Contents  on 18 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 18 August '12

Two objects reported inside ten LD

There are two asteroids reported flying inside ten lunar distances (LD) of Earth today. 2012 PZ17 is outbound from 4.99 to 5.64 LD and 2012 PD20 comes its closest to Earth this time around, reaching 9.66 LD at 0419 UTC. No other objects are known to come this close again until November.

This report was generated at 1539 UTC and today's distance numbers were revised at 1643 for 2012 PD20 and 2012 PZ17, which have follow-up in today's DOU MPEC along with distant 207398 2006 AS2.


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 18 August '12

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 38 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 18 August '12

Minor Planet Electronic Circulars

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


MPEC 2012-Q20 - "17:32 UT" - 2012 QK2


MPEC 2012-Q19 - "17:30 UT" - 2012 QJ2


MPEC 2012-Q18 - "16:56 UT" - 2012 BB14


MPEC 2012-Q17 - "15:19 UT" - 2012 PQ28


MPEC 2012-Q16 - "15:13 UT" - 2012 PP28


MPEC 2012-Q15 - "15:11 UT" - 2012 PO28


MPEC 2012-Q14 - "15:09 UT" - 2012 PN28


MPEC 2012-Q13 - "15:07 UT" - 2012 PM28


<< DOU on 18 Aug. '12 >>  MPEC 2012-Q12 - "06:03 UT" - Daily Orbit Update


MPEC 2012-Q11 - "00:23 UT" - 2012 PD26

Observers  on 18 August '12

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-Q16 -- 2012 PP28
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-Q17 -- 2012 PQ28
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2012-Q11, 2012-Q12, 2012-Q13, 2012-Q14, 2012-Q16, 2012-Q18 & 2012-Q19 -- 2012 QJ2, 2012 PP28, 2012 PN28, 2012 PM28, 2012 PG5, 2012 PD26, 2012 BB14
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-Q12 -- 2009 AV
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-Q16 -- 2012 PP28
470Ceccano Obs. in Italy, 1 in MPEC 2012-Q16 -- 2012 PP28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-Q16 -- 2012 PP28
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-Q12 -- 333358
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2012-Q12, 2012-Q13 & 2012-Q16 -- 2012 PP28, 2012 PM28, 2012 PA20
151Eschenberg Obs. in Switzerland, 3 in MPEC 2012-Q12 -- 2009 AV, 2000 RN77, 1998 QC1
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 2 in MPECs 2012-Q11 & 2012-Q15 -- 2012 PO28, 2012 PD26
203GiaGa Obs. in Italy, 6 in MPEC 2012-Q12 -- 2012 PS17, 2012 PN6, 2012 PG5, 2009 AV, 2000 RN77, 217013
J95Great Shefford Obs. in England, 4 in MPECs 2012-Q12, 2012-Q16, 2012-Q19 & 2012-Q20 -- 2012 QK2, 2012 QJ2, 2012 PP28, 2012 OP4
J87La Canada Obs. in Spain, 1 in MPEC 2012-Q16 -- 2012 PP28
J75La Sagra Obs. in Spain, 1 in MPEC 2012-Q16 -- 2012 PP28
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2012-Q12 -- 329340
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-Q12 -- 2009 UN3
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2012-Q11 -- 2012 PD26
474Mt. John Obs. in New Zealand, 12 in MPECs 2012-Q12, 2012-Q16 & 2012-Q17 -- 2012 PZ17, 2012 PX, 2012 PS4, 2012 PS17, 2012 PQ28, 2012 PP28, 2012 PH6, 2012 PD20, 2012 OZ, 2012 OU5, 2012 OT5, 2012 OP4
A13Naef Obs. in Switzerland, 1 in MPEC 2012-Q12 -- 2012 BC20
A24New Millennium Obs. in Italy, 24 in MPEC 2012-Q12 -- 2012 PA, 2010 OS22, 2009 AV, 2008 JZ30, 88263, 333707, 333578, 333358, 331963, 329340, 304640, 217013, 20460, 162980, 153415, 138847, 108906, 105140, 8035, 4947, 4587, 4581, 4487, 1685
C27Pallerols Obs. in Spain, 2 in MPEC 2012-Q12 -- 326732, 154007
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2012-Q11, 2012-Q12, 2012-Q13, 2012-Q14, 2012-Q15 & 2012-Q19 -- 2012 QJ2, 2012 PO28, 2012 PN28, 2012 PM28, 2012 PD26, 2012 MK6, 2007 EM88, 2004 CR2, 1996 FO3, 207398, 887
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2012-Q12, 2012-Q14 & 2012-Q19 -- 2012 QJ2, 2012 PN28, 2012 PB20
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-Q16, 2012-Q19 & 2012-Q20 -- 2012 QK2, 2012 QJ2, 2012 PP28
E12Siding Spring Survey (SSS) in New South Wales, 7 in MPECs 2012-Q12, 2012-Q16, 2012-Q17 & 2012-Q20 -- 2012 QK2, 2012 PZ17, 2012 PS4, 2012 PQ28, 2012 PP28, 2012 PD20, 331999
954Teide Obs. in the Canary Islands, 2 in MPECs 2012-Q12 & 2012-Q17 -- 2012 PQ28, 2012 PP24
194Tivoli Obs. in Namibia, 1 in MPEC 2012-Q17 -- 2012 PQ28
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 PN28JPL Sentry18002052-2111133.3e-08-4.36-4.610JPL: "Analysis based on 9 observations spanning 4.6221 days (2012-Aug-13.41619 to 2012-Aug-18.03833)." Diameter approximately 0.694 km. from mean, weighted H=18.4.
2012 PB20JPL Sentry15342039-21123335.9e-06-5.58-6.600JPL: "Analysis based on 13 observations spanning 3.6110 days (2012-Aug-14.48152 to 2012-Aug-18.09249)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
NEODyS15342077-2093121.39e-06-6.28-7.030NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-18.093."
2012 PA20JPL Sentry15342047-210974.1e-09-6.80-7.270JPL: "Analysis based on 16 observations spanning 4.5302 days (2012-Aug-13.42278 to 2012-Aug-17.95299)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS1534R E M O V E D-
2012 PXJPL Sentry15342067-210897.4e-06-4.47-5.010JPL: "Analysis based on 55 observations spanning 10.114 days (2012-Aug-07.35157 to 2012-Aug-17.46583)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
NEODyS15342067-2096127.55e-06-4.44-4.870NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2012-08-07.352 to 2012-08-17.467."

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 18 August '12

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

1800Noted that JPL Sentry has posted 2012 PN28 as an impact risk - see above
Grabbed MPEC 2012-Q18 - 2012 BB14 - see above
Grabbed MPEC 2012-Q19 - 2012 QJ2 - see above
Grabbed MPEC 2012-Q20 - 2012 QK2 - see above
1539Generated Traffic Report
1534Noted that JPL Sentry has updated its 2012 PA20 risk assessment - see above
Noted that NEODyS 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 PX risk assessment - see above
Noted that NEODyS has updated its 2012 PX risk assessment - see above
Grabbed MPEC 2012-Q12 - Daily Orbit Update - see above
Grabbed MPEC 2012-Q13 - 2012 PM28 - see above
Grabbed MPEC 2012-Q14 - 2012 PN28 - see above
Grabbed MPEC 2012-Q15 - 2012 PO28 - see above
Grabbed MPEC 2012-Q16 - 2012 PP28 - see above
Grabbed MPEC 2012-Q17 - 2012 PQ28 - see above
0037Grabbed MPEC 2012-Q11 - 2012 PD26 - see above