Contents  on 17 May '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 17 May '13

One object reported inside ten LD

There is one asteroid reported inside a radius of ten lunar distances (LD) from Earth today. Risk-listed 2013 JM22 leaves ten LD, moving from 8.34 to 12.17 LD. Next known to be approaching is 2009 FE, which arrives inside ten LD on June 2nd.

This report was generated at 1408 UTC. The Minor Planet Center is reporting that a power disruption has caused "major problems" to their computers, and no DOU MPEC has been posted today.

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 17 May '13

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2227 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, 25 were "one nighters." The Tracking News counted a total of 64 listings on the NEOCP on this day.

New MPECs  on 17 May '13

Minor Planet Electronic Circulars

There were ten MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-K11 - "22:37 UT" - 2013 KA

MPEC 2013-K10 - "22:35 UT" - 2013 KB

MPEC 2013-K09 - "22:31 UT" - 2013 JE34

MPEC 2013-K08 - "22:27 UT" - 2013 JD34

MPEC 2013-K07 - "21:42 UT" - 2013 JX28

MPEC 2013-K06 - "21:38 UT" - 2013 JW28

MPEC 2013-K05 - "20:20 UT" - 2013 JG29

MPEC 2013-K04 - "20:17 UT" - 2013 JE29

MPEC 2013-K03 - "20:12 UT" - 2013 JA29

MPEC 2013-K02 - "20:06 UT" - 2013 JZ28

Observers  on 17 May '13

Twelve observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-K02, 2013-K06 & 2013-K07 -- 2013 JZ28, 2013 JX28, 2013 JW28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-K03 & 2013-K05 -- 2013 JG29, 2013 JA29
J95Great Shefford Obs. in England, 2 in MPECs 2013-K09 & 2013-K11 -- 2013 KA, 2013 JE34
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-K05 -- 2013 JG29
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-K09 -- 2013 JE34
K93LCOGT Sutherland C in South Africa, 3 in MPECs 2013-K03, 2013-K04 & 2013-K08 -- 2013 JE29, 2013 JD34, 2013 JA29
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2013-K02, 2013-K08, 2013-K09 & 2013-K10 -- 2013 KB, 2013 JZ28, 2013 JE34, 2013 JD34
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2013-K02, 2013-K03, 2013-K06 & 2013-K07 -- 2013 JZ28, 2013 JX28, 2013 JW28, 2013 JA29
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-K04, 2013-K08, 2013-K10 & 2013-K11 -- 2013 KB, 2013 KA, 2013 JE29, 2013 JD34
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-K02, 2013-K03, 2013-K05, 2013-K06, 2013-K07 & 2013-K09 -- 2013 JZ28, 2013 JX28, 2013 JW28, 2013 JG29, 2013 JE34, 2013 JA29
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-K07 & 2013-K11 -- 2013 KA, 2013 JX28
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2013-K02, 2013-K03, 2013-K04, 2013-K05, 2013-K07 & 2013-K09 -- 2013 JZ28, 2013 JX28, 2013 JG29, 2013 JE34, 2013 JE29, 2013 JA29
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 May '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2227 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 JD34JPL Sentry2359205813.8e-10-9.19-9.190JPL: "Analysis based on 16 observations spanning 1.9279 days (2013-May-15.3829 to 2013-May-17.31075)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
2013 JM22JPL Sentry2031209513.2e-09-7.40-7.400JPL: "Analysis based on 64 observations spanning 3.7723 days (2013-May-12.34486 to 2013-May-16.117174)." Diameter approximately 0.077 km. from mean, weighted H=23.2.

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 17 May '13

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

2359Noted that JPL Sentry has posted 2013 JD34 as an impact risk - see above
Grabbed MPEC 2013-K08 - 2013 JD34 - see above
Grabbed MPEC 2013-K09 - 2013 JE34 - see above
Grabbed MPEC 2013-K10 - 2013 KB - see above
Grabbed MPEC 2013-K11 - 2013 KA - see above
2227Grabbed MPEC 2013-K06 - 2013 JW28 - see above
Grabbed MPEC 2013-K07 - 2013 JX28 - see above
2031Noted that JPL Sentry has updated its 2013 JM22 risk assessment - see above
2030Grabbed MPEC 2013-K02 - 2013 JZ28 - see above
Grabbed MPEC 2013-K03 - 2013 JA29 - see above
Grabbed MPEC 2013-K04 - 2013 JE29 - see above
Grabbed MPEC 2013-K05 - 2013 JG29 - see above
1408Generated Traffic Report