:23 UT" - 2008 AE4 - see below
MPEC 2008-A45 time-stamped "16:29 UT" - 2008 AF4 - see below
MPEC 2008-A46 time-stamped "16:40 UT" - 2008 AG4 - see below
MPEC 2008-A47 time-stamped "16:49 UT" - 2008 AH4 - see below
MPEC 2008-A48 time-stamped "16:57 UT" - Comet C/2008 A1 (McNaught) - see below
MPEC 2008-A49 time-stamped "18:24 UT" - Comet C/2007 T1 (McNaught) - see below
MPEC 2008-A50 time-stamped "21:20 UT" - Comets C/2007 T10, 2007 T11, 2007 T12, 2007 T13, 2007 T14 (SOHO) - see below
MPEC 2008-A51 time-stamped "21:26 UT" - Comets C/2007 U3, 2007 U4, 2007 U5, 2007 U6 (SOHO)

MPEC 2008-A51 - "21:26 UT" - Comets C/2007 U3, 2007 U4, 2007 U5, 2007 U6 (SOHO)

CK07U060 C/2007 U6 from the LASCO Coronagraph 2 on the Solar & Heliospheric Obs. (SOHO) (2007 Oct. 24.73-79p10)
CK07U050 C/2007 U5 from the LASCO Coronagraph 3 on the Solar & Heliospheric Obs. (SOHO) (2007 Oct. 24.49-61p14) and SOHO C2 (2007 Oct. 24.62-75p20)
CK07U040 C/2007 U4 from SOHO C2 (2007 Oct. 24.15-25p18)
CK07U030 C/2007 U3 from SOHO C3 (2007 Oct. 24.11-28p18 & 2007 Oct. 24.32-64p32) and SOHO C2 (2007 Oct. 24.62-79p26)

MPEC 2008-A50 - "21:20 UT" - Comets C/2007 T10, 2007 T11, 2007 T12, 2007 T13, 2007 T14 (SOHO)

CK07T140 C/2007 T14 from SOHO C3 (2007 Oct. 15.47-51p6) and SOHO C2 (2007 Oct. 15.54-63p16)
CK07T130 C/2007 T13 from SOHO C2 (2007 Oct. 15.33-42p16)
CK07T120 C/2007 T12 from SOHO C2 (2007 Oct. 13.58-69p16)
CK07T110 C/2007 T11 from SOHO C2 (2007 Oct. 13.46-52p12)
CK07T100 C/2007 T10 from SOHO C3 (2007 Oct. 11.07-24p18) and SOHO C2 (2007 Oct. 11.31-40p14)

MPEC 2008-A49 - "18:24 UT" - Comet C/2007 T1 (McNaught)

CK07T010 C/2007 T1 (McNaught) (i=117.6°, q=0.968 AU, Q=6444.765 AU, TP=2007 Dec. 12.53059 TT) from North Ryde Obs. (Jan. 10.72p2 & 11.71-73p2)

MPEC 2008-A48 - "16:57 UT" - Comet C/2008 A1 (McNaught)

CK08A010 C/2008 A1 (i=88.6°, q=1.511 AU, TP=2008 Nov. 3.860 TT) from the Siding Spring Survey (SSS) (Jan. 10.57-60p4, 10.66p2, 10.76p1 & 11.44p2), Table Mtn. Obs. (Jan. 11.28-31p4), RAS Obs. Mayhill (Jan. 11.28-30p2), North Ryde Obs. (Jan. 11.43-44p2), and Lulin Minor Bodies Tracking (LIMIT) (Jan. 11.64p3)

MPEC 2008-A47 - "16:49 UT" - 2008 AH4

K08A04H 2008 AH4 (i=66.3°, H=21.5 ~170m) was discovered at 1122 UT on 10 Jan. by the Mt. Lemmon Survey (MLS), which observed it at Jan. 10.47-55p14. The discovery was confirmed by Farpoint Obs. (Jan. 11.49-50p4).

MPEC 2008-A46 - "16:40 UT" - 2008 AG4

K08A04G 2008 AG4 (small asteroid, H=24.6 ~41m) was discovered at 1004 UT on 10 Jan. by the MLS, which observed it at Jan. 10.42-49p8 and 11.41-44p4. The discovery was confirmed by Farpoint Obs. (Jan. 11.43-44p3) and the Spacewatch 1.8m telescope (Jan. 11.51-52p3).

