Contents  on 18 December '09

Resources:

The latest A/CC news is available via framed access, RSS news feed 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 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 18 December '09

The MPC's NEO Confirmation Page has 8 listings: 4 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and four updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of eleven listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 18 December '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-Y24 - "18:26 UT" - 2009 YG


MPEC 2009-Y23 - "17:46 UT" - 2009 YF


<< DOU on 18 Dec. '09 >>  MPEC 2009-Y22 - "07:10 UT" - Daily Orbit Update

Observers  on 18 December '09

A total of 23 observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 4 in MPEC 2009-Y22 -- 2005 MC, 35396, 5646, 4015
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 21 in MPEC 2009-Y22 -- 2009 XZ6, 2009 XR2, 2009 XP2, 2009 XD, 2009 WZ104, 2009 WW104, 2009 WR25, 2009 WN6, 2009 WF104, 2009 WC26, 2009 VA26, 2009 UV18, 2009 UQ5, 2009 UM, 2009 TL4, 2009 SO103, 2007 VD3, 2007 AG12, 2006 WW, 2001 SG286, 2001 GQ2
235CAST Obs. in Italy, 2 in MPECs 2009-Y22 & 2009-Y23 -- 2009 YF, 4015
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2009-Y22 -- 2005 MC, 2002 XC91, 1993 RA, 225900
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-Y22 -- 2009 XZ6
143Gnosca Obs. in Switzerland, 1 in MPEC 2009-Y23 -- 2009 YF
J95Great Shefford Obs. in England, 2 in MPECs 2009-Y22 & 2009-Y23 -- 2009 YF, 2009 XZ6
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-Y24 -- 2009 YG
704LINEAR in New Mexico, 14 in MPECs 2009-Y22, 2009-Y23 & 2009-Y24 -- 2009 YG, 2009 YF, 2009 XT6, 2009 XP7, 2009 XF2, 2009 WR6, 2009 WE253, 2009 RN, 2009 QD34, 2006 UR, 2005 QL, 99248, 163899, 152560
J38La Vara Obs. in Spain, 1 in MPEC 2009-Y22 -- 4015
130Lumezzane Obs. in Italy, 4 in MPEC 2009-Y22 -- 2005 TY51, 2002 NP1, 2001 BP61, 177614
H01Magdalena Ridge Obs. (MRO) in New Mexico, 9 in MPECs 2009-Y22, 2009-Y23 & 2009-Y24 -- 2009 YG, 2009 YF, 2009 XT6, 2009 XO2, 2009 XO, 2009 XG8, 2009 XC2, 2002 XC91, 1999 VF22
568+Andrea Boattini on Mauna Kea in Hawaii, 1 in MPEC 2009-Y22 -- 2009 WE253
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-Y22 -- 97725
932McCarthy Obs. in Connecticut, 1 in MPEC 2009-Y23 -- 2009 YF
900Moriyama Obs. in Japan, 3 in MPECs 2009-Y22, 2009-Y23 & 2009-Y24 -- 2009 YG, 2009 YF, 2002 XC91
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2009-Y22 -- 2009 XG8, 2009 WZ104, 2006 WN1, 2002 NX, 23714, 16816
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2009-Y22 -- 2009 XO2, 2002 XC91
473Remanzacco Obs. in Italy, 1 in MPEC 2009-Y23 -- 2009 YF
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-Y22 -- 2002 XC91
204Schiaparelli Obs. in Italy, 3 in MPECs 2009-Y22 & 2009-Y23 -- 2009 YF, 2009 QD34, 1998 VF32
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2009-Y22 -- 2009 XO2, 2009 WN25, 2009 UN3
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2009-Y22 -- 2003 XF11, 68359, 199145
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2009-Y23 & 2009-Y24 -- 2009 YG, 2009 YF
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 December '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 YGJPL Sentry20302025-2108593.1e-07-2.94-3.490JPL: "Analysis based on 18 observations spanning 1.3148 days (2009-Dec-17.42051 to 2009-Dec-18.7353)." Diameter approximately 0.831 km. from mean, weighted H=18.0.
2009 XG8NEODyS1449R E M O V E D-
JPL Sentry1449R E M O V E DJPL: Risk listing removed at 0950 UTC.
2009 XT6JPL Sentry14492037-207128.7e-07-3.42-3.480JPL: "Analysis based on 53 observations spanning 4.0204 days (2009-Dec-13.4056 to 2009-Dec-17.42598)." Diameter approximately 0.330 km. from mean, weighted H=20.0.
NEODyS14492037-207128.74e-07-3.40-3.480NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2009/12/13.406 to 2009/12/17.427."
2009 XONEODyS1449208311.4e-08-5.66-5.660NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/18.261."

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 18 December '09

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

2030Noted that JPL Sentry has posted 2009 YG as an impact risk - see above
1900Grabbed MPEC 2009-Y23 - 2009 YF - see above
Grabbed MPEC 2009-Y24 - 2009 YG - see above
1449Noted that JPL Sentry has removed 2009 XG8 as an impact risk - see above
Noted that NEODyS has removed 2009 XG8 as an impact risk - see above
Noted that NEODyS has updated its 2009 XO risk assessment - see above
Noted that JPL Sentry has updated its 2009 XT6 risk assessment - see above
Noted that NEODyS has updated its 2009 XT6 risk assessment - see above
Grabbed MPEC 2009-Y22 - Daily Orbit Update - see above