Contents  on 30 April '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 30 April '09

The MPC's NEO Confirmation Page has 12 listings: 4 new, 8 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and eight updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of fourteen 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 30 April '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-H83 - "14:09 UT" - 2009 HV77


MPEC 2009-H82 - "14:06 UT" - 2009 HU77


<< DOU on 30 Apr. '09 >>  MPEC 2009-H81 - "06:10 UT" - Daily Orbit Update

Observers  on 30 April '09

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
B88Bigmuskie Obs. in Italy, 1 in MPEC 2009-H81 -- 177614
300Bisei Spaceguard Center in Japan, 1 in MPEC 2009-H81 -- 2009 HK73
432Boambee Obs. in New South Wales, 2 in MPEC 2009-H81 -- 108519, 3199
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-H81 & 2009-H82 -- 2009 HU77, 2009 HB, 35396, 8035, 5604
I21El Condor Obs. in Argentina, 4 in MPEC 2009-H81 -- 2009 HV44, 2009 DL1, 136617, 1036
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2009-H81 -- 2009 HV44, 2009 DE47, 2008 WL60, 2008 SV11, 2007 BT2
J75La Sagra Obs. in Spain, 1 in MPEC 2009-H83 -- 2009 HV77
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2009-H81, 2009-H82 & 2009-H83 -- 2009 HV77, 2009 HU77, 2009 HM73, 2009 FF19, 2008 SW150, 2002 HF8, 39557
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-H81 & 2009-H82 -- 2009 HU77, 2009 HK73
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-H81 -- 2009 HY51, 2009 HL21, 2005 SA71, 136874
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2009-H81 -- 2009 HY51, 2009 HX51, 2009 HW67, 2009 HV58, 2009 HM73, 2009 HC, 2009 FH44, 2008 YS27
G56Walnut Creek Obs. in northern California, 2 in MPEC 2009-H81 -- 2009 HG60, 2008 WL60
D20Zadko Obs. in Western Australia, 1 in MPEC 2009-H81 -- 2002 LT38
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 April '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 HM73JPL Sentry1327206613.2e-10-8.52-8.520JPL: "Analysis based on 20 observations spanning 1.8418 days (2009-Apr-28.37383 to 2009-Apr-30.21564)." Diameter approximately 0.096 km. from mean, weighted H=22.7.
NEODyS1327208614.3e-11-9.68-9.680NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/04/28.375 to 2009/04/30.216."
2009 HW67JPL Sentry13272046-207941.3e-06-6.17-6.510JPL: "Analysis based on 26 observations spanning 2.9325 days (2009-Apr-27.29601 to 2009-Apr-30.22847)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
NEODyS13272046-207961.51e-06-6.08-6.430NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2009/04/27.297 to 2009/04/30.229."
2009 HV58JPL Sentry13272011-2108455.5e-08-3.33-3.490JPL: "Analysis based on 23 observations spanning 3.9831 days (2009-Apr-25.39439 to 2009-Apr-29.37752)." Diameter approximately 0.451 km. from mean, weighted H=19.4.
NEODyS13272011-2090413.74e-08-3.39-3.490NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/29.378."
2009 HCJPL Sentry13272097-209951.0e-06-6.40-6.930JPL: "Analysis based on 99 observations spanning 12.045 days (2009-Apr-17.23164 to 2009-Apr-29.2771)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 30 April '09

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

1433Grabbed MPEC 2009-H82 - 2009 HU77 - see above
Grabbed MPEC 2009-H83 - 2009 HV77 - see above
1327Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has updated its 2009 HM73 risk assessment - see above
Noted that NEODyS has posted 2009 HM73 as an impact risk - see above
Noted that JPL Sentry has posted 2009 HV58 as an impact risk - see above
Noted that NEODyS has updated its 2009 HV58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 HW67 risk assessment - see above
Noted that NEODyS has updated its 2009 HW67 risk assessment - see above
Grabbed MPEC 2009-H81 - Daily Orbit Update - see above