Contents  on 21 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 21 August '12

One object reported inside ten LD

One object is reported to be within ten lunar distances (LD) of our planet today. 2012 PZ17 is outbound from 7.03 to 7.75 LD. No other objects are known to come inside ten LD until November.

This report was generated at 1522 UTC with follow-up in today's DOU MPEC for 2012 PZ17.


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.

Radar Astrometry  on 21 August '12

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0058 UTC when the database was dated 20 Aug.


Data update noted at 2100 UTC when the database was dated 21 Aug.

NEOCP Activity  on 21 August '12

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 31 listings on the NEOCP today.

New MPECs  on 21 August '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-Q30 - "17:14 UT" - 2012 QH8


MPEC 2012-Q29 - "14:45 UT" - 2012 QG8


<< DOU on 21 Aug. '12 >>  MPEC 2012-Q28 - "06:03 UT" - Daily Orbit Update

Observers  on 21 August '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-Q28 -- 2012 PP28
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-Q28 -- 2012 QC8
251Arecibo in Puerto Rico, 2 in radar -- 85989, 144411
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2012-Q28, 2012-Q29 & 2012-Q30 -- 2012 QH8, 2012 QG8, 2012 QC8, 2012 PX, 2012 PW, 2012 PP28, 2012 PP24, 2012 PN28, 2012 PJ6, 2012 PG6, 2012 PA20, 2012 FD1, 2005 HD4
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2012-Q28 -- 2005 GQ21
160Castelmartini Obs. in Italy, 17 in MPEC 2012-Q28 -- 2012 PS17, 2012 PP24, 2012 PN6, 2012 PG5, 2012 OO, 2012 LU7, 2012 LE11, 2000 RN77, 1998 QC1, 333284, 330825, 329340, 326732, 277475, 214869, 153958, 144411
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2012-Q28 & 2012-Q30 -- 2012 QV2, 2012 QH8, 2012 PZ17, 2012 PQ28, 2012 PP28, 2012 PH6
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-Q29 -- 2012 QG8
157Frasso Sabino Obs. in Italy, 5 in MPEC 2012-Q28 -- 2012 PS17, 2012 PP17, 2012 PG6, 2012 PG5, 2006 OT9
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 144411
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2012-Q29 -- 2012 QG8
A24New Millennium Obs. in Italy, 7 in MPEC 2012-Q28 -- 2010 OS22, 2009 AV, 333358, 331963, 217013, 105140, 4487
716Palmer Divide Obs. in Colorado, 2 in MPEC 2012-Q28 -- 69230, 185851
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2012-Q28 & 2012-Q29 -- 2012 QG8, 67367, 1221
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-Q28 & 2012-Q29 -- 2012 QG8, 2012 PB20
B38Santa Mama Obs. in Italy, 4 in MPEC 2012-Q28 -- 2012 HG31, 2010 OS22, 2009 AV, 105140
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-Q28 & 2012-Q30 -- 2012 QH8, 2012 QC8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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.
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 QG8JPL Sentry21002019-2107453.4e-07-3.11-3.720JPL: "Analysis based on 18 observations spanning 3.8002 days (2012-Aug-17.43953 to 2012-Aug-21.239695)." Diameter approximately 0.709 km. from mean, weighted H=18.4.
NEODyS16272019-2087263.19e-08-3.36-3.840NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2012-08-17.440 to 2012-08-21.240."
2012 QC8JPL Sentry1519R E M O V E DJPL: Risk listing removed at 0851 UTC.
2012 PN28JPL Sentry15192052-207723.0e-10-6.30-6.580JPL: "Analysis based on 13 observations spanning 6.8422 days (2012-Aug-13.41619 to 2012-Aug-20.2584)." Diameter approximately 0.750 km. from mean, weighted H=18.3.
2012 PB20JPL Sentry15192048-2111885.2e-06-5.71-6.590JPL: "Analysis based on 16 observations spanning 5.7808 days (2012-Aug-14.48152 to 2012-Aug-20.2623)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
NEODyS15192090-210062.27e-06-6.05-6.470NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-20.263."
2012 PA20JPL Sentry1519R E M O V E DJPL: Risk listing removed at 0850 UTC.
2012 PXJPL Sentry15192067-210876.7e-06-4.52-4.920JPL: "Analysis based on 59 observations spanning 12.751 days (2012-Aug-07.35157 to 2012-Aug-20.10222)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
NEODyS15192067-209464.96e-06-4.63-4.960NEODyS: "Based on 59 optical observations (of which 1 are rejected as outliers) from 2012-08-07.352 to 2012-08-20.103."

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 21 August '12

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

2100Noted that JPL Sentry has posted 2012 QG8 as an impact risk - see above
Grabbed MPEC 2012-Q30 - 2012 QH8 - see above
Noted Radar Astrometry database update - see above
1627Noted that NEODyS has posted 2012 QG8 as an impact risk - see above
1522Generated Traffic Report
1519Noted that JPL Sentry has removed 2012 PA20 as an impact risk - see above
Noted 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 PN28 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 removed 2012 QC8 as an impact risk - see above
Grabbed MPEC 2012-Q28 - Daily Orbit Update - see above
Grabbed MPEC 2012-Q29 - 2012 QG8 - see above
0058Noted Radar Astrometry database update - see above