Contents  on 29 August '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 29 August '12

Two objects reported inside ten LD

Two objects are reported to be within ten lunar distances (LD) of our planet today. 2012 QZ16 is inbound from 8.10 to 7.07 LD and 2012 QH14 exits ten LD, passing from 9.04 to 11.31 LD.

Coming our way next, radar target 2012 QG42 arrives inside ten LD on September 11th.

This report was generated at 1410 UTC with follow-up in today's DOU MPEC for 2012 QG42 and departed 2012 QB18.

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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 29 August '12

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of nineteen 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 29 August '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-Q76 - "19:45 UT" - 2005 NK1 = 2012 QA17

MPEC 2012-Q75 - "14:58 UT" - 2012 QK45

MPEC 2012-Q74 - "14:56 UT" - 2012 QJ45

<< DOU on 29 Aug. '12 >>  MPEC 2012-Q73 - "06:03 UT" - Daily Orbit Update

Observers  on 29 August '12

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2012-Q73 & 2012-Q74 -- 2012 QY14, 2012 QJ45, 2012 QB18, 2012 PP17, 2012 OD1, 1998 FX134
160Castelmartini Obs. in Italy, 9 in MPEC 2012-Q73 -- 2012 QP17, 2012 QB17, 2012 PX, 2012 PS17, 2001 QM142, 2000 RN77, 1998 QC1, 330825, 329340
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2012-Q73 & 2012-Q74 -- 2012 QJ45, 2012 BZ76, 5587
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2012-Q74 & 2012-Q76 -- 2012 QJ45, 2012 QA17
203GiaGa Obs. in Italy, 4 in MPEC 2012-Q73 -- 2012 PX, 2010 OS22, 2000 RN77, 4487
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-Q75 -- 2012 QK45
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-Q75 -- 2012 QK45
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2012-Q73 -- 2009 SO103, 2002 RT129, 2001 QM142, 277127
I89Nerpio Obs. in Italy, 1 in MPEC 2012-Q73 -- 2012 QG42
A24New Millennium Obs. in Italy, 21 in MPEC 2012-Q73 -- 2012 NP, 2012 NO, 2012 MM11, 2012 LE11, 2012 BC20, 2010 OS22, 2010 LG14, 2001 QG142, 333707, 333284, 330825, 304640, 219071, 20460, 144411, 138847, 105140, 8035, 4947, 4487, 1685
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 4 in MPEC 2012-Q73 -- 2012 QC8, 2012 PG5, 2012 LU7, 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2012-Q73 & 2012-Q75 -- 2012 QK45, 333521, 329340
461SZTE Asteroid Program in Hungary, 2 in MPEC 2012-Q73 -- 99942, 175706
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q74 -- 2012 QJ45
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2012-Q73 & 2012-Q74 -- 2012 QJ45, 2012 QG42, 2012 QA17
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2012-Q73 -- 2012 QD8, 2012 QB18, 2012 PX, 2012 PK24
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 August '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 QB18JPL Sentry1406210825.8e-08-6.99-7.250JPL: "Analysis based on 22 observations spanning 2.9188 days (2012-Aug-25.4922 to 2012-Aug-28.410973)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
2012 QD8JPL Sentry14062047-211184.6e-05-3.03-3.040JPL: "Analysis based on 33 observations spanning 10.909 days (2012-Aug-17.44424 to 2012-Aug-28.35303)." Diameter approximately 0.083 km. from mean, weighted H=23.1.
NEODyS14062044-209865.61e-05-2.94-2.940NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2012-08-17.445 to 2012-08-28.354."
2012 PK24JPL Sentry14062043-2076144.1e-05-3.63-3.710JPL: "Analysis based on 38 observations spanning 14.955 days (2012-Aug-13.41356 to 2012-Aug-28.36813)." Diameter approximately 0.064 km. from mean, weighted H=23.6.
NEODyS14062038-2064171.6e-05-4.02-4.10NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2012-08-13.414 to 2012-08-28.369."
2012 PXJPL Sentry14062067-210851.7e-06-5.24-5.320JPL: "Analysis based on 155 observations spanning 21.680 days (2012-Aug-07.35157 to 2012-Aug-29.03149)." Diameter approximately 0.080 km. from mean, weighted H=23.1.

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 29 August '12

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

2048Grabbed MPEC 2012-Q76 - 2005 NK1 = 2012 QA17 - see above
1508Grabbed MPEC 2012-Q74 - 2012 QJ45 - see above
Grabbed MPEC 2012-Q75 - 2012 QK45 - see above
1410Generated Traffic Report
1406Noted that JPL Sentry has updated its 2012 PK24 risk assessment - see above
Noted that NEODyS has updated its 2012 PK24 risk assessment - see above
Noted that JPL Sentry has updated its 2012 PX risk assessment - see above
Noted that JPL Sentry has updated its 2012 QB18 risk assessment - see above
Noted that JPL Sentry has updated its 2012 QD8 risk assessment - see above
Noted that NEODyS has updated its 2012 QD8 risk assessment - see above
Grabbed MPEC 2012-Q73 - Daily Orbit Update - see above