Contents  on 13 April '11

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 13 April '11

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

When last checked at 2138 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and four updated listings. All of these were "one nighters." So far The Tracking News has counted a total of fourteen listings on the NEOCP 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 13 April '11

Minor Planet Electronic Circulars

As of last check at 2138 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-G81 - "20:49 UT" - Twelve Plutinos


MPEC 2011-G80 - "19:48 UT" - 2004 VV130


MPEC 2011-G79 - "16:11 UT" - 2003 GR


MPEC 2011-G78 - "12:40 UT" - 2011 GE62


MPEC 2011-G77 - "12:35 UT" - 2011 GD62


MPEC 2011-G76 - "12:27 UT" - 2011 GC62


<< DOU on 13 Apr. '11 >>  MPEC 2011-G75 - "07:12 UT" - Daily Orbit Update


MPEC 2011-G74 - "04:52 UT" - 2011 GA62

Observers  on 13 April '11

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-G79 -- 2003 GR
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-G77 -- 2011 GD62
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2011-G75, 2011-G77 & 2011-G78 -- 2011 GG60, 2011 GE62, 2011 GD62, 2008 FU6, 2004 FU4, 53435, 252793, 141531, 7753, 4401
8074J.-M. Petit & JJ Kavelaars via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-G81 -- 2004 HZ78
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2011-G74, 2011-G75 & 2011-G77 -- 2011 GD62, 2011 GA62, 2011 GA55
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 3 in MPEC 2011-G75 -- 2011 GF, 2011 GC60, 2011 EM51
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-G74 -- 2011 GA62
J95Great Shefford Obs. in England, 1 in MPEC 2011-G75 -- 2011 GP59
715Jornada Obs. in New Mexico, 1 in MPEC 2011-G75 -- 2003 FF5
6958J.W. Parker & J.-M. Petit via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPECs 2011-G80 & 2011-G81 -- 2005 CD81, 2004 VZ130, 2004 VY130, 2004 VX130, 2004 VV130, 2004 KC19, 2004 HA79
704LINEAR in New Mexico, 7 in MPECs 2011-G75 & 2011-G76 -- 2011 GC62, 2011 FS29, 2009 KT21, 1999 TK12, 256670, 162781, 11885
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-G77 -- 2011 GD62
568{JJ Kavelaars on Mauna Kea in Hawaii, 13 in MPECs 2011-G80 & 2011-G81 -- 2005 CD81, 2004 VZ130, 2004 VY130, 2004 VX130, 2004 VV130, 2004 MS8, 2004 KC19, 2004 KB19, 2004 HZ78, 2004 HY78, 2004 HX78, 2004 HB79, 2004 HA79
108Montelupo Obs. in Italy, 2 in MPEC 2011-G75 -- 2011 GP59, 2008 FU6
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-G75, 2011-G76 & 2011-G78 -- 2011 GE62, 2011 GC62, 2006 UA, 2006 SU114
6758Brett Gladman via Mt. Palomar in southern California, 6 in MPECs 2011-G80 & 2011-G81 -- 2004 VZ130, 2004 VY130, 2004 VX130, 2004 VV130, 2004 MS8, 2004 HY78
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2011-G75 -- 2010 NZ1, 2006 SU114
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2011-G75 -- 2006 SU114
A24New Millennium Obs. in Italy, 31 in MPEC 2011-G75 -- 2011 CH71, 2011 AN16, 2010 WQ7, 2010 RO82, 2007 EX, 2002 TD60, 1999 XR35, 96590, 86667, 85953, 68350, 34613, 256412, 251346, 23187, 23183, 22771, 198856, 18882, 164400, 163412, 163081, 162421, 159635, 137084, 11885, 102873, 4660, 3122, 2062, 1864
J69North Obs. in England, 1 in MPEC 2011-G75 -- 2011 GP59
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2011-G74 & 2011-G75 -- 2011 GA62, 2009 DV42, 2001 HA8, 17274
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-G75 -- 2001 QP181, 267729
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-G75 -- 2011 GP59
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 5 in MPECs 2011-G75 & 2011-G77 -- 2011 GP59, 2011 GD62, 2011 GB55, 2011 GA55, 2011 FS29
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-G76 & 2011-G78 -- 2011 GE62, 2011 GC62
H36Sandlot Obs. in Kansas, 5 in MPECs 2011-G75 & 2011-G78 -- 2011 GP59, 2011 GE62, 2011 GE, 2011 FG41, 2011 EM51
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-G77 -- 2011 GD62
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2011-G75 & 2011-G77 -- 2011 GN44, 2011 GG3, 2011 GD62, 2011 GB, 2011 FV9, 2011 FS6, 2011 FQ29, 2011 FG41, 2011 FC29
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-G75 -- 2003 TK2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 April '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2138 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. Both also post impact solutions beyond 100 years for a few special 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
2011 GN44JPL Sentry16032018-2110441.3e-06-2.00-2.350JPL: "Analysis based on 23 observations spanning 8.8684 days (2011-Apr-03.44279 to 2011-Apr-12.31121)." Diameter approximately 0.692 km. from mean, weighted H=18.4.
NEODyS16032018-2088298.86e-07-1.95-2.180NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-12.312."

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 13 April '11

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

2138Grabbed MPEC 2011-G80 - 2004 VV130 - see above
Grabbed MPEC 2011-G81 - Twelve Plutinos - see above
1715Grabbed MPEC 2011-G79 - 2003 GR - see above
1603Noted that JPL Sentry has updated its 2011 GN44 risk assessment - see above
Noted that NEODyS has updated its 2011 GN44 risk assessment - see above
Grabbed MPEC 2011-G75 - Daily Orbit Update - see above
Grabbed MPEC 2011-G76 - 2011 GC62 - see above
Grabbed MPEC 2011-G77 - 2011 GD62 - see above
Grabbed MPEC 2011-G78 - 2011 GE62 - see above
0459Grabbed MPEC 2011-G74 - 2011 GA62 - see above