Contents  on 1 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 1 October '13

Three objects reported inside ten LD

Three objects are reported to be inside ten lunar distances (LD) of Earth today. Tiny risk-listed intruder 2013 RZ53, possibly artificial, is outbound from 4.24 to 4.56 LD and 2013 SK20 from 5.53 to 7.91 LD, while 2013 SU24 is inbound from 7.93 to 6.94 LD.

Headed our way next, 2013 SC21 arrives inside ten LD on October 5th.

This report was generated at 1500 UTC with astrometry in today's DOU MPEC for 2013 SU24 (first follow-up) and 2013 SC21.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 1 October '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 2241 UTC when the database was dated 1 Oct.

NEOCP Activity  on 1 October '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 28 listings on the NEOCP today.

New MPECs  on 1 October '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-T03 - "18:47 UT" - 2013 SX24

MPEC 2013-T02 - "18:16 UT" - 1999 SG10

<< DOU on 1 Oct. '13 >>  MPEC 2013-T01 - "06:04 UT" - Daily Orbit Update

Observers  on 1 October '13

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-T02 -- 1999 SG10
251Arecibo in Puerto Rico, 1 in radar -- 363305
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2013-T01, 2013-T02 & 2013-T03 -- 2013 SX24, 2013 SX19, 2013 RW73, 2013 RV9, 2013 RS9, 1999 SG10
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2013-T01 -- 2013 SK19
160Castelmartini Obs. in Italy, 1 in MPEC 2013-T01 -- 237805
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2013-T01, 2013-T02 & 2013-T03 -- 2013 SX24, 2003 WX25, 1999 SG10, 1996 TP6, 358744, 350988
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2013-T01 -- 2013 ST19, 2013 ST, 2013 SL19, 2013 SD21, 2013 SC21, 2013 PV2
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-T01 -- 2013 SO24, 2013 RM43, 2013 RJ43, 2009 DM1, 271480, 162510
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 5 in MPECs 2013-T01 & 2013-T02 -- 2013 SO19, 2013 RH74, 2012 TS, 2001 QC34, 1999 SG10
113Drebach Obs. in Germany, 1 in MPEC 2013-T03 -- 2013 SX24
A27Eridanus Obs. in Germany, 2 in MPEC 2013-T01 -- 2013 RX80, 2013 RH74
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 363305
H15ISON-NM Obs. in New Mexico, 2 in MPEC 2013-T01 -- 5143, 4450
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2013-T01 -- 2010 CD55
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2013-T02 -- 1999 SG10
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2013-T01 -- 2012 UW136
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2013-T01 & 2013-T03 -- 2013 SX24, 2013 SV24, 2013 SU24, 2013 SL20, 2013 RM43, 2013 RK16, 96315, 190788, 168378, 152756
C23Olmen Obs. in Belgium, 1 in MPEC 2013-T01 -- 2012 TS
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2013-T01 -- 2100
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2013-T01 -- 2005 RQ6, 1580
I41Palomar Transient Factory (PTF) in southern California, 3 in MPEC 2013-T01 -- 2013 SS19, 2003 RM, 5143
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-T01 -- 2013 PY6
Y00SONEAR Obs. in Brazil, 2 in MPEC 2013-T01 -- 333478, 1627
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-T02 & 2013-T03 -- 2013 SX24, 1999 SG10
033Schwarzschild Obs. in Germany, 10 in MPEC 2013-T01 -- 2013 SV24, 2013 SV19, 2013 SU24, 2013 SO20, 2013 SN20, 2013 SL20, 2013 SL19, 2013 SD21, 2013 SB21, 2000 UW13
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2013-T01 -- 2013 RZ73, 2013 RU9, 2013 RL21, 2013 RJ74, 2013 RH43, 2013 RD21, 2013 QJ48, 2013 PO43, 326946, 162873
926Tenagra II Obs. in Arizona, 4 in MPEC 2013-T01 -- 2013 ST, 2013 SO24, 2013 SN24, 2013 SN20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 SW24NEODyS14562032-203216.06e-07-3.77-3.770NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2013-09-27.557 to 2013-09-30.750."

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 1 October '13

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

2241Grabbed MPEC 2013-T02 - 1999 SG10 - see above
Grabbed MPEC 2013-T03 - 2013 SX24 - see above
Noted Radar Astrometry database update - see above
1500Generated Traffic Report
1456Noted that NEODyS has posted 2013 SW24 as an impact risk - see above
Grabbed MPEC 2013-T01 - Daily Orbit Update - see above