2008-01-05 Tracking News

Contents on 5 January '08

IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 new
- New MPECs -- two MPECs
- Observers -- twelve observing facilities
Impact Risk Monitoring -- six 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 5 January '08

The MPC's NEO Confirmation Page has 1 listing: 1 new

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. This was a "one nighter." So far The Tracking News has counted a total of two 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 5 January '08

Minor Planet Electronic Circulars

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

MPEC 2008-A24 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2008-A25 time-stamped "15:20 UT" - 2007 YZ58

MPEC 2008-A25 - "15:20 UT" - 2007 YZ58

K07Y58Z 2007 YZ58 (H=19.8 ~371m) was discovered at 0631 UT on 31 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 31.27-34p7. The discovery was confirmed by Astronomical Research Obs. (ARO) (Jan. 3.29-30p3) and Great Shefford Obs. (Jan. 5.03-05p2).

<< DOU on 5 Jan. '08 >> MPEC 2008-A24 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y56V 2007 YV56 (arc=4 days, H=21.1 ~204m) from Comeglians Obs. (Jan. 1.01-02p2), ARO (Jan. 3.41-42p7), McDonald Obs. (Jan. 4.42-43p3), and Petit Jean Mtn. South Obs. (PJMSO) (Jan. 4.42-44p8)
K07Y56S 2007 YS56 (small asteroid, arc=4 days, H=25.7 ~25m) from Mt. John Obs. (Jan. 4.45-46p4)
K07Y56Q 2007 YQ56 (arc=5 days, H=19.7 ~389m) from McDonald Obs. (Jan. 5.10-11p3)
K07Y56M 2007 YM56 (small asteroid, arc=4 days, H=22.1 ~129m) from ARO (Jan. 3.31-32p3)
K07Y02B 2007 YB2 (Q=4.906 AU, arc=17 days, H=18.3 ~741m) from McDonald Obs. (Jan. 4.47-48p3)
K07VI4K 2007 VK184 (almost small, arc=53 days, H=22.0 ~135m) from Magdalena Ridge Obs. (MRO) (Jan. 4.07-11p4 at R=22.5-7)
Observations of recently (no longer) risk-listed objects
K08A00E 2008 AE (arc=3 days, H=19.5 ~426m) from Comeglians Obs. (Jan. 2.10-12p2), McDonald Obs. (Jan. 4.44-45p2), and PJMSO (Jan. 4.44-45p7)
K07Y00Z 2007 YZ (arc=18 days, H=19.7 ~389m) from Hadano Obs. (Dec. 30.57-58p7 & 31.67-68p5) and PJMSO (Jan. 4.34-35p9)
K07X25F 2007 XF25 (arc=19 days, H=21.3 ~186m) from ARO (Jan. 3.27-28p4)
K07X11K 2007 XK11 (Q=4.601 AU, arc=30 days, H=19.2 ~490m) from McDonald Obs. (Jan. 5.12-13p3)
K07X03P 2007 XP3 (q=0.251 AU, Q=4.240 AU, arc=30 days, H=19.0 ~537m) from ARO (Jan. 3.20-21p3)
Observations of small asteroids (H>22.0)
K07Y56T 2007 YT56 (arc=3 days, H=23.4 ~71m) from ARO (Jan. 3.33-34p3)
K07Y56R 2007 YR56 (arc=3 days, H=26.0 ~21m) from ARO (Jan. 3.23p5)
K07X23V 2007 XV23 (Q=4.700 AU, arc=20 days, H=25.1 ~32m) from ARO (Jan. 3.34-36p3 at V=22.2)
