Contents  on 18 February '12

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 '12

No objects reported inside ten LD

There are no asteroids reported passing within ten lunar distances (LD) of Earth today. Coming toward Earth, newly discovered 2012 CS46 is preliminarily calculated with great uncertainty to arrive inside ten LD on February 20th, while radar target 2011 CP4 arrives on February 22nd and 2008 EJ85 on March 4th.

This report was updated at 0008 Feb. 19th UTC with new discoveries 2012 CS46 (MPEC) and already departed 2012 CQ46 (MPEC). This report was dated 0114 UTC.


Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline plus current additional details, sky chart, and ephemerides.

NEOCP Activity  on 18 February '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2215 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, ten were "one nighters." The Tracking News counted a total of 32 listings on the NEOCP on this day.

New MPECs  on 18 February '12

Minor Planet Electronic Circulars

There were twelve MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-D21 - "23:05 UT" - 2010 CG19


MPEC 2012-D20 - "21:42 UT" - 2012 DP


MPEC 2012-D19 - "21:40 UT" - 2012 CS46


MPEC 2012-D18 - "21:38 UT" - 2012 CR46


MPEC 2012-D17 - "21:35 UT" - 2012 CQ46


MPEC 2012-D16 - "21:33 UT" - 2012 CP46


MPEC 2012-D15 - "21:07 UT" - 2012 DO


MPEC 2012-D14 - "21:05 UT" - 2012 DN


MPEC 2012-D13 - "21:03 UT" - 2012 CO46


MPEC 2012-D12 - "21:00 UT" - 2012 CN46


<< DOU on 18 Feb. '12 >>  MPEC 2012-D11 - "06:03 UT" - Daily Orbit Update


MPEC 2012-D10 - "00:59 UT" - 2012 CR45

Observers  on 18 February '12

A total of 28 observers appeared in this day's MPECs.

CodeObserver / observatory
J97Alginet Obs. in Spain, 3 in MPEC 2012-D11 -- 4183, 2062, 1620
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2012-D11, 2012-D12, 2012-D14 & 2012-D20 -- 2012 DP, 2012 DN, 2012 CS, 2012 CN46, 2012 CD18, 2012 CA21, 2012 BT23, 2012 BR23, 2012 BO77, 2012 BJ11, 2012 BC20, 2012 BC124, 2012 BB2, 2012 AT10, 2012 AA11, 2011 XO3, 2011 XD1, 2011 VU5, 2008 ER, 29075
I47Auger Obs. in Argentina, 2 in MPECs 2012-D11 & 2012-D15 -- 2012 DO, 2009 AV
B75Betelgeuse Station in Italy, 1 in MPEC 2012-D11 -- 2012 BJ134
I99Blanquita Obs. in Spain, 4 in MPEC 2012-D11 -- 21088, 192642, 162186, 141018
B66Casasco Obs. in Italy, 16 in MPEC 2012-D11 -- 2011 SL102, 99942, 310842, 8567, 7358, 7092, 6050, 4183, 3691, 3200, 3103, 2062, 1943, 1866, 1627, 1620
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2012-D18 & 2012-D21 -- 2012 CR46, 2010 CG19
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2012-D11 & 2012-D15 -- 2012 DO, 2012 CA21
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-D11 -- 162186
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-D11 -- 2012 CR45
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-D13 -- 2012 CO46
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2012-D15 -- 2012 DO
J95Great Shefford Obs. in England, 1 in MPEC 2012-D21 -- 2010 CG19
H05Kline Obs. in Colorado, 1 in MPEC 2012-D11 -- 2008 PF1
168Kourovskaya Obs. in Russia, 3 in MPEC 2012-D11 -- 2011 SL102, 32906, 16816
A14Les Engarouines Obs. in France, 1 in MPEC 2012-D11 -- 189008
C94MASTER-II Obs. Tunka in Russia, 2 in MPEC 2012-D11 -- 2011 YG6, 29075
B28Mandi Obs. in Italy, 1 in MPEC 2012-D11 -- 2006 AL8
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2012-D10, 2012-D16, 2012-D17 & 2012-D19 -- 2012 CS46, 2012 CR45, 2012 CQ46, 2012 CP46
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-D11 -- 2012 BJ134, 2002 AW
C91Montevenere Obs., 1 in MPEC 2012-D11 