Contents  on 16 December '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 16 December '13

Three objects reported inside ten LD

There are three asteroids reported to be within a radius of ten lunar distances (LD) from Earth today. Risk-listed intruder 2013 XS21 is outbound from 6.91 to 8.61 LD, 2013 XU21 from 7.33 to 8.87 LD, and radar target 2013 XY8 leaves ten LD, moving from 9.39 to 11.37 LD.

This report was generated at 1441 UTC with follow-up in today's DOU MPEC for 2013 XY8 and departed radar target 2013 NJ.



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 16 December '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 2359 UTC when the database was dated 16 Dec.

NEOCP Activity  on 16 December '13

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 29 listings on the NEOCP today.

New MPECs  on 16 December '13

Minor Planet Electronic Circulars

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


MPEC 2013-Y07 - "23:20 UT" - 2013 XK22


MPEC 2013-Y06 - "23:13 UT" - 2013 XJ22


MPEC 2013-Y05 - "23:07 UT" - 2013 XH22


MPEC 2013-Y04 - "23:01 UT" - 2013 XG22


MPEC 2013-Y03 - "22:54 UT" - 2013 XF22


MPEC 2013-Y02 - "22:28 UT" - 2013 XE22


<< DOU on 16 Dec. '13 >>  MPEC 2013-Y01 - "14:04 UT" - Daily Orbit Update

Observers  on 16 December '13

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

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2013 XA4
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2013-Y01, 2013-Y03 & 2013-Y04 -- 2013 XX8, 2013 XH4, 2013 XH10, 2013 XG22, 2013 XF22, 2013 WV45, 2013 OM9
160Castelmartini Obs. in Italy, 3 in MPECs 2013-Y04, 2013-Y05 & 2013-Y07 -- 2013 XK22, 2013 XH22, 2013 XG22
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2013-Y04 & 2013-Y07 -- 2013 XK22, 2013 XG22
K51Celado Obs., 1 in MPEC 2013-Y04 -- 2013 XG22
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-Y04 -- 2013 XG22
958Dax Obs. in France, 3 in MPECs 2013-Y04, 2013-Y05 & 2013-Y07 -- 2013 XK22, 2013 XH22, 2013 XG22
448Desert Moon Obs. in New Mexico, 8 in MPECs 2013-Y01, 2013-Y03, 2013-Y04, 2013-Y05 & 2013-Y07 -- 2013 XK22, 2013 XH22, 2013 XG22, 2013 XF22, 2013 UR3, 2013 TH5, 2008 XP2, 142464
203GiaGa Obs. in Italy, 2 in MPECs 2013-Y04 & 2013-Y05 -- 2013 XH22, 2013 XG22
J95Great Shefford Obs. in England, 2 in MPECs 2013-Y04 & 2013-Y05 -- 2013 XH22, 2013 XG22
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2013-Y02, 2013-Y04, 2013-Y05, 2013-Y06 & 2013-Y07 -- 2013 XK22, 2013 XJ22, 2013 XH22, 2013 XG22, 2013 XE22
C91Montevenere Obs., 1 in MPEC 2013-Y01 -- 251346
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-Y04, 2013-Y05 & 2013-Y06 -- 2013 XJ22, 2013 XH22, 2013 XG22
A24New Millennium Obs. in Italy, 8 in MPEC 2013-Y01 -- 2010 XZ67, 55532, 251346, 21088, 16834, 162566, 138095, 9950
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2013-Y01, 2013-Y02 & 2013-Y03 -- 2013 XF22, 2013 XE22, 2013 NJ, 2006 AL3, 85839, 366733, 185851, 152756, 138205
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2013-Y01 -- 2013 UR3, 2010 XZ67, 21088
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-Y01 -- 7753
204Schiaparelli Obs. in Italy, 17 in MPECs 2013-Y01 & 2013-Y07 -- 2013 XY8, 2013 XK22, 2013 VV4, 2013 VO5, 2013 VM2, 2013 VJ2, 2013 UR3, 2013 TC136, 2013 TB80, 2013 MH7, 2012 AS10, 2011 BO24, 2010 XZ67, 2008 WK32, 2008 VN, 2006 AL3, 2003 WX25
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-Y02 -- 2013 XE22
A84TUBITAK Natl. Obs. in Turkey, 1 in MPEC 2013-Y01 -- 1627
926Tenagra II Obs. in Arizona, 4 in MPECs 2013-Y01, 2013-Y03 & 2013-Y04 -- 2013 XG22, 2013 XG17, 2013 XF22, 2013 UR3
G33Wickede Obs. in Germany, 1 in MPEC 2013-Y01 -- 2013 XY8
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2013-Y01 -- 2013 UR3, 2013 TB80, 251346, 163696, 138095
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-Y07 -- 2013 XK22
I89%program code "%" (14) via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2013-Y01 -- 12711
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 December '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 NE24NEODyS17512046-2112165.74e-06-6.60-6.830NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2013-07-14.491 to 2013-07-15.496."

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 16 December '13

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

2359Grabbed MPEC 2013-Y07 - 2013 XK22 - see above
Noted Radar Astrometry database update - see above
2320Grabbed MPEC 2013-Y02 - 2013 XE22 - see above
Grabbed MPEC 2013-Y03 - 2013 XF22 - see above
Grabbed MPEC 2013-Y04 - 2013 XG22 - see above
Grabbed MPEC 2013-Y05 - 2013 XH22 - see above
Grabbed MPEC 2013-Y06 - 2013 XJ22 - see above
1751Noted that NEODyS has reposted 2013 NE24 as an impact risk - see above
1441Generated Traffic Report
1430Grabbed MPEC 2013-Y01 - Daily Orbit Update - see above