Contents  on 17 February '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 February '13

Eight objects reported inside ten LD

Eight objects are are known to be inside a radius of ten lunar distances (LD) from our home planet today. Within Earth's Hill sphere, radar target intruder 2012 DA14 is outbound from 1.71 to 3.11 LD and newly announced risk-listed 2013 CW129 enters the sphere, moving from 6.4 to 2.8 LD (with an uncertainty of +/- 1.817 hours).

Out further, 2013 CE82 comes its closest to Earth this time around, reaching 4.60 LD at 1639 UT, and 2013 CZ87 is inbound from 7.81 to 7.25 LD, while the rest are all outbound: 2013 DB from 5.15 to 5.64 LD, radar target 2013 BS45 from 5.93 to 6.34 LD, intruder 2013 CL129 from 7.28 to 8.61 LD, and radar target 2013 BV15from 7.75 to 9.41 LD.

Next known to be coming our way is risk-listed 2007 EO88, which arrives inside ten LD on March 15th.

This report was generated at 1835 UTC with new discovery 2013 CW129 (MPEC), radar observation of 2012 DA14, and follow-up in today's DOU MPEC for 2013 DB, 2013 CE82, and departed intruder 2013 CY.



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.

Radar Astrometry  on 17 February '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 1725 UTC when the database was dated 17 Feb.

NEOCP Activity  on 17 February '13

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 42 listings on the NEOCP today.

New MPECs  on 17 February '13

Minor Planet Electronic Circulars

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


MPEC 2013-D22 - "21:12 UT" - Comet C/2013 C2 (Tenagra)