K07X23A 2007 XA23 (arc=20 days, H=23.0 ~85m) from ARO (Jan. 3.22-23p4)
K07V03D 2007 VD3 (arc=62 days, H=22.1 ~129m) from ARO (Jan. 3.02-05p3 at V=22.1)
K07U00R 2007 UR (Q=4.534 AU, arc=79 days, H=23.9 ~56m) from ARO (Jan. 3.24-27p3 at V=22.2-3)
Observations of other objects
K08A00D 2008 AD (arc=3 days, H=20.2 ~309m) from ARO (Jan. 3.15p4) and McDonald Obs. (Jan. 4.19p3)
K07Y56O 2007 YO56 (arc=4 days, H=20.2 ~309m) from ARO (Jan. 3.36-37p2)
K07Y01F 2007 YF1 (Q=4.002 AU, arc=19 days, H=18.6 ~645m) from McDonald Obs. (Jan. 4.37-38p3)
K07X20J 2007 XJ20 (arc=23 days, H=18.4 ~708m) from McDonald Obs. (Jan. 5.14-16p3)
K07X03N 2007 XN3 (Q=4.159 AU, arc=31 days, H=20.6 ~257m) from ARO (Jan. 3.10-12p3)
K07W55F 2007 WF55 (arc=34 days, H=19.1 ~513m) from PJMSO (Jan. 4.29-30p5)
K07W05B 2007 WB5 (arc=44 days, H=19.0 ~537m) from ARO (Jan. 3.07-09p3)
K07W04W 2007 WW4 (arc=45 days, H=19.5 ~426m) from ARO (Jan. 3.13-14p3)
K07VD7X 2007 VX137 (arc=56 days, H=18.5 ~676m) from ARO (Jan. 3.17-20p5)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.8 ~2.34 km, q=1.271 AU) from Hadano Obs. (Dec. 30.71-73p7) and PJMSO (Jan. 4.45-46p8)
K07T23C 2007 TC23 (Q=4.525 AU, arc=85 days, H=20.6 ~257m) from ARO (Jan. 3.48-50p3)
K07S06P 2007 SP6 (arc=2 opp, H=18.2 ~776m) from PJMSO (Jan. 4.38-39p6)
K07R20D 2007 RD20 (arc=110 days, H=21.0 ~214m) from ARO (Jan. 3.11-13p3 at V=22.1)
K07N04S 2007 NS4 (arc=172 days, H=19.0 ~537m) from ARO (Jan. 3.48-50p3)
K07N01L 2007 NL1 (arc=2 opp, H=21.6 ~162m) from ARO (Jan. 3.37-39p3)
K07E88L 2007 EL88 (arc=2 opp, H=18.9 ~562m) from Mt. John Obs. (Jan. 4.60-63p3)
K05X08K 2005 XK8 (arc=2 opp, H=19.8 ~371m) from PJMSO (Jan. 4.25p5)
K05X01D 2005 XD1 (arc=2 opp, H=19.3 ~467m) from PJMSO (Jan. 4.28-29p5)
K05W56J 2005 WJ56 (arc=3 opp, H=18.0 ~851m) from Ingenio Obs. (Jan. 3.95p4)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from PJMSO (Jan. 4.37-38p6)
K05EM4C 2005 EC224 (arc=4 opp, H=18.1 ~812m) from ARO (Jan. 3.44-47p3)
K04H33K 2004 HK33 (arc=5 opp, H=17.6 ~1.02 km) from ARO (Jan. 3.38-40p3)
K03N01W 2003 NW1 (arc=2 opp, H=18.7 ~616m) from ARO (Jan. 3.40-43p3 at V=22.9-23.1)
K03C17N 2003 CN17 (arc=2 opp, H=19.2 ~490m) from ARO (Jan. 3.45-47p3)
J98Y04M 1998 YM4 (arc=2 opp, H=19.7 ~389m) from Bisei Spaceguard Center (Bisei) (Dec. 14.78-79p5) and Hadano Obs. (Dec. 30.62-63p4)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from PJMSO (Jan. 4.35-36p5)
H0891 170891 2004 TY16 from PJMSO (Jan. 4.37p5)
F3591 153591 2001 SN263 from PJMSO (Jan. 4.27p5)
D8947 138947 2001 BA40 from PJMSO (Jan. 4.30-31p5)
D7052 137052 1998 VO33 from PJMSO (Jan. 4.36-37p5)
01862 1862 Apollo (1932 HA) from Purple Mtn. Obs. XuYi Station (Jan. 4.78-83p4)

