Contents  on 14 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 14 September '13

One object reported inside ten LD

One asteroid is reported passing inside ten lunar distances (LD) of Earth today. Risk-listed 2013 RS43 is traveling from 2.91 to 3.38 LD within Earth's Hill sphere.

This report was generated at 1544 (corrected at 1654) UTC with pre-discovery observations in today's DOU MPEC for 2013 RS43 and departed risk-listed 2013 RR43, as well as follow-up for departed 2013 PR43 and astrometry for 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. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 14 September '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 14 Sept.

NEOCP Activity  on 14 September '13

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 39 listings on the NEOCP today.

New MPECs  on 14 September '13

Minor Planet Electronic Circulars

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

MPEC 2013-R96 - "11:34 UT" - 2013 RZ53

<< DOU on 14 Sept. '13 >>  MPEC 2013-R95 - "06:06 UT" - Daily Orbit Update

Observers  on 14 September '13

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 52760
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2013-R95 -- 2013 RT43, 2013 RC30, 2013 QH11, 2006 UC63, 264308, 249816
U82CS3 Palmer Divide Station in southern California, 2 in MPEC 2013-R95 -- 329437, 152664
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2013-R95 -- 2013 QN11, 2012 ER14, 2006 KD1, 20826, 142464, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2013-R95 -- 2013 RW5, 2013 RM21, 2013 RF36, 2013 QN48, 2013 PF67
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 52760
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-R95 -- 5143
C91Montevenere Obs., 1 in MPEC 2013-R95 -- 2009 WE253
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-R95 & 2013-R96 -- 2013 RZ53, 2013 PR43, 66008, 354182, 329437, 163250, 3361
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-R95 -- 2009 SK1
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2013-R95 -- 2013 RS43, 2013 RR43, 2013 RH43
Y00SONEAR Obs. in Brazil, 5 in MPEC 2013-R95 -- 2013 HG20, 2005 EF, 1996 TP6, 52760, 4953
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-R95 -- 2013 RE21
291Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2013-R95 -- 2013 RX9, 2013 RU5, 2013 RS5, 2013 RN9, 2013 RH36, 2013 RH21, 2013 RE6, 2013 RD32, 2013 RB21, 2013 QY1, 2013 QV1, 2013 QL10, 2013 QH48, 2013 QC11, 2013 NP11, 2013 NL10
I76Tesla Obs. in Spain, 2 in MPEC 2013-R95 -- 2013 PX6, 2010 TN54
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-R96 -- 2013 RZ53
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 RZ53JPL Sentry15422059-2108304.2e-04-6.73-7.300JPL: "Analysis based on 13 observations spanning .89125 days (2013-Sep-13.37086 to 2013-Sep-14.26211)." Diameter approximately 0.002 km. from mean, weighted H=30.9.
2013 RS43JPL Sentry15422073-2112211.1e-05-6.33-6.880JPL: "Analysis based on 33 observations spanning 4.1213 days (2013-Sep-09.38097 to 2013-Sep-13.50229)." Diameter approximately 0.013 km. from mean, weighted H=27.0.
NEODyS15422084-2112191.11e-05-6.34-6.660NEODyS: "Based on 33 optical observations (of which 1 are rejected as outliers) from 2013-09-09.382 to 2013-09-13.503."
2013 RR43JPL Sentry15422046-205731.3e-07-6.78-6.860JPL: "Analysis based on 20 observations spanning 3.8170 days (2013-Sep-09.46134 to 2013-Sep-13.278336)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
NEODyS15422050-205721.72e-07-6.65-6.720NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2013-09-09.462 to 2013-09-13.279."

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 14 September '13

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

2359Noted Radar Astrometry database update - see above
1544Generated Traffic Report
1542Noted that JPL Sentry has updated its 2013 RR43 risk assessment - see above
Noted that NEODyS has updated its 2013 RR43 risk assessment - see above
Noted that JPL Sentry has updated its 2013 RS43 risk assessment - see above
Noted that NEODyS has updated its 2013 RS43 risk assessment - see above
Noted that JPL Sentry has posted 2013 RZ53 as an impact risk - see above
Grabbed MPEC 2013-R95 - Daily Orbit Update - see above
Grabbed MPEC 2013-R96 - 2013 RZ53 - see above