Contents  on 11 September '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 11 September '13

One object reported inside ten LD

There is one visitor reported inside ten lunar distances (LD) of our home world today. 2013 QE16 departs from our ten-LD reporting "bubble," traveling from 9.90 to 10.49 LD. No objects are currently known to be coming inside until mid-November.

This report was generated at 1616 UTC with follow-up in today's DOU MPEC for risk-listed departed 2013 QM48 plus observation of distant radar target 152664 1998 FW4.

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 11 September '13

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. So far The Tracking News has counted a total of 20 listings on the NEOCP today.

New MPECs  on 11 September '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-R81 - "16:34 UT" - 2010 XK52

MPEC 2013-R80 - "13:58 UT" - 2013 RE6

<< DOU on 11 Sept. '13 >>  MPEC 2013-R79 - "06:04 UT" - Daily Orbit Update

Observers  on 11 September '13

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2013-R79 -- 2013 RK21, 2013 RK16, 2013 RE6, 2013 RE21, 2013 QN11, 2013 QM10, 2013 QJ36
160Castelmartini Obs. in Italy, 7 in MPEC 2013-R79 -- 2013 PX6, 2013 PN43, 2013 OM9, 2013 MX5, 2013 BO76, 2010 TN54, 2009 CP5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-R79 -- 2013 PY6
G32Elena Remote Obs., 1 in MPEC 2013-R79 -- 168378
Z81Estrella de Mar Obs., 2 in MPEC 2013-R79 -- 2013 QJ10, 88710
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2013-R79 -- 2010 JF87
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2013-R79 & 2013-R81 -- 2013 QM48, 2010 XK52, 2010 AK2
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-R80 -- 2013 RE6
A24New Millennium Obs. in Italy, 1 in MPEC 2013-R79 -- 361071
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-R79 -- 2013 RB6
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-R79 -- 2012 XR134
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2013-R79 -- 2013 QJ10, 2013 PN43, 2013 OM9, 2013 MX5, 2013 HG20, 2010 TN54, 2001 QC34, 250620
Y00SONEAR Obs. in Brazil, 24 in MPEC 2013-R79 -- 2013 PX6, 2011 QD48, 2010 UX95, 2009 SK1, 2009 DM1, 2002 RH52, 65733, 54789, 52762, 368664, 365071, 350988, 271480, 269690, 250620, 243147, 242450, 159699, 152664, 143678, 137126, 11405, 8013, 4953
H36Sandlot Obs. in Kansas, 2 in MPEC 2013-R79 -- 2013 RU9, 2013 RG21
G56Walnut Creek Obs. in northern California, 1 in MPEC 2013-R79 -- 2013 QJ10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 September '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 QM48JPL Sentry16142071-2113355.2e-05-5.85-6.560JPL: "Analysis based on 14 observations spanning 10.924 days (2013-Aug-30.46095 to 2013-Sep-10.384542)." Diameter approximately 0.011 km. from mean, weighted H=27.5.
NEODyS16142071-2112432.16e-05-6.23-7.030NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2013-08-30.462 to 2013-09-10.385."
2001 AV43NEODyS1614R E M O V E D-

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 11 September '13

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

1704Grabbed MPEC 2013-R81 - 2010 XK52 - see above
1616Generated Traffic Report
1614Noted that NEODyS has removed 2001 AV43 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 QM48 risk assessment - see above
Noted that NEODyS has updated its 2013 QM48 risk assessment - see above
Grabbed MPEC 2013-R79 - Daily Orbit Update - see above
Grabbed MPEC 2013-R80 - 2013 RE6 - see above