Contents  on 13 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 13 September '13

One object reported inside ten LD

There is one visitor reported inside a radius of ten lunar distances (LD) from our planet today. Inside Earth's Hill sphere, newly announced risk-listed 2013 RS43 comes its closest to Earth on this passage, reaching 2.88 LD at 1606 UT.

This report was generated at 1617 UTC with new discoveries 2013 RS43 (MPEC) and departed risk-listed 2013 RR43 (MPEC).



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.

NEOCP Activity  on 13 September '13

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of 23 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 13 September '13

Minor Planet Electronic Circulars

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


MPEC 2013-R94 - "13:02 UT" - 2013 RT43


MPEC 2013-R93 - "12:57 UT" - 2013 RS43


MPEC 2013-R92 - "12:51 UT" - 2013 RR43


MPEC 2013-R91 - "12:43 UT" - 2013 RQ43


MPEC 2013-R90 - "12:32 UT" - 2013 RN43


MPEC 2013-R89 - "12:28 UT" - 2013 RM43


MPEC 2013-R88 - "12:23 UT" - 2013 RL43


MPEC 2013-R87 - "12:18 UT" - 2013 RK43


MPEC 2013-R86 - "12:12 UT" - 2013 RJ43


MPEC 2013-R85 - "12:07 UT" - 2013 RH43


MPEC 2013-R84 - "11:51 UT" - 2013 PK67


<< DOU on 13 Sept. '13 >>  MPEC 2013-R83 - "06:06 UT" - Daily Orbit Update

Observers  on 13 September '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2013-R85, 2013-R86, 2013-R87, 2013-R88, 2013-R90, 2013-R91 & 2013-R92 -- 2013 RR43, 2013 RQ43, 2013 RN43, 2013 RL43, 2013 RK43, 2013 RJ43, 2013 RH43
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-R83 -- 2013 QJ10
U82CS3 Palmer Divide Station in southern California, 4 in MPEC 2013-R83 -- 2013 QJ10, 350988, 168378, 152664
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2013-R83, 2013-R93 & 2013-R94 -- 2013 RY5, 2013 RT43, 2013 RS43, 2013 RC32, 2013 RB30, 2013 QN11, 2010 UX95, 2008 GE1, 85709, 303262, 162980, 159699, 137126, 8013, 5863, 5653, 3352
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2013-R83, 2013-R85, 2013-R86, 2013-R87, 2013-R88, 2013-R89, 2013-R90 & 2013-R92 -- 2013 RR43, 2013 RN43, 2013 RM43, 2013 RL43, 2013 RK43, 2013 RJ43, 2013 RH43, 2013 RF36, 2013 LW28, 2013 KF6, 2000 SV20
G32Elena Remote Obs., 1 in MPEC 2013-R83 -- 168378
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-R83 -- 2013 HG20
W85LCOGT Cerro Tololo A in Chile, 4 in MPECs 2013-R83, 2013-R87, 2013-R88 & 2013-R89 -- 2013 RM43, 2013 RL43, 2013 RK43, 2001 AV43
K93LCOGT Sutherland C in South Africa, 4 in MPECs 2013-R90, 2013-R91, 2013-R92 & 2013-R94 -- 2013 RT43, 2013 RR43, 2013 RQ43, 2013 RN43
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2013-R85, 2013-R86, 2013-R87 & 2013-R88 -- 2013 RL43, 2013 RK43, 2013 RJ43, 2013 RH43
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2013-R83, 2013-R84, 2013-R90, 2013-R91 & 2013-R92 -- 2013 RX9, 2013 RR43, 2013 RQ43, 2013 RN43, 2013 RH21, 2013 PK67, 2010 CE55, 2010 CC180, 276468, 221787, 162581, 2201
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-R83 -- 355256
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2013-R85, 2013-R86, 2013-R87, 2013-R88 & 2013-R89 -- 2013 RM43, 2013 RL43, 2013 RK43, 2013 RJ43, 2013 RH43
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2013-R83 -- 2013 PX6, 2013 PV6, 2007 CN26
Y00SONEAR Obs. in Brazil, 3 in MPEC 2013-R83 -- 275677, 269690, 4953
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-R85, 2013-R88 & 2013-R89 -- 2013 RM43, 2013 RL43, 2013 RH43
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2013-R83, 2013-R84, 2013-R85 & 2013-R87 -- 2013 RN9, 2013 RK43, 2013 RH43, 2013 RC30, 2013 PK67, 2013 PF26, 2013 NP8, 2013 GY7, 2002 XP37
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 RS43JPL Sentry16162073-2112271.3e-05-6.17-6.530JPL: "Analysis based on 31 observations spanning 1.1829 days (2013-Sep-12.31937 to 2013-Sep-13.50229)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS14562073-2112221.37e-05-6.16-6.490NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2013-09-12.320 to 2013-09-13.503."
2013 RR43JPL Sentry16162036-205746.4e-07-6.02-6.110JPL: "Analysis based on 17 observations spanning .98179 days (2013-Sep-12.29655 to 2013-Sep-13.278336)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
NEODyS14562036-205946.7e-07-6.01-6.120NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2013-09-12.297 to 2013-09-13.279."
2013 RC32JPL Sentry1456208711.3e-06-4.73-4.730JPL: "Analysis based on 54 observations spanning 6.9799 days (2013-Sep-05.42596 to 2013-Sep-12.40582)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
2008 EM68JPL Sentry04122014-21105624.6e-06-5.77-6.280JPL: "Analysis based on 11 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.5.

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 13 September '13

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

1617Generated Traffic Report
1616Noted that JPL Sentry has posted 2013 RR43 as an impact risk - see above
Noted that JPL Sentry has posted 2013 RS43 as an impact risk - see above
1456Noted that JPL Sentry has updated its 2013 RC32 risk assessment - see above
Noted that NEODyS has posted 2013 RR43 as an impact risk - see above
Noted that NEODyS has posted 2013 RS43 as an impact risk - see above
Grabbed MPEC 2013-R83 - Daily Orbit Update - see above
Grabbed MPEC 2013-R84 - 2013 PK67 - see above
Grabbed MPEC 2013-R85 - 2013 RH43 - see above
Grabbed MPEC 2013-R86 - 2013 RJ43 - see above
Grabbed MPEC 2013-R87 - 2013 RK43 - see above
Grabbed MPEC 2013-R88 - 2013 RL43 - see above
Grabbed MPEC 2013-R89 - 2013 RM43 - see above
Grabbed MPEC 2013-R90 - 2013 RN43 - see above
Grabbed MPEC 2013-R91 - 2013 RQ43 - see above
Grabbed MPEC 2013-R92 - 2013 RR43 - see above
Grabbed MPEC 2013-R93 - 2013 RS43 - see above
Grabbed MPEC 2013-R94 - 2013 RT43 - see above
0412Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above