Contents  on 11 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 11 August '13

Two objects reported inside ten LD

There are two objects reported within ten lunar distances (LD) of Earth today. Intruder 2013 PS13 (risk-listed radar target) departs from inside ten LD, traveling from 6.94 to 10.82 LD, and radar target 277475 2005 WK4 is outbound from 8.74 to 9.62 LD.

This report was generated at 1536 UTC with follow-up in today's DOU MPEC for 277475 2005 WK4 and two departed objects, intruder 2013 PJ10 and risk-listed 2013 PG10.

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 11 August '13

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 45 listings on the NEOCP today.

New MPECs  on 11 August '13

Minor Planet Electronic Circulars

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

MPEC 2013-P59 - "22:31 UT" - 2013 PF21

MPEC 2013-P58 - "22:27 UT" - 2013 PE21

MPEC 2013-P57 - "22:23 UT" - 2013 PD21

<< DOU on 11 Aug. '13 >>  MPEC 2013-P56 - "06:03 UT" - Daily Orbit Update

Observers  on 11 August '13

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-P58 -- 2013 PE21
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-P56 & 2013-P59 -- 2013 PF21, 2013 OO2, 2013 MY6
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-P56 -- 85804, 24445
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2013-P58 & 2013-P59 -- 2013 PF21, 2013 PE21
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2013-P56 & 2013-P57 -- 2013 PD21, 2013 OD4, 2013 NX, 2013 NT11, 2013 MR6, 2003 OV
151Eschenberg Obs. in Switzerland, 1 in MPEC 2013-P56 -- 2010 TN54
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-P57 -- 2013 PD21
203GiaGa Obs. in Italy, 1 in MPEC 2013-P58 -- 2013 PE21
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-P56 -- 2010 CF19
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2013-P59 -- 2013 PF21
K38M57 Obs., 1 in MPEC 2013-P56 -- 2010 LG14
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-P56 -- 2013 ND15
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2013-P56 & 2013-P57 -- 2013 PW14, 2013 PS20, 2013 PD21
474Mt. John Obs. in New Zealand, 2 in MPECs 2013-P57 & 2013-P58 -- 2013 PE21, 2013 PD21
C47Nonndorf Obs. in Austria, 1 in MPEC 2013-P56 -- 2013 PJ10
C27Pallerols Obs. in Spain, 5 in MPEC 2013-P56 -- 85804, 52762, 361071, 24445, 9950
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-P56 -- 2013 PV13
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-P56 & 2013-P57 -- 2013 PD21, 2013 OH, 2009 QO5, 277830
D03Rantiga Obs., 1 in MPEC 2013-P56 -- 277475
Y00SONEAR Obs. in Brazil, 37 in MPECs 2013-P56, 2013-P57 & 2013-P58 -- 2013 PV6, 2013 PE21, 2013 PD21, 2013 PC7, 2013 PA7, 2013 OH, 2013 NX23, 2013 NX, 2010 UX95, 2010 TN54, 2010 AF30, 2009 WE253, 2006 NL, 89830, 86829, 54789, 53435, 52762, 39565, 303262, 280136, 243147, 242450, 242216, 232691, 17182, 159609, 153349, 140039, 137802, 11405, 6037, 4769, 4486, 2100, 2063, 1627
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-P57, 2013-P58 & 2013-P59 -- 2013 PF21, 2013 PE21, 2013 PD21
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-P58 -- 2013 PE21
G401program code 1 via Canary Islands Obs. in the Canary Islands, 2 in MPEC 2013-P56 -- 24445, 3691
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2013-P56 & 2013-P57 -- 2013 PY6, 2013 PH10, 2013 PG10, 2013 PD21, 2013 OM2, 2013 NJ15, 2013 NE15
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-P57 & 2013-P58 -- 2013 PE21, 2013 PD21
A79Zvezdno Obshtestvo Obs. in Bulgaria, 1 in MPEC 2013-P58 -- 2013 PE21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 Sentry1533209316.1e-09-6.25-6.250JPL: "Analysis based on 36 observations spanning 2.4570 days (2013-Aug-06.98874 to 2013-Aug-09.44576)." Diameter approximately 0.250 km. from mean, weighted H=20.6.
2013 PG10JPL Sentry15332056-210265.1e-06-6.77-6.880JPL: "Analysis based on 20 observations spanning 7.9348 days (2013-Aug-02.39329 to 2013-Aug-10.32814)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
NEODyS15332048-2112116.05e-07-7.68-7.90NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2013-08-02.394 to 2013-08-10.329."
2012 SG58JPL Sentry2316206013.6e-09-7.36-7.360JPL: "Analysis based on 35 observations spanning 7.8705 days (2012-Sep-26.25925 to 2012-Oct-04.129762)." Diameter approximately 0.083 km. from mean, weighted H=23.1.
2010 YDJPL Sentry0411209118.6e-08-8.12-8.120JPL: "Analysis based on 43 observations spanning 10.136 days (2010-Dec-25.37287 to 2011-Jan-04.50918)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
2008 CE22JPL Sentry1906211322.5e-08-8.66-8.840JPL: "Analysis based on 67 observations spanning 6.6428 days (2008-Feb-09.29929 to 2008-Feb-15.94204)." Diameter approximately 0.018 km. from mean, weighted H=26.4.
1993 UAJPL Sentry1533211113.8e-07-7.00-7.000JPL: "Analysis based on 15 observations spanning 3.0692 days (1993-Oct-21.41449 to 1993-Oct-24.48365)." Diameter approximately 0.028 km. from mean, weighted H=25.4.

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 11 August '13

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

2316Noted that JPL Sentry has posted 2012 SG58 as an impact risk - see above
Grabbed MPEC 2013-P57 - 2013 PD21 - see above
Grabbed MPEC 2013-P58 - 2013 PE21 - see above
Grabbed MPEC 2013-P59 - 2013 PF21 - see above
1906Noted that JPL Sentry has posted 2008 CE22 as an impact risk - see above
1536Generated Traffic Report
1533Noted that JPL Sentry has posted 1993 UA as an impact risk - see above
Noted that JPL Sentry has updated its 2013 PG10 risk assessment - see above
Noted that NEODyS has updated its 2013 PG10 risk assessment - see above
Noted that JPL Sentry has updated its 2013 PV13 risk assessment - see above
Grabbed MPEC 2013-P56 - Daily Orbit Update - see above
0411Noted that JPL Sentry has reposted 2010 YD as an impact risk - see above