Contents  on 5 October '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 5 October '13

Five objects reported inside ten LD

Five visitors are reported to be within ten lunar distances (LD) of Earth today. Radar target 2013 SU24 comes its closest to Earth on this passage, reaching 5.13 LD at 1044 UT. Risk-listed intruder 2013 RZ53 is outbound from 5.52 to 5.84 LD and 2013 TQ4 from 6.06 to 6.98 LD. And two objects enter the ten-LD reporting "bubble": 2013 TO4 comes in from 10.46 to 8.85 LD and 2013 SC21 from 10.77 to 9.50 LD.

Returning radar target 2001 AV43 arrives inside ten LD on November 6th.

This report was updated at 1644 UTC to note that today's DOU MPEC includes observation of 2001 AV43 from July and that this object's recovery and follow-up were reported in DOUs from September 10th, 13th, and 26th. Today's first traffic report was generated at 1436 UTC with follow-up in the DOU for 2013 TD, 2013 SU24, and 2013 SC21, plus observation of distant 2012 UV136 and 2006 VV2.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. "Distant" is used to describe objects that have come within ten LD since this reporting began (2007) but are not so close during this passage or apparition. 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 5 October '13

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 61 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 5 October '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-T38 - "17:08 UT" - 2013 TH5

<< DOU on 5 Oct. '13 >>  MPEC 2013-T37 - "06:03 UT" - Daily Orbit Update

Observers  on 5 October '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2013-T37 & 2013-T38 -- 2013 TH5, 2013 SW24, 2013 SU24, 2013 RX80, 2013 RH74, 2008 HB38, 2005 EF, 355256, 294739, 242216, 223456
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2013-T37 -- 2013 ST19, 2013 SC21
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-T37 -- 2013 SN20
448Desert Moon Obs. in New Mexico, 1 in MPEC 2013-T37 -- 2013 QJ10
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-T37 -- 2013 TE
113Drebach Obs. in Germany, 1 in MPEC 2013-T38 -- 2013 TH5
246KLENOT in the Czech Republic, 1 in MPEC 2013-T37 -- 2013 SR24
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-T37 -- 2001 AV43
118Modra Obs. in Slovakia, 1 in MPEC 2013-T38 -- 2013 TH5
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-T37 & 2013-T38 -- 2013 TH5, 2013 RH74, 2013 PJ26, 2012 UV136, 293726, 264308, 242216
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2013-T37 -- 2013 TF, 2013 RJ74, 2013 HG20, 2006 VV2, 65733, 373135, 4183
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-T38 -- 2013 TH5
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-T38 -- 2013 TH5
204Schiaparelli Obs. in Italy, 16 in MPEC 2013-T37 -- 2013 SF, 2013 RX80, 2013 RX73, 2013 RW73, 2013 RV9, 2013 RG74, 2013 PN43, 2012 TS, 2012 MO3, 2009 YO, 2008 SQ1, 2008 HB38, 2007 UB66, 2005 SH26, 2003 WX25, 2001 QC34
033Schwarzschild Obs. in Germany, 11 in MPECs 2013-T37 & 2013-T38 -- 2013 TL, 2013 TJ4, 2013 TH5, 2013 TH4, 2013 TG4, 2013 TF, 2013 TD4, 2013 TD, 2013 SX24, 2013 SG25, 2013 SF25
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2013-T37 -- 2009 FU4, 2008 TA1, 2000 HW23, 30825, 252793
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2013-T37 -- 2013 TG4, 2013 SW24, 2013 SE21, 2013 RZ73, 2013 RH74, 2013 RE, 2013 RC32, 2013 MY5, 2010 RA147, 2009 QD34
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 October '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 TP4NEODyS14352026-202612.14e-05-4.84-4.840NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2013-10-03.230 to 2013-10-04.180."
2013 TG4JPL Sentry1435R E M O V E DJPL: Risk listing removed at 1201 UTC.
2013 SW24NEODyS14352026-202614.59e-10-6.75-6.750NEODyS: "Based on 119 optical observations (of which 0 are rejected as outliers) from 2013-09-27.557 to 2013-10-04.209."
2013 RC32NEODyS1435R E M O V E D-
JPL Sentry1435R E M O V E DJPL: Risk listing removed at 1201 UTC.

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 5 October '13

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

1801Grabbed MPEC 2013-T38 - 2013 TH5 - see above
1644Updated Traffic Report
1435Noted that JPL Sentry has removed 2013 RC32 as an impact risk - see above
Noted that NEODyS has removed 2013 RC32 as an impact risk - see above
Noted that NEODyS has updated its 2013 SW24 risk assessment - see above
Noted that JPL Sentry has removed 2013 TG4 as an impact risk - see above
Noted that NEODyS has posted 2013 TP4 as an impact risk - see above
Grabbed MPEC 2013-T37 - Daily Orbit Update - see above