Contents  on 19 October '12

Asteroid/Comet Connection (A/CC) Resources:

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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 19 October '12

Eight objects reported inside ten LD

There are eight asteroids reported to be flying within ten lunar distances (LD) of our home world today. Inside Earth's Hill sphere, risk-listed 2012 UE comes its closest to Earth on this passage, reaching 2.02 LD at 0805 UTC, and also its closest to the Moon -- 2.91 LD at 1000 UTC. Further out, 2012 TQ146 is outbound from 5.19 to 6.99 LD, 2012 TE79 from 6.31 to 7.48 LD, 2012 UF from 7.00 to 7.63 LD, 2012 TD79 from 7.19 to 7.92 LD, and intruder 2012 TC4 (risk-listed radar target) departs from inside ten LD, passing from 10.00 to 11.47 LD, while newly announced 2012 US18 is inbound from 7.92 to 5.75 LD and 2012 TP231 from 7.82 to 6.82 LD.

Coming to the neighborhood next, 2012 UW9 arrives inside ten LD on October 27th and radar target 2010 JK1 on November 22nd.

This report was generated at 1558 UTC with new discovery 2012 US18 (MPEC) and follow-up in today's DOU MPEC for 2012 TP231 and departed 2012 UU9 and 2012 UT9.

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 19 October '12

The MPC's NEO Confirmation Page has 56 listings

When last checked at 2314 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 56 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 88 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 19 October '12

Minor Planet Electronic Circulars

As of last check at 2314 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-U48 - "17:11 UT" - 2012 UP27

MPEC 2012-U47 - "13:29 UT" - 2012 UT18

MPEC 2012-U46 - "13:26 UT" - 2012 US18

MPEC 2012-U45 - "13:21 UT" - 2012 UR18

MPEC 2012-U44 - "13:16 UT" - 2012 UQ18

<< DOU on 19 Oct. '12 >>  MPEC 2012-U43 - "06:07 UT" - Daily Orbit Update

Observers  on 19 October '12

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-U43 -- 2012 SW20
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2012-U43 -- 2012 TK123, 2010 HQ80, 334412, 326732, 276397, 219071, 162911
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPECs 2012-U43, 2012-U44, 2012-U45 & 2012-U48 -- 2012 UR18, 2012 UQ18, 2012 UP27, 2012 TX78, 2012 TT231, 2012 TS231, 2012 TQ139, 2012 TD53, 2012 SD22, 2012 SB22, 2012 RF15, 2012 QF42, 2012 LK11, 2006 DY, 2002 RV112, 162004
G58Chabot Obs. in northern California, 1 in MPEC 2012-U43 -- 85770
821Cordoba Obs. Bosque Alegre Station in Argentina, 1 in MPEC 2012-U44 -- 2012 UQ18
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-U43 -- 2012 UV9
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-U43 -- 2012 RV16
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-U43 -- 2012 TF79
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 4 in MPEC 2012-U43 -- 2012 TP139, 2012 SD22, 2012 RS16, 333358
B15Inastars Obs. in Germany, 1 in MPEC 2012-U43 -- 2007 UQ13
G89Kachina Obs. in Arizona, 1 in MPEC 2012-U43 -- 2004 TL19
704LINEAR in New Mexico, 5 in MPEC 2012-U43 -- 2012 TG53, 2012 RX16, 2012 JS11, 136993, 4587
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2012-U43 -- 5646
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2012-U44, 2012-U45, 2012-U46 & 2012-U47 -- 2012 UT18, 2012 US18, 2012 UR18, 2012 UQ18
5682David Tholen's team on Mauna Kea in Hawaii, 6 in MPECs 2012-U43 & 2012-U44 -- 2012 UQ18, 2012 TZ79, 2012 TV78, 2012 TU, 2012 TM20, 2012 SW20
711McDonald Obs. in Texas, 1 in MPEC 2012-U43 -- 2012 TF79
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2012-U45, 2012-U46, 2012-U47 & 2012-U48 -- 2012 UT18, 2012 US18, 2012 UR18, 2012 UP27
A13Naef Obs. in Switzerland, 1 in MPEC 2012-U43 -- 2012 JS11
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2012-U43 & 2012-U44 -- 2012 UQ18, 2012 TS231, 2012 TD53, 2012 SV20, 2009 TG10, 2009 SQ104, 2008 XE2, 2008 SX7, 312942, 17182, 162900, 2212
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-U43 -- 2012 TG53, 2012 QF49, 2012 OO, 2012 LE11, 2012 JS11, 2005 JU1, 2002 UA31, 2002 TY68
071Rhozen Obs. in Bulgaria, 3 in MPEC 2012-U43 -- 87684, 163899, 3753
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2012-U43 -- 2012 UV9, 2012 UU9, 2012 UT9, 2012 TP231, 2012 TB259, 2012 TA259
I42Westport Obs. in Massachusetts, 1 in MPEC 2012-U43 -- 2002 UA31
718Wiggins Obs. in Utah, 2 in MPEC 2012-U43 -- 2012 TZ52, 2012 TG53
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 October '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2315 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 UY9NEODyS14532022-2092494.38e-06-5.04-5.640NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2012-10-17.272 to 2012-10-18.257."
2012 TS78NEODyS14532026-2098133.42e-08-3.60-3.640NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2012-10-08.201 to 2012-10-17.378."

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 19 October '12

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

1803Grabbed MPEC 2012-U48 - 2012 UP27 - see above
1558Generated Traffic Report
1453Noted that NEODyS has reposted 2012 TS78 as an impact risk - see above
Noted that NEODyS has posted 2012 UY9 as an impact risk - see above
Grabbed MPEC 2012-U43 - Daily Orbit Update - see above
Grabbed MPEC 2012-U44 - 2012 UQ18 - see above
Grabbed MPEC 2012-U45 - 2012 UR18 - see above
Grabbed MPEC 2012-U46 - 2012 US18 - see above
Grabbed MPEC 2012-U47 - 2012 UT18 - see above