Contents  on 4 May '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 4 May '11

The Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) was not checked on this day.

New MPECs  on 4 May '11

Minor Planet Electronic Circulars

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


MPEC 2011-J19 - "23:21 UT" - 2011 JY1


MPEC 2011-J18 - "23:20 UT" - 2011 JX1


MPEC 2011-J17 - "23:19 UT" - 2011 HD63


<< DOU on 4 May '11 >>  MPEC 2011-J16 - "07:08 UT" - Daily Orbit Update


MPEC 2011-J15 - "01:25 UT" - 2011 JE1


MPEC 2011-J14 - "01:23 UT" - 2011 JD1

Observers  on 4 May '11

A total of 25 observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-J19 -- 2011 JY1
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2011-J14, 2011-J16 & 2011-J18 -- 2011 JX1, 2011 JD1, 2011 JA, 22771, 159857, 141525, 5869, 4660
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2011-J14, 2011-J18 & 2011-J19 -- 2011 JY1, 2011 JX1, 2011 JD1
J18Churchstoke Obs. in Wales, 3 in MPECs 2011-J16 & 2011-J18 -- 2011 JX1, 2011 HC24, 2011 HB53
448Desert Moon Obs. in New Mexico, 3 in MPEC 2011-J16 -- 2011 HS, 2011 GQ59, 2011 GL62
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-J16 -- 2011 GL62
J95Great Shefford Obs. in England, 4 in MPECs 2011-J14, 2011-J16, 2011-J18 & 2011-J19 -- 2011 JY1, 2011 JX1, 2011 JE1, 2011 JD1
A17Guidestar Obs. in Germany, 7 in MPEC 2011-J16 -- 2011 HT, 2011 HS, 2011 HQ, 2011 HL7, 2011 GQ65, 2010 TU5, 2004 GP
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2011-J16 -- 2011 JA, 2011 HB53
704LINEAR in New Mexico, 5 in MPECs 2011-J16 & 2011-J19 -- 2011 JY1, 89958, 267729, 141531, 3122
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2011-J14, 2011-J15, 2011-J17, 2011-J18 & 2011-J19 -- 2011 JY1, 2011 JX1, 2011 JE1, 2011 JD1, 2011 HD63
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2011-J15, 2011-J16 & 2011-J19 -- 2011 JY1, 2011 JE1, 2011 GL62, 2005 SA71, 18106, 7753, 5626, 3122
A13Naef Obs. in Switzerland, 1 in MPEC 2011-J16 -- 2011 GL62
A24New Millennium Obs. in Italy, 5 in MPEC 2011-J16 -- 2010 WQ7, 89830, 198856, 136617, 4954
J69North Obs. in England, 1 in MPEC 2011-J16 -- 164121
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2011-J16 & 2011-J17 -- 2011 HD63, 2010 UF7, 248818, 22753, 144901, 137062
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2011-J16 -- 23187
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-J16 -- 85490
H36Sandlot Obs. in Kansas, 4 in MPECs 2011-J15, 2011-J16 & 2011-J18 -- 2011 JX1, 2011 JE1, 2011 HR, 2011 HB53
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2011-J14 & 2011-J16 -- 2011 JD1, 2010 WP8, 108519, 3554
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-J16 -- 2004 FU4, 24445
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-J16 -- 2011 HE24, 2011 GX65, 152941
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-J15 & 2011-J19 -- 2011 JY1, 2011 JE1
C44Volta Obs. in Italy, 1 in MPEC 2011-J19 -- 2011 JY1
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-J19 -- 2011 JY1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 May '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 JKNEODyS14492018-2090169.27e-08-3.51-3.660NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-05-01.141 to 2011-05-03.895."
JPL Sentry01302016-21112203.8e-07-3.13-3.730JPL: "Analysis based on 20 observations spanning 2.7541 days (2011-May-01.13984 to 2011-May-03.89394)." Diameter approximately 0.658 km. from mean, weighted H=18.6.
2011 HB53JPL Sentry1449208411.1e-10-6.19-6.190JPL: "Analysis based on 26 observations spanning 4.9255 days (2011-Apr-29.26387 to 2011-May-04.18939)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
NEODyS14492046-208452.84e-10-5.52-5.890NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-04-29.265 to 2011-05-04.190."
2009 BDJPL Sentry21172078-210871.9e-05-6.74-6.870JPL: "Analysis based on 121 observations spanning 289.19 days (2009-Jan-16.27641 to 2009-Nov-01.468038)." Diameter approximately 0.007 km. from mean, weighted H=28.4.

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 4 May '11

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

2359Grabbed MPEC 2011-J17 - 2011 HD63 - see above
Grabbed MPEC 2011-J18 - 2011 JX1 - see above
Grabbed MPEC 2011-J19 - 2011 JY1 - see above
2117Noted that JPL Sentry has updated its 2009 BD risk assessment - see above
1449Noted that JPL Sentry has updated its 2011 HB53 risk assessment - see above
Noted that NEODyS has updated its 2011 HB53 risk assessment - see above
Noted that NEODyS has posted 2011 JK as an impact risk - see above
Grabbed MPEC 2011-J16 - Daily Orbit Update - see above
0130Noted that JPL Sentry has posted 2011 JK as an impact risk - see above
Grabbed MPEC 2011-J14 - 2011 JD1 - see above
Grabbed MPEC 2011-J15 - 2011 JE1 - see above