Contents  on 17 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 17 August '13

One object reported inside ten LD

One visitor is reported to be inside a radius of ten lunar distances (LD) from our planet today. 2013 PR43 leaves the ten LD "bubble," moving from 9.77 to 11.26 LD. No other objects are known to be coming this close until mid-November.

This report was generated at 1429 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 17 August '13

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 66 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 17 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-Q10 - "18:33 UT" - 2013 PJ44

MPEC 2013-Q09 - "18:29 UT" - 2013 PH44

MPEC 2013-Q08 - "16:35 UT" - Comet 96P/Machholz B

<< DOU on 17 Aug. '13 >>  MPEC 2013-Q07 - "06:04 UT" - Daily Orbit Update

Observers  on 17 August '13

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2013-Q07, 2013-Q09 & 2013-Q10 -- 2013 PX6, 2013 PW14, 2013 PV13, 2013 PU13, 2013 PJ44, 2013 PH44, 2013 PC7, 2013 OO5
I74Baxter Garden Obs. in England, 1 in MPEC 2013-Q07 -- 2013 PW6
160Castelmartini Obs. in Italy, 3 in MPEC 2013-Q07 -- 365071, 274855, 219071
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2013-Q07 -- 2013 NX, 2013 NT11, 2008 VN
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-Q07 -- 2009 WH106
Z81Estrella de Mar Obs., 2 in MPEC 2013-Q07 -- 308043, 105140
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2013-Q09 -- 2013 PH44
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2013-Q07 -- 2013 PV6, 2013 BF27, 2013 BF18
C47Nonndorf Obs. in Austria, 1 in MPEC 2013-Q07 -- 2013 PX6
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2013-Q07 -- 2013 PX6, 2013 NX23, 2006 QA58, 276786, 5143
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2013-Q07, 2013-Q09 & 2013-Q10 -- 2013 PJ44, 2013 PJ26, 2013 PH44, 2013 PE26, 2013 NK, 2013 NH10, 2009 WH106, 2009 SU19, 2009 DM1, 52762, 280136, 16960
C63Piazzi Obs., 1 in MPEC 2013-Q07 -- 2010 TN54
C95SATINO-1 in France, 1 in MPEC 2013-Q07 -- 2009 WH106
233San Vito Obs. in Italy, 1 in MPEC 2013-Q07 -- 140039
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-Q07 -- 2010 EF21
249Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2013-Q08 -- 96Pb
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-Q07 -- 2011 XO3
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2013-Q09 & 2013-Q10 -- 2013 PJ44, 2013 PH44
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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
2009 SBJPL Sentry2359211115.7e-10-7.02-7.020JPL: "Analysis based on 55 observations spanning 55.844 days (2009-Sep-16.24433 to 2009-Nov-11.0882)." Diameter approximately 0.260 km. from mean, weighted H=20.6.

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 17 August '13

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

2359Noted that JPL Sentry has posted 2009 SB as an impact risk - see above
1901Grabbed MPEC 2013-Q09 - 2013 PH44 - see above
Grabbed MPEC 2013-Q10 - 2013 PJ44 - see above
1753Grabbed MPEC 2013-Q08 - Comet 96P/Machholz B - see above
1429Grabbed MPEC 2013-Q07 - Daily Orbit Update - see above
Generated Traffic Report