Observers on 5 January '08

Twelve observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 25 in MPECs 2008-A24 & 2008-A25 -- 2008 AD, 2007 YZ58, 2007 YV56, 2007 YT56, 2007 YR56, 2007 YO56, 2007 YM56, 2007 XV23, 2007 XP3, 2007 XN3, 2007 XF25, 2007 XA23, 2007 WW4, 2007 WB5, 2007 VX137, 2007 VD3, 2007 UR, 2007 TC23, 2007 RD20, 2007 NS4, 2007 NL1, 2005 EC224, 2004 HK33, 2003 NW1, 2003 CN17
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2008-A24 -- 1998 YM4
`B55`	Comeglians Obs., 2 in MPEC 2008-A24 -- 2008 AE, 2007 YV56
`J95`	Great Shefford Obs. in England, 1 in MPEC 2008-A25 -- 2007 YZ58
`355`	Hadano Obs. in Japan, 3 in MPEC 2008-A24 -- 2007 YZ, 2007 VQ4, 1998 YM4
`J39`	Ingenio Obs. in the Canary Islands, 1 in MPEC 2008-A24 -- 2005 WJ56
`H01`	Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-A24 -- 2007 VK184
`711`	McDonald Obs. in Texas, 8 in MPEC 2008-A24 -- 2008 AE, 2008 AD, 2007 YV56, 2007 YQ56, 2007 YF1, 2007 YB2, 2007 XK11, 2007 XJ20
`474`	Mt. John Obs. in New Zealand, 2 in MPEC 2008-A24 -- 2007 YS56, 2007 EL88
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-A25 -- 2007 YZ58
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2008-A24 -- 2008 AE, 2007 YZ, 2007 YV56, 2007 WF55, 2007 VQ4, 2007 SP6, 2005 XK8, 2005 XD1, 2005 TU45, 1993 TQ2, 170891, 153591, 138947, 137052
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-A24 -- 1862

Impact Risk Monitoring on 5 January '08

**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 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 YV56	JPL Sentry	1555	2103	1	1.1e-09	-7.09	-7.09	0	JPL: "Analysis based on 59 observations spanning 3.9211 days (2007-Dec-31.5148 to 2008-Jan-04.43595)." Diameter approximately 0.210 km. from mean, weighted H=21.0.

2007 YS56	JPL Sentry	1555	R E M O V E D						JPL: Risk listing removed at 1129 UTC.

2007 YQ56	NEODyS	1556	2027-2089	46	6.88e-07	-3.57	-3.99	0	NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2007/12/31.146 to 2008/01/05.111."
2007 YQ56	JPL Sentry	1555	2027-2107	35	6.3e-07	-3.64	-4.05	0	JPL: "Analysis based on 45 observations spanning 4.9644 days (2007-Dec-31.14551 to 2008-Jan-05.10991)." Diameter approximately 0.360 km. from mean, weighted H=19.9.

2007 YM56	JPL Sentry	1555	R E M O V E D						JPL: Risk listing removed at 1432 UTC.

2007 YB2	JPL Sentry	1555	R E M O V E D						JPL: Risk listing removed at 1241 UTC.
2007 YB2	NEODyS	1555	R E M O V E D

2007 VK184	JPL Sentry	1627	2048-2057	4	3.8e-04	-1.77	-1.78	1	JPL: "Analysis based on 99 observations spanning 52.970 days (2007-Nov-12.13904 to 2008-Jan-04.10934)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
2007 VK184	NEODyS	1556	2048-2061	5	3.81e-04	-1.77	-1.78	1	NEODyS: "Based on 100 optical observations (of which 1 are rejected as outliers) from 2007/11/12.140 to 2008/01/04.110. NOTE: The Virtual Impactor in 2048/06/03.088 in the table above is rated as Torino Scale 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 5 January '08

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

2354	The NEOCP has become active
1627	Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
1556	Noted that NEODyS has updated its 2007 VK184 risk assessment - see above Noted that NEODyS has updated its 2007 YQ56 risk assessment - see above
1555	Noted that JPL Sentry has removed 2007 YB2 as an impact risk - see above Noted that NEODyS has removed 2007 YB2 as an impact risk - see above Noted that JPL Sentry has removed 2007 YM56 as an impact risk - see above Noted that JPL Sentry has updated its 2007 YQ56 risk assessment - see above Noted that JPL Sentry has removed 2007 YS56 as an impact risk - see above Noted that JPL Sentry has updated its 2007 YV56 risk assessment - see above Grabbed MPEC 2008-A24 - Daily Orbit Update - see above Grabbed MPEC 2008-A25 - 2007 YZ58 - see above The NEOCP has become empty

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