MPEC 2008-A45 - "16:29 UT" - 2008 AF4

K08A04F 2008 AF4 (Earth MOID=1.0 LD, H=19.6 ~407m) was discovered at 0930 UT on 10 Jan. by LINEAR, which observed it at Jan. 10.40-44p4. The discovery was confirmed by the SZTE Asteroid Program (SZTE) (Jan. 11.05-07p27), the Catalina Sky Survey (CSS) (Jan. 11.43-46p4), MLS (Jan. 11.48-51p4), and Farpoint Obs. (Jan. 11.50-51p4).

MPEC 2008-A44 - "16:23 UT" - 2008 AE4

K08A04E 2008 AE4 (risk-listed, H=24.0 ~54m) was discovered at 0456 UT on 10 Jan. by LINEAR, which observed it at Jan. 10.21-26p5. The discovery was confirmed by Farpoint Obs. (Jan. 11.26-27p2) and Spacewatch 1.8m (Jan. 11.32p3).

<< DOU on 11 Jan. '08 >> MPEC 2008-A43 - "07:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y56Q 2007 YQ56 (arc=10 days, H=19.8 ~371m) from Spacewatch 1.8m (Jan. 10.16-17p3)
K07U00S 2007 US (small asteroid, arc=3 days, H=22.7 ~98m) from Spacewatch 1.8m (2007 Oct. 19.11-14p3)
Observations of recently (no longer) risk-listed objects
K07Y56V 2007 YV56 (arc=11 days, H=21.0 ~214m) from LINEAR (Jan. 10.33-38p5) and SZTE (Jan. 11.08-09p3)
K07Y56M 2007 YM56 (small asteroid, arc=11 days, H=22.1 ~129m) from Spacewatch 1.8m (Jan. 10.26-27p3)
K07Y00Z 2007 YZ (arc=23 days, H=19.7 ~389m) from Hadano Obs. (Jan. 1.63-64p5 & 2.66p5)
Observations of small asteroids (H>22.0)
K08A03F 2008 AF3 (arc=1 day, H=26.0 ~21m) from Engelhardt Obs. Zelenchukskaya Station (Jan. 10.76-77p5)
Observations of almost-small asteroids (21.7<H<=22.0)
K07Y56U 2007 YU56 (arc=10 days, H=22.0 ~135m) from Spacewatch 1.8m (Jan. 10.41-44p3)
Observations of other objects
K08A00D 2008 AD (arc=10 days, H=20.1 ~323m) from Jornada Obs. (Jan. 11.11-13p4)
K07Y56O 2007 YO56 (arc=11 days, H=20.2 ~309m) from Spacewatch 1.8m (Jan. 10.30-33p3)
K07Y01F 2007 YF1 (Q=4.001 AU, arc=25 days, H=18.7 ~616m) from CSS (Jan. 10.40-42p4)
K07Y00K 2007 YK (arc=25 days, H=17.5 ~1.07 km) from CSS (Jan. 10.49-51p3)
K07X09Y 2007 XY9 (arc=37 days, H=21.0 ~214m) from Spacewatch 1.8m (Jan. 10.24-26p2)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.8 ~2.34 km, q=1.271 AU) from Hadano Obs. (Jan. 2.77-79p5)
K06C00G 2006 CG (arc=3 opp, H=19.1 ~513m) from Spacewatch 1.8m (Jan. 10.14p2)
K05X08K 2005 XK8 (arc=2 opp, H=19.8 ~371m) from MLS (Jan. 10.17-18p3)
K05X01D 2005 XD1 (arc=2 opp, H=19.3 ~467m) from LINEAR (Jan. 10.20-25p5)
K05W56J 2005 WJ56 (arc=3 opp, H=18.1 ~812m) from Hadano Obs. (Jan. 1.72p6 & 9.54p6), Montana Blanca Obs. (Jan. 9.85-86p3 & 10.81-87p4), Andrew Lowe via RAS Obs. Mayhill (Jan. 10.23-24p4), Eschenberg Obs. (Jan. 10.77p7), Nazaret Obs. (Jan. 10.85-87p4 & 10.94p2), Montcabre Obs. (Jan. 10.88-91p3), Atlante Obs. (Jan. 10.89-92p4), and Petit Jean Mtn. South Obs. (PJMSO) (Jan. 11.19-20p24)
K03Y94Q 2003 YQ94 (Q=4.292 AU, arc=2 opp, H=17.7 ~977m) from CSS (Jan. 10.12-15p4)
K03E16E 2003 EE16 (arc=4 opp, H=19.9 ~355m) from Spacewatch 1.8m (Jan. 10.54p3)
K01T01W 2001 TW1 (arc=4 opp, H=19.1 ~513m) from Spacewatch 1.8m (Jan. 10.12p2)
K01M08A 2001 MA8 (arc=4 opp, H=17.6 ~1.02 km) from Spacewatch 1.8m (Jan. 10.45-47p3 at V=22.2-5)
J99R28Q 1999 RQ28 (arc=2 opp, H=20.7 ~245m) from the Spacewatch 0.9m telescope (Jan. 10.38-41p3)
J98FD4X 1998 FX134 (arc=3 opp, H=18.6 ~645m) from Spacewatch 1.8m (Jan. 10.34-37p3)
H2722 172722 2004 BV102 from LINEAR (Jan. 10.39-44p5) and Naef Obs. (Jan. 10.99-03p3)
H0502 170502 2003 WM7 from LINEAR (Jan. 10.07-12p5) and CSS (Jan. 10.10-12p4)
G2038 162038 1996 DH from CSS (Jan. 10.46-48p4)
D7052 137052 1998 VO33 from Naef Obs. (Jan. 10.86-88p2)
D6793 136793 1997 AQ18 from Naef Obs. (Jan. 10.85-89p3)
22099 22099 2000 EX106 from CSS (Jan. 10.49-51p3) and MLS (Jan. 10.52-53p4)
08034 8034 Akka (1992 LR) from MLS (Jan. 10.13-15p4)
04954 4954 Eric (1990 SQ) from Bradbury Obs. (Jan. 10.93p1)
04450 4450 Pan (1987 SY) from MLS (Jan. 10.42-44p4)
03288 3288 Seleucus (1982 DV) from CSS (Jan. 10.31-36p4)
01864 1864 Daedalus (1971 FA) from LINEAR (Jan. 10.43-45p3)
01862 1862 Apollo (1932 HA) from Inastars Obs. (Jan. 11.00-01p2)
01036 1036 Ganymed (1924 TD) from LINEAR (Jan. 10.28-34p5)

