Contents  on 20 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 20 August '12

Two objects reported inside ten LD

There are two asteroids reported flying within ten lunar distances (LD) of Earth today. 2012 PZ17 is outbound from 6.33 to 7.03 LD and 2012 PD20 departs from inside ten LD, traveling from 9.98 to 10.41 LD. No other objects are known to come this close until November.

This report was generated at 1525 UTC with follow-up in today's DOU MPEC for 2012 PD20 and 2012 PZ17.

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 20 August '12

Radar observation of six 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 2015 UTC when the database was dated 20 Aug.

Data update noted at 2236 UTC when the database was dated 20 Aug.

Data update noted at 2359 UTC when the database was dated 20 Aug.

NEOCP Activity  on 20 August '12

The MPC's NEO Confirmation Page has 12 listings

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

New MPECs  on 20 August '12

Minor Planet Electronic Circulars

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

MPEC 2012-Q27 - "17:25 UT" - 2010 LT108

MPEC 2012-Q26 - "12:35 UT" - 2012 QD8

MPEC 2012-Q25 - "10:44 UT" - 2012 QC8

<< DOU on 20 Aug. '12 >>  MPEC 2012-Q24 - "06:02 UT" - Daily Orbit Update

Observers  on 20 August '12

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2012-Q24 -- 2004 SB56, 52387
251Arecibo in Puerto Rico, 6 in radar -- 2012 NN, 2012 MM11, 2012 KM45, 2004 FG11, 2001 CQ36, 333707
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2012-Q24, 2012-Q26 & 2012-Q27 -- 2012 QD8, 2012 PP28, 2012 PO28, 2010 LT108
I74Baxter Garden Obs., 1 in MPEC 2012-Q24 -- 2009 AV
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2012-Q24 -- 2012 PW
160Castelmartini Obs. in Italy, 23 in MPEC 2012-Q24 -- 2012 PS17, 2012 PP24, 2012 PG5, 2012 OP4, 2012 OO, 2012 LU7, 2012 LE11, 2009 AV, 2000 RN77, 1998 QC1, 333707, 333578, 333358, 333284, 331963, 330825, 329340, 326732, 277475, 219071, 217013, 214869, 144411
470Ceccano Obs. in Italy, 1 in MPEC 2012-Q25 -- 2012 QC8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2012-Q24 & 2012-Q25 -- 2012 QC8, 2012 PZ17, 2012 PQ28, 2012 PP28, 2012 PK24, 2012 PD20, 2012 PC20, 2012 JR17
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-Q24 -- 277475
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-Q25 -- 2012 QC8
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-Q26 -- 2012 QD8
J95Great Shefford Obs. in England, 1 in MPEC 2012-Q25 -- 2012 QC8
C43Hoyerswerda Obs. in Germany, 2 in MPEC 2012-Q24 -- 2012 PW, 2012 PG6
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-Q24 -- 2012 PC20, 2009 AV
J93Mt. Tuffley Obs. in England, 3 in MPEC 2012-Q24 -- 276397, 4769, 4179
A13Naef Obs. in Switzerland, 3 in MPEC 2012-Q24 -- 2006 OT9, 9202, 5143
716Palmer Divide Obs. in Colorado, 6 in MPEC 2012-Q24 -- 88710, 69230, 65803, 185851, 5587, 1862
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-Q26 -- 2012 QD8
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q26 -- 2012 QD8
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-Q25 -- 2012 QC8
954Teide Obs. in the Canary Islands, 2 in MPECs 2012-Q24 & 2012-Q25 -- 2012 QC8, 2012 PG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 QD8JPL Sentry16022020-21112034.5e-06-4.16-4.950JPL: "Analysis based on 18 observations spanning 2.8907 days (2012-Aug-17.44424 to 2012-Aug-20.33494)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
NEODyS15202032-2094921.27e-05-3.61-3.740NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2012-08-17.445 to 2012-08-20.336."
2012 QC8JPL Sentry1520210938.2e-09-4.73-4.870JPL: "Analysis based on 33 observations spanning 30.638 days (2012-Jul-20.55237 to 2012-Aug-20.19029)." Diameter approximately 0.890 km. from mean, weighted H=17.9.
2012 PK24JPL Sentry15202032-2079463.9e-05-3.66-3.930JPL: "Analysis based on 19 observations spanning 5.8227 days (2012-Aug-13.41356 to 2012-Aug-19.23628)." Diameter approximately 0.066 km. from mean, weighted H=23.5.
NEODyS15202032-2094301.79e-05-4.00-4.310NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2012-08-13.414 to 2012-08-19.237."

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 20 August '12

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

2359Noted Radar Astrometry database update - see above
2236Noted Radar Astrometry database update - see above
2015Noted Radar Astrometry database update - see above
1750Grabbed MPEC 2012-Q27 - 2010 LT108 - see above
1602Noted that JPL Sentry has posted 2012 QD8 as an impact risk - see above
1525Generated Traffic Report
1520Noted 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 posted 2012 QC8 as an impact risk - see above
Noted that NEODyS has posted 2012 QD8 as an impact risk - see above
Grabbed MPEC 2012-Q24 - Daily Orbit Update - see above
Grabbed MPEC 2012-Q25 - 2012 QC8 - see above
Grabbed MPEC 2012-Q26 - 2012 QD8 - see above