MPEC 2013-D21 - "15:19 UT" - 2013 DG


MPEC 2013-D20 - "15:14 UT" - 2013 DF


MPEC 2013-D19 - "15:10 UT" - 2013 CY129


MPEC 2013-D18 - "15:05 UT" - 2013 CX129


MPEC 2013-D17 - "15:00 UT" - 2013 CW129


MPEC 2013-D16 - "14:56 UT" - 2013 CV129


MPEC 2013-D15 - "14:50 UT" - 2013 CU129


<< DOU on 17 Feb. '13 >>  MPEC 2013-D14 - "06:05 UT" - Daily Orbit Update

Observers  on 17 February '13

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-D22 -- C/2013 C2
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2013-D14, 2013-D15, 2013-D16 & 2013-D18 -- 2013 CX129, 2013 CV129, 2013 CU129, 2013 CN35
A81Balzaretto Obs. in Italy, 2 in MPEC 2013-D14 -- 2010 QD2, 2008 DG17
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2013-D14 -- 2013 DB, 2013 CR35, 2013 CP35, 2013 CK89, 2011 SD173, 2006 DY, 68278, 5693
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2013-D14 & 2013-D18 -- 2013 CX129, 2004 BE85, 5863
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-D22 -- C/2013 C2
958Dax Obs. in France, 1 in MPEC 2013-D14 -- 2013 DB
448Desert Moon Obs. in New Mexico, 5 in MPECs 2013-D14 & 2013-D22 -- 2013 CW35, C/2013 C2, 2010 XL69, 2008 CJ70, 2005 EM30
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-D14 -- 2013 DA
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2013-D15 -- 2013 CU129
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-D20 -- 2013 DF
203GiaGa Obs. in Italy, 1 in MPEC 2013-D20 -- 2013 DF
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2012 DA14
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2012 DA14
J95Great Shefford Obs. in England, 2 in MPECs 2013-D15 & 2013-D22 -- 2013 CU129, C/2013 C2
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2013-D18 & 2013-D22 -- 2013 CX129, C/2013 C2
W86LCOGT Cerro Tololo B in Chile, 2 in MPEC 2013-D14 -- 2013 CY, 2013 CU83
5682David Tholen's team on Mauna Kea in Hawaii, 5 in MPECs 2013-D14, 2013-D17 & 2013-D19 -- 2013 CY129, 2013 CW129, 2013 CM118, 2013 CB88, 2012 XT134
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPECs 2013-D14, 2013-D16 & 2013-D17 -- 2013 CW129, 2013 CV129, 2013 CL118, 2013 CE129, 2013 CA88, 2001 TY44
C91Montevenere Obs., 2 in MPEC 2013-D14 -- 2008 DG17, 99942
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-D14, 2013-D20 & 2013-D21 -- 2013 DG, 2013 DF, 2013 BR45, 2012 CD29, 159368, 8507
J93Mt. Tuffley Obs. in England, 3 in MPEC 2013-D14 -- 11405, 4179, 3752
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-D14 -- 2001 TY44
A13Naef Obs. in Switzerland, 4 in MPEC 2013-D14 -- 2013 CW83, 2013 AA32, 137925, 4179
C27Pallerols Obs. in Spain, 1 in MPEC 2013-D14 -- 99942
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2013-D15, 2013-D16, 2013-D17, 2013-D18 & 2013-D19 -- 2013 CY129, 2013 CX129, 2013 CW129, 2013 CV129, 2013 CU129
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2013-D14 & 2013-D22 -- 2013 CE82, C/2013 C2
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-D20 -- 2013 DF
233San Vito Obs. in Italy, 5 in MPEC 2013-D14 -- 2013 AU76, 2010 QD2, 343098, 22753, 154347
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPECs 2013-D15 & 2013-D22 -- 2013 CU129, C/2013 C2
204Schiaparelli Obs. in Italy, 10 in MPECs 2013-D14 & 2013-D15 -- 2013 DA, 2013 CU129, 2013 BT18, 2013 BC18, 2013 AJ91, 2013 AA2, 2012 QP17, 2010 GE25, 2010 EW45, 2002 TY68
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2013-D14 -- 2012 CD29, 39796, 253062
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2013-D14, 2013-D15, 2013-D19 & 2013-D22 -- 2013 CY129, 2013 CU129, 2013 CT82, 2013 CB88, C/2013 C2, 2013 BO76, 2013 BF27, 2013 BE74, 2005 CZ6, 2002 LY1
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2013-D18, 2013-D20 & 2013-D22 -- 2013 DF, 2013 CX129, C/2013 C2
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-D22 -- C/2013 C2
C44Volta Obs. in Italy, 1 in MPEC 2013-D15 -- 2013 CU129
H06`Erik Bryssinck in Belgium via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-D22 -- C/2013 C2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-D22 -- C/2013 C2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 February '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 CW129JPL Sentry17252047-2101174.2e-08-8.55-8.690JPL: "Analysis based on 9 observations spanning .92149 days (2013-Feb-14.40925 to 2013-Feb-15.330741)." Diameter approximately 0.009 km. from mean, weighted H=27.8.
2013 CU129JPL Sentry17252079-211056.4e-09-4.59-4.740JPL: "Analysis based on 27 observations spanning 4.1035 days (2013-Feb-13.32055 to 2013-Feb-17.42409)." Diameter approximately 1.179 km. from mean, weighted H=17.3.
2013 CK129NEODyS17262099-209912.37e-08-6.40-6.40NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2013-02-14.495 to 2013-02-16.292."
2013 CB88JPL Sentry1725R E M O V E DJPL: Risk listing removed at 0951 UTC.
2013 CU83JPL Sentry17252025-2107363.2e-08-5.55-5.710JPL: "Analysis based on 20 observations spanning 4.7833 days (2013-Feb-10.40949 to 2013-Feb-15.192755)." Diameter approximately 0.180 km. from mean, weighted H=21.3.
NEODyS1725R E M O V E D-
2013 CT82NEODyS1725R E M O V E D-
JPL Sentry1725R E M O V E DJPL: Risk listing removed at 0952 UTC.
2013 CYJPL Sentry17252069-210673.8e-06-7.34-7.930JPL: "Analysis based on 75 observations spanning 13.883 days (2013-Feb-01.34874 to 2013-Feb-15.231266)." Diameter approximately 0.008 km. from mean, weighted H=28.3.
NEODyS17252068-2096122.41e-06-7.58-8.090NEODyS: "Based on 75 optical observations (of which 0 are rejected as outliers) from 2013-02-01.350 to 2013-02-15.232."

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 February '13

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

2241Grabbed MPEC 2013-D22 - Comet C/2013 C2 (Tenagra) - see above
1835Generated Traffic Report
1725Noted that JPL Sentry has removed 2013 CB88 as an impact risk - see above
Noted that NEODyS has posted 2013 CK129 as an impact risk - see above
Noted that JPL Sentry has removed 2013 CT82 as an impact risk - see above
Noted that NEODyS has removed 2013 CT82 as an impact risk - see above
Noted that JPL Sentry has posted 2013 CU129 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 CU83 risk assessment - see above
Noted that NEODyS has removed 2013 CU83 as an impact risk - see above
Noted that JPL Sentry has posted 2013 CW129 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 CY risk assessment - see above
Noted that NEODyS has updated its 2013 CY risk assessment - see above
Grabbed MPEC 2013-D14 - Daily Orbit Update - see above
Grabbed MPEC 2013-D15 - 2013 CU129 - see above
Grabbed MPEC 2013-D16 - 2013 CV129 - see above
Grabbed MPEC 2013-D17 - 2013 CW129 - see above
Grabbed MPEC 2013-D18 - 2013 CX129 - see above
Grabbed MPEC 2013-D19 - 2013 CY129 - see above
Grabbed MPEC 2013-D20 - 2013 DF - see above
Grabbed MPEC 2013-D21 - 2013 DG - see above
Noted Radar Astrometry database update - see above