Contents  on 22 August '12

Asteroid/Comet Connection (A/CC) 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.

Traffic Report  on 22 August '12

One object reported inside ten LD

One asteroid is reported to be inside ten lunar distances (LD) of our planet today. 2012 PZ17 is outbound from 7.75 to 8.48 LD. No other objects are known to come within ten LD until November.

This report was generated at 2038 UTC to note the recovery of distant risk-listed 2011 AH5 (MPEC). Today's first traffic report was generated at 1507 UTC.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 22 August '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, nine 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 22 August '12

Minor Planet Electronic Circulars

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

MPEC 2012-Q36 - "20:43 UT" - 2012 PG6

MPEC 2012-Q35 - "18:40 UT" - 2011 AH5

MPEC 2012-Q34 - "18:38 UT" - 2007 LV8

MPEC 2012-Q33 - "18:30 UT" - 2012 QQ10

MPEC 2012-Q32 - "17:43 UT" - 2012 QP10

<< DOU on 22 Aug. '12 >>  MPEC 2012-Q31 - "06:03 UT" - Daily Orbit Update

Observers  on 22 August '12

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-Q32 -- 2012 QP10
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2012-Q31, 2012-Q32, 2012-Q34 & 2012-Q36 -- 2012 QP10, 2012 QJ2, 2012 PX, 2012 PP28, 2012 PN28, 2012 PN, 2012 PK24, 2012 PG6, 2012 PB20, 2012 OB1, 2012 MU2, 2012 FJ, 2012 DH4, 2007 LV8
300Bisei Spaceguard Center in Japan, 7 in MPECs 2012-Q31 & 2012-Q32 -- 2012 QP10, 2012 PX, 2012 PP28, 2012 PP24, 2012 PP17, 2012 PG5, 2009 AV
470Ceccano Obs. in Italy, 1 in MPEC 2012-Q32 -- 2012 QP10
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-Q31 & 2012-Q32 -- 2012 QV2, 2012 QP10, 2012 QC8
822Cordoba Obs. in Argentina, 2 in MPECs 2012-Q31 & 2012-Q32 -- 2012 QP10, 2001 YM2
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2012-Q31 -- 2012 PX, 2012 PC20
I16IAA-AI Atacama in Chile, 1 in MPEC 2012-Q33 -- 2012 QQ10
130Lumezzane Obs. in Italy, 11 in MPEC 2012-Q31 -- 2012 PG6, 2012 PG5, 2012 LE11, 2010 OS22, 2006 DY, 52387, 52381, 333578, 333358, 333284, 214869
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-Q35 -- 2011 AH5
711McDonald Obs. in Texas, 1 in MPEC 2012-Q31 -- 2012 QH8
474Mt. John Obs. in New Zealand, 2 in MPECs 2012-Q32 & 2012-Q36 -- 2012 QP10, 2012 PG6
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-Q36 -- 2012 PG6
A24New Millennium Obs. in Italy, 8 in MPEC 2012-Q31 -- 2010 OS22, 2009 AV, 333358, 217013, 105140, 8035, 4947, 4487
716Palmer Divide Obs. in Colorado, 1 in MPEC 2012-Q31 -- 68950
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2012-Q31 -- 2012 PP24, 2012 PK24, 1994 NK, 87311, 5011
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPECs 2012-Q31 & 2012-Q36 -- 2012 PG6, 2009 AV
B38Santa Mama Obs. in Italy, 7 in MPEC 2012-Q31 -- 2012 PG6, 2012 LU7, 2012 HG31, 2010 OS22, 2009 AV, 217013, 105140
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2012-Q31 & 2012-Q32 -- 2012 QP10, 2012 PS4, 2012 PQ28
A78Stia Obs. in Italy, 3 in MPEC 2012-Q31 -- 2012 PG5, 2012 MK6, 2100
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-Q32 -- 2012 QP10
194Tivoli Obs. in Namibia, 1 in MPEC 2012-Q32 -- 2012 QP10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 August '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 and NEODyS at 2302 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 CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 PN28JPL Sentry1505R E M O V E DJPL: Risk listing removed at 0850 UTC.
2012 PK24JPL Sentry15052037-2076213.7e-05-3.72-4.070JPL: "Analysis based on 26 observations spanning 8.0833 days (2012-Aug-13.41356 to 2012-Aug-21.49683)." Diameter approximately 0.063 km. from mean, weighted H=23.6.
NEODyS15052043-2094171.23e-05-4.16-4.270NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2012-08-13.414 to 2012-08-21.498."
2012 PB20JPL Sentry15052063-2111443.0e-06-5.90-6.660JPL: "Analysis based on 20 observations spanning 6.8846 days (2012-Aug-14.48152 to 2012-Aug-21.366087)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS15052090-210051.06e-06-6.35-6.780NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-21.367."
2012 PXJPL Sentry15052067-210865.7e-06-4.65-4.800JPL: "Analysis based on 70 observations spanning 14.581 days (2012-Aug-07.35157 to 2012-Aug-21.93253)." Diameter approximately 0.079 km. from mean, weighted H=23.1.
NEODyS15052067-209663.56e-06-4.82-5.080NEODyS: "Based on 71 optical observations (of which 2 are rejected as outliers) from 2012-08-07.352 to 2012-08-21.945."
2011 AH5JPL Sentry2117R E M O V E DJPL: Risk listing removed at 2055 UTC.

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 22 August '12

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

2117Noted that JPL Sentry has removed 2011 AH5 as an impact risk - see above
Grabbed MPEC 2012-Q36 - 2012 PG6 - see above
2038Generated Traffic Report
1901Grabbed MPEC 2012-Q33 - 2012 QQ10 - see above
Grabbed MPEC 2012-Q34 - 2007 LV8 - see above
Grabbed MPEC 2012-Q35 - 2011 AH5 - see above
1816Grabbed MPEC 2012-Q32 - 2012 QP10 - see above
1505Noted that JPL Sentry has updated its 2012 PB20 risk assessment - see above
Noted that NEODyS has updated its 2012 PB20 risk assessment - see above
Noted that JPL Sentry has updated its 2012 PK24 risk assessment - see above
Noted that NEODyS has updated its 2012 PK24 risk assessment - see above
Noted that JPL Sentry has removed 2012 PN28 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 PX risk assessment - see above
Noted that NEODyS has updated its 2012 PX risk assessment - see above
Grabbed MPEC 2012-Q31 - Daily Orbit Update - see above