Contents  on 15 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 15 December '13

Four objects reported inside ten LD

Four objects are reported flying within ten lunar distances (LD) of Earth today, all headed away. Risk-listed intruder 2013 XS21 is outbound from 5.20 to 6.91 LD, 2013 XU21 from 6.35 to 7.33 LD, radar target 2013 XY8 from 7.42 to 9.39 LD, and 2013 XT21 leaves ten LD, traveling from 9.20 to 12.22 LD.

This report was generated at 1657 UTC with follow-up in today's DOU MPEC for 2013 XU21, which is no longer risk listed.



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 15 December '13

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 28 listings on the NEOCP today.

New MPECs  on 15 December '13

Minor Planet Electronic Circulars

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


<< DOU on 15 Dec. '13 >>  MPEC 2013-X77 - "14:03 UT" - Daily Orbit Update


MPEC 2013-X76 - "13:37 UT" - 2013 XA22


MPEC 2013-X75 - "13:31 UT" - 2013 XZ21


MPEC 2013-X74 - "13:16 UT" - 2013 XY21


<< OOC on 15 Dec. '13 >> MPEC 2013-X73 - "06:28 UT" - Observations and Orbits of Comets

Observers  on 15 December '13

A total of 65 observers appear in today's MPECs.

CodeObserver / observatory
J24Altamira Obs. in the Canary Islands, 2 in MPEC 2013-X73 -- 293P, 52P
Z74Amanecer de Arrakis Obs., 2 in MPEC 2013-X73 -- C/2011 J2, 154P
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2013-X75, 2013-X76 & 2013-X77 -- 2013 XZ9, 2013 XZ21, 2013 XA22, 2010 XZ67, 2008 WK32, 20460, 162566, 153201
B75Betelgeuse Station in Italy, 6 in MPEC 2013-X73 -- C/2013 V3, C/2013 E2, C/2012 K1, C/2012 F6, C/2011 L4, C/2010 S1
C86Blanes Obs. in Spain, 1 in MPEC 2013-X73 -- C/2013 R1
Q68Blue Mountains Obs. in New South Wales, 5 in MPEC 2013-X73 -- C/2013 V1, C/2013 A1, C/2011 O1, C/2009 F4, 292P
B59Borken Obs. in Germany, 1 in MPEC 2013-X73 -- 154P
215Buchloe Obs. in Germany, 6 in MPEC 2013-X73 -- C/2013 V3, C/2013 R1, C/2012 X1, C/2012 F6, C/2010 S1, 4P
W96Campo Catino Austral Obs. (CAO) in Chile, 8 in MPEC 2013-X73 -- C/2013 V5, C/2013 V1, C/2013 N4, C/2013 A1, 98P, 32P, 29P, 17P
B20Carmelita Obs. in Spain, 1 in MPEC 2013-X73 -- 290P
I72Carpe Noctem Obs., 12 in MPEC 2013-X73 -- C/2013 V4, C/2013 V3, C/2013 V2, C/2013 U2, C/2013 R1, C/2012 X1, C/2012 F6, C/2011 J2, 291P, 184P, 154P, 52P
160Castelmartini Obs. in Italy, 9 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, C/2013 V1, C/2010 S1, 290P, 154P, 124P, 119P, 84P
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2013-X73 & 2013-X75 -- 2013 XZ21, C/2013 V1, C/2012 A2, 293P, 269P, 209P, 184P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPEC 2013-X77 -- 2013 XV8, 2013 VV4, 2013 VF13, 2013 VC10, 36236, 307070, 285838, 283729, 276468, 138883, 8566, 4055, 2102
A77Chante-Perdrix Obs. in France, 11 in MPEC 2013-X73 -- C/2013 V3, C/2013 V1, C/2013 R1, C/2012 X1, C/2012 S4, 290P, 257P, 242P, 154P, 119P, 52P
B92Chinon Obs. in France, 5 in MPEC 2013-X73 -- C/2013 V3, C/2013 R1, C/2012 X1, 290P, 154P
J01Cielo Profundo Obs. in Spain, 7 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, C/2013 V1, C/2013 R1, C/2012 X1, 290P, 124P
B50Corner Obs. in Germany, 1 in MPEC 2013-X73 -- 290P
K20Danastro Obs., 3 in MPEC 2013-X73 -- C/2013 V2, C/2013 R1, 290P
958Dax Obs. in France, 1 in MPEC 2013-X75 -- 2013 XZ21
448Desert Moon Obs. in New Mexico, 1 in MPEC 2013-X77 -- 2010 GY6
J27El Guijo Obs. in Spain, 2 in MPEC 2013-X73 -- C/2013 V2, 84P
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-X75 -- 2013 XZ21
F65)program code ")" (18) via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-X73 -- 209P
372Geisei Obs. in Japan, 7 in MPEC 2013-X73 -- C/2013 X1, C/2013 W2, C/2013 P3, C/2013 E2, C/2012 S1, C/2011 UF305, 260P
B83Gieres Obs. in France, 5 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, 291P, 290P, 154P
J95Great Shefford Obs. in England, 2 in MPECs 2013-X75 & 2013-X76 -- 2013 XZ21, 2013 XA22
458Guadarrama Obs. in Spain, 1 in MPEC 2013-X73 -- 290P
K25Haute Provence Sud Obs., 3 in MPEC 2013-X73 -- P/2013 W1, C/2013 U2, 158P
D95Kurihara Obs. in Japan, 4 in MPEC 2013-X73 -- C/2013 R1, C/2012 X1, C/2012 K1, 134P
J38La Vara Obs. in Spain, 10 in MPEC 2013-X73 -- C/2013 V3, C/2013 V1, C/2013 R1, C/2012 F6, C/2010 S1, C/2009 F4, 290P, 154P, 119P, 4P
