Contents  on 3 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 3 December '13

One object reported inside ten LD

There is one visitor reported to inside a radius of ten lunar distances (LD) from our planet today. 2013 WV43 comes its closest to Earth on this passage, reaching 9.48 LD at 0401 UT.

This report was updated at 1849 UTC with follow-up in today's DOU MPEC for departed risk-listed objects 2013 WZ44, 2013 WX44, and 2013 WM. Today's first traffic report was generated at 1532 UTC.



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 3 December '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, twelve were "one nighters." So far The Tracking News has counted a total of 34 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 3 December '13

Minor Planet Electronic Circulars

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


MPEC 2013-X23 - "19:08 UT" - 2013 WY67


MPEC 2013-X22 - "19:01 UT" - 2013 WX67


<< DOU on 3 Dec. '13 >>  MPEC 2013-X21 - "17:32 UT" - Daily Orbit Update

Observers  on 3 December '13

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2013-X21, 2013-X22 & 2013-X23 -- 2013 WY67, 2013 WX67, 2013 WU43, 2013 WS43, 2013 WR43, 2013 WN, 2013 WH, 2013 WC44, 2013 WA44, 2013 UB1, 2013 TD4, 2013 RR5, 2013 RK16, 2009 WG54
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-X21 -- 377097, 251346
300Bisei Spaceguard Center in Japan, 9 in MPEC 2013-X21 -- 2013 RM43, 2013 RH74, 2011 WU95, 2008 JR26, 2008 HB38, 252793, 251346, 6063, 1627
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2013-X21 -- 2013 VD13, 377097, 22771, 16834, 159399, 9950, 6178, 3988
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-X21 -- 2002 VR94
J27El Guijo Obs. in Spain, 3 in MPEC 2013-X21 -- 251346, 20460, 162566
Z81Estrella de Mar Obs., 1 in MPEC 2013-X21 -- 2013 VC10
355Hadano Obs. in Japan, 1 in MPEC 2013-X21 -- 2005 RQ6
240Herrenberg Obs. in Germany, 3 in MPEC 2013-X21 -- 2013 UR3, 39565, 265661
K48Keyhole Obs., 2 in MPEC 2013-X21 -- 2013 UR3, 2010 XZ67
V37LCOGT Fort Davis in Texas, 1 in MPEC 2013-X22 -- 2013 WX67
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPEC 2013-X21 -- 2013 WZ44, 2013 WT43, 2013 WM, 2013 WA44
C91Montevenere Obs., 1 in MPEC 2013-X21 -- 10115
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-X21 -- 2013 WW44, 2013 WU44
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-X21 -- 52760
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2013-X22 & 2013-X23 -- 2013 WY67, 2013 WX67
H23Pear Tree Obs. in Florida, 1 in MPEC 2013-X21 -- 2013 UR3
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2013-X21 -- 2013 VY13, 2013 VD13, 2013 UR3, 2013 TV135, 2013 TH5, 2011 WM2, 2010 XZ67, 2010 CL19, 2005 RQ6, 2003 WX25, 251346
D29Purple Mtn. Obs. Xuyi Station in China, 12 in MPEC 2013-X21 -- 2013 WT45, 2013 PV6, 2008 WK32, 370688, 22771, 13651, 10115, 9950, 8201, 7753, 6178, 1580
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-X21 -- 138205
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2013-X21 -- 2013 TV135
033Schwarzschild Obs. in Germany, 1 in MPEC 2013-X22 -- 2013 WX67
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-X21 -- 2013 RB74, 9950
291Spacewatch 1.8m telescope in Arizona, 19 in MPECs 2013-X21, 2013-X22 & 2013-X23 -- 2013 WZ44, 2013 WY67, 2013 WX67, 2013 WX44, 2013 WW45, 2013 WW44, 2013 WU44, 2013 WU43, 2013 WT43, 2013 WR67, 2013 WR43, 2013 WL, 2013 WH, 2013 WC44, 2013 WB44, 2013 US3, 2013 QJ10, 2013 GG69, 2008 VN
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2013-X21 -- 2013 UR3
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-X23 -- 2013 WY67
Q62]program code "]" (27) via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-X21 -- 2062
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 WS67NEODyS15302046-210521.19e-07-5.64-5.640NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2013-11-29.474 to 2013-12-02.358."
2013 WR67JPL Sentry21382021-2087173.7e-06-2.92-2.920JPL: "Analysis based on 17 observations spanning 3.8969 days (2013-Nov-29.30924 to 2013-Dec-03.20615)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS15302021-2109511.21e-06-3.66-3.730NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2013-11-29.310 to 2013-12-02.049."
2013 WZ44JPL Sentry2138211118.5e-07-6.62-6.620JPL: "Analysis based on 31 observations spanning 5.0773 days (2013-Nov-28.411 to 2013-Dec-03.488337)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2013 WX44JPL Sentry2004207113.1e-07-6.90-6.900JPL: "Analysis based on 21 observations spanning 5.8082 days (2013-Nov-27.50384 to 2013-Dec-03.312)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
NEODyS15302071-207112.45e-07-7.03-7.030NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2013-11-27.505 to 2013-11-30.167."
2013 WT43JPL Sentry21382052-205321.1e-08-6.31-6.340JPL: "Analysis based on 32 observations spanning 7.1466 days (2013-Nov-26.32112 to 2013-Dec-03.467698)." Diameter approximately 0.110 km. from mean, weighted H=22.5.
NEODyS15302052-209341.55e-07-5.13-5.390NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2013-11-26.322 to 2013-12-02.176."
2013 WMJPL Sentry21382047-210532.3e-06-4.38-4.400JPL: "Analysis based on 19 observations spanning 8.1320 days (2013-Nov-25.24629 to 2013-Dec-03.378317)." Diameter approximately 0.056 km. from mean, weighted H=23.9.

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 3 December '13

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

2138Noted that JPL Sentry has updated its 2013 WM risk assessment - see above
Noted that JPL Sentry has updated its 2013 WR67 risk assessment - see above
Noted that JPL Sentry has updated its 2013 WT43 risk assessment - see above
Noted that JPL Sentry has updated its 2013 WZ44 risk assessment - see above
2004Noted that JPL Sentry has updated its 2013 WX44 risk assessment - see above
1932Grabbed MPEC 2013-X22 - 2013 WX67 - see above
Grabbed MPEC 2013-X23 - 2013 WY67 - see above
1849Updated Traffic Report
1847Grabbed MPEC 2013-X21 - Daily Orbit Update - see above
1530Noted that NEODyS has posted 2013 WR67 as an impact risk - see above
Noted that NEODyS has posted 2013 WS67 as an impact risk - see above
Noted that NEODyS has updated its 2013 WT43 risk assessment - see above
Noted that NEODyS has updated its 2013 WX44 risk assessment - see above