Contents  on 2 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 2 April '11

The MPC's NEO Confirmation Page has 18 listings: 18 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen updated listings. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 35 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 2 April '11

Minor Planet Electronic Circulars

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


MPEC 2011-G20 - "20:48 UT" - 2011 GE2


MPEC 2011-G19 - "18:26 UT" - 2010 EO65


MPEC 2011-G18 - "18:00 UT" - 2011 GD2


MPEC 2011-G17 - "10:24 UT" - 2011 GF


MPEC 2011-G16 - "10:18 UT" - 2011 GE


MPEC 2011-G15 - "10:11 UT" - 2011 GD


MPEC 2011-G14 - "10:05 UT" - 2011 GC


MPEC 2011-G13 - "10:00 UT" - 2011 GB


MPEC 2011-G12 - "09:53 UT" - 2011 GA


MPEC 2011-G11 - "09:47 UT" - 2011 FG41


MPEC 2011-G10 - "09:42 UT" - 2011 FF41


MPEC 2011-G09 - "09:36 UT" - 2011 FE41


<< DOU on 2 Apr. '11 >>  MPEC 2011-G08 - "07:08 UT" - Daily Orbit Update

Observers  on 2 April '11

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-G09 -- 2011 FE41
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-G14 & 2011-G17 -- 2011 GF, 2011 GC
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2011-G08, 2011-G14, 2011-G15 & 2011-G17 -- 2011 GF, 2011 GD, 2011 GC, 2011 FY2, 2011 CY6, 2007 DU103, 2002 SS41, 24445, 136617, 11405, 8507, 3199, 1916
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2011-G12, 2011-G14, 2011-G15, 2011-G16 & 2011-G17 -- 2011 GF, 2011 GE, 2011 GD, 2011 GC, 2011 GA
176Consell Obs. in Spain, 2 in MPECs 2011-G14 & 2011-G17 -- 2011 GF, 2011 GC
448Desert Moon Obs. in New Mexico, 5 in MPEC 2011-G08 -- 2011 EW29, 2011 EM51, 2011 DS9, 267494, 154656
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-G17 -- 2011 GF
J95Great Shefford Obs. in England, 2 in MPECs 2011-G16 & 2011-G17 -- 2011 GF, 2011 GE
682Kanab Obs. in Utah, 1 in MPEC 2011-G08 -- 164207
585Kiev Comet Station in the Ukraine, 1 in MPEC 2011-G08 -- 137170
704LINEAR in New Mexico, 7 in MPECs 2011-G08 & 2011-G15 -- 2011 GD, 2011 EW29, 2008 SO, 2004 FG1, 85953, 24445, 145656
6885Larry Wasserman via Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2011-G19 -- 2010 EO65
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-G09, 2011-G10, 2011-G11 & 2011-G13 -- 2011 GB, 2011 FG41, 2011 FF41, 2011 FE41
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-G17 -- 2011 GF
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2011-G08, 2011-G12, 2011-G16, 2011-G17, 2011-G18, 2011-G19 & 2011-G20 -- 2011 GF, 2011 GE2, 2011 GE, 2011 GD2, 2011 GA, 2010 EO65, 251346, 5693, 2202
A24New Millennium Obs. in Italy, 32 in MPEC 2011-G08 -- 2011 CH71, 2011 BO59, 2009 EN2, 2002 TD60, 1999 TK12, 99935, 89830, 85990, 40267, 267136, 265196, 256412, 250614, 234341, 23183, 228368, 22771, 215167, 21374, 163412, 15745, 152889, 144332, 8176, 7480, 6455, 5646, 4954, 4401, 3554, 3122, 1864
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2011-G08, 2011-G09, 2011-G10, 2011-G11 & 2011-G13 -- 2011 GB, 2011 FG41, 2011 FF41, 2011 FE41, 2011 FC29
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2011-G08, 2011-G14 & 2011-G15 -- 2011 GD, 2011 GC, 2011 FT29
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2011-G14, 2011-G15 & 2011-G17 -- 2011 GF, 2011 GD, 2011 GC
H36Sandlot Obs. in Kansas, 3 in MPECs 2011-G11, 2011-G13 & 2011-G20 -- 2011 GE2, 2011 GB, 2011 FG41
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-G08 -- 2001 QP181
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2011-G08, 2011-G09, 2011-G10, 2011-G11, 2011-G12, 2011-G13 & 2011-G16 -- 2011 GE, 2011 GB, 2011 GA, 2011 FY22, 2011 FG41, 2011 FF41, 2011 FE41, 2011 EM51
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-G16 & 2011-G17 -- 2011 GF, 2011 GE
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 GE2JPL Sentry2359207617.7e-10-7.40-7.400JPL: "Analysis based on 11 observations spanning .99259 days (2011-Apr-01.43027 to 2011-Apr-02.42286)." Diameter approximately 0.170 km. from mean, weighted H=21.5.
2011 GBJPL Sentry16232042-2105164.1e-07-6.84-7.080JPL: "Analysis based on 11 observations spanning .95506 days (2011-Apr-01.33493 to 2011-Apr-02.28999)." Diameter approximately 0.030 km. from mean, weighted H=25.3.
2004 FU162JPL Sentry03042011-21107835.2e-05-5.30-5.980JPL: "Analysis based on 4 observations spanning .03055 days (2004-Mar-31.27744 to 2004-Mar-31.30799)." Diameter approximately 0.006 km. from mean, weighted H=29.0.

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 2 April '11

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

2359Noted that JPL Sentry has posted 2011 GE2 as an impact risk - see above
2107Grabbed MPEC 2011-G20 - 2011 GE2 - see above
1954Grabbed MPEC 2011-G18 - 2011 GD2 - see above
Grabbed MPEC 2011-G19 - 2010 EO65 - see above
1623Noted that JPL Sentry has posted 2011 GB as an impact risk - see above
Grabbed MPEC 2011-G08 - Daily Orbit Update - see above
Grabbed MPEC 2011-G09 - 2011 FE41 - see above
Grabbed MPEC 2011-G10 - 2011 FF41 - see above
Grabbed MPEC 2011-G11 - 2011 FG41 - see above
Grabbed MPEC 2011-G12 - 2011 GA - see above
Grabbed MPEC 2011-G13 - 2011 GB - see above
Grabbed MPEC 2011-G14 - 2011 GC - see above
Grabbed MPEC 2011-G15 - 2011 GD - see above
Grabbed MPEC 2011-G16 - 2011 GE - see above
Grabbed MPEC 2011-G17 - 2011 GF - see above
0304Noted that JPL Sentry has updated its 2004 FU162 risk assessment - see above