Contents  on 5 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 5 April '11

The MPC's NEO Confirmation Page has 19 listings: 5 new, 14 updated

When last checked at 2331 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five new and fourteen updated listings. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 26 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 5 April '11

Minor Planet Electronic Circulars

As of last check at 2340 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-G39 - "19:36 UT" - 2011 GR36


MPEC 2011-G38 - "13:41 UT" - 2011 GP28


<< DOU on 5 Apr. '11 >>  MPEC 2011-G37 - "07:10 UT" - Daily Orbit Update


MPEC 2011-G36 - "02:29 UT" - 2011 GO27

Observers  on 5 April '11

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-G37 -- 2011 BE38
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-G39 -- 2011 GR36
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2011-G37 -- 2011 FS29, 2008 FT6, 2004 FG1, 2062
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPECs 2011-G37, 2011-G38 & 2011-G39 -- 2011 GR36, 2011 GP28, 2011 GE3, 2011 GE, 2011 GD, 2011 GC, 2011 GB3, 2011 FY22, 2011 FY2, 2011 FS29, 2011 FQ17, 2011 FK1, 2011 FB29, 2011 CG2, 2011 BA12, 2010 YD3, 2010 XK52
J18Churchstoke Obs. in Wales, 3 in MPEC 2011-G37 -- 2011 GF, 2011 FS29, 2011 FB29
157Frasso Sabino Obs. in Italy, 2 in MPEC 2011-G37 -- 2011 GF, 2011 FS29
682Kanab Obs. in Utah, 1 in MPEC 2011-G37 -- 2011 GC
046Klet Obs. in the Czech Republic, 4 in MPEC 2011-G37 -- 2011 EM51, 2011 DV, 2011 AO52, 2004 FJ29
704LINEAR in New Mexico, 8 in MPEC 2011-G37 -- 2008 FU6, 2004 FJ29, 89958, 267729, 136874, 136617, 11885, 8507
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-G36, 2011-G37, 2011-G38 & 2011-G39 -- 2011 GR36, 2011 GP28, 2011 GO27, 2006 FV35, 31210, 159635, 137199
A24New Millennium Obs. in Italy, 10 in MPEC 2011-G37 -- 2011 AN16, 2008 SO, 89830, 23183, 22771, 215167, 204232, 15745, 11885, 4954
089Nikolaev Obs. in the Ukraine, 2 in MPEC 2011-G37 -- 2010 GU21, 2005 YU55
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2011-G36 & 2011-G37 -- 2011 GO27, 2011 GA, 2011 FQ29, 2008 XE3, 2006 GY2, 1998 KH9, 24445, 154035, 10860
J52Pinsoro Obs. in Spain, 2 in MPEC 2011-G37 -- 5786, 4954
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-G37 -- 5626
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-G37 -- 2011 FT29
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-G39 -- 2011 GR36
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-G38 & 2011-G39 -- 2011 GR36, 2011 GP28
204Schiaparelli Obs. in Italy, 18 in MPEC 2011-G37 -- 2011 EW74, 2011 EM51, 2011 EL51, 2011 EL17, 2011 ED41, 2011 BE38, 2008 SO, 2007 DU103, 2005 ES70, 2004 XN50, 2004 FX31, 2004 FU4, 2004 FG1, 2003 TN1, 2001 QP181, 2000 EY106, 267729, 267221
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-G37 -- 2001 QP181, 89958
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2011-G37 -- 2011 GE2, 2011 GB, 2011 GA, 2011 FR29, 2011 EX29, 2011 EU29, 2010 TK7
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-G37 & 2011-G39 -- 2011 GW9, 2011 GR36
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 April '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2341 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 GO27NEODyS16072017-2082241.72e-08-4.36-5.120NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-04-03.437 to 2011-04-04.408."
JPL Sentry04072017-2110352.2e-08-4.58-5.200JPL: "Analysis based on 13 observations spanning .97145 days (2011-Apr-03.43622 to 2011-Apr-04.40767)." Diameter approximately 0.587 km. from mean, weighted H=18.8.
2011 GE2NEODyS1607R E M O V E D-
2011 GBJPL Sentry1607R E M O V E DJPL: Risk listing removed at 1144 UTC.
2011 GAJPL Sentry16072020-2093554.7e-07-3.97-4.320JPL: "Analysis based on 20 observations spanning 2.9879 days (2011-Apr-01.33339 to 2011-Apr-04.32134)." Diameter approximately 0.203 km. from mean, weighted H=21.1.
NEODyS16072020-2090785.17e-07-3.90-4.290NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-04-01.334 to 2011-04-04.322."
2011 EU29JPL Sentry1607R E M O V E DJPL: Risk listing removed at 1052 UTC.

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 5 April '11

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

2000Grabbed MPEC 2011-G39 - 2011 GR36 - see above
1607Noted that JPL Sentry has removed 2011 EU29 as an impact risk - see above
Noted 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 removed 2011 GB as an impact risk - see above
Noted that NEODyS has removed 2011 GE2 as an impact risk - see above
Noted that NEODyS has posted 2011 GO27 as an impact risk - see above
Grabbed MPEC 2011-G37 - Daily Orbit Update - see above
Grabbed MPEC 2011-G38 - 2011 GP28 - see above
0407Noted that JPL Sentry has posted 2011 GO27 as an impact risk - see above
0242Grabbed MPEC 2011-G36 - 2011 GO27 - see above