Contents  on 22 October '12

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 22 October '12

Five objects reported inside ten LD

Five objects are reported inside ten lunar distances (LD) of our planet today. Two are inside Earth's Hill sphere. 2012 US18 comes its closest to Earth this time around, reaching 1.62 LD at 1108 UTC, and also its closest to the Moon -- 1.63 LD at 1002 UTC. And 2012 UF34 comes its closest to our planet on this passage, reaching 2.80 LD at 1057 UTC.

More distantly, 2012 TP231 comes its closest to Earth on this apparition -- 5.78 LD at 0510 UTC, and two objects exit from within ten LD: risk-listed 2012 UE travels from 8.32 to 11.29 LD and 2012 UF from 9.48 to 10.59 LD.

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

This report was generated at 1637 UTC with today's DOU MPEC carrying follow-up for 2012 UF34 and the recovery of, and first follow-up for departed risk-listed 2012 TU231 (revised at 1718 UTC).


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 22 October '12

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 80 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 22 October '12

Minor Planet Electronic Circulars

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


MPEC 2012-U67 - "16:46 UT" - 2012 SF51 = 2010 JG123


MPEC 2012-U66 - "16:10 UT" - Comet C/2012 U1 (Panstarrs)


MPEC 2012-U65 - "10:04 UT" - 2012 SF51


<< DOU on 22 Oct. '12 >>  MPEC 2012-U64 - "06:09 UT" - Daily Orbit Update

Observers  on 22 October '12

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2012-U64 -- 2012 UW27, 2012 US9, 2012 UF34, 2012 UD, 2012 TQ139, 2012 TP274, 2012 TP139, 2012 TO231, 2012 TJ146, 2010 SV3, 2005 EJ225, 1994 UG, 221455
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2012-U64 & 2012-U65 -- 2012 SF51, 1999 TZ4, 67399, 303262, 6047, 4487
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPEC 2012-U64 -- 2012 UB34, 2012 TT231, 2012 TO231, 2012 QQ50, 2012 QP10, 2012 QO10, 2012 OZ, 2012 MN2, 2012 KJ18, 2010 XT45, 2010 TS149, 88959, 141447
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2012-U64 -- 2007 TR65, 2007 HZ
448Desert Moon Obs. in New Mexico, 6 in MPEC 2012-U64 -- 2012 TP139, 2012 TM139, 2012 TJ146, 303262, 277127, 6569
639Dresden Obs. in Germany, 1 in MPEC 2012-U64 -- 136993
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-U66 -- C/2012 U1
157Frasso Sabino Obs. in Italy, 4 in MPEC 2012-U64 -- 2012 TS231, 2012 TP139, 2012 QR50, 2005 SH19
D00ISON-Kislovodsk Obs., 1 in MPEC 2012-U64 -- 277127
246KLENOT in the Czech Republic, 2 in MPEC 2012-U64 -- 2012 TK123, 2012 TG53
046Klet Obs. in the Czech Republic, 12 in MPEC 2012-U64 -- 2012 UF34, 2012 TZ52, 2012 TG53, 2012 SA59, 2012 RX16, 2012 RV16, 2012 QO10, 2012 QB17, 2012 LE11, 2012 JS11, 2009 SB15, 2008 HV4
704LINEAR in New Mexico, 21 in MPEC 2012-U64 -- 2012 UX27, 2012 TK123, 2012 LU7, 2012 JS11, 2012 HO15, 2012 HG31, 2009 BD2, 2002 TR190, 2001 UF18, 1999 HA2, 88710, 334412, 326732, 214869, 159635, 154278, 112985, 10302, 7888, 6569, 5131
130Lumezzane Obs. in Italy, 5 in MPEC 2012-U64 -- 2012 TG53, 2012 RV16, 2010 OF101, 2005 ST1, 5836
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2012-U64, 2012-U65 & 2012-U66 -- C/2012 U1, 2012 TO20, 2012 SF51, 2012 HO15, 2008 SS251, 1996 XW1, 96536, 331990, 314082, 5751
A24New Millennium Obs. in Italy, 1 in MPEC 2012-U64 -- 2012 UF34
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2012-U64 & 2012-U66 -- 2012 UP27, C/2012 U1, 2012 TX78, 2012 QF49, 2012 JR17, 2009 WC26, 237442, 207970, 106589, 5731, 4587
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2012-U64 -- 2012 TY79, 2012 TG53, 2012 SQ56, 2012 SA59, 2012 QF49, 2012 QE50, 2012 LE11, 2012 JS11, 2012 HJ1, 2009 SB15, 2003 UC20
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-U66 -- C/2012 U1
H36Sandlot Obs. in Kansas, 6 in MPEC 2012-U64 -- 2012 UZ33, 2012 UF34, 2012 UD34, 2012 UC34, 2012 UA34, 2012 TS231
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2012-U64 & 2012-U67 -- 2012 SF51, 2012 QF49
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2012-U64, 2012-U65 & 2012-U66 -- 2012 UQ18, 2012 UK, 2012 UD34, 2012 UC34, C/2012 U1, 2012 TY52, 2012 TX284, 2012 TV78, 2012 TU231, 2012 TS78, 2012 TP139, 2012 TH146, 2012 TF53, 2012 SW49, 2012 SF51, 2007 TQ24
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-U64 -- 276397
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-U64 -- 2007 YX1
A92Urseanu Obs. in Romania, 1 in MPEC 2012-U64 -- 136993
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 October '12

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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2012 UZ33JPL Sentry19242015-2108271.5e-06-1.72-1.840JPL: "Analysis based on 30 observations spanning 3.9609 days (2012-Oct-17.44832 to 2012-Oct-21.40923)." Diameter approximately 0.606 km. from mean, weighted H=18.7.
NEODyS16342015-2099101.13e-06-1.77-1.850NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-10-17.449 to 2012-10-21.410."
2012 TU231JPL Sentry1634211112.6e-07-7.54-7.540JPL: "Analysis based on 28 observations spanning 6.2308 days (2012-Oct-15.19373 to 2012-Oct-21.42455)." Diameter approximately 0.019 km. from mean, weighted H=26.2.
2012 TS78JPL Sentry1634R E M O V E DJPL: Risk listing removed at 0951 UTC.
2012 SF51NEODyS1750R E M O V E DNEODyS #2 for the day

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 22 October '12

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

1924Noted that JPL Sentry has updated its 2012 UZ33 risk assessment - see above
1750Noted that NEODyS has removed 2012 SF51 as an impact risk - see above
1703Grabbed MPEC 2012-U67 - 2012 SF51 = 2010 JG123 - see above
1637Generated Traffic Report
1634Noted that NEODyS has posted 2012 SF51 as an impact risk - see above
Noted that JPL Sentry has removed 2012 TS78 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 TU231 risk assessment - see above
Noted that NEODyS has updated its 2012 UZ33 risk assessment - see above
Grabbed MPEC 2012-U64 - Daily Orbit Update - see above
Grabbed MPEC 2012-U65 - 2012 SF51 - see above
Grabbed MPEC 2012-U66 - Comet C/2012 U1 (Panstarrs) - see above