Contents  on 12 August '13

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 12 August '13

One object reported inside ten LD

One visitor is reported to be within a radius of ten lunar distances (LD) from our planet today. Radar target 277475 2005 WK4 leaves ten LD, passing from 9.62 to 10.77 LD. No other objects are known to be coming this close until mid-November.

This report was generated at 1524 UTC noting the discovery of 2013 PE21 (MPEC), which was announced very late yesterday. This object barely skimmed our ten-LD "reporting bubble" at the beginning of the month, preliminarily calculated to have come to 9.88 LD of Earth on August 1st.

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 12 August '13

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 46 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 12 August '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-P67 - "21:47 UT" - 2013 PJ26

MPEC 2013-P66 - "21:43 UT" - 2013 PF26

MPEC 2013-P65 - "21:38 UT" - 2013 PE26

MPEC 2013-P64 - "21:33 UT" - 2013 PD26

MPEC 2013-P63 - "12:48 UT" - 2009 DZ

MPEC 2013-P62 - "12:42 UT" - 2012 BB2

<< DOU on 12 Aug. '13 >>  MPEC 2013-P61 - "06:03 UT" - Daily Orbit Update

MPEC 2013-P60 - "03:49 UT" - 2012 MO3

Observers  on 12 August '13

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2013-P67 -- 2013 PJ26
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2013-P61, 2013-P65 & 2013-P67 -- 2013 PJ26, 2013 PE26, 2013 OS3, 2013 ON2, 2013 NG6, 2008 DV, 140039
300Bisei Spaceguard Center in Japan, 2 in MPEC 2013-P61 -- 24445, 140039
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2013-P61 -- 39565
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2013-P61 & 2013-P65 -- 2013 PY6, 2013 PW14, 2013 PH10, 2013 PE26, 2013 PD21, 2013 OD4, 2013 NX, 2008 KZ5, 2006 HB, 1996 TP6
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2013-P61 -- 2009 DM1, 2005 JA22
Z81Estrella de Mar Obs., 1 in MPEC 2013-P61 -- 271480
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2013-P65 & 2013-P67 -- 2013 PJ26, 2013 PE26
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-P65 -- 2013 PE26
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-P66 -- 2013 PF26
V37LCOGT Fort Davis in Texas, 1 in MPEC 2013-P67 -- 2013 PJ26
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2013-P64 -- 2013 PD26
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2013-P61 -- 24445
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2013-P60, 2013-P61, 2013-P62 & 2013-P63 -- 2013 EO20, 2012 MO3, 2012 BB2, 2009 DZ
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-P64 -- 2013 PD26
474Mt. John Obs. in New Zealand, 1 in MPEC 2013-P65 -- 2013 PE26
G34Oberfrauendorf Obs., 2 in MPEC 2013-P61 -- 361071, 243147
C27Pallerols Obs. in Spain, 1 in MPEC 2013-P61 -- 52762
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2013-P61 -- 2013 OO5, 2006 QA58
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-P64, 2013-P65, 2013-P66 & 2013-P67 -- 2013 PJ26, 2013 PF26, 2013 PE26, 2013 PD26
A32Panker Obs. in Germany, 1 in MPEC 2013-P61 -- 11405
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-P67 -- 2013 PJ26
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-P65 -- 2013 PE26
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-P67 -- 2013 PJ26
204Schiaparelli Obs. in Italy, 2 in MPECs 2013-P65 & 2013-P67 -- 2013 PJ26, 2013 PE26
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2013-P61, 2013-P65, 2013-P66 & 2013-P67 -- 2013 PV13, 2013 PJ26, 2013 PF26, 2013 PE26
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-P65 & 2013-P67 -- 2013 PJ26, 2013 PE26
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 August '13

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.





Notes for Today's Latest Risk Assessments
2013 PV13JPL Sentry1453R E M O V E DJPL: Risk listing removed at 1242 UTC.
2009 HS44JPL Sentry1453211117.6e-06-5.96-5.960JPL: "Analysis based on 34 observations spanning 3.7866 days (2009-Apr-22.32371 to 2009-Apr-26.110296)." Diameter approximately 0.017 km. from mean, weighted H=26.6.

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 12 August '13

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

2201Grabbed MPEC 2013-P64 - 2013 PD26 - see above
Grabbed MPEC 2013-P65 - 2013 PE26 - see above
Grabbed MPEC 2013-P66 - 2013 PF26 - see above
Grabbed MPEC 2013-P67 - 2013 PJ26 - see above
1524Generated Traffic Report
1453Noted that JPL Sentry has posted 2009 HS44 as an impact risk - see above
Noted that JPL Sentry has removed 2013 PV13 as an impact risk - see above
Grabbed MPEC 2013-P60 - 2012 MO3 - see above
Grabbed MPEC 2013-P61 - Daily Orbit Update - see above
Grabbed MPEC 2013-P62 - 2012 BB2 - see above
Grabbed MPEC 2013-P63 - 2009 DZ - see above