Contents  on 15 April '11

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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 15 April '11

The MPC's NEO Confirmation Page has 12 listings: 5 new, 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five new and seven updated listings. Of these, five were "one nighters." The Tracking News counted a total of fourteen listings on the NEOCP on this day.

New MPECs  on 15 April '11

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-G90 - "16:53 UT" - Observations and Orbits of Comets


<< DOU on 15 Apr. '11 >>  MPEC 2011-G89 - "07:14 UT" - Daily Orbit Update

Observers  on 15 April '11

A total of 64 observers appeared in this day's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2011-G90 -- C/2009 F4
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2011-G89 -- 2011 GZ54, 2011 GS60, 2011 GR59, 2011 GQ59, 2011 GJ44, 2011 GG60, 2011 GE62, 2011 GD60, 2011 GC60, 2011 GC, 2011 FZ2, 2010 UF7
J51Atlante Obs. in the Canary Islands, 4 in MPEC 2011-G90 -- C/2011 A3, C/2010 X1, 240P, 29P
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-G90 -- C/2011 C1
B96Brixiis Obs. in Belgium, 6 in MPEC 2011-G90 -- C/2011 A3, C/2010 X1, C/2010 G2, C/2008 FK75, 71P, 29P
J02Busot Obs. in Spain, 1 in MPEC 2011-G90 -- C/2007 VO53
235CAST Obs. in Italy, 1 in MPEC 2011-G90 -- C/2010 X1
J96Cantabria Obs. in Spain, 1 in MPEC 2011-G90 -- C/2010 G2
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2011-G89 & 2011-G90 -- 2011 GC55, 240P
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2011-G89 -- 2011 GZ54, 2011 GS60, 2011 GM44, 2011 GD62, 2011 GC55, 2011 GB55, 2011 GA62, 2011 GA55, 2011 FY22, 2011 FS29, 2011 EW29
A77Chante-Perdrix Obs. in France, 3 in MPEC 2011-G90 -- C/2011 C1, C/2006 S3, 29P
J01Cielo Profundo Obs. in Spain, 8 in MPEC 2011-G90 -- C/2011 F1, C/2011 C1, C/2011 A3, P/2011 A2, C/2010 X1, C/2010 G2, C/2005 L3, 29P
850Cordell-Lorenz Obs. in Tennessee, 3 in MPEC 2011-G90 -- C/2011 A3, C/2007 D1, 73P
958Dax Obs. in France, 20 in MPEC 2011-G90 -- C/2011 F1, C/2011 C1, C/2011 A3, P/2011 A2, C/2010 X1, C/2010 J2, C/2010 G2, C/2009 UG89, C/2009 F2, C/2007 VO53, C/2007 Q3, C/2006 S3, C/2005 L3, 240P, 123P, 103P, 73P, 71P, 43P, 29P
448Desert Moon Obs. in New Mexico, 3 in MPEC 2011-G89 -- 2011 GR59, 2011 GC60, 2011 FY2
J19El Maestrat Obs. in Spain, 1 in MPEC 2011-G90 -- C/2010 G2
372Geisei Obs. in Japan, 1 in MPEC 2011-G90 -- C/2010 X1
355Hadano Obs. in Japan, 5 in MPEC 2011-G90 -- C/2011 F1, C/2011 C1, C/2011 A3, C/2010 X1, C/2010 G2
B86Hagen Obs. in Germany, 1 in MPEC 2011-G89 -- 2011 GP59
D88Hiratsuka Obs. in Japan, 4 in MPEC 2011-G90 -- C/2011 F1, C/2011 A3, C/2010 X1, C/2005 L3
H15ISON-NM Obs. in New Mexico, 6 in MPEC 2011-G90 -- C/2011 F1, C/2011 C1, C/2011 A3, C/2010 X1, 48P, 30P
A21Irmtraut Obs. in Germany, 1 in MPEC 2011-G90 -- 240P
682Kanab Obs. in Utah, 1 in MPEC 2011-G89 -- 141432
585Kiev Comet Station in the Ukraine, 5 in MPEC 2011-G90 -- C/2011 C1, P/2011 A1, P/2010 WK, 247P, 231P
400Kitami Obs. in Japan, 3 in MPEC 2011-G90 -- C/2011 F1, C/2011 A3, C/2009 UG89
704LINEAR in New Mexico, 5 in MPEC 2011-G90 -- C/2011 A3, P/2011 A2, C/2009 UG89, 162P, 43P
J31La Axarquia Obs. in Spain, 2 in MPEC 2011-G90 -- C/2010 X1, 29P
212La Dehesilla Obs. in Spain, 6 in MPEC 2011-G90 -- C/2011 A3, C/2010 X1, C/2009 F2, C/2005 L3, 123P, 103P
J38La Vara Obs. in Spain, 5 in MPEC 2011-G90 -- C/2010 X1, C/2010 G2, 240P, 123P, 73P
130Lumezzane Obs. in Italy, 5 in MPEC 2011-G90 -- C/2011 F1, C/2010 X1, 231P, 228P, 71P
B82Maidbronn Obs. in Germany, 5 in MPEC 2011-G90 -- C/2011 F1, P/2010 C1, 240P, 231P, 152P
