Contents  on 8 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 8 December '13

One object reported inside ten LD

One asteroid is reported to be inside ten lunar distances (LD) of our planet today. Newly announced risk-listed 2013 XY8 is inbound from 7.31 to 5.39 LD.

This report was generated at 1750 UTC with new discovery 2013 XY8 (MPEC) and follow-up in today's DOU MPEC for two departed objects: risk-listed 2013 VW13 and 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.

NEOCP Activity  on 8 December '13

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 41 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 8 December '13

Minor Planet Electronic Circulars

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


<< DOU on 8 Dec. '13 >>  MPEC 2013-X45 - "17:33 UT" - Daily Orbit Update


MPEC 2013-X44 - "12:22 UT" - 2013 XY8


MPEC 2013-X43 - "12:16 UT" - 2013 XX8


MPEC 2013-X42 - "12:03 UT" - 2013 XW8


MPEC 2013-X41 - "11:58 UT" - 2013 XV8


MPEC 2013-X40 - "11:51 UT" - 2013 WF108

Observers  on 8 December '13

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2013-X41, 2013-X42, 2013-X43, 2013-X44 & 2013-X45 -- 2013 XY8, 2013 XX8, 2013 XW8, 2013 XV8, 2013 XH4, 2013 XA4, 2013 WY67, 2013 VV4, 2013 UR5, 2013 TH5, 2013 NJ, 2009 BP58, 2009 BJ81, 2006 YF, 2003 SJ215, 2003 GY, 2000 AG205
I99Blanquita Obs. in Spain, 2 in MPEC 2013-X45 -- 2010 SL13, 361071
C85Cala d'Hort Obs., 1 in MPEC 2013-X41 -- 2013 XV8
160Castelmartini Obs. in Italy, 10 in MPEC 2013-X45 -- 2012 ER14, 2008 TQ2, 85774, 378610, 377097, 376729, 363305, 360433, 279744, 249595
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2013-X44 & 2013-X45 -- 2013 XY8, 2013 VD13, 2010 CL19, 39565
958Dax Obs. in France, 3 in MPECs 2013-X42, 2013-X43 & 2013-X44 -- 2013 XY8, 2013 XX8, 2013 XW8
448Desert Moon Obs. in New Mexico, 2 in MPEC 2013-X45 -- 2013 XA4, 2009 YO
J27El Guijo Obs. in Spain, 4 in MPEC 2013-X45 -- 85839, 55532, 53435, 249595
Z81Estrella de Mar Obs., 1 in MPEC 2013-X45 -- 2013 WT45
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2013-X41, 2013-X42 & 2013-X45 -- 2013 XW8, 2013 XV8, 2013 XA4, 85182
J87La Canada Obs. in Spain, 1 in MPEC 2013-X45 -- 2013 XA4
809:program code ":" via La Silla in Chile, 1 in MPEC 2013-X45 -- 88710
K38M57 Obs., 1 in MPEC 2013-X44 -- 2013 XY8
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2013-X45 -- 2005 RQ6
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-X42 -- 2013 XW8
A06Mataro Obs. in Spain, 2 in MPEC 2013-X45 -- 2013 TB80, 2010 CL19
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-X45 -- 2013 VW13
568=program code "=" on Mauna Kea in Hawaii, 1 in MPEC 2013-X40 -- 2013 WF108
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-X40 -- 2013 WF108
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-X43 -- 2013 XX8
A24New Millennium Obs. in Italy, 1 in MPEC 2013-X44 -- 2013 XY8
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2013-X40, 2013-X42 & 2013-X45 -- 2013 XW8, 2013 WT45, 2013 WF108, 2013 VC10, 2013 TE6, 2012 AS10, 2011 BO24, 376729, 153271
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2013-X45 -- 2013 VD13, 17511
K33San Defendente Obs., 1 in MPEC 2013-X44 -- 2013 XY8
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-X41, 2013-X42 & 2013-X44 -- 2013 XY8, 2013 XW8, 2013 XV8
589Santa Lucia Stroncone Obs. in Italy, 1 in MPEC 2013-X45 -- 2013 NJ
204Schiaparelli Obs. in Italy, 3 in MPECs 2013-X43, 2013-X44 & 2013-X45 -- 2013 XY8, 2013 XX8, 2013 TL117
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-X41 -- 2013 XV8
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-X43 & 2013-X44 -- 2013 XY8, 2013 XX8
926Tenagra II Obs. in Arizona, 2 in MPECs 2013-X43 & 2013-X44 -- 2013 XY8, 2013 XX8
2904Carl Hergenrother via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2013-X44 -- 2013 XY8
I45W Crucis Obs. in Argentina, 1 in MPEC 2013-X45 -- 363305
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-X45 -- 2013 TL117
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 XY8JPL Sentry16472091-210741.8e-04-3.88-3.880JPL: "Analysis based on 52 observations spanning 1.0128 days (2013-Dec-07.17005 to 2013-Dec-08.18289)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2013 XF4NEODyS16472096-209613.66e-08-8.09-8.090NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2013-12-03.287 to 2013-12-07.357."
2013 WR67NEODyS1647R E M O V E D-
2013 WT43NEODyS1647R E M O V E D-
2013 WMNEODyS16472047-210521.38e-06-4.65-4.690NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2013-11-25.247 to 2013-12-07.200."
2013 VD17NEODyS16472065-207528.91e-07-7.12-7.310NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2013-11-14.243 to 2013-12-03.530."
2013 VW13JPL Sentry21232076-209772.6e-04-4.17-4.340JPL: "Analysis based on 34 observations spanning 21.285 days (2013-Nov-12.17353 to 2013-Dec-03.458706)." Diameter approximately 0.019 km. from mean, weighted H=26.2.
2013 VJ13NEODyS16472099-209928.63e-07-5.57-5.760NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2013-11-10.136 to 2013-12-07.240."

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 8 December '13

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

2123Noted that JPL Sentry has updated its 2013 VW13 risk assessment - see above
1750Grabbed MPEC 2013-X45 - Daily Orbit Update - see above
Generated Traffic Report
1647Noted that NEODyS has updated its 2013 VD17 risk assessment - see above
Noted that NEODyS has updated its 2013 VJ13 risk assessment - see above
Noted that NEODyS has updated its 2013 WM risk assessment - see above
Noted that NEODyS has removed 2013 WR67 as an impact risk - see above
Noted that NEODyS has removed 2013 WT43 as an impact risk - see above
Noted that NEODyS has posted 2013 XF4 as an impact risk - see above
Noted that JPL Sentry has posted 2013 XY8 as an impact risk - see above
Grabbed MPEC 2013-X40 - 2013 WF108 - see above
Grabbed MPEC 2013-X41 - 2013 XV8 - see above
Grabbed MPEC 2013-X42 - 2013 XW8 - see above
Grabbed MPEC 2013-X43 - 2013 XX8 - see above
Grabbed MPEC 2013-X44 - 2013 XY8 - see above