Contents  on 16 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 16 August '12

Two objects reported inside ten LD

Two objects are reported to be within ten lunar distances (LD) of Earth today. 2012 PZ17 exits Earth's Hill sphere, flying from 3.84 to 4.38 LD, and newly announced 2012 PD20 dips inside ten LD, moving from 10.09 to 9.77 LD. No other objects are known to be coming this close until November.

This report was updated at 2159 UTC with new discovery 2012 PD20 (MPEC) and, earlier, with observation of 2008 GP3 from April 2008 in today's DOU MPEC as well as follow-up for 2012 PZ17, the discovery of which was announced yesterday (MPEC). Earlier postings were at 0050 and 1503 UTC.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 16 August '12

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 74 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 16 August '12

Minor Planet Electronic Circulars

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


MPEC 2012-Q07 - "18:44 UT" - 2012 PD20


MPEC 2012-Q06 - "18:42 UT" - 2012 PC20


MPEC 2012-Q05 - "18:40 UT" - 2012 PB20


MPEC 2012-Q04 - "18:34 UT" - 2012 PA20


MPEC 2012-Q03 - "18:32 UT" - 2012 PZ19


MPEC 2012-Q02 - "18:29 UT" - 2012 PY19


<< DOU on 16 Aug. '12 >>  MPEC 2012-Q01 - "06:02 UT" - Daily Orbit Update

Observers  on 16 August '12

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-Q01 -- 2012 PG6
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-Q06 -- 2012 PC20
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2012-Q01, 2012-Q03, 2012-Q04, 2012-Q05 & 2012-Q06 -- 2012 PZ19, 2012 PH6, 2012 PG5, 2012 PC20, 2012 PB20, 2012 PA20, 2012 LD1
B66Casasco Obs. in Italy, 3 in MPEC 2012-Q01 -- 217013, 5587, 4487
160Castelmartini Obs. in Italy, 1 in MPEC 2012-Q01 -- 37655
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-Q01 & 2012-Q02 -- 2012 PY19, 2012 PH6, 2012 HS15
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-Q04 -- 2012 PA20
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-Q03 & 2012-Q05 -- 2012 PZ19, 2012 PB20
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-Q02 -- 2012 PY19
704LINEAR in New Mexico, 1 in MPEC 2012-Q01 -- 2012 OO
711McDonald Obs. in Texas, 1 in MPEC 2012-Q06 -- 2012 PC20
900Moriyama Obs. in Japan, 1 in MPEC 2012-Q06 -- 2012 PC20
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-Q07 -- 2012 PD20
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2012-Q02, 2012-Q03, 2012-Q04, 2012-Q05 & 2012-Q06 -- 2012 PZ19, 2012 PY19, 2012 PC20, 2012 PB20, 2012 PA20
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-Q06 -- 2012 PC20
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-Q01 & 2012-Q07 -- 2012 PZ17, 2012 PD20
H85Silver Spring Obs. in Maryland, 1 in MPEC 2012-Q01 -- 2008 EF9
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-Q02 -- 2012 PY19
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-Q06 -- 2012 PC20
F85Tiki Obs. in Tahiti, 1 in MPEC 2012-Q01 -- 2008 GP3
194Tivoli Obs. in Namibia, 2 in MPECs 2012-Q01 & 2012-Q07 -- 2012 PS17, 2012 PD20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 PB20JPL Sentry22082024-21126001.3e-04-4.07-4.870JPL: "Analysis based on 10 observations spanning 2.1227 days (2012-Aug-14.48152 to 2012-Aug-16.604252)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS22082025-2099693.54e-05-4.60-5.520NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-16.605."
2012 PA20JPL Sentry22082024-21122713.0e-07-5.07-6.080JPL: "Analysis based on 10 observations spanning 2.7664 days (2012-Aug-13.42278 to 2012-Aug-16.189159)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
NEODyS22082032-2100703.12e-08-5.79-6.510NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2012-08-13.424 to 2012-08-16.190."
2012 PY19JPL Sentry20302045-209862.3e-08-9.23-9.420JPL: "Analysis based on 14 observations spanning 1.6716 days (2012-Aug-13.41356 to 2012-Aug-15.08516)." Diameter approximately 0.010 km. from mean, weighted H=27.8.

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 16 August '12

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

2208Noted that JPL Sentry has posted 2012 PA20 as an impact risk - see above
Noted that NEODyS has posted 2012 PA20 as an impact risk - see above
Noted that JPL Sentry has posted 2012 PB20 as an impact risk - see above
Noted that NEODyS has posted 2012 PB20 as an impact risk - see above
2159Updated Traffic Report
2030Noted that JPL Sentry has posted 2012 PY19 as an impact risk - see above
1921Grabbed MPEC 2012-Q02 - 2012 PY19 - see above
Grabbed MPEC 2012-Q03 - 2012 PZ19 - see above
Grabbed MPEC 2012-Q04 - 2012 PA20 - see above
Grabbed MPEC 2012-Q05 - 2012 PB20 - see above
Grabbed MPEC 2012-Q06 - 2012 PC20 - see above
Grabbed MPEC 2012-Q07 - 2012 PD20 - see above
1500Grabbed MPEC 2012-Q01 - Daily Orbit Update - see above