C10Maisoncelles Obs. in France, 6 in MPEC 2011-G90 -- C/2011 C1, C/2011 A3, C/2010 X1, 240P, 115P, 73P
232Masquefa Obs. in Spain, 2 in MPEC 2011-G90 -- C/2010 X1, 29P
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-G89 -- 2011 EZ40
213Montcabre Obs. in Spain, 2 in MPEC 2011-G90 -- 240P, 29P
945Monte Deva Obs. in Spain, 1 in MPEC 2011-G90 -- C/2010 G2
108Montelupo Obs. in Italy, 1 in MPEC 2011-G90 -- 29P
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-G89 & 2011-G90 -- 2011 GS60, C/2010 X1, 2004 FU4, 240P
J47Nazaret Obs. in Spain, 4 in MPEC 2011-G90 -- C/2010 X1, 240P, 103P, 29P
A24New Millennium Obs. in Italy, 16 in MPEC 2011-G89 -- 2011 CH71, 2011 AN16, 2010 RO82, 86667, 68350, 34613, 256412, 248083, 23187, 21374, 198856, 164400, 163081, 4660, 3122, 1864
423North Ryde Obs. in New South Wales, 1 in MPEC 2011-G90 -- C/2011 G1
C23Olmen Obs. in Belgium, 6 in MPEC 2011-G90 -- C/2011 A3, C/2010 X1, C/2010 G2, C/2009 UG89, 240P, 29P
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2011-G89 & 2011-G90 -- 2010 LM68, 2009 DV42, 2006 SV134, 2006 GY2, 2004 RH340, 203P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2011-G90 -- C/2011 F1, C/2010 X1, C/2010 G2, 29P
J52Pinsoro Obs. in Spain, 9 in MPEC 2011-G90 -- C/2011 C1, C/2011 A3, C/2010 X1, C/2010 G2, C/2006 S3, C/2005 L3, 240P, 103P, 29P
5611Janos Kelemen via Piszkesteto Sta. in Hungary, 5 in MPEC 2011-G90 -- C/2011 A3, P/2011 A2, P/2011 A1, C/2010 X1, C/2005 L3
941Pla D'Arguines Obs. in Spain, 4 in MPEC 2011-G90 -- C/2011 A3, C/2010 L3, C/2007 M1, 31P
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 3 in MPEC 2011-G90 -- C/2011 C1, 213P, 115P
E03`Kevin Hills in England via RAS Obs. Victoria in Victoria, 1 in MPEC 2011-G90 -- C/2011 G1
473Remanzacco Obs. in Italy, 1 in MPEC 2011-G90 -- C/2010 X1
939Rodeno Obs. in Spain, 5 in MPEC 2011-G90 -- C/2011 A3, C/2010 X1, 240P, 123P, 29P
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-G90 -- 82P
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-G89 -- 2011 GR59
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2011-G89 & 2011-G90 -- 2011 GB, 2011 GA, P/2011 A2, P/2010 H5, C/2010 F3, P/2010 C1
C36Starry Wanderer Obs., 1 in MPEC 2011-G90 -- C/2011 A3
A71Stixendorf Obs. in Austria, 2 in MPEC 2011-G90 -- C/2011 C1, C/2006 S3
I40TRAPPIST in Chile, 5 in MPEC 2011-G90 -- C/2010 X1, 103P, 29P, 10P, 9P
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-G89 -- 2011 GA62
H10Tzec Maun Obs. Mayhill in New Mexico, 11 in MPECs 2011-G89 & 2011-G90 -- C/2011 F1, C/2011 C1, P/2011 A2, C/2010 X1, C/2010 F3, 267494, 240P, 73P, 71P, 43P, 29P
D96Tzec Maun Obs. Moorook in South Australia, 2 in MPEC 2011-G90 -- C/2011 G1, 29P
H47Vicksburg Obs. in Mississippi, 7 in MPEC 2011-G90 -- C/2011 A3, P/2011 A2, C/2010 X1, C/2009 UG89, 103P, 43P, 29P
B42Vitebsk Obs. in Belarus, 4 in MPEC 2011-G90 -- C/2011 F1, C/2010 J2, C/2009 UG89, C/2007 Q3
C42Xingming Obs. in China, 1 in MPEC 2011-G90 -- 240P
367Yatsuka Obs. in Japan, 4 in MPEC 2011-G90 -- C/2011 F1, C/2011 A3, C/2010 X1, 29P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 April '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 GS60JPL Sentry1638R E M O V E DJPL: Risk listing removed at 1133 UTC.
NEODyS1638R E M O V E D-

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 15 April '11

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

1746Grabbed MPEC 2011-G90 - Observations and Orbits of Comets - see above
1638Noted that JPL Sentry has removed 2011 GS60 as an impact risk - see above
Noted that NEODyS has removed 2011 GS60 as an impact risk - see above
Grabbed MPEC 2011-G89 - Daily Orbit Update - see above