Contents  on 4 June '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 4 June '13

One object reported inside ten LD

One visitor is reported flying inside ten lunar distances (LD) of our planet today. 2009 FE comes its closest to Earth on this passage, reaching 9.60 LD at 0505 UT.

This report was generated at 1300 UTC.

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.

Radar Astrometry  on 4 June '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 2327 UTC when the database was dated 4 June

NEOCP Activity  on 4 June '13

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 22 listings on the NEOCP today.

New MPECs  on 4 June '13

Minor Planet Electronic Circulars

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

MPEC 2013-L19 - "20:39 UT" - P/2006 R2 = 2013 L1 (Christensen)

MPEC 2013-L18 - "19:40 UT" - 2013 LF1

MPEC 2013-L17 - "19:38 UT" - 2013 LE1

MPEC 2013-L16 - "19:36 UT" - 2013 LD1

MPEC 2013-L15 - "19:34 UT" - 2013 LC1

MPEC 2013-L14 - "19:31 UT" - 2013 LB1

MPEC 2013-L13 - "16:58 UT" - 2008 JR26

<< DOU on 4 June '13 >>  MPEC 2013-L12 - "06:06 UT" - Daily Orbit Update

Observers  on 4 June '13

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 152756
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2013-L12, 2013-L14 & 2013-L16 -- 2013 LD1, 2013 LB1, 2013 KM6, 2013 KL6, 2013 JT22, 2013 JR28, 2013 JQ22, 2013 JO4, 2013 EU9
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-L12 -- 2013 KN6
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2013-L12 -- 2009 XF2, 85804, 54789, 355256, 210012
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2013-L12, 2013-L13, 2013-L14, 2013-L16, 2013-L17 & 2013-L18 -- 2013 LF1, 2013 LE1, 2013 LD1, 2013 LB1, 2013 LB, 2013 LA, 2013 KN6, 2013 KL6, 2013 KH6, 2013 HV14, 2008 JR26, 6053
K20Danastro Obs., 2 in MPEC 2013-L12 -- 285263, 137199
448Desert Moon Obs. in New Mexico, 1 in MPEC 2013-L14 -- 2013 LB1
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-L12 -- 2013 JB36, 285263
Z81Estrella de Mar Obs., 2 in MPEC 2013-L12 -- 170013, 152756
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-L17 -- 2013 LE1
J95Great Shefford Obs. in England, 1 in MPEC 2013-L14 -- 2013 LB1
J37Huelva Obs. in Spain, 3 in MPEC 2013-L12 -- 2005 JE46, 285263, 1627
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-L17 -- 2013 LE1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-L12 -- 2013 BK18
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-L12 -- 2013 LB
474Mt. John Obs. in New Zealand, 3 in MPECs 2013-L16, 2013-L17 & 2013-L18 -- 2013 LF1, 2013 LE1, 2013 LD1
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-L12, 2013-L14, 2013-L15, 2013-L16, 2013-L17 & 2013-L18 -- 2013 LF1, 2013 LE1, 2013 LD1, 2013 LC1, 2013 LB1, 2013 FD11, 2004 XN50
C23Olmen Obs. in Belgium, 1 in MPEC 2013-L12 -- 285263
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-L12 -- 2013 CU129
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2013-L12 -- 2013 KN6, 2013 JB36, 2009 BL2, 2008 OX2, 285263, 163249
J53Posadas Obs. in Spain, 1 in MPEC 2013-L12 -- 285263
G401program code 1 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-L12 -- 2013 JB36
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2013-L14 & 2013-L19 -- 2013 LB1, P/2013 L1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-L14 -- 2013 LB1
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-L12 -- 163249
I76Tesla Obs. in Spain, 1 in MPEC 2013-L12 -- 2013 JB36
G56Walnut Creek Obs. in northern California, 1 in MPEC 2013-L12 -- 359592
718Wiggins Obs. in Utah, 2 in MPEC 2013-L12 -- 163249, 7888
A79Zvezdno Obshtestvo Obs. in Bulgaria, 1 in MPEC 2013-L14 -- 2013 LB1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 June '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2327 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 LBJPL Sentry1259R E M O V E DJPL: Risk listing removed at 0955 UTC.
NEODyS1259R E M O V E D-

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 4 June '13

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

2327Noted Radar Astrometry database update - see above
2206Grabbed MPEC 2013-L19 - P/2006 R2 = 2013 L1 (Christensen) - see above
2012Grabbed MPEC 2013-L15 - 2013 LC1 - see above
Grabbed MPEC 2013-L16 - 2013 LD1 - see above
Grabbed MPEC 2013-L17 - 2013 LE1 - see above
Grabbed MPEC 2013-L18 - 2013 LF1 - see above
1934Grabbed MPEC 2013-L14 - 2013 LB1 - see above
1712Grabbed MPEC 2013-L13 - 2008 JR26 - see above
1300Generated Traffic Report
1259Noted that JPL Sentry has removed 2013 LB as an impact risk - see above
Noted that NEODyS has removed 2013 LB as an impact risk - see above
Grabbed MPEC 2013-L12 - Daily Orbit Update - see above