Contents  on 31 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 31 August '12

One object reported inside ten LD

There is one object reported flying inside ten lunar distances (LD) of Earth today. 2012 QZ16 is outbound from 7.20 to 8.45 LD.

Approaching our neighborhood next, radar target 2012 QG42 arrives inside ten LD on September 11th.

This report was generated at 1449 UTC with follow-up in today's DOU MPEC for 2012 QG42 and departed 2012 QB18.

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.

Radar Astrometry  on 31 August '12

Radar observation of four objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 1930 UTC when the database was dated 31 Aug.

Data update noted at 2227 UTC when the database was dated 31 Aug.

NEOCP Activity  on 31 August '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of twelve listings on the NEOCP today.

New MPECs  on 31 August '12

Minor Planet Electronic Circulars

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

MPEC 2012-Q83 - "13:52 UT" - 2012 QE50

<< DOU on 31 Aug. '12 >>  MPEC 2012-Q82 - "06:03 UT" - Daily Orbit Update

Observers  on 31 August '12

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

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-Q83 -- 2012 QE50
251Arecibo in Puerto Rico, 4 in radar -- 2011 UK21, 302831, 162421, 4581
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2012-Q82 & 2012-Q83 -- 2012 QF42, 2012 QE50, 2012 QB17, 2012 PX, 2012 PS17, 2012 OD1, 2012 BZ76, 2010 OS22, 2009 AV, 2002 RC118, 1998 QC1, 333358, 326732, 219071, 178871, 138847
160Castelmartini Obs. in Italy, 10 in MPECs 2012-Q82 & 2012-Q83 -- 2012 QP17, 2012 QE50, 2012 QB17, 2012 PS17, 2012 PP24, 2012 PG5, 2012 PC20, 1998 QC1, 330825, 214869
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-Q83 -- 2012 QE50
470Ceccano Obs. in Italy, 1 in MPEC 2012-Q83 -- 2012 QE50
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPEC 2012-Q82 -- 2012 QG42, 2012 QF42, 2012 QB18, 2012 PP28, 2012 PH6, 2012 OZ, 2012 HS15, 2012 HG31, 2012 DG61, 2011 OB, 2005 UL5, 2005 QQ30, 2001 SF262, 2001 OX13, 2000 SD8, 2000 FL1, 1999 OQ3
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-Q83 -- 2012 QE50
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-Q82 -- 2012 QG42
130Lumezzane Obs. in Italy, 1 in MPEC 2012-Q82 -- 2000 RH60
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-Q82 -- 2012 QK45, 2012 QG8
118Modra Obs. in Slovakia, 1 in MPEC 2012-Q83 -- 2012 QE50
A24New Millennium Obs. in Italy, 1 in MPEC 2012-Q83 -- 2012 QE50
C23Olmen Obs. in Belgium, 1 in MPEC 2012-Q83 -- 2012 QE50
J41Raheny Obs. in Ireland, 1 in MPEC 2012-Q83 -- 2012 QE50
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q83 -- 2012 QE50
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-Q82 -- 2012 QG42
510Siegen Obs. in Germany, 1 in MPEC 2012-Q83 -- 2012 QE50
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-Q83 -- 2012 QE50
954Teide Obs. in the Canary Islands, 2 in MPECs 2012-Q82 & 2012-Q83 -- 2012 QG42, 2012 QE50
718Wiggins Obs. in Utah, 2 in MPECs 2012-Q82 & 2012-Q83 -- 2012 QG42, 2012 QE50
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2012-Q82 -- 219071, 105140
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 August '12

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 CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 QB18JPL Sentry1447210815.4e-09-7.96-7.960JPL: "Analysis based on 31 observations spanning 4.7112 days (2012-Aug-25.4922 to 2012-Aug-30.20336)." Diameter approximately 0.057 km. from mean, weighted H=23.9.
2012 PXNEODyS14482100-210014.44e-08-6.82-6.820NEODyS: "Based on 170 optical observations (of which 3 are rejected as outliers) from 2012-08-07.352 to 2012-08-30.210."
JPL Sentry14472067-210831.7e-06-5.26-5.320JPL: "Analysis based on 169 observations spanning 22.858 days (2012-Aug-07.35157 to 2012-Aug-30.209183)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
2011 DX4JPL Sentry04482021-2111221.6e-07-7.44-7.660JPL: "Analysis based on 11 observations spanning .17442 days (2011-Feb-25.19028 to 2011-Feb-25.3647)." Diameter approximately 0.015 km. from mean, weighted H=26.7.

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 31 August '12

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

2227Noted Radar Astrometry database update - see above
1930Noted Radar Astrometry database update - see above
1449Generated Traffic Report
1447Noted that JPL Sentry has updated its 2012 PX risk assessment - see above
Noted that NEODyS has reposted 2012 PX as an impact risk - see above
Noted that JPL Sentry has updated its 2012 QB18 risk assessment - see above
Grabbed MPEC 2012-Q82 - Daily Orbit Update - see above
Grabbed MPEC 2012-Q83 - 2012 QE50 - see above
0448Noted that JPL Sentry has updated its 2011 DX4 risk assessment - see above