MPEC 2008-A42 - "00:26 UT" - 2007 RT15

K07R15T 2007 RT15 (KBO, q=30.081 AU, Q=50.162 AU, H=7.0 ~135 km) from Mt. Palomar (2007 Oct. 18.32p1, 2007 Oct. 18.37p1, 2007 Oct. 18.42p1, Dec. 4.14p1 & 14.11p1)

Observers on 11 January '08

A total of 26 observing facilities appear in today's MPECs.

Code	Observer / observatory
`J51`	Atlante Obs. in the Canary Islands, 1 in MPEC 2008-A43 -- 2005 WJ56
`937`	Bradbury Obs., 1 in MPEC 2008-A43 -- 4954
`703`	Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2008-A43 & 2008-A45 -- 2008 AF4, 2007 YK, 2007 YF1, 2003 YQ94, 22099, 170502, 162038, 3288
`114`	Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-A43 -- 2008 AF3
`151`	Eschenberg Obs. in Switzerland, 1 in MPEC 2008-A43 -- 2005 WJ56
`734`	Farpoint Obs. in Kansas, 4 in MPECs 2008-A44, 2008-A45, 2008-A46 & 2008-A47 -- 2008 AH4, 2008 AG4, 2008 AF4, 2008 AE4
`355`	Hadano Obs. in Japan, 3 in MPEC 2008-A43 -- 2007 YZ, 2007 VQ4, 2005 WJ56
`B15`	Inastars Obs. in Germany, 1 in MPEC 2008-A43 -- 1862
`715`	Jornada Obs. in New Mexico, 1 in MPEC 2008-A43 -- 2008 AD
`704`	LINEAR in New Mexico, 8 in MPECs 2008-A43, 2008-A44 & 2008-A45 -- 2008 AF4, 2008 AE4, 2007 YV56, 2005 XD1, 172722, 170502, 1864, 1036
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-A48 -- C/2008 A1
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-A43 -- 2005 WJ56
`213`	Montcabre Obs. in Spain, 1 in MPEC 2008-A43 -- 2005 WJ56
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2008-A43, 2008-A45, 2008-A46 & 2008-A47 -- 2008 AH4, 2008 AG4, 2008 AF4, 2005 XK8, 22099, 8034, 4450
`675`	Mt. Palomar in southern California, 1 in MPEC 2008-A42 -- 2007 RT15
`A13`	Naef Obs. in Switzerland, 3 in MPEC 2008-A43 -- 172722, 137052, 136793
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2008-A43 -- 2005 WJ56
`423`	North Ryde Obs. in New South Wales, 2 in MPECs 2008-A48 & 2008-A49 -- C/2008 A1, C/2007 T1
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-A43 -- 2005 WJ56
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-A48 -- C/2008 A1
`H066`	Andrew Lowe in Alberta via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-A43 -- 2005 WJ56
`461`	SZTE Asteroid Program (SZTE) in Hungary, 2 in MPECs 2008-A43 & 2008-A45 -- 2008 AF4, 2007 YV56
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2008-A48 -- C/2008 A1
`2492`	LASCO Coronagraph 2 (SOHO C2) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 9 in MPECs 2008-A50 & 2008-A51 -- C/2007 U6, C/2007 U5, C/2007 U4, C/2007 U3, C/2007 T14, C/2007 T13, C/2007 T12, C/2007 T11, C/2007 T10
`2493`	LASCO Coronagraph 3 (SOHO C3) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 4 in MPECs 2008-A50 & 2008-A51 -- C/2007 U5, C/2007 U3, C/2007 T14, C/2007 T10
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-A43 -- 1999 RQ28
`291`	Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2008-A43, 2008-A44 & 2008-A46 -- 2008 AG4, 2008 AE4, 2007 YU56, 2007 YQ56, 2007 YO56, 2007 YM56, 2007 XY9, 2007 US, 2006 CG, 2003 EE16, 2001 TW1, 2001 MA8, 1998 FX134
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2008-A48 -- C/2008 A1

