Contents  on 9 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 9 April '11

The MPC's NEO Confirmation Page has 9 listings: 9 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of fifteen 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 9 April '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-G64 - "21:16 UT" - 2011 GC60


MPEC 2011-G63 - "12:21 UT" - 2011 GR59


MPEC 2011-G62 - "12:05 UT" - 2011 GQ59


<< DOU on 9 Apr. '11 >>  MPEC 2011-G61 - "07:11 UT" - Daily Orbit Update


MPEC 2011-G60 - "02:20 UT" - 2011 GP59

Observers  on 9 April '11

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2011-G61 & 2011-G62 -- 2011 GQ59, 2011 GL44, 2011 GF, 2011 GB3, 2011 FR6
A81Balzaretto Obs. in Italy, 1 in MPEC 2011-G64 -- 2011 GC60
300Bisei Spaceguard Center in Japan, 41 in MPECs 2011-G61 & 2011-G64 -- 2011 GF, 2011 GC60, 2011 FB29, 2011 EU29, 2011 EK, 2011 EG17, 2011 ED78, 2011 DV, 2011 DU, 2011 DO, 2011 DD5, 2011 CY46, 2011 BX10, 2011 BO59, 2011 BJ24, 2011 BA12, 2011 AO52, 2011 AN16, 2011 AF37, 2010 XZ67, 2010 UX7, 2010 TH19, 2009 KT21, 2009 EN2, 2009 DV42, 2008 FU6, 2008 AH33, 2007 EX, 2006 GY2, 2004 FU4, 2004 EV9, 2004 EK1, 2004 CK39, 2002 TD60, 2001 QP181, 2000 JE5, 253841, 154656, 138883, 4954, 3554
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2011-G61 & 2011-G62 -- 2011 GQ59, 2011 FT53, 85953, 263976, 234341, 7480
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2011-G61 -- 2011 GZ54, 2011 GO27, 2011 GN44, 2011 GM44, 2011 GE3, 2011 FT2, 2011 EZ40, 2011 ET4
J18Churchstoke Obs. in Wales, 1 in MPEC 2011-G62 -- 2011 GQ59
176Consell Obs. in Spain, 3 in MPECs 2011-G60, 2011-G61 & 2011-G62 -- 2011 GQ59, 2011 GP59, 2011 GA
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-G61 -- 22771
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2011-G60 & 2011-G62 -- 2011 GQ59, 2011 GP59
J95Great Shefford Obs. in England, 3 in MPECs 2011-G60, 2011-G61 & 2011-G62 -- 2011 GZ2, 2011 GQ59, 2011 GP59
A17Guidestar Obs. in Germany, 6 in MPECs 2011-G61, 2011-G62 & 2011-G64 -- 2011 GQ59, 2011 GF, 2011 GC60, 2011 GC55, 2011 GB3, 267494
B86Hagen Obs. in Germany, 1 in MPEC 2011-G62 -- 2011 GQ59
704LINEAR in New Mexico, 6 in MPECs 2011-G61, 2011-G63 & 2011-G64 -- 2011 GR59, 2011 GC60, 2002 TD60, 85953, 263976, 137170
J75La Sagra Obs. in Spain, 1 in MPEC 2011-G60 -- 2011 GP59
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2011-G62, 2011-G63 & 2011-G64 -- 2011 GR59, 2011 GQ59, 2011 GC60
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2011-G61 -- 2011 AO52, 2010 VN65
A99Monte Baldo Obs. in Italy, 1 in MPEC 2011-G60 -- 2011 GP59
J93Mt. Tuffley Obs. in England, 2 in MPEC 2011-G61 -- 85953, 3554
I89Nerpio Obs. in Italy, 1 in MPEC 2011-G60 -- 2011 GP59
A24New Millennium Obs. in Italy, 10 in MPECs 2011-G61 & 2011-G62 -- 2011 GQ59, 2011 AN16, 2010 WQ7, 36284, 23187, 23183, 22771, 204232, 8507, 4660
089Nikolaev Obs. in the Ukraine, 2 in MPEC 2011-G61 -- 2003 UV11, 152952
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2011-G61 -- 85953
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2011-G61 -- 1999 TK12, 25916, 243147, 175189, 170903, 137199, 136564, 1916
233San Vito Obs. in Italy, 1 in MPEC 2011-G61 -- 260141
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-G61 -- 2011 GL44
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-G62 -- 2011 GQ59
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-G61 -- 2011 GZ54, 2011 GM44
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2011-G61 -- 2007 HF44, 2007 GD49, 2005 LG8, 2005 GP21, 2001 QP181, 2000 PO30, 89958, 65803
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2011-G61 & 2011-G62 -- 2011 GQ59, 2011 GP59, 2011 GE
G56Walnut Creek Obs. in northern California, 2 in MPECs 2011-G63 & 2011-G64 -- 2011 GR59, 2011 GC60
198Wildberg Obs. in Germany, 1 in MPEC 2011-G60 -- 2011 GP59
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 GR59JPL Sentry15372014-2090152.9e-08-6.81-7.380JPL: "Analysis based on 16 observations spanning 1.0630 days (2011-Apr-08.18328 to 2011-Apr-09.24625)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
2011 GP59NEODyS15372086-208612.7e-09-8.58-8.580NEODyS: "Based on 86 optical observations (of which 4 are rejected as outliers) from 2011-04-08.944 to 2011-04-09.091."
2011 GN44JPL Sentry15372025-2110642.6e-07-2.79-3.470JPL: "Analysis based on 13 observations spanning 4.7854 days (2011-Apr-03.44279 to 2011-Apr-08.22823)." Diameter approximately 0.717 km. from mean, weighted H=18.4.
NEODyS15372018-2089712.15e-07-2.58-3.180NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-08.229."
2011 GAJPL Sentry15372031-209365.7e-09-6.12-6.410JPL: "Analysis based on 35 observations spanning 7.6556 days (2011-Apr-01.33339 to 2011-Apr-08.98899)." Diameter approximately 0.199 km. from mean, weighted H=21.2.
NEODyS15372031-203112.5e-09-6.21-6.210NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2011-04-01.334 to 2011-04-08.990."

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 9 April '11

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

2209Grabbed MPEC 2011-G64 - 2011 GC60 - see above
1537Noted that JPL Sentry has updated its 2011 GA risk assessment - see above
Noted that NEODyS has updated its 2011 GA risk assessment - see above
Noted that JPL Sentry has updated its 2011 GN44 risk assessment - see above
Noted that NEODyS has updated its 2011 GN44 risk assessment - see above
Noted that NEODyS has posted 2011 GP59 as an impact risk - see above
Noted that JPL Sentry has posted 2011 GR59 as an impact risk - see above
Grabbed MPEC 2011-G61 - Daily Orbit Update - see above
Grabbed MPEC 2011-G62 - 2011 GQ59 - see above
Grabbed MPEC 2011-G63 - 2011 GR59 - see above
0315Grabbed MPEC 2011-G60 - 2011 GP59 - see above