Contents  on 15 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 15 September '13

Three objects reported inside ten LD

Risk-listed 2013 RS43 exits Earth's Hill sphere today, flying from 3.38 to 4.23 LD.

Update #2: Newly announced 2013 RM73 enters Earth's Hill sphere, moving from 5.04 to 3.22 LD today.

Update #1: We missed yesterday that the discovery of a tiny approaching intruder had been announced. There is also follow-up in today's DOU for 2013 RZ53, which is calculated to be on the order of two meters wide, which would be spectacular as a lawn ornament but is pretty tiny as minor objects go, if that is what it is. Knowledgable opinion on the Minor Planet Mailing List (MPML) is that, because of its orbit and low relative velocity to Earth, it is either artificial or ejecta from the Moon. Such a small object poses little risk but it does have impact solutions around the end of this century. Presently it is inside Earth's Hill sphere, inbound from 1.60 to 1.28 LD, and will be inside the Earth-Moon system from tomorrow until the 20th. Big thanks to reader "Sandy" who brought this overlooked object to our attention. (Who knew that anyone is reading these reports?!)

This report was updated at 2346 UTC with new discovery 2013 RM73 (MPEC). Today's first update at 1813 UTC was to include 2013 RZ53. Today's first traffic report was generated at 1614 UTC with follow-up in today's DOU MPEC for 2013 RS43 and for departed objects risk-listed 2013 QM48 and 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. 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 15 September '13

Radar observation of four objects

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


Data update noted at 0200 UTC when the database was dated 14 Sept.


Data update noted at 0449 UTC when the database was dated 14 Sept.


Data update noted at 2325 UTC when the database was dated 15 Sept.

NEOCP Activity  on 15 September '13

The MPC's NEO Confirmation Page has 37 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 37 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 43 listings on the NEOCP today.

New MPECs  on 15 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-R99 - "21:53 UT" - 2013 RM73


MPEC 2013-R98 - "11:32 UT" - 2000 GC147


<< DOU on 15 Sept. '13 >>  MPEC 2013-R97 - "06:06 UT" - Daily Orbit Update

Observers  on 15 September '13

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 3 in radar -- 2007 CN26, 2003 DZ15, 232691
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2013-R97 & 2013-R99 -- 2013 RZ53, 2013 RY5, 2013 RV9, 2013 RU9, 2013 RS9, 2013 RM73, 2013 RL21, 2013 RK21, 2013 RK16, 2013 RD6, 2013 QM10, 2013 QJ36, 2013 QJ10, 2013 QH11, 2013 QD11, 2013 PN43, 2013 NK, 2013 JK22, 163373
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2013-R97 & 2013-R99 -- 2013 RM73, 2013 PX6, 2013 PV6, 2013 KR1, 2011 SD173, 2004 SB1, 2004 GD28, 2003 OB4, 2002 RH52, 30825, 275677, 10115, 4183, 3691, 2100
I48El Catalejo Obs. in Argentina, 1 in MPEC 2013-R99 -- 2013 RM73
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-R99 -- 2013 RM73
253Goldstone DSS-14 70m antenna in southern California, 3 in radar -- 2007 CN26, 232691, 137126
J95Great Shefford Obs. in England, 2 in MPECs 2013-R97 & 2013-R99 -- 2013 RS43, 2013 RM73
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2013-R98 -- 2000 GC147
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2013-R99 -- 2013 RM73
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-R97 -- 2013 QM48
932McCarthy Obs. in Connecticut, 1 in MPEC 2013-R99 -- 2013 RM73
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-R97 & 2013-R98 -- 2013 RN43, 2013 PV6, 2011 BN24, 2010 SL13, 2000 GC147, 20826
N27Omsk-Yogik Obs., 1 in MPEC 2013-R97 -- 361071
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2013-R97 -- 2013 RB6, 2013 PU13, 350988, 326946
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2013-R97 & 2013-R98 -- 2013 RM43, 2013 KR1, 2007 FE1, 2000 GC147, 332408, 20236, 163249, 152756, 5797, 1943
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-R97 -- 2013 PX6, 2013 PV6, 2013 HG20, 2011 WU95, 2007 CN26
Y00SONEAR Obs. in Brazil, 9 in MPEC 2013-R97 -- 2011 QD48, 39565, 368664, 333478, 277475, 143649, 138095, 137126, 4953
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-R99 -- 2013 RM73
587Sormano Obs. in Italy, 1 in MPEC 2013-R99 -- 2013 RM73
J84South Obs. in England, 1 in MPEC 2013-R97 -- 2013 PX6
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2013-R97 -- 1999 SK10, 1998 QB28, 96315, 42286
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2013-R97 & 2013-R98 -- 2013 RU5, 2013 RN9, 2013 RK43, 2013 RE6, 2013 RC30, 2013 RB21, 2013 QY1, 2013 QN48, 2013 QN17, 2013 QM10, 2013 QL10, 2013 QH48, 2013 QC11, 2013 PZ38, 2013 PA7, 2013 GT38, 2000 GC147
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-R99 -- 2013 RM73
673!Jana Pittichova via Table Mtn. Obs. in southern California, 1 in MPEC 2013-R99 -- 2013 RM73
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2013 RZ53JPL Sentry16022097-2103151.8e-04-7.12-7.700JPL: "Analysis based on 17 observations spanning .92530 days (2013-Sep-13.37086 to 2013-Sep-14.296156)." Diameter approximately 0.002 km. from mean, weighted H=31.0.
NEODyS16022102-211161.31e-06-9.27-9.360NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2013-09-13.372 to 2013-09-14.297."
2013 RS43JPL Sentry16022084-2112111.5e-05-6.22-6.830JPL: "Analysis based on 36 observations spanning 5.7288 days (2013-Sep-09.38097 to 2013-Sep-15.109813)." Diameter approximately 0.013 km. from mean, weighted H=27.0.
NEODyS16022091-2112191.44e-05-6.24-6.910NEODyS: "Based on 36 optical observations (of which 2 are rejected as outliers) from 2013-09-09.382 to 2013-09-15.111."
2013 QM48JPL Sentry16022071-2113313.6e-05-5.98-6.700JPL: "Analysis based on 17 observations spanning 12.914 days (2013-Aug-30.46095 to 2013-Sep-12.374542)." Diameter approximately 0.011 km. from mean, weighted H=27.4.
NEODyS16022071-2112542.73e-05-6.11-6.650NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2013-08-30.462 to 2013-09-12.375."

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 15 September '13

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

2346Updated Traffic Report
2325Noted Radar Astrometry database update - see above
2206Grabbed MPEC 2013-R99 - 2013 RM73 - see above
1602Noted that JPL Sentry has updated its 2013 QM48 risk assessment - see above
Noted that NEODyS has updated its 2013 QM48 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 updated its 2013 RZ53 risk assessment - see above
Noted that NEODyS has posted 2013 RZ53 as an impact risk - see above
Grabbed MPEC 2013-R97 - Daily Orbit Update - see above
Grabbed MPEC 2013-R98 - 2000 GC147 - see above
0449Noted Radar Astrometry database update - see above
0200Noted Radar Astrometry database update - see above