Contents  on 13 August '13

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 13 August '13

No objects reported inside ten LD

No objects are reported passing inside ten lunar distances (LD) of Earth today, and none are known to be coming within that distance until mid-November.

This report was generated at 1434 UTC with follow-up in today's DOU MPEC for departed objects intruder 2013 PJ10 and radar target 277475 2005 WK4.

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 13 August '13

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 51 listings on the NEOCP today.

New MPECs  on 13 August '13

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 2013-P71 - "20:50 UT" - 2013 PW31

MPEC 2013-P70 - "20:46 UT" - 2013 PU31

MPEC 2013-P69 - "16:25 UT" - 2001 QE96

<< DOU on 13 Aug. '13 >>  MPEC 2013-P68 - "06:05 UT" - Daily Orbit Update

Observers  on 13 August '13

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2013-P68 & 2013-P70 -- 2013 PW6, 2013 PV13, 2013 PU31, 2013 PU13, 2013 PJ10, 2013 PH10, 2013 OU3, 2013 OM9, 2013 OG, 2013 NP11, 2013 NK, 2013 NH10, 2013 BO76, 2006 XJ1, 243147, 140039, 11405
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-P68 -- 2013 PJ26
Z81Estrella de Mar Obs., 3 in MPEC 2013-P68 -- 2013 PJ10, 361071, 24445
203GiaGa Obs. in Italy, 2 in MPEC 2013-P68 -- 2013 PJ10, 4581
J95Great Shefford Obs. in England, 1 in MPEC 2013-P68 -- 2013 PJ26
J93Mt. Tuffley Obs. in England, 1 in MPEC 2013-P68 -- 361071
I41Palomar Transient Factory (PTF) in southern California, 3 in MPEC 2013-P68 -- 2013 OO5, 2011 BD40, 276786
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2013-P68, 2013-P69 & 2013-P70 -- 2013 PU31, 2013 PJ26, 2013 PF21, 2013 PD26, 2009 WE253, 2001 QE96, 52762, 20790, 18736, 16960
Y00SONEAR Obs. in Brazil, 6 in MPEC 2013-P68 -- 2013 PX6, 2013 OM9, 2013 NX23, 2013 KR1, 277475, 11405
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-P70 -- 2013 PU31
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-P70 -- 2013 PU31
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-P71 -- 2013 PW31
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2013-P68, 2013-P69, 2013-P70 & 2013-P71 -- 2013 PW31, 2013 PV13, 2013 PU31, 2001 QE96
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-P70 -- 2013 PU31
G56Walnut Creek Obs. in northern California, 2 in MPEC 2013-P68 -- 308043, 277830
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 August '13

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
2013 PW31JPL Sentry23152051-2106153.5e-08-6.88-7.290JPL: "Analysis based on 11 observations spanning 1.0864 days (2013-Aug-12.26598 to 2013-Aug-13.35236)." Diameter approximately 0.061 km. from mean, weighted H=23.7.

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 13 August '13

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

2315Noted that JPL Sentry has posted 2013 PW31 as an impact risk - see above
2108Grabbed MPEC 2013-P70 - 2013 PU31 - see above
Grabbed MPEC 2013-P71 - 2013 PW31 - see above
1656Grabbed MPEC 2013-P69 - 2001 QE96 - see above
1434Generated Traffic Report
1431Grabbed MPEC 2013-P68 - Daily Orbit Update - see above