Contents  on 23 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 23 August '12

Two objects reported inside ten LD

There are two objects reported passing within ten lunar distances (LD) of Earth today. Newly announced 2012 QH14 is inbound from 7.17 to 5.19 LD and 2012 PZ17 is outbound from 8.48 to 9.22 LD. No other objects are known to be coming inside ten LD until November.

This report was updated at 2202 UTC with new discovery 2012 QM14 (MPEC), which has already departed ten LD, and, earlier, with newly announced 2012 QH14 (MPEC) and follow-up in today's DOU MPEC for 2012 PZ17. Earlier postings were at 1526 and 2030 UTC.

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 23 August '12

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 25 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 23 August '12

Minor Planet Electronic Circulars

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

MPEC 2012-Q44 - "19:57 UT" - 2012 QM14

MPEC 2012-Q43 - "19:15 UT" - 2011 YA

MPEC 2012-Q42 - "19:13 UT" - 2008 XE2

MPEC 2012-Q41 - "18:20 UT" - 2012 QK14

MPEC 2012-Q40 - "18:18 UT" - 2012 QJ14

MPEC 2012-Q39 - "18:15 UT" - 2012 QH14

MPEC 2012-Q38 - "15:37 UT" - 1999 SF10

<< DOU on 23 Aug. '12 >>  MPEC 2012-Q37 - "06:03 UT" - Daily Orbit Update

Observers  on 23 August '12

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2012-Q37, 2012-Q40, 2012-Q41, 2012-Q42, 2012-Q43 & 2012-Q44 -- 2012 QM14, 2012 QK14, 2012 QJ2, 2012 QJ14, 2012 QG8, 2012 PX, 2012 PS17, 2012 PP24, 2012 PP17, 2012 PO17, 2012 PN28, 2012 PG5, 2012 PC20, 2012 PB20, 2012 OE1, 2012 OB1, 2011 YA, 2008 XE2
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-Q37 -- 2012 LU7
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-Q37 -- 87311
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2012-Q38, 2012-Q39 & 2012-Q40 -- 2012 QJ14, 2012 QH14, 1999 SF10
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2012-Q41 & 2012-Q44 -- 2012 QM14, 2012 QK14
474Mt. John Obs. in New Zealand, 13 in MPECs 2012-Q37, 2012-Q39 & 2012-Q40 -- 2012 QV2, 2012 QJ14, 2012 QH8, 2012 QH14, 2012 PX, 2012 PS4, 2012 PN6, 2012 PH6, 2012 PG5, 2012 OU5, 2012 OT5, 2012 OP4, 2012 OC1
J93Mt. Tuffley Obs. in England, 3 in MPEC 2012-Q37 -- 276397, 5587, 4179
716Palmer Divide Obs. in Colorado, 4 in MPEC 2012-Q37 -- 179806, 16960, 153591, 11398
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2012-Q37, 2012-Q38, 2012-Q39, 2012-Q40, 2012-Q41 & 2012-Q44 -- 2012 QM14, 2012 QK14, 2012 QJ14, 2012 QH14, 1999 SF10, 85184, 52381, 329340, 218863
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-Q37 -- 2012 PX, 2012 PS17, 2012 PP24, 2012 PG5, 2012 OD1, 2012 LU7, 2009 AV, 2000 RN77
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q40 -- 2012 QJ14
B38Santa Mama Obs. in Italy, 3 in MPEC 2012-Q37 -- 2009 AV, 105140, 5587
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-Q37 -- 2012 PZ17
A98Taurus-1 Obs. in Belarus, 2 in MPEC 2012-Q37 -- 2012 LE11, 2012 BZ76
194Tivoli Obs. in Namibia, 1 in MPEC 2012-Q37 -- 2012 KK18
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 QG8JPL Sentry15252020-2099213.1e-08-3.63-4.120JPL: "Analysis based on 21 observations spanning 4.8368 days (2012-Aug-17.43953 to 2012-Aug-22.276344)." Diameter approximately 0.858 km. from mean, weighted H=18.0.
NEODyS15252099-209916.21e-09-5.61-5.610NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2012-08-17.440 to 2012-08-22.277."
2012 PB20JPL Sentry15252068-2111382.9e-06-5.93-6.630JPL: "Analysis based on 23 observations spanning 7.8197 days (2012-Aug-14.48152 to 2012-Aug-22.301194)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS15252068-209361.02e-06-6.37-6.850NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-22.302."
2012 PXJPL Sentry15252067-210894.6e-06-4.72-5.030JPL: "Analysis based on 89 observations spanning 15.239 days (2012-Aug-07.35157 to 2012-Aug-22.59096)." Diameter approximately 0.079 km. from mean, weighted H=23.1.
NEODyS15252067-209673.46e-06-4.75-4.870NEODyS: "Based on 90 optical observations (of which 2 are rejected as outliers) from 2012-08-07.352 to 2012-08-22.592."
1999 SF10JPL Sentry1902R E M O V E DJPL: Risk listing removed at 1818 UTC.

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 23 August '12

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

2202Updated Traffic Report
2034Grabbed MPEC 2012-Q42 - 2008 XE2 - see above
Grabbed MPEC 2012-Q43 - 2011 YA - see above
Grabbed MPEC 2012-Q44 - 2012 QM14 - see above
1902Noted that JPL Sentry has removed 1999 SF10 as an impact risk - see above
Grabbed MPEC 2012-Q39 - 2012 QH14 - see above
Grabbed MPEC 2012-Q40 - 2012 QJ14 - see above
Grabbed MPEC 2012-Q41 - 2012 QK14 - see above
1604Grabbed MPEC 2012-Q38 - 1999 SF10 - see above
1525Noted that JPL Sentry has updated its 2012 PB20 risk assessment - see above
Noted that NEODyS has updated its 2012 PB20 risk assessment - see above
Noted that JPL Sentry has updated its 2012 PX risk assessment - see above
Noted that NEODyS has updated its 2012 PX risk assessment - see above
Noted that JPL Sentry has updated its 2012 QG8 risk assessment - see above
Noted that NEODyS has updated its 2012 QG8 risk assessment - see above
Grabbed MPEC 2012-Q37 - Daily Orbit Update - see above