Contents  on 28 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 28 October '12

Three objects reported inside ten LD

There are three asteroids reported flying within ten lunar distances (LD) of Earth today. Risk-listed 2012 UU169 enters Earth's Hill sphere, coming from 4.85 to 3.24 LD. And 2012 UX136 is inbound from 9.8 to 8.7 LD* and 2012 UW9 from 9.7 to 9.4 LD*.

Coming toward Earth next, 2012 UV136 arrives inside ten LD on November 1st, risk-listed 2012 UY68 arrives on November 7th, and radar target 2010 JK1 on November 22nd.

This report was generated at 1623 UTC with follow-up in today's DOU MPEC for 2012 UU169 and 2012 UV136.

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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 28 October '12

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 27 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 28 October '12

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 2012-U117 - "20:47 UT" - 2012 UL171

MPEC 2012-U116 - "20:39 UT" - 2012 UK171

<< DOU on 28 Oct. '12 >>  MPEC 2012-U115 - "06:07 UT" - Daily Orbit Update

Observers  on 28 October '12

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2012-U115 -- 2012 UX27, 2012 US9, 2012 US136, 2012 UR158, 2012 UD, 2012 TZ52, 2012 TQ78, 2012 TQ139, 2012 TJ146, 2012 TA79, 2012 SQ56, 2012 QQ50, 2012 QO10, 2012 OO, 2012 JR17, 2002 TR190, 88710, 303262, 277127, 276397, 192563, 162082, 6047, 5836, 5587, 4947, 4487, 3908
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2012-U115 -- 2012 UX27, 2003 UC20, 33342, 237442, 19356, 6569
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-U115 -- 2012 UB34, 2012 QP17, 2007 HX4
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-U115 -- 2012 UV136
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2012-U115 -- 2012 UC69, 199145
C18Frasnes-Lez-Anvaing Obs. in Belgium, 2 in MPEC 2012-U115 -- 88263, 3360
J95Great Shefford Obs. in England, 2 in MPECs 2012-U115 & 2012-U116 -- 2012 UU169, 2012 UK171
704LINEAR in New Mexico, 9 in MPECs 2012-U115 & 2012-U116 -- 2012 UR158, 2012 UK171, 2012 SQ56, 2012 SA59, 2012 RV16, 68548, 330825, 162679, 136993
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-U115 -- 2012 GK
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-U115 & 2012-U117 -- 2012 UL171, 11054, 1685
A24New Millennium Obs. in Italy, 2 in MPEC 2012-U115 -- 2002 TY68, 153306
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2012-U115 -- 2012 TY79, 2012 TF79, 2006 WR127, 2004 CH52, 96744, 85770, 141079, 137199, 3200, 2212
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-U115 -- 2012 UC69, 2012 SA59, 2012 LE11, 2012 JS11, 2008 HV4, 2002 TY68, 214869, 3200
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-U115 -- 2012 UV136
510Siegen Obs. in Germany, 1 in MPEC 2012-U116 -- 2012 UK171
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-U115 -- 2012 QF49
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-U115 -- 5646
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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.





Notes for Today's Latest Risk Assessments
2012 UU169NEODyS16192100-210012.19e-08-8.20-8.20NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2012-10-25.204 to 2012-10-28.025."
2012 UU158NEODyS16192029-2097506.61e-05-4.94-5.180NEODyS: "Based on 7 optical observations (of which 1 are rejected as outliers) from 2012-10-23.506 to 2012-10-25.403."
2012 UR158JPL Sentry16192033-2074201.1e-06-2.96-3.070JPL: "Analysis based on 50 observations spanning 4.8719 days (2012-Oct-22.4752 to 2012-Oct-27.347148)." Diameter approximately 0.279 km. from mean, weighted H=20.4.
NEODyS16192033-205597.27e-08-4.37-4.540NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2012-10-22.476 to 2012-10-27.348."
2012 UZ33NEODyS1619R E M O V E D-

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 28 October '12

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

2359Grabbed MPEC 2012-U116 - 2012 UK171 - see above
Grabbed MPEC 2012-U117 - 2012 UL171 - see above
1623Generated Traffic Report
1619Noted that JPL Sentry has updated its 2012 UR158 risk assessment - see above
Noted that NEODyS has updated its 2012 UR158 risk assessment - see above
Noted that NEODyS has posted 2012 UU158 as an impact risk - see above
Noted that NEODyS has posted 2012 UU169 as an impact risk - see above
Noted that NEODyS has removed 2012 UZ33 as an impact risk - see above
Grabbed MPEC 2012-U115 - Daily Orbit Update - see above