Contents  on 18 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 18 February '13

Eight objects reported inside ten LD

There are eight objects reported to be less than ten lunar distances (LD) from our planet today. Within Earth's Hill sphere, risk-listed 2013 CW129 comes its closest to us this time around, reaching 1.3 LD at 1604 UT (uncertainty: +/- 1.817 hours), and its closest to the Moon -- 2.0 LD at 1549 UT. And radar target intruder 2012 DA14 exits Earth's Hill sphere, going from 3.11 to 4.50 LD.

Out further, 2013 CZ87 is inbound from 7.25 to 7.01 LD while 2013 CE82 is outbound from 4.69 to 6.01 LD, 2013 DB from 5.64 to 6.39 LD, radar target 2013 BS45 from 6.34 to 6.80 LD, intruder 2013 CL129 from 8.61 to 9.93 LD, and radar target 2013 BV15 leaves ten LD, traveling from 9.41 to 11.12 LD.

On approach as the next known object to come this close, risk-listed 2007 EO88 arrives inside ten LD on March 15th.

This report was generated at 1529 UTC with follow-up in today's DOU MPEC for 2013 DB, 2013 CE82, and 2012 DA14 plus departed objects 2013 BD74 (adding 5.01 days to the previous 11.88-day observing arc) and 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.

NEOCP Activity  on 18 February '13

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 43 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 18 February '13

Minor Planet Electronic Circulars

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


MPEC 2013-D29 - "17:13 UT" - 2013 DU


MPEC 2013-D28 - "17:04 UT" - 2013 DT


MPEC 2013-D27 - "17:00 UT" - 2013 CA134


MPEC 2013-D26 - "16:55 UT" - 2013 CZ133


MPEC 2013-D25 - "16:50 UT" - 2013 CY133


<< DOU on 18 Feb. '13 >>  MPEC 2013-D24 - "06:04 UT" - Daily Orbit Update


MPEC 2013-D23 - "00:23 UT" - Comet P/2013 CE31 (MOSS)

