Contents  on 8 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 8 October '13

Six objects reported inside ten LD

There are six objects reported to be within a radius of ten lunar distances (LD) from our planet today. 2013 TO4 comes its closest to Earth this time around, reaching 6.27 LD at 2225 UT. Three objects are outbound: radar target 2013 SU24 moves from 6.18 to 7.01 LD, risk-listed intruder 2013 RZ53 from 6.48 to 6.80 LD, and 2013 SC21 from 8.96 to 9.80 LD. And the other two objects exit ten LD: 2013 TQ4 passes from 9.19 to 10.41 LD and 2013 TG6 from 9.30 to 10.18 LD.

Risk-listed 2013 TX68 is calculated with some uncertainty to arrive inside ten LD on October 10th and radar target 2001 AV43 comes inside on November 6th.

This report was generated at 1431 UTC with follow-up in today's DOU MPEC for 2013 SU24 and observation of distant 152664 1998 FW4.

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.

Radar Astrometry  on 8 October '13

Radar observation of three 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 2025 UTC when the database was dated 8 Oct.

Data update noted at 2150 UTC when the database was dated 8 Oct.

Data update noted at 2359 UTC when the database was dated 8 Oct.

NEOCP Activity  on 8 October '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, five were "one nighters." So far The Tracking News has counted a total of 25 listings on the NEOCP today.

New MPECs  on 8 October '13

Minor Planet Electronic Circulars

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

MPEC 2013-T76 - "21:00 UT" - Comet P/2013 T1 (Panstarrs)

MPEC 2013-T75 - "17:06 UT" - 2013 TH69

MPEC 2013-T74 - "17:01 UT" - 2013 TL69

MPEC 2013-T73 - "16:56 UT" - 2013 TK69

MPEC 2013-T72 - "16:52 UT" - 2013 TJ69

MPEC 2013-T71 - "16:46 UT" - 2013 TG69

MPEC 2013-T70 - "13:51 UT" - 2003 JC17

<< DOU on 8 Oct. '13 >>  MPEC 2013-T69 - "06:04 UT" - Daily Orbit Update

MPEC 2013-T68 - "04:17 UT" - 2002 QZ6

Observers  on 8 October '13

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2013-T69 -- 162273
251Arecibo in Puerto Rico, 2 in radar -- 2013 RH74, 363790
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2013-T72, 2013-T73, 2013-T74 & 2013-T76 -- 2013 TL69, 2013 TK69, 2013 TJ69, P/2013 T1
160Castelmartini Obs. in Italy, 12 in MPEC 2013-T69 -- 2013 PX6, 2005 EF, 368184, 340666, 326946, 275677, 271480, 269690, 250620, 243147, 152664, 6063
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2013-T69 & 2013-T75 -- 2013 TH69, 2013 SR24, 2013 PJ26, 2005 EF, 1999 SK10, 85774, 17511
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2013-T69 & 2013-T72 -- 2013 TK, 2013 TJ69, 2013 TH, 2013 TE4, 2013 SC20, 2013 PU31
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-T69 -- 2212
E105Richard Miles in England via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-T76 -- P/2013 T1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2013 SU24
J95Great Shefford Obs. in England, 1 in MPEC 2013-T74 -- 2013 TL69
H15ISON-NM Obs. in New Mexico, 3 in MPEC 2013-T69 -- 2008 HB38, 5143, 4450
V37LCOGT Fort Davis in Texas, 2 in MPECs 2013-T71 & 2013-T76 -- 2013 TG69, P/2013 T1
G38La Senda Obs., 1 in MPEC 2013-T69 -- 2013 SW24
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2013-T71, 2013-T73, 2013-T75 & 2013-T76 -- 2013 TK69, 2013 TH69, 2013 TG69, P/2013 T1
474Mt. John Obs. in New Zealand, 1 in MPEC 2013-T69 -- 2013 TN4
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2013-T69, 2013-T74, 2013-T75 & 2013-T76 -- 2013 TL69, 2013 TH69, 2013 TE6, P/2013 T1, 2013 SR24, 2008 TQ2, 293726, 275545, 162510, 154302, 153951
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2013-T69 -- 17511, 4450
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2013-T69, 2013-T71, 2013-T72, 2013-T73 & 2013-T76 -- 2013 TK69, 2013 TJ69, 2013 TG69, P/2013 T1, 2013 RC30
Y00SONEAR Obs. in Brazil, 1 in MPEC 2013-T69 -- 351545
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-T71, 2013-T72 & 2013-T75 -- 2013 TJ69, 2013 TH69, 2013 TG69
K90Sopot Obs., 3 in MPEC 2013-T69 -- 2013 SU24, 2013 RH74, 2013 OM9
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2013-T69, 2013-T71, 2013-T73, 2013-T74 & 2013-T76 -- 2013 TM4, 2013 TL69, 2013 TK69, 2013 TG69, P/2013 T1, 2013 RK43, 2013 RJ43, 2013 RH43, 2013 NP11, 2009 XD, 2005 UN157
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2013-T71, 2013-T74 & 2013-T75 -- 2013 TL69, 2013 TH69, 2013 TG69
926Tenagra II Obs. in Arizona, 7 in MPECs 2013-T68, 2013-T69, 2013-T70, 2013-T71, 2013-T72, 2013-T73 & 2013-T74 -- 2013 TL69, 2013 TK69, 2013 TJ69, 2013 TG69, 2003 JC17, 2002 QZ6, 17511
I42Westport Obs. in Massachusetts, 2 in MPEC 2013-T69 -- 2013 QJ10, 2012 TS
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-T76 -- P/2013 T1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 TX68NEODyS14272016-210491.14e-07-5.67-5.680NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2013-10-06.261 to 2013-10-07.330."
2013 SW24NEODyS14272106-210611.49e-08-6.08-6.080NEODyS: "Based on 138 optical observations (of which 0 are rejected as outliers) from 2013-09-27.557 to 2013-10-07.197."
29075 1950 DAJPL Sentry2150288014.4e-04-0.58-0.58-JPL: "Analysis based on 8 radar delay, 5 Doppler, and 454 optical observations spanning 22899.0 days (1950-Feb-22.230140 to 2012-Nov-02.272872)." Diameter approximately 1.300 km. from mean, weighted H=17.6.

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 8 October '13

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

2359Noted Radar Astrometry database update - see above
2256Grabbed MPEC 2013-T76 - Comet P/2013 T1 (Panstarrs) - see above
2150Noted that JPL Sentry has posted 29075 1950 DA as an impact risk - see above
Noted Radar Astrometry database update - see above
2025Noted Radar Astrometry database update - see above
1717Grabbed MPEC 2013-T71 - 2013 TG69 - see above
Grabbed MPEC 2013-T72 - 2013 TJ69 - see above
Grabbed MPEC 2013-T73 - 2013 TK69 - see above
Grabbed MPEC 2013-T74 - 2013 TL69 - see above
Grabbed MPEC 2013-T75 - 2013 TH69 - see above
1431Generated Traffic Report
1427Noted that NEODyS has reposted 2013 SW24 as an impact risk - see above
Noted that NEODyS has posted 2013 TX68 as an impact risk - see above
Grabbed MPEC 2013-T68 - 2002 QZ6 - see above
Grabbed MPEC 2013-T69 - Daily Orbit Update - see above
Grabbed MPEC 2013-T70 - 2003 JC17 - see above