Impact Risk Monitoring on 11 January '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2356 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 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

2008 AE4	JPL Sentry	1956	2074	1	3.6e-09	-7.88	-7.88	0	JPL: "Analysis based on 10 observations spanning 1.1184 days (2008-Jan-10.20616 to 2008-Jan-11.32459)." Diameter approximately 0.062 km. from mean, weighted H=23.7.

2007 YQ56	JPL Sentry	1533	2027-2106	11	7.8e-08	-4.78	-5.29	0	JPL: "Analysis based on 54 observations spanning 10.022 days (2007-Dec-31.14551 to 2008-Jan-10.16705)." Diameter approximately 0.350 km. from mean, weighted H=20.0.
2007 YQ56	NEODyS	1533	2052-2089	16	4.42e-08	-4.96	-5.38	0	NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2007/12/31.146 to 2008/01/10.168."

2007 VK184	JPL Sentry	2356	2048-2057	4	3.4e-04	-1.82	-1.83	1	JPL: "Analysis based on 101 observations spanning 60.013 days (2007-Nov-12.13904 to 2008-Jan-11.15189)." Diameter approximately 0.130 km. from mean, weighted H=22.0.

2007 US	NEODyS	1601	R E M O V E D
2007 US	JPL Sentry	1533	R E M O V E D						JPL: Risk listing removed at 1152 UTC.

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 11 January '08

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

2356	Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
2204	Grabbed MPEC 2008-A50 - Comets C/2007 T10, 2007 T11, 2007 T12, 2007 T13, 2007 T14 (SOHO) - see above Grabbed MPEC 2008-A51 - Comets C/2007 U3, 2007 U4, 2007 U5, 2007 U6 (SOHO) - see above
1956	Noted that JPL Sentry has posted 2008 AE4 as an impact risk - see above
1857	Grabbed MPEC 2008-A49 - Comet C/2007 T1 (McNaught) - see above
1809	Grabbed MPEC 2008-A48 - Comet C/2008 A1 (McNaught) - see above
1706	Grabbed MPEC 2008-A46 - 2008 AG4 - see above Grabbed MPEC 2008-A47 - 2008 AH4 - see above
1641	Grabbed MPEC 2008-A44 - 2008 AE4 - see above Grabbed MPEC 2008-A45 - 2008 AF4 - see above
1601	Noted that NEODyS has removed 2007 US as an impact risk - see above
1533	Noted that JPL Sentry has removed 2007 US as an impact risk - see above Noted that JPL Sentry has updated its 2007 YQ56 risk assessment - see above Noted that NEODyS has updated its 2007 YQ56 risk assessment - see above Grabbed MPEC 2008-A43 - Daily Orbit Update - see above
0106	Grabbed MPEC 2008-A42 - 2007 RT15 - see above

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