Contents  on 27 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 27 October '12

Four objects reported inside ten LD

Four objects are reported inside ten lunar distances (LD) of our home world today. Newly announced 2012 UU169 is inbound from 7.04 to 4.85 LD while the other three cross the ten-LD artificial boundary: 2012 UW9 enters from 10.5 to 9.7 LD* and 2012 UX136 from 11.0 to 9.8 LD*, and 2012 TP231 exits from 9.76 to 11.14 LD.

Headed our way 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 updated at 2215 UTC with new discovery 2012 UU169 (MPEC). Today's first traffic report was generated at 1616 UTC with radar observation of 2012 QG42 from last month and follow-up in today's DOU MPEC for 2012 UX136 and 2012 UV136.

Additional comment: We noted at 1702 UTC that the DOU today reports each observation twice and JPL had not yet posted new orbit solutions for those last two objects. JPL has now posted new solutions and we have updated our related pages.

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

Radar Astrometry  on 27 October '12

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 0132 UTC when the database was dated 26 Oct.

NEOCP Activity  on 27 October '12

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 52 listings on the NEOCP today.

New MPECs  on 27 October '12

Minor Planet Electronic Circulars

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

MPEC 2012-U114 - "20:22 UT" - 1998 WL4

MPEC 2012-U113 - "19:52 UT" - 2012 UU169

MPEC 2012-U112 - "19:44 UT" - 2012 UT169

MPEC 2012-U111 - "19:41 UT" - 2012 US169

<< DOU on 27 Oct. '12 >>  MPEC 2012-U110 - "06:08 UT" - Daily Orbit Update

Observers  on 27 October '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2012 QG42
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2012-U113 & 2012-U114 -- 2012 UU169, 1998 WL4
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2012-U110, 2012-U113 & 2012-U114 -- 2012 UU169, 1998 WL4, 220839, 3200, 1685
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2012-U110 -- 2012 UX136, 2007 YK, 333578, 322652, 317685, 232368, 154278
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-U110 -- 2012 UW27, 2012 US9, 2012 TD53, 237442, 162911
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-U110 -- 2012 UV136
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-U111 -- 2012 US169
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2012-U110 -- 2012 TX52, 2012 TF53, 2012 QK14
711McDonald Obs. in Texas, 1 in MPEC 2012-U111 -- 2012 US169
900Moriyama Obs. in Japan, 1 in MPEC 2012-U113 -- 2012 UU169
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-U110 & 2012-U112 -- 2012 UT169, 2012 TX78, 5587
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2012-U111 & 2012-U112 -- 2012 UT169, 2012 US169
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-U113 & 2012-U114 -- 2012 UU169, 1998 WL4
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-U110 -- 153306
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2012-U110, 2012-U111 & 2012-U112 -- 2012 UZ33, 2012 UU68, 2012 UT169, 2012 US169
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-U114 -- 1998 WL4
198Wildberg Obs. in Germany, 1 in MPEC 2012-U114 -- 1998 WL4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 UR158NEODyS16132033-2081211.72e-07-3.97-4.260NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2012-10-22.476 to 2012-10-26.472."
2012 UU68JPL Sentry1612210111.7e-08-7.26-7.260JPL: "Analysis based on 39 observations spanning 7.9405 days (2012-Oct-18.55712 to 2012-Oct-26.49767)." Diameter approximately 0.082 km. from mean, weighted H=23.1.
2012 UZ33JPL Sentry1612209812.4e-10-7.06-7.060JPL: "Analysis based on 44 observations spanning 9.0247 days (2012-Oct-17.44832 to 2012-Oct-26.47302)." Diameter approximately 0.470 km. from mean, weighted H=19.3.

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 27 October '12

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

2215Updated Traffic Report
2050Grabbed MPEC 2012-U114 - 1998 WL4 - see above
2015Grabbed MPEC 2012-U111 - 2012 US169 - see above
Grabbed MPEC 2012-U112 - 2012 UT169 - see above
Grabbed MPEC 2012-U113 - 2012 UU169 - see above
1614Grabbed MPEC 2012-U110 - Daily Orbit Update - see above
1612Noted that NEODyS has posted 2012 UR158 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 UU68 risk assessment - see above
Noted that JPL Sentry has updated its 2012 UZ33 risk assessment - see above
0132Noted Radar Astrometry database update - see above