Contents  on 17 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 17 August '12

Two objects reported inside ten LD

Two visitors are reported traveling inside ten lunar distances (LD) of Earth today. 2012 PZ17 is outbound from 4.38 to 4.99 LD and 2012 PD20 is inbound from 9.77 to 9.64 LD. No other objects are known to come this close until November.

This report was generated at 1450 UTC with follow-up in today's DOU MPEC for 2012 PD20.


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 17 August '12

Radar observation of three 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 2016 UTC when the database was dated 17 Aug.


Data update noted at 2239 UTC when the database was dated 17 Aug.


Data update noted at 2359 UTC when the database was dated 17 Aug.

NEOCP Activity  on 17 August '12

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 58 listings on the NEOCP today.

New MPECs  on 17 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-Q10 - "16:46 UT" - 2012 PP24


MPEC 2012-Q09 - "16:44 UT" - 2012 PK24


<< DOU on 17 Aug. '12 >>  MPEC 2012-Q08 - "06:02 UT" - Daily Orbit Update

Observers  on 17 August '12

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
B54Ager Obs. in Spain, 2 in MPEC 2012-Q08 -- 20460, 4487
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-Q10 -- 2012 PP24
251Arecibo in Puerto Rico, 3 in radar -- 37655, 326732, 11066
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2012-Q08, 2012-Q09 & 2012-Q10 -- 2012 PX, 2012 PS17, 2012 PP24, 2012 PP17, 2012 PK24, 2012 LF11
A81Balzaretto Obs. in Italy, 3 in MPEC 2012-Q08 -- 2012 LU7, 2012 HG31, 326732
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-Q10 -- 2012 PP24
B66Casasco Obs. in Italy, 1 in MPEC 2012-Q08 -- 5587
470Ceccano Obs. in Italy, 1 in MPEC 2012-Q10 -- 2012 PP24
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2012-Q08, 2012-Q09 & 2012-Q10 -- 2012 PY19, 2012 PP24, 2012 PK24, 2012 PA20
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-Q10 -- 2012 PP24
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-Q08 -- 2012 PZ19
F84Hibiscus Obs. in Tahiti, 1 in MPEC 2012-Q08 -- 2008 RE1
J75La Sagra Obs. in Spain, 1 in MPEC 2012-Q10 -- 2012 PP24
900Moriyama Obs. in Japan, 1 in MPEC 2012-Q10 -- 2012 PP24
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-Q10 -- 2012 PP24
A13Naef Obs. in Switzerland, 3 in MPEC 2012-Q08 -- 2012 NP, 214869, 162900
A24New Millennium Obs. in Italy, 13 in MPEC 2012-Q08 -- 2012 PA, 2012 OO, 2012 OD1, 2012 NP, 2012 LE11, 2012 BZ76, 2012 BC20, 2010 OS22, 2010 OB101, 2009 AV, 2008 JZ30, 2006 DQ62, 2001 QG142
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2012-Q08 & 2012-Q09 -- 2012 PK24, 218863
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2012-Q08 -- 2012 PX, 2012 PS17, 2012 PG6, 2012 PG5, 2012 OD1, 2012 MK6, 2012 LU7, 2010 OS22, 2009 AV, 2000 RN77
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2012-Q08 & 2012-Q10 -- 2012 PX, 2012 PP24, 2012 PJ6, 2012 PG6
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q10 -- 2012 PP24
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-Q10 -- 2012 PP24
194Tivoli Obs. in Namibia, 2 in MPECs 2012-Q08 & 2012-Q10 -- 2012 PP24, 2012 PD20
718Wiggins Obs. in Utah, 1 in MPEC 2012-Q08 -- 2012 PG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 PK24NEODyS22162016-21006683.26e-05-3.61-4.510NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2012-08-13.414 to 2012-08-16.215."
JPL Sentry20162016-21128282.6e-05-3.58-4.100JPL: "Analysis based on 10 observations spanning 2.8002 days (2012-Aug-13.41356 to 2012-Aug-16.213763)." Diameter approximately 0.062 km. from mean, weighted H=23.7.
2012 PA20JPL Sentry14492036-2112274.9e-08-5.67-6.400JPL: "Analysis based on 13 observations spanning 3.5324 days (2012-Aug-13.42278 to 2012-Aug-16.95522)." Diameter approximately 0.152 km. from mean, weighted H=21.8.
NEODyS14492047-2095127.93e-09-6.47-7.050NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2012-08-13.424 to 2012-08-16.956."
2012 PY19JPL Sentry1449R E M O V E DJPL: Risk listing removed at 0859 UTC.
2012 PXJPL Sentry14492067-2108107.9e-06-4.50-5.090JPL: "Analysis based on 51 observations spanning 9.5785 days (2012-Aug-07.35157 to 2012-Aug-16.93007)." Diameter approximately 0.077 km. from mean, weighted H=23.2.
NEODyS14492067-2096126.81e-06-4.55-4.980NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2012-08-07.352 to 2012-08-16.931."

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 17 August '12

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

2359Noted Radar Astrometry database update - see above
2239Noted Radar Astrometry database update - see above
2215Noted that NEODyS has posted 2012 PK24 as an impact risk - see above
2016Noted that JPL Sentry has posted 2012 PK24 as an impact risk - see above
Noted Radar Astrometry database update - see above
1803Grabbed MPEC 2012-Q09 - 2012 PK24 - see above
Grabbed MPEC 2012-Q10 - 2012 PP24 - see above
1450Generated Traffic Report
1449Noted that JPL Sentry has updated its 2012 PA20 risk assessment - see above
Noted that NEODyS has updated its 2012 PA20 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 PY19 as an impact risk - see above
Grabbed MPEC 2012-Q08 - Daily Orbit Update - see above