Contents  on 5 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 5 May '11

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

New MPECs  on 5 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-J25 - "19:44 UT" - 2008 QD1


MPEC 2011-J24 - "16:20 UT" - Comet C/2011 H1 (Lemmon)


MPEC 2011-J23 - "13:49 UT" - 2011 JU2


<< DOU on 5 May '11 >>  MPEC 2011-J22 - "07:08 UT" - Daily Orbit Update


MPEC 2011-J21 - "01:09 UT" - 2008 JV2


MPEC 2011-J20 - "00:51 UT" - 2009 WL1

Observers  on 5 May '11

A total of 26 observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2011-J22 & 2011-J25 -- 2011 HS4, 2011 HR60, 2011 HP, 2011 HO5, 2011 HL7, 2011 HH1, 2011 HC24, 2011 GZ54, 2011 GQ65, 2008 QD1
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-J22 & 2011-J24 -- 2011 HO, C/2011 H1, 2005 UO5, 136617
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2011-J20, 2011-J22 & 2011-J23 -- 2011 JU2, 2011 JE1, 2011 HT, 2011 HS4, 2011 HO5, 2011 HJ7, 2011 HH, 2011 HC36, 2011 HC24, 2011 GL44, 2011 GF, 2011 GC, 2011 BA12, 2009 WL1
J18Churchstoke Obs. in Wales, 1 in MPEC 2011-J22 -- 2011 JE1
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-J23 -- 2011 JU2
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-J22 -- 2011 GL62
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2011-J22 -- 2011 HO5
704LINEAR in New Mexico, 13 in MPECs 2011-J21 & 2011-J22 -- 2011 JY1, 2011 JD1, 2011 GC60, 2008 JV2, 2006 SV134, 2004 FU4, 2001 QP181, 89958, 24445, 141531, 8507, 5626, 4401
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-J22 & 2011-J23 -- 2011 JU2, 2011 AG5
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-J24 -- C/2011 H1
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-J23 & 2011-J24 -- 2011 JU2, C/2011 H1
A24New Millennium Obs. in Italy, 11 in MPEC 2011-J22 -- 2004 FG1, 2002 TD60, 89958, 53435, 274138, 260141, 24445, 23187, 144332, 141525, 4401
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2011-J22 -- 2011 HL7, 2011 GL62, 2011 GL60, 2011 EZ78, 2007 LQ19, 2001 QP181, 1866
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-J24 -- C/2011 H1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-J23 -- 2011 JU2
233San Vito Obs. in Italy, 1 in MPEC 2011-J22 -- 4954
H36Sandlot Obs. in Kansas, 3 in MPEC 2011-J22 -- 2011 HO5, 2011 HH1, 2003 LG
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-J22 & 2011-J23 -- 2011 JU2, 2011 JL
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-J22 -- 20086
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2011-J22 -- 2011 HH, 1999 HD1, 1998 HK49, 86326, 189263
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2011-J22, 2011-J23 & 2011-J24 -- 2011 JU2, 2011 JK, C/2011 H1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-J23 -- 2011 JU2
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-J22 -- 163250
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-J23 -- 2011 JU2
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-J24 -- C/2011 H1
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-J22 -- 2011 JA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 JKJPL Sentry15022018-2107401.6e-08-4.41-4.750JPL: "Analysis based on 23 observations spanning 3.0204 days (2011-May-01.13984 to 2011-May-04.16019)." Diameter approximately 0.652 km. from mean, weighted H=18.6.
NEODyS1502R E M O V E D-
2011 HD63NEODyS15022052-208062.72e-09-7.13-7.620NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-04-30.401 to 2011-05-04.314."
JPL Sentry01032052-207651.1e-09-7.43-7.780JPL: "Analysis based on 12 observations spanning 3.9135 days (2011-Apr-30.399924 to 2011-May-04.31338)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
2011 HJ7JPL Sentry1502209411.3e-09-7.63-7.630JPL: "Analysis based on 18 observations spanning 6.9117 days (2011-Apr-26.21907 to 2011-May-03.13077)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
2011 HO5JPL Sentry15022051-21091453.8e-05-4.34-4.880JPL: "Analysis based on 36 observations spanning 7.0022 days (2011-Apr-27.39956 to 2011-May-04.40171)." Diameter approximately 0.050 km. from mean, weighted H=24.2.
NEODyS15022051-2090652.4e-05-4.54-4.910NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2011-04-27.400 to 2011-05-04.402."
2011 AG5NEODyS15022031-2058212.23e-04-1.99-2.01NEODyS: "Based on 125 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-05-04.459."

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 May '11

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

2000Grabbed MPEC 2011-J25 - 2008 QD1 - see above
1650Grabbed MPEC 2011-J24 - Comet C/2011 H1 (Lemmon) - see above
1502Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has posted 2011 HD63 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 HJ7 risk assessment - see above
Noted that JPL Sentry has updated its 2011 HO5 risk assessment - see above
Noted that NEODyS has updated its 2011 HO5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 JK risk assessment - see above
Noted that NEODyS has removed 2011 JK as an impact risk - see above
Grabbed MPEC 2011-J22 - Daily Orbit Update - see above
Grabbed MPEC 2011-J23 - 2011 JU2 - see above
0133Grabbed MPEC 2011-J21 - 2008 JV2 - see above
0104Grabbed MPEC 2011-J20 - 2009 WL1 - see above
0103Noted that JPL Sentry has posted 2011 HD63 as an impact risk - see above