Contents  on 9 October '12

Asteroid/Comet Connection (A/CC) Resources:

  Note: The A/CC news pages will update only occasionally through early October 12th UTC.

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 9 October '12

Two objects reported inside ten LD

Two asteroids are reported to be within ten lunar distances (LD) of our planet today. Intruder 2012 TC4 (a risk-listed radar target) enters Earth's Hill sphere, traveling from 4.80 to 3.33 LD. Further away, risk-listed intruder 2012 TV is outboud from 5.20 to 8.94 LD.

Coming to the neighborhood next, 2010 JK1 arrives inside ten LD on November 22nd.

This report was generated at 2138 UTC with newly discovered and just departed 2012 TP20 (MPEC) and follow-up in today's DOU MPEC for 2012 TC4 and 2012 TV.

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 9 October '12

The MPC's NEO Confirmation Page has 174 listings

When last checked at 2147 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 174 objects listed. Of these, 146 were "one nighters."

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 9 October '12

Minor Planet Electronic Circulars

As of last check at 2147 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-T33 - "15:47 UT" - Comet P/2012 SB6 (Lemmon)

MPEC 2012-T32 - "15:15 UT" - 2012 TR20

MPEC 2012-T31 - "15:13 UT" - 2012 TQ20

MPEC 2012-T30 - "15:10 UT" - 2012 TP20

MPEC 2012-T29 - "15:08 UT" - 2012 TO20

MPEC 2012-T28 - "15:05 UT" - 2012 TN20

MPEC 2012-T27 - "15:03 UT" - 2012 TM20

MPEC 2012-T26 - "15:00 UT" - 2012 TL20

<< DOU on 9 Oct. '12 >>  MPEC 2012-T25 - "06:03 UT" - Daily Orbit Update

Observers  on 9 October '12

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2012-T25 -- 2012 TC4, 2012 RV16, 2012 JS11
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2012-T25, 2012-T26, 2012-T27, 2012-T28, 2012-T29, 2012-T30, 2012-T31 & 2012-T32 -- 2012 TR20, 2012 TQ20, 2012 TP20, 2012 TO20, 2012 TN20, 2012 TM20, 2012 TL20, 2012 SY20, 2012 SB22, 2012 SA59, 2012 QF49, 2012 QF42, 2012 QE50, 2012 OO, 2012 OA1, 2012 JR17, 2012 FD23, 2009 TC8
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-T25 -- 2012 TC4
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2012-T25, 2012-T32 & 2012-T33 -- 2012 TR20, 2012 SZ49, P/2012 SB6, 2007 HZ, 334412, 326732, 192642, 162900, 10302, 6047
1212Vasilij G. Shevchenko via Chuguevskaya Station in the Ukraine, 1 in MPEC 2012-T25 -- 214869
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-T25 -- 2012 RV16
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2012-T25 -- 2012 TV, 2012 TS5, 2009 TK
J95Great Shefford Obs. in England, 1 in MPEC 2012-T26 -- 2012 TL20
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-T32 -- 2012 TR20
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-T25 -- 17182
C32Ka-Dar Obs. TAU Station in Russia, 1 in MPEC 2012-T25 -- 2012 TC4
704LINEAR in New Mexico, 1 in MPEC 2012-T33 -- P/2012 SB6
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2012-T26, 2012-T27, 2012-T28, 2012-T29, 2012-T30, 2012-T31 & 2012-T32 -- 2012 TR20, 2012 TQ20, 2012 TP20, 2012 TO20, 2012 TN20, 2012 TM20, 2012 TL20
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-T33 -- P/2012 SB6
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-T25, 2012-T30, 2012-T31 & 2012-T33 -- 2012 TQ20, 2012 TP20, P/2012 SB6, 2003 FT3, 333889
583Odessa-Mayaki Obs. in the Ukraine, 2 in MPEC 2012-T25 -- 214869, 4179
716Palmer Divide Obs. in Colorado, 1 in MPEC 2012-T25 -- 330825
F51Pan-STARRS 1 (PS1) in Hawaii, 17 in MPECs 2012-T25, 2012-T26, 2012-T27, 2012-T28, 2012-T29 & 2012-T33 -- 2012 TO20, 2012 TN20, 2012 TM20, 2012 TL20, P/2012 SB6, 2012 RQ16, 2012 LE11, 2009 SQ104, 2009 KT21, 2004 XN14, 2000 CR101, 232368, 178871, 163694, 138815, 106589, 5626
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2012-T25 -- 2012 RV16, 2012 QE50
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-T33 -- P/2012 SB6
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-T25 -- 303262
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-T32 -- 2012 TR20
H36Sandlot Obs. in Kansas, 4 in MPECs 2012-T26, 2012-T27, 2012-T28 & 2012-T29 -- 2012 TO20, 2012 TN20, 2012 TM20, 2012 TL20 Canary Islands Obs. in the Canary Islands, 1 in MPEC 2012-T25 -- 144411
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2012-T25 & 2012-T33 -- P/2012 SB6, 2009 TB3, 2005 VT5, 3288
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2012-T27, 2012-T28 & 2012-T29 -- 2012 TO20, 2012 TN20, 2012 TM20
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-T25 -- 2012 QE50
954Teide Obs. in the Canary Islands, 2 in MPEC 2012-T25 -- 5731, 3360
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-T25 -- 192642
I76Tesla Obs. in Spain, 2 in MPEC 2012-T25 -- 2012 JS11, 2002 UA31
G56Walnut Creek Obs. in northern California, 1 in MPEC 2012-T25 -- 276397
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 October '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2148 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
2012 TP20JPL Sentry18512089-210633.2e-08-9.24-9.480JPL: "Analysis based on 14 observations spanning 1.0725 days (2012-Oct-08.19843 to 2012-Oct-09.270918)." Diameter approximately 0.009 km. from mean, weighted H=27.9.
2012 TC4JPL Sentry18512030-210232.4e-07-7.07-7.070JPL: "Analysis based on 29 observations spanning 4.4282 days (2012-Oct-04.467673 to 2012-Oct-08.89591)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS18512021-2083101.35e-06-6.35-6.980NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2012-10-08.897."
2012 TVJPL Sentry18512070-210781.4e-06-5.91-6.350JPL: "Analysis based on 189 observations spanning 1.8162 days (2012-Oct-05.32361 to 2012-Oct-07.139772)." Diameter approximately 0.031 km. from mean, weighted H=25.2.

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 9 October '12

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

2138Generated Traffic Report
1851Noted that JPL Sentry has posted 2012 TC4 as an impact risk - see above
Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that JPL Sentry has posted 2012 TP20 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 TV risk assessment - see above
Grabbed MPEC 2012-T25 - Daily Orbit Update - see above
1850Grabbed MPEC 2012-T26 - 2012 TL20 - see above
Grabbed MPEC 2012-T27 - 2012 TM20 - see above
Grabbed MPEC 2012-T28 - 2012 TN20 - see above
Grabbed MPEC 2012-T29 - 2012 TO20 - see above
Grabbed MPEC 2012-T30 - 2012 TP20 - see above
Grabbed MPEC 2012-T31 - 2012 TQ20 - see above
Grabbed MPEC 2012-T32 - 2012 TR20 - see above
Grabbed MPEC 2012-T33 - Comet P/2012 SB6 (Lemmon) - see above