Observers  on 18 February '13

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2013-D24, 2013-D26, 2013-D28 & 2013-D29 -- 2013 DU, 2013 DT, 2013 DF, 2013 CZ133, 2013 CW83, 2013 CV83, 2013 CT83, 2013 CT36, 2013 CS83, 2013 CQ35, 2013 CJ89, 2013 BC18, 2013 AU76, 2013 AE69, 2012 XY6, 2012 XS134
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-D24 -- 2012 DA14
B66Casasco Obs. in Italy, 1 in MPEC 2013-D24 -- 2012 DA14
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2013-D24 & 2013-D29 -- 2013 DU, 2013 DA, 2012 TJ146, 2011 BK24, 2006 WS1, 2000 DL8, 1999 CT8, 338172, 338049, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-D24 -- 2013 CL89, 2013 CK89, 2013 CK129, 2013 BD70, 2013 AH11, 2008 SC85, 2007 KN4, 2005 LY19, 2001 YF1, 2001 OG25, 310842
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-D29 -- 2013 DU
958Dax Obs. in France, 1 in MPEC 2013-D24 -- 2012 DA14
448Desert Moon Obs. in New Mexico, 5 in MPEC 2013-D24 -- 2013 DF, 2013 CN35, 2010 GR7, 2000 EJ26, 274855
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2013-D26 -- 2013 CZ133
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2013-D24 & 2013-D29 -- 2013 DU, 2012 DA14
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 2 in MPECs 2013-D25 & 2013-D27 -- 2013 CY133, 2013 CA134
C73Galati Obs. in Romania, 1 in MPEC 2013-D24 -- 2012 DA14
J95Great Shefford Obs. in England, 4 in MPECs 2013-D24, 2013-D28 & 2013-D29 -- 2013 DU, 2013 DT, 2013 DB, 2012 DA14
B86Hagen Obs. in Germany, 1 in MPEC 2013-D24 -- 2012 DA14
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-D24 -- 285263
D95Kurihara Obs. in Japan, 1 in MPEC 2013-D24 -- 2012 DA14
W85LCOGT Cerro Tololo A in Chile, 4 in MPECs 2013-D24 & 2013-D27 -- 2013 DG, 2013 CY129, 2013 CV129, 2013 CA134
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2013-D27 -- 2013 CA134
J38La Vara Obs. in Spain, 1 in MPEC 2013-D24 -- 2012 DA14
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2013-D23 & 2013-D27 -- P/2013 CE31, 2013 CA134
C91Montevenere Obs., 2 in MPEC 2013-D24 -- 2012 DA14, 11405
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-D24 & 2013-D28 -- 2013 DT, 2013 CV83, 2013 CM118, 2013 BD74, 2011 BN24, 177016, 9172
A13Naef Obs. in Switzerland, 1 in MPEC 2013-D24 -- 2013 CT36
J69North Obs. in England, 1 in MPEC 2013-D24 -- 2012 DA14
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-D23 -- P/2013 CE31
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2013-D23, 2013-D25 & 2013-D27 -- 2013 CY133, P/2013 CE31, 2013 CA134
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-D24 -- 2010 QD2, 99942
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-D23 -- P/2013 CE31
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-D24 -- 2013 CE82
071Rhozen Obs. in Bulgaria, 1 in MPEC 2013-D24 -- 2012 DA14
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-D29 -- 2013 DU
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-D24 -- 2012 DA14
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-D24 -- 2012 DA14
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2013-D23 & 2013-D24 -- 2013 CT36, 2013 CQ35, P/2013 CE31, 2010 RK64, 2007 EH88, 214869, 5693
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2013-D24, 2013-D25, 2013-D26, 2013-D27 & 2013-D28 -- 2013 DT, 2013 CZ133, 2013 CY133, 2013 CY, 2013 CU83, 2013 CK129, 2013 CA134, 2013 BP73, 2011 BN24
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-D29 -- 2013 DU
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2013-D24 -- 2008 DG17
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-D24 -- 2012 QE50
718Wiggins Obs. in Utah, 3 in MPECs 2013-D24 & 2013-D29 -- 2013 DU, 2013 DB, 2013 CT36
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-D24 -- 2012 DA14
H06%Ernesto Guido in Italy via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-D24 -- 2012 DA14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 CU129NEODyS15262090-209021.06e-08-4.31-4.580NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2013-02-13.321 to 2013-02-17.425."
2013 CK129JPL Sentry15262072-209922.4e-07-5.16-5.170JPL: "Analysis based on 25 observations spanning 2.9440 days (2013-Feb-14.49468 to 2013-Feb-17.43872)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS1526R E M O V E D-
2013 CU83JPL Sentry1526R E M O V E DJPL: Risk listing removed at 1049 UTC.
2013 CYJPL Sentry15262069-211094.3e-06-7.31-8.030JPL: "Analysis based on 77 observations spanning 15.903 days (2013-Feb-01.34874 to 2013-Feb-17.25131)." Diameter approximately 0.008 km. from mean, weighted H=28.3.
NEODyS15262069-2098166.85e-06-7.13-7.980NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2013-02-01.350 to 2013-02-17.252."
2013 BP73JPL Sentry15262078-210791.7e-05-2.42-2.700JPL: "Analysis based on 30 observations spanning 26.149 days (2013-Jan-22.24343 to 2013-Feb-17.39214)." Diameter approximately 0.310 km. from mean, weighted H=20.2.
NEODyS15262093-209651.22e-05-2.56-2.830NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2013-01-22.244 to 2013-02-17.393."

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 18 February '13

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

1747Grabbed MPEC 2013-D25 - 2013 CY133 - see above
Grabbed MPEC 2013-D26 - 2013 CZ133 - see above
Grabbed MPEC 2013-D27 - 2013 CA134 - see above
Grabbed MPEC 2013-D28 - 2013 DT - see above
Grabbed MPEC 2013-D29 - 2013 DU - see above
1529Generated Traffic Report
1526Noted that JPL Sentry has updated its 2013 BP73 risk assessment - see above
Noted that NEODyS has updated its 2013 BP73 risk assessment - see above
Noted that JPL Sentry has updated its 2013 CK129 risk assessment - see above
Noted that NEODyS has removed 2013 CK129 as an impact risk - see above
Noted that NEODyS has posted 2013 CU129 as an impact risk - see above
Noted that JPL Sentry has removed 2013 CU83 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-D24 - Daily Orbit Update - see above
0145Grabbed MPEC 2013-D23 - Comet P/2013 CE31 (MOSS) - see above