844Los Molinos Obs. in Uruguay, 1 in MPEC 2013-X73 -- C/2013 V1
130Lumezzane Obs. in Italy, 5 in MPEC 2013-X73 -- C/2013 U2, P/2013 R3, C/2013 P4, 269P, 257P
K38M57 Obs., 3 in MPEC 2013-X77 -- 2013 UR3, 2009 DM1, 2008 AJ33
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2013-X74, 2013-X75 & 2013-X76 -- 2013 XZ21, 2013 XY21, 2013 XA22
C10Maisoncelles Obs. in France, 21 in MPEC 2013-X73 -- C/2013 X1, C/2013 W2, C/2013 V5, C/2013 V3, C/2013 V2, C/2013 U2, P/2013 T2, C/2013 R1, C/2012 X1, C/2012 U1, C/2011 J2, 291P, 290P, 270P, 266P, 257P, 178P, 124P, 65P, 52P, 10P
232Masquefa Obs. in Spain, 3 in MPEC 2013-X73 -- C/2013 V3, C/2013 V1, 290P
5681David Jewitt on Mauna Kea in Hawaii, 1 in MPEC 2013-X73 -- P/2010 A2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-X77 -- 2013 TK
213Montcabre Obs. in Spain, 6 in MPEC 2013-X73 -- C/2013 V4, C/2013 V2, C/2013 V1, C/2013 R1, C/2013 A1, 290P
945Monte Deva Obs. in Spain, 8 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, C/2013 V1, C/2013 R1, C/2011 J2, C/2009 F4, 290P, 154P
900Moriyama Obs. in Japan, 5 in MPEC 2013-X73 -- C/2013 V5, C/2012 K1, 178P, 84P, 65P
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-X73, 2013-X75 & 2013-X76 -- 2013 XZ21, 2013 XA22, 184P
E07Murrumbateman Obs. in New South Wales, 3 in MPEC 2013-X73 -- C/2013 V5, C/2013 V4, C/2013 V1
K15Murviel-les-Montpellier Obs., 5 in MPEC 2013-X73 -- C/2013 V1, C/2012 F6, 290P, 154P, 84P
D81Nagano Obs. in Japan, 3 in MPEC 2013-X73 -- C/2013 V2, C/2010 S1, 154P
A24New Millennium Obs. in Italy, 7 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, 290P, 178P, 124P, 119P, 84P
C23Olmen Obs. in Belgium, 11 in MPEC 2013-X73 -- C/2013 V3, C/2013 V2, C/2013 R1, C/2012 X1, C/2012 J1, C/2012 F6, C/2012 A2, C/2011 J2, 290P, 178P, 84P
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-X73 -- C/2013 V5
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2013-X77 -- 52760, 162566
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-X73 & 2013-X74 -- 2013 XY21, 270P, 178P, 40P
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-X73 -- C/2012 F6
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 6 in MPEC 2013-X73 -- C/2013 V1, C/2013 A1, C/2011 F1, C/2009 F4, 292P, 119P
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2013-X73 -- C/2013 R1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-X73 -- 184P
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-X73 -- 178P
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-X75 -- 2013 XZ21
K90Sopot Obs., 8 in MPEC 2013-X73 -- C/2013 V5, C/2013 V3, C/2013 V2, C/2013 R1, C/2012 J1, 290P, 154P, 124P
C36Starry Wanderer Obs. in Belarus, 2 in MPEC 2013-X73 -- C/2013 V3, 154P
926Tenagra II Obs. in Arizona, 4 in MPECs 2013-X74, 2013-X75 & 2013-X77 -- 2013 XZ21, 2013 XY21, 2013 XW8, 2013 XU21
B51Vallauris Obs. in France, 2 in MPEC 2013-X73 -- C/2013 R1, C/2012 X1
H47Vicksburg Obs. in Mississippi, 2 in MPEC 2013-X73 -- C/2013 V3, 134P
I45W Crucis Obs. in Argentina, 1 in MPEC 2013-X73 -- C/2012 J1
367Yatsuka Obs. in Japan, 6 in MPEC 2013-X73 -- C/2013 V3, C/2013 R1, C/2012 X1, C/2011 J2, C/2006 S3, 290P
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 22 in MPEC 2013-X73 -- C/2013 R1, C/2013 P3, C/2013 P2, C/2013 F2, C/2012 X1, C/2012 U1, C/2012 S1, C/2012 K6, C/2012 K1, C/2012 F3, C/2011 R1, C/2010 U3, C/2006 S3, 291P, 257P, 209P, 184P, 129P, 119P, 102P, 32P, 2P
Q62[program code "[" (25) via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-X73 -- C/2009 F4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 XA22JPL Sentry21332065-211387.8e-08-6.35-6.540JPL: "Analysis based on 21 observations spanning 1.9871 days (2013-Dec-13.34467 to 2013-Dec-15.331781)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
2013 XU21NEODyS1632R 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 15 December '13

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

2133Noted that JPL Sentry has posted 2013 XA22 as an impact risk - see above
1657Generated Traffic Report
1632Noted that NEODyS has removed 2013 XU21 as an impact risk - see above
Grabbed MPEC 2013-X73 - Observations and Orbits of Comets - see above
Grabbed MPEC 2013-X74 - 2013 XY21 - see above
Grabbed MPEC 2013-X75 - 2013 XZ21 - see above
Grabbed MPEC 2013-X76 - 2013 XA22 - see above
Grabbed MPEC 2013-X77 - Daily Orbit Update - see above