Contents  on 23 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 23 August '13

No objects reported inside ten LD

There are no asteroids reported passing within ten lunar distances (LD) of Earth today. There is, however, an odd tiny object announced late yesterday, 2013 QW1 (MPEC), that appears to be orbiting the Earth-Moon system just beyond one lunar distance. This may be an artificial object but, if not, we will need to modify A/CC's programming to handle reporting a second moon. JPL has calculated one preliminary low-risk impact solution for 2015.

On approach next, radar target 2013 QR1 arrives inside ten LD on August 25th.

This report was generated at 1442 UTC with follow-up in today's DOU MPEC for 2013 QR1 and departed 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.

Radar Astrometry  on 23 August '13

Radar observation of one object

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

Data update noted at 2359 UTC when the database was dated 23 Aug.

NEOCP Activity  on 23 August '13

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. So far The Tracking News has counted a total of seventeen listings on the NEOCP today.

New MPECs  on 23 August '13

Minor Planet Electronic Circulars

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

MPEC 2013-Q27 - "23:26 UT" - Comet C/2012 S1 (ISON)

MPEC 2013-Q26 - "16:11 UT" - 2012 LK2

<< DOU on 23 Aug. '13 >>  MPEC 2013-Q25 - "06:01 UT" - Daily Orbit Update

Observers  on 23 August '13

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2013-Q27 -- C/2012 S1
251Arecibo in Puerto Rico, 1 in radar -- 2013 QR1
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2013-Q25 -- 2013 QR1, 66008, 369454, 359592, 271480, 105140, 4581
B75Betelgeuse Station in Italy, 1 in MPEC 2013-Q25 -- 2013 QR1
470Ceccano Obs. in Italy, 1 in MPEC 2013-Q25 -- 2013 QR1
006Fabra Obs. in Spain, 6 in MPEC 2013-Q25 -- 52762, 243147, 21088, 153349, 11405, 9950
203GiaGa Obs. in Italy, 3 in MPEC 2013-Q25 -- 2013 QR1, 2013 OM9, 308043
V37LCOGT Fort Davis in Texas, 1 in MPEC 2013-Q25 -- 2013 QR1
130Lumezzane Obs. in Italy, 4 in MPEC 2013-Q25 -- 294739, 280136, 243147, 140039
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2013-Q25 -- 369452
C10Maisoncelles Obs. in France, 1 in MPEC 2013-Q27 -- C/2012 S1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-Q26 -- 2012 LK2
A13Naef Obs. in Switzerland, 2 in MPEC 2013-Q25 -- 2013 QR1, 2009 WH106
G34Oberfrauendorf Obs., 2 in MPEC 2013-Q25 -- 2013 QR1, 361071
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-Q27 -- C/2012 S1
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2013-Q25 -- 2013 QR1
Y00SONEAR Obs. in Brazil, 10 in MPEC 2013-Q25 -- 53435, 39565, 329437, 277475, 250614, 243147, 144332, 140039, 11405, 2063
J84South Obs. in England, 1 in MPEC 2013-Q25 -- 2013 QR1
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-Q25 -- 2010 AF30
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 QW1JPL Sentry0049201514.7e-06-5.38-5.380JPL: "Analysis based on 15 observations spanning 4.3985 days (2013-Aug-18.5166 to 2013-Aug-22.91507)." Diameter approximately 0.011 km. from mean, weighted H=27.4.

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 23 August '13

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

2359Grabbed MPEC 2013-Q27 - Comet C/2012 S1 (Ison) - see above
Noted Radar Astrometry database update - see above
1616Grabbed MPEC 2013-Q26 - 2012 LK2 - see above
1442Generated Traffic Report
1441Grabbed MPEC 2013-Q25 - Daily Orbit Update - see above
0049Noted that JPL Sentry has posted 2013 QW1 as an impact risk - see above