Contents  on 12 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 12 December '13

Two objects reported inside ten LD

There are two objects reported passing inside ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, radar target 2013 XY8 (no longer risk listed) is outbound from 2.25 to 3.68 LD. And, further away, 2013 XH17 is headed out from 7.44 to 8.41 LD.

This report was generated at 1910 UTC to note follow-up in today's DOU MPEC for 2013 XY8 and three departed objects: radar target 2013 NJ and risk-listed 2013 WZ44 and 2013 WX44.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 12 December '13

The MPC's NEO Confirmation Page has 35 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 35 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 39 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 12 December '13

Minor Planet Electronic Circulars

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


MPEC 2013-X60 - "22:01 UT" - 2013 XV18


MPEC 2013-X59 - "18:53 UT" - Comet P/2013 TL117 (Lemmon)


<< DOU on 12 Dec. '13 >>  MPEC 2013-X58 - "14:03 UT" - Daily Orbit Update


MPEC 2013-X57 - "13:43 UT" - 2012 LG11

Observers  on 12 December '13

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2013-X58, 2013-X59 & 2013-X60 -- 2013 XX8, 2013 XW3, 2013 XV18, 2013 XS3, 2013 XH10, 2013 WW44, 2013 WV45, 2013 WL, 2013 UR3, P/2013 TL117, 22771
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-X58 -- 2013 WT45
Q68Blue Mountains Obs. in New South Wales, 3 in MPECs 2013-X58 & 2013-X59 -- P/2013 TL117, 2013 TL117, 2013 NJ
C85Cala d'Hort Obs., 1 in MPEC 2013-X58 -- 2013 XV8
160Castelmartini Obs. in Italy, 6 in MPEC 2013-X58 -- 2013 UR3, 2010 XZ67, 2010 CL19, 251346, 215188, 138095
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2013-X58 & 2013-X59 -- P/2013 TL117, 55532, 279744, 16834, 137099
K51Celado Obs., 2 in MPEC 2013-X58 -- 2013 NJ, 162004
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPEC 2013-X58 -- 2013 XY9, 2013 QG17, 2012 TS, 2010 WP8, 2008 KZ5, 2002 MS3, 243566, 241596, 163691, 163023, 153311, 153201, 137084, 3271
K20Danastro Obs., 1 in MPEC 2013-X58 -- 2013 XY8
448Desert Moon Obs. in New Mexico, 8 in MPECs 2013-X58 & 2013-X59 -- P/2013 TL117, 2013 NJ, 2010 SL13, 2009 WZ104, 68031, 34613, 162566, 155140
113Drebach Obs. in Germany, 1 in MPEC 2013-X59 -- P/2013 TL117
130Lumezzane Obs. in Italy, 1 in MPEC 2013-X59 -- P/2013 TL117
D54MASTER-II Obs. Blagoveshchensk in Russia, 1 in MPEC 2013-X58 -- 52760
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2013-X58 -- 137062
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2013-X59 & 2013-X60 -- 2013 XV18, P/2013 TL117
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2013-X57 & 2013-X58 -- 2013 WZ44, 2013 WX44, 2013 WA44, 2012 LG11
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-X59 -- P/2013 TL117
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-X58, 2013-X59 & 2013-X60 -- 2013 XV18, 2013 WS43, P/2013 TL117
A24New Millennium Obs. in Italy, 8 in MPEC 2013-X58 -- 2010 XZ67, 55532, 52760, 251346, 21088, 16834, 162566, 9950
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 5 in MPEC 2013-X58 -- 2013 XY8, 2013 NJ, 2010 SL13, 2010 CL19, 251346
583Odessa-Mayaki Obs. in the Ukraine, 1 in MPEC 2013-X58 -- 2013 TV135
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-X59 -- P/2013 TL117
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-X59 -- P/2013 TL117
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-X58 & 2013-X59 -- 2013 XG17, P/2013 TL117, 2011 BO24, 2009 QD34, 370688, 20460
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPECs 2013-X58 & 2013-X59 -- P/2013 TL117, 2005 RQ6, 334673, 163679
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-X58 -- 2013 XG17
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-X60 -- 2013 XV18
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-X58 -- 2013 XY8
204Schiaparelli Obs. in Italy, 2 in MPECs 2013-X59 & 2013-X60 -- 2013 XV18, P/2013 TL117
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2013-X59 & 2013-X60 -- 2013 XV18, P/2013 TL117
A84TUBITAK Natl. Obs. in Turkey, 1 in MPEC 2013-X58 -- 1866
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-X58 -- 55532
2904Carl Hergenrother via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2013-X59 -- P/2013 TL117
I42Westport Obs. in Massachusetts, 1 in MPEC 2013-X59 -- P/2013 TL117
718Wiggins Obs. in Utah, 1 in MPEC 2013-X58 -- 2013 XY8
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2013-X59 -- P/2013 TL117
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-X59 -- P/2013 TL117
I89%program code "%" (14) via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2013-X58 -- 2013 XY8
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-X59 -- P/2013 TL117
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 XY8NEODyS1604R E M O V E D-
2013 WZ44JPL Sentry1902211111.0e-06-6.59-6.590JPL: "Analysis based on 38 observations spanning 12.087 days (2013-Nov-28.411 to 2013-Dec-10.497931)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
NEODyS16092111-211122.21e-06-6.25-6.250NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2013-11-28.412 to 2013-12-10.499."
2013 WX44JPL Sentry1604207117.5e-08-7.53-7.530JPL: "Analysis based on 30 observations spanning 13.079 days (2013-Nov-27.50384 to 2013-Dec-10.582939)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS1604R E M O V E D-
2005 TM173JPL Sentry04052013-21101288.6e-07-5.14-5.470JPL: "Analysis based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743)." Diameter approximately 0.051 km. from mean, weighted H=24.1.

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 12 December '13

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

2220Grabbed MPEC 2013-X60 - 2013 XV18 - see above
1910Generated Traffic Report
1902Noted that JPL Sentry has updated its 2013 WZ44 risk assessment - see above
Grabbed MPEC 2013-X59 - Comet P/2013 TL117 (Lemmon) - see above
1609Noted that NEODyS has updated its 2013 WZ44 risk assessment - see above
1607Grabbed MPEC 2013-X57 - 2012 LG11 - see above
Grabbed MPEC 2013-X58 - Daily Orbit Update - see above
1604Noted that JPL Sentry has updated its 2013 WX44 risk assessment - see above
Noted that NEODyS has removed 2013 WX44 as an impact risk - see above
Noted that NEODyS has removed 2013 XY8 as an impact risk - see above
0405Noted that JPL Sentry has updated its 2005 TM173 risk assessment - see above