Contents  on 3 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 3 April '11

The MPC's NEO Confirmation Page has 17 listings: 17 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen updated listings. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 23 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 3 April '11

Minor Planet Electronic Circulars

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


MPEC 2011-G28 - "23:36 UT" - 2011 FT53


MPEC 2011-G27 - "22:55 UT" - 2011 GE3


MPEC 2011-G26 - "22:48 UT" - 2011 GD3


MPEC 2011-G25 - "22:43 UT" - 2011 GC3


MPEC 2011-G24 - "19:41 UT" - 2011 GB3


MPEC 2011-G23 - "19:36 UT" - 2011 GA3


MPEC 2011-G22 - "19:29 UT" - 2011 GZ2


<< DOU on 3 Apr. '11 >>  MPEC 2011-G21 - "07:09 UT" - Daily Orbit Update

Observers  on 3 April '11

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-G21 -- 2011 FS29
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-G21 -- 4401
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2011-G21 -- 2011 GF, 2011 GB, 2011 FZ22, 2011 FS29, 2011 FR6, 2011 FQ29, 2011 FB29, 2011 EU29, 2011 EN40
300Bisei Spaceguard Center in Japan, 3 in MPECs 2011-G25, 2011-G26 & 2011-G27 -- 2011 GE3, 2011 GD3, 2011 GC3
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2011-G21 -- 2009 FT, 89830, 256412, 250614, 23187, 21374, 8176
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2011-G21, 2011-G25 & 2011-G26 -- 2011 GD3, 2011 GC3, 2011 FS29, 2011 EW74, 2011 EW29
J18Churchstoke Obs. in Wales, 1 in MPEC 2011-G21 -- 2011 ED78
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-G24 -- 2011 GB3
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-G21 -- 2011 FY2, 2011 FB29, 2011 ET29, 2011 CY6
113Drebach Obs. in Germany, 4 in MPEC 2011-G21 -- 2011 DS9, 2011 AN16, 2008 SO, 2003 FF5
151Eschenberg Obs. in Switzerland, 4 in MPEC 2011-G21 -- 2011 DU, 2011 DS9, 2004 FU4, 2004 FG1
J95Great Shefford Obs. in England, 4 in MPECs 2011-G22, 2011-G23, 2011-G25 & 2011-G26 -- 2011 GZ2, 2011 GD3, 2011 GC3, 2011 GA3
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2011-G24 -- 2011 GB3
682Kanab Obs. in Utah, 1 in MPEC 2011-G21 -- 2011 GC
046Klet Obs. in the Czech Republic, 10 in MPEC 2011-G21 -- 2011 EW29, 2011 EM51, 2011 DS9, 2011 CH71, 2011 AO52, 2011 AN16, 85953, 234341, 141531, 141525
704LINEAR in New Mexico, 13 in MPECs 2011-G21, 2011-G24 & 2011-G27 -- 2011 GF, 2011 GE3, 2011 GB3, 2011 FS29, 2011 EW29, 2008 SO, 2008 FU6, 2004 FG1, 85953, 267729, 250620, 24445, 5626
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-G22 -- 2011 GZ2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-G28 -- 2011 FT53
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-G21 -- 2004 FJ29
900Moriyama Obs. in Japan, 1 in MPEC 2011-G24 -- 2011 GB3
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2011-G21, 2011-G22, 2011-G23, 2011-G24, 2011-G26 & 2011-G27 -- 2011 GZ2, 2011 GE3, 2011 GD3, 2011 GB3, 2011 GA3, 2011 FY22, 2011 FS6, 2011 FR17, 1996 RG3, 31210, 159635, 10860
A13Naef Obs. in Switzerland, 2 in MPEC 2011-G21 -- 2008 FU6, 250620
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2011-G21, 2011-G25 & 2011-G28 -- 2011 GC3, 2011 GC, 2011 FT53
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2011-G21 -- 2008 FU6, 2004 FG1, 2002 TD60
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-G24 -- 2011 GB3
233San Vito Obs. in Italy, 2 in MPEC 2011-G21 -- 4954, 3122
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-G21 & 2011-G22 -- 2011 GZ2, 2011 FB29
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2011-G21 -- 89958, 7753, 6037
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2011-G21, 2011-G23 & 2011-G26 -- 2011 GD3, 2011 GA3, 2011 FG
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-G21 -- 2011 GE2
A78Stia Obs. in Italy, 4 in MPEC 2011-G21 -- 2011 CH71, 2011 BE38, 2011 AN16, 89830
G52Stone Edge Obs. in northern California, 1 in MPEC 2011-G21 -- 2004 FG1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 GZ2JPL Sentry21002034-210161.1e-05-5.08-5.250JPL: "Analysis based on 16 observations spanning 1.1718 days (2011-Apr-02.22286 to 2011-Apr-03.39462)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
2011 GE2NEODyS16012015-201511.7e-11-5.16-5.160NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-04-01.431 to 2011-04-02.424."
JPL Sentry1601R E M O V E DJPL: Risk listing removed at 1146 UTC.
2011 GBJPL Sentry16012088-210879.4e-08-7.48-7.780JPL: "Analysis based on 14 observations spanning .95506 days (2011-Apr-01.33493 to 2011-Apr-02.28999)." Diameter approximately 0.030 km. from mean, weighted H=25.3.
2011 GAJPL Sentry17252011-21105131.4e-06-2.77-2.860JPL: "Analysis based on 13 observations spanning 1.0105 days (2011-Apr-01.33339 to 2011-Apr-02.34391)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
NEODyS16012011-20902055.84e-07-2.97-3.030NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-04-01.334 to 2011-04-02.345."
2011 EU29JPL Sentry1601211014.9e-07-3.91-3.910JPL: "Analysis based on 91 observations spanning 24.967 days (2011-Mar-08.20041 to 2011-Apr-02.16788)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
NEODyS1601R 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 3 April '11

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

2359Grabbed MPEC 2011-G28 - 2011 FT53 - see above
2305Grabbed MPEC 2011-G25 - 2011 GC3 - see above
Grabbed MPEC 2011-G26 - 2011 GD3 - see above
Grabbed MPEC 2011-G27 - 2011 GE3 - see above
2100Noted that JPL Sentry has posted 2011 GZ2 as an impact risk - see above
2002Grabbed MPEC 2011-G22 - 2011 GZ2 - see above
Grabbed MPEC 2011-G23 - 2011 GA3 - see above
Grabbed MPEC 2011-G24 - 2011 GB3 - see above
1725Noted that JPL Sentry has posted 2011 GA as an impact risk - see above
1601Noted that JPL Sentry has updated its 2011 EU29 risk assessment - see above
Noted that NEODyS has removed 2011 EU29 as an impact risk - see above
Noted that NEODyS has posted 2011 GA as an impact risk - see above
Noted that JPL Sentry has updated its 2011 GB risk assessment - see above
Noted that JPL Sentry has removed 2011 GE2 as an impact risk - see above
Noted that NEODyS has posted 2011 GE2 as an impact risk - see above
Grabbed MPEC 2011-G21 - Daily Orbit Update - see above