Contents  on 20 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 20 August '13

No objects reported inside ten LD

There are no objects reported to be inside a radius of ten lunar distances (LD) from our home world today. Headed this way next, 2013 QR1 arrives inside ten LD on August 25th.

This report was generated at 1510 UTC with follow-up in today's DOU MPEC for 2013 QR1 and for departed objects 2013 PR43, 2013 PE21, and intruder 2013 PJ10.

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 20 August '13

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 24 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 20 August '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-Q21 - "21:07 UT" - 2013 PF67

MPEC 2013-Q20 - "17:00 UT" - 2013 ON5

<< DOU on 20 Aug. '13 >>  MPEC 2013-Q19 - "06:02 UT" - Daily Orbit Update

Observers  on 20 August '13

Twelve observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2013-Q19 -- 2013 PW6, 2013 PV6, 2013 PV13, 2013 PU13, 2013 PR43, 2013 PN43, 2013 PJ10, 2013 OO5, 2013 ON5, 2013 OG, 2013 NX23, 2013 NP11, 2013 ET9, 2013 BO76, 2006 UD63, 2006 EE1, 2003 OB4, 85804, 66008, 52762, 359592, 340666, 271480, 250620, 243147, 20826, 11405, 105140
160Castelmartini Obs. in Italy, 8 in MPEC 2013-Q19 -- 2013 OM9, 365071, 359592, 308043, 294739, 285263, 274855, 271480
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2013-Q19 & 2013-Q21 -- 2013 PR43, 2013 PO43, 2013 PF67, 2013 PE21, 2013 PA39, 2013 ON5, 2013 LF7, 2013 EV89
Z81Estrella de Mar Obs., 2 in MPEC 2013-Q19 -- 361071, 5143
I36Los Campitos Obs. in Argentina, 1 in MPEC 2013-Q19 -- 2013 KR1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-Q20 -- 2013 ON5
C23Olmen Obs. in Belgium, 1 in MPEC 2013-Q19 -- 137126
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2013-Q19 & 2013-Q21 -- 2013 QV1, 2013 PF67, 2013 PC7
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2013-Q19 -- 2013 QR1, 2013 PR43, 2013 OM9, 2013 BO76, 2010 TN54, 2010 CF19
J84South Obs. in England, 2 in MPEC 2013-Q19 -- 2013 QR1, 2013 PR43
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-Q20 -- 2013 ON5
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-Q19 -- 4015
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 QU1NEODyS15132038-2110255.66e-08-5.05-5.170NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2013-08-16.340 to 2013-08-18.947."
2012 BG96JPL Sentry14542083-209861.7e-09-6.12-6.790JPL: "Analysis based on 10 observations spanning 1.5467 days (2012-Jan-27.94191 to 2012-Jan-29.48863)." Diameter approximately 0.570 km. from mean, weighted H=18.9.

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 '13

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

2316Grabbed MPEC 2013-Q21 - 2013 PF67 - see above
1717Grabbed MPEC 2013-Q20 - 2013 ON5 - see above
1513Noted that NEODyS has posted 2013 QU1 as an impact risk - see above
1510Generated Traffic Report
1454Noted that JPL Sentry has posted 2012 BG96 as an impact risk - see above
Grabbed MPEC 2013-Q19 - Daily Orbit Update - see above