Contents  on 3 September '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 September '11

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2322 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, two 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 September '11

Minor Planet Electronic Circulars

As of last check at 2322 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-R16 - "16:19 UT" - 2011 RF


MPEC 2011-R15 - "16:08 UT" - 2011 QH50


<< DOU on 3 Sept. '11 >>  MPEC 2011-R14 - "06:03 UT" - Daily Orbit Update


MPEC 2011-R13 - "03:15 UT" - 2011 QY39

Observers  on 3 September '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2011-R14, 2011-R15 & 2011-R16 -- 2011 RF, 2011 QS2, 2011 QH50, 2011 QC14, 2011 PU1, 2011 PU, 2011 PE2, 2011 OK5, 2005 VC, 2003 SK84
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-R14 -- 1998 SC15
G51Byrne Obs., 1 in MPEC 2011-R16 -- 2011 RF
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-R14 -- 2011 QY37, 2011 KF4
203GiaGa Obs. in Italy, 2 in MPEC 2011-R14 -- 2011 QF23, 2011 OQ5
J95Great Shefford Obs. in England, 2 in MPECs 2011-R13 & 2011-R16 -- 2011 RF, 2011 QY39
844Los Molinos Obs. in Uruguay, 4 in MPEC 2011-R14 -- 2011 PT1, 2011 PS, 2009 AV, 2006 UQ217
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2011-R16 -- 2011 RF
C10Maisoncelles Obs. in France, 1 in MPEC 2011-R14 -- 3200
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-R15 -- 2011 QH50
474Mt. John Obs. in New Zealand, 10 in MPECs 2011-R14 & 2011-R15 -- 2011 QY37, 2011 QX8, 2011 QJ21, 2011 QH50, 2011 QG9, 2011 QF48, 2011 QF23, 2011 QE48, 2011 QD48, 2011 QC46
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2011-R14 -- 2005 NX44
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2011-R13, 2011-R15 & 2011-R16 -- 2011 RF, 2011 QY39, 2011 QH50
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2011-R15 & 2011-R16 -- 2011 RF, 2011 QH50
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-R13 -- 2011 QY39
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-R15 & 2011-R16 -- 2011 RF, 2011 QH50
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2011-R14 -- 2011 QF48, 2003 FB, 54071, 1566
A78Stia Obs. in Italy, 2 in MPEC 2011-R14 -- 2011 OM5, 2011 JA8
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2011-R14 -- 2011 OV4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 September '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2322 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 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 QF48JPL Sentry1505206711.3e-07-6.86-6.860JPL: "Analysis based on 30 observations spanning 2.9563 days (2011-Aug-30.7015 to 2011-Sep-02.65777)." Diameter approximately 0.029 km. from mean, weighted H=25.4.
NEODyS15052067-208222.07e-07-6.70-6.840NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-08-30.702 to 2011-09-02.659."
2011 QD48JPL Sentry15052014-2111581.2e-07-2.89-3.040JPL: "Analysis based on 30 observations spanning 2.9596 days (2011-Aug-30.5432 to 2011-Sep-02.50278)." Diameter approximately 0.892 km. from mean, weighted H=17.9.
NEODyS15052014-2090361.39e-07-2.53-2.60NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-08-30.544 to 2011-09-02.504."
2011 PE2JPL Sentry15052027-210342.6e-04-2.20-2.200JPL: "Analysis based on 76 observations spanning 25.261 days (2011-Aug-08.06387 to 2011-Sep-02.325196)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS15052027-209035.88e-05-2.85-2.850NEODyS: "Based on 76 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-09-02.326."
2011 PU1JPL Sentry15052061-2102553.1e-04-3.84-4.250JPL: "Analysis based on 43 observations spanning 26.251 days (2011-Aug-06.9677 to 2011-Sep-02.21851)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
NEODyS15052058-20901164.08e-04-3.72-4.110NEODyS: "Based on 43 optical observations (of which 1 are rejected as outliers) from 2011-08-06.968 to 2011-09-02.219."

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 September '11

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

1847Grabbed MPEC 2011-R15 - 2011 QH50 - see above
Grabbed MPEC 2011-R16 - 2011 RF - see above
1505Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 PU1 risk assessment - see above
Noted that NEODyS has updated its 2011 PU1 risk assessment - see above
Noted that JPL Sentry has updated its 2011 QD48 risk assessment - see above
Noted that NEODyS has updated its 2011 QD48 risk assessment - see above
Noted that JPL Sentry has updated its 2011 QF48 risk assessment - see above
Noted that NEODyS has updated its 2011 QF48 risk assessment - see above
Grabbed MPEC 2011-R14 - Daily Orbit Update - see above
0415Grabbed MPEC 2011-R13 - 2011 QY39 - see above