Contents  on 20 March '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 20 March '13

Five objects reported inside ten LD

Five asteroids are reported to be within ten lunar distances (LD) of Earth today. Risk-listed radar target 2007 EO88, which hasn't been reported observed on this passage, is headed out from 5.2 to 6.8 LD*. Also outbound is 2013 ED68, from 5.92 to 7.36 LD, and radar target intruder 2013 EC20, from 7.01 to 7.64 LD, while 2013 ES11 is inbound from 9.36 to 7.76 LD and 2013 FG from 9.7 to 7.8 LD*.

Next known to be coming around are two newly announced objects with some uncertainty in timing -- 2013 FD8 arriving inside ten LD on March 24th and 2013 FB8 on March 25th, which is the day risk-listed 2013 EL89 also arrives.

This report was updated at 2235 UTC with new discoveries 2013 FD8 (MPEC) and 2013 FB8 (MPEC). Today's first traffic report was generated at 1310 UTC with first follow-up for departed risk-listed 2013 FK in today's DOU MPEC along with follow-up for 2013 EL89, 2013 ED68, and 2013 ES11, plus departed 2013 EQ41.



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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 20 March '13

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1934 UTC when the database was dated 20 March

NEOCP Activity  on 20 March '13

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, eleven were "one nighters." So far The Tracking News has counted a total of 36 listings on the NEOCP today.

