Contents  on 25 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 25 August '12

Two objects reported inside ten LD

There are two asteroids reported moving within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, 2012 QH14 comes its closest to Earth this time around, reaching 3.51 LD at 1342 UTC. Further out, 2012 PZ17 exits ten LD, traveling from 9.96 to 10.70 LD.

On approach next, newly announced 2012 QZ16 arrives inside ten LD on August 27th

This report was updated at 2130 UTC with new discovery 2012 QZ16 (MPEC). Today's first traffic report was posted at 1452 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 25 August '12

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 29 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 25 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-Q53 - "23:08 UT" - 1994 EK


MPEC 2012-Q52 - "19:33 UT" - 2012 PP17


MPEC 2012-Q51 - "17:54 UT" - 2012 QB17


MPEC 2012-Q50 - "17:52 UT" - 2012 QA17


MPEC 2012-Q49 - "17:49 UT" - 2012 QZ16


MPEC 2012-Q48 - "17:12 UT" - 2012 QY16


<< DOU on 25 Aug. '12 >>  MPEC 2012-Q47 - "06:03 UT" - Daily Orbit Update

Observers  on 25 August '12

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2012-Q47, 2012-Q48, 2012-Q49, 2012-Q51, 2012-Q52 & 2012-Q53 -- 2012 QZ16, 2012 QY16, 2012 QV2, 2012 QJ2, 2012 QG8, 2012 QD8, 2012 QB17, 2012 PX, 2012 PP28, 2012 PP17, 2012 PJ6, 2012 PG6, 2012 PB20, 2012 NN, 2012 BT23, 2009 KT21, 1994 EK
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-Q47, 2012-Q51 & 2012-Q53 -- 2012 QB17, 2012 PG5, 2012 PC20, 1994 EK, 141874, 5143, 887
470Ceccano Obs. in Italy, 3 in MPECs 2012-Q48, 2012-Q51 & 2012-Q53 -- 2012 QY16, 2012 QB17, 1994 EK
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-Q47 & 2012-Q53 -- 2012 NP, 1994 EK
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2012-Q48 & 2012-Q51 -- 2012 QY16, 2012 QB17
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 2 in MPECs 2012-Q47 & 2012-Q49 -- 2012 QZ16, 214869
157Frasso Sabino Obs. in Italy, 1 in MPEC 2012-Q51 -- 2012 QB17
I16IAA-AI Atacama in Chile, 1 in MPEC 2012-Q47 -- 2012 QQ10
J75La Sagra Obs. in Spain, 2 in MPECs 2012-Q48 & 2012-Q51 -- 2012 QY16, 2012 QB17
900Moriyama Obs. in Japan, 2 in MPECs 2012-Q48 & 2012-Q51 -- 2012 QY16, 2012 QB17
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-Q52 -- 2012 PP17
716Palmer Divide Obs. in Colorado, 2 in MPEC 2012-Q47 -- 2012 AA11, 192642
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2012-Q47, 2012-Q49 & 2012-Q53 -- 2012 QZ16, 1994 EK, 333707, 162269, 4947
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2012-Q47, 2012-Q49, 2012-Q51 & 2012-Q53 -- 2012 QZ16, 2012 QB17, 2012 PX, 2012 PS17, 1994 EK
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-Q50 & 2012-Q53 -- 2012 QA17, 1994 EK
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2012-Q47 & 2012-Q52 -- 2012 PP17, 2012 PN28, 2009 AK15, 2003 AL18, 87311
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2012-Q47 -- 2012 QL14, 2012 PX, 2012 PK24, 2012 LK11
A98Taurus-1 Obs. in Belarus, 4 in MPEC 2012-Q47 -- 2012 PS17, 2012 PG5, 2009 AV, 2000 RN77
I76Tesla Obs. in Spain, 1 in MPEC 2012-Q47 -- 2012 PG5
G56Walnut Creek Obs. in northern California, 1 in MPEC 2012-Q47 -- 52387
718Wiggins Obs. in Utah, 1 in MPEC 2012-Q51 -- 2012 QB17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 Sentry14472033-209061.7e-08-4.60-4.810JPL: "Analysis based on 24 observations spanning 6.8158 days (2012-Aug-17.43953 to 2012-Aug-24.255374)." Diameter approximately 0.715 km. from mean, weighted H=18.4.
2012 QD8JPL Sentry14472032-2111162.1e-05-3.38-3.480JPL: "Analysis based on 24 observations spanning 6.8588 days (2012-Aug-17.44424 to 2012-Aug-24.303084)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
NEODyS14472032-2094121.22e-04-2.61-2.750NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-08-17.445 to 2012-08-24.304."
2012 PK24JPL Sentry14472043-2076163.2e-05-3.75-3.930JPL: "Analysis based on 32 observations spanning 11.740 days (2012-Aug-13.41356 to 2012-Aug-25.15311)." Diameter approximately 0.063 km. from mean, weighted H=23.7.
NEODyS14472043-2094191.23e-05-4.16-4.30NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2012-08-13.414 to 2012-08-25.154."
2012 PB20JPL Sentry14472068-2107273.3e-06-5.85-6.590JPL: "Analysis based on 26 observations spanning 9.8064 days (2012-Aug-14.48152 to 2012-Aug-24.287961)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS14472087-209382.22e-06-6.02-6.410NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-08-24.289."
2012 PXJPL Sentry14472067-210862.8e-06-4.96-5.370JPL: "Analysis based on 115 observations spanning 17.813 days (2012-Aug-07.35157 to 2012-Aug-25.16417)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
NEODyS14472067-210073.48e-07-5.77-5.940NEODyS: "Based on 116 optical observations (of which 2 are rejected as outliers) from 2012-08-07.352 to 2012-08-25.165."

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 25 August '12

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

2315Grabbed MPEC 2012-Q53 - 1994 EK - see above
2130Updated Traffic Report
2006Grabbed MPEC 2012-Q52 - 2012 PP17 - see above
1843Grabbed MPEC 2012-Q49 - 2012 QZ16 - see above
Grabbed MPEC 2012-Q50 - 2012 QA17 - see above
Grabbed MPEC 2012-Q51 - 2012 QB17 - see above
1731Grabbed MPEC 2012-Q48 - 2012 QY16 - see above
1447Noted 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 PK24 risk assessment - see above
Noted that NEODyS has updated its 2012 PK24 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 QD8 risk assessment - see above
Noted that NEODyS has updated its 2012 QD8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 QG8 risk assessment - see above
Grabbed MPEC 2012-Q47 - Daily Orbit Update - see above