New MPECs  on 20 March '13

Minor Planet Electronic Circulars

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


MPEC 2013-F36 - "17:15 UT" - 2013 FD8


MPEC 2013-F35 - "17:12 UT" - 2013 FC8


MPEC 2013-F34 - "17:08 UT" - 2013 FB8


MPEC 2013-F33 - "17:05 UT" - 2013 FA8


MPEC 2013-F32 - "17:01 UT" - 2013 FZ7


MPEC 2013-F31 - "16:58 UT" - 2013 FY7


MPEC 2013-F30 - "16:54 UT" - 2013 FX7


MPEC 2013-F29 - "16:51 UT" - 2013 EO126


MPEC 2013-F28 - "16:47 UT" - 2013 EN126


MPEC 2013-F27 - "15:49 UT" - 1999 GR6


<< DOU on 20 Mar. '13 >>  MPEC 2013-F26 - "06:07 UT" - Daily Orbit Update

Observers  on 20 March '13

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 3 in MPECs 2013-F28, 2013-F29 & 2013-F34 -- 2013 FB8, 2013 EO126, 2013 EN126
E23Arcadia Obs. in New South Wales, 2 in MPECs 2013-F30 & 2013-F33 -- 2013 FX7, 2013 FA8
251Arecibo in Puerto Rico, 1 in radar -- 2008 SE85
H21Astronomical Research Obs. Westfield in Illinois, 27 in MPECs 2013-F26, 2013-F28, 2013-F29, 2013-F31, 2013-F32, 2013-F33, 2013-F34, 2013-F35 & 2013-F36 -- 2013 FZ7, 2013 FY7, 2013 FD8, 2013 FC8, 2013 FB8, 2013 FA8, 2013 EW27, 2013 EV89, 2013 ER89, 2013 ER41, 2013 EQ4, 2013 EO126, 2013 EN126, 2013 EL89, 2013 EK89, 2013 EH89, 2013 EH68, 2013 EC28, 2013 EA, 2013 DR9, 2013 CU129, 2013 CN128, 2013 AM60, 2012 VO6, 2011 BK24, 2009 SC15, 4179
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-F26 -- 2009 UM3, 2009 SC15
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-F33 -- 2013 FA8
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2013-F26, 2013-F34 & 2013-F35 -- 2013 FC8, 2013 FB8, 153267
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2013-F28, 2013-F29, 2013-F30 & 2013-F32 -- 2013 FZ7, 2013 FX7, 2013 EO126, 2013 EN126
I51Clinton Obs., 1 in MPEC 2013-F26 -- 11405
958Dax Obs. in France, 1 in MPEC 2013-F33 -- 2013 FA8
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-F26 -- 139289
D05ISON-Terskol Obs., 1 in MPEC 2013-F33 -- 2013 FA8
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2013-F30 & 2013-F31 -- 2013 FY7, 2013 FX7
711McDonald Obs. in Texas, 2 in MPECs 2013-F29 & 2013-F33 -- 2013 FA8, 2013 EO126
118Modra Obs. in Slovakia, 1 in MPEC 2013-F35 -- 2013 FC8
900Moriyama Obs. in Japan, 2 in MPEC 2013-F26 -- 2013 ED68, 2005 ES70
474Mt. John Obs. in New Zealand, 1 in MPEC 2013-F30 -- 2013 FX7
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-F26, 2013-F29, 2013-F31, 2013-F33 & 2013-F35 -- 2013 FY7, 2013 FC8, 2013 FA8, 2013 EO126, 190161, 2329
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-F26 -- 226514
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-F26 -- 27346
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2013-F26, 2013-F27, 2013-F28, 2013-F29 & 2013-F36 -- 2013 FD8, 2013 EV89, 2013 EQ41, 2013 EO126, 2013 EN126, 2012 TJ146, 2009 HU2, 1999 GR6, 99935, 54686, 332446, 277810, 1917, 1864
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2013-F26 -- 2013 ES11, 2013 EP89, 2013 EA, 2009 UM3, 2009 SC15, 2005 EM30, 2001 TA2, 1999 HA2
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-F26 -- 2329
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2013-F26 & 2013-F30 -- 2013 FX7, 2013 FK, 2013 ES11
H36Sandlot Obs. in Kansas, 7 in MPECs 2013-F26, 2013-F31, 2013-F32, 2013-F33, 2013-F34, 2013-F35 & 2013-F36 -- 2013 FZ7, 2013 FY7, 2013 FD8, 2013 FC8, 2013 FB8, 2013 FA8, 2013 EN89
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2013-F26 -- 3554
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-F30 -- 2013 FX7
691Spacewatch 0.9m telescope in Arizona, 11 in MPECs 2013-F26, 2013-F27, 2013-F29, 2013-F32 & 2013-F33 -- 2013 FZ7, 2013 FA8, 2013 ES, 2013 EO126, 2012 QC8, 1999 GR6, 350988, 216689, 8567, 6050, 719
291Spacewatch 1.8m telescope in Arizona, 25 in MPECs 2013-F26, 2013-F28, 2013-F31, 2013-F32, 2013-F33, 2013-F34, 2013-F35 & 2013-F36 -- 2013 FZ7, 2013 FY7, 2013 FD8, 2013 FC8, 2013 FB8, 2013 FA8, 2013 EV108, 2013 ES89, 2013 EP41, 2013 EN89, 2013 EN126, 2013 EM20, 2013 EL89, 2013 EL28, 2013 EK28, 2013 EJ89, 2013 EH68, 2013 DL1, 2013 CX129, 2013 CU82, 2013 CL118, 2013 BF27, 2013 BE74, 2010 RM42, 2000 JF1
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-F26 -- 2009 UM3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 March '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.
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
2013 FKNEODyS1303R E M O V E D-
JPL Sentry13032087-209447.4e-07-5.57-5.990JPL: "Analysis based on 15 observations spanning 1.9484 days (2013-Mar-17.73917 to 2013-Mar-19.687593)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
2013 EV108NEODyS1303R E M O V E D-
JPL Sentry1303207814.8e-09-6.23-6.230JPL: "Analysis based on 32 observations spanning 10.822 days (2013-Mar-09.38736 to 2013-Mar-20.20962)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
2013 EL89JPL Sentry1303209212.8e-10-10.27-10.30JPL: "Analysis based on 30 observations spanning 5.8876 days (2013-Mar-14.25151 to 2013-Mar-20.1391)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
NEODyS13032092-211024.61e-09-9.06-9.170NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2013-03-14.252 to 2013-03-20.140."
2013 EH68JPL Sentry1303210518.3e-09-7.06-7.060JPL: "Analysis based on 46 observations spanning 5.8597 days (2013-Mar-13.46782 to 2013-Mar-19.327513)." Diameter approximately 0.087 km. from mean, weighted H=23.0.
NEODyS13032095-209524.22e-08-6.27-6.320NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-19.328."

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 20 March '13

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

2235Updated Traffic Report
1934Noted Radar Astrometry database update - see above
1800Grabbed MPEC 2013-F28 - 2013 EN126 - see above
Grabbed MPEC 2013-F29 - 2013 EO126 - see above
Grabbed MPEC 2013-F30 - 2013 FX7 - see above
Grabbed MPEC 2013-F31 - 2013 FY7 - see above
Grabbed MPEC 2013-F32 - 2013 FZ7 - see above
Grabbed MPEC 2013-F33 - 2013 FA8 - see above
Grabbed MPEC 2013-F34 - 2013 FB8 - see above
Grabbed MPEC 2013-F35 - 2013 FC8 - see above
Grabbed MPEC 2013-F36 - 2013 FD8 - see above
1613Grabbed MPEC 2013-F27 - 1999 GR6 - see above
1303Noted that JPL Sentry has updated its 2013 EH68 risk assessment - see above
Noted that NEODyS has updated its 2013 EH68 risk assessment - see above
Noted that JPL Sentry has updated its 2013 EL89 risk assessment - see above
Noted that NEODyS has updated its 2013 EL89 risk assessment - see above
Noted that JPL Sentry has updated its 2013 EV108 risk assessment - see above
Noted that NEODyS has removed 2013 EV108 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 FK risk assessment - see above
Noted that NEODyS has removed 2013 FK as an impact risk - see above
Grabbed MPEC 2013-F26 - Daily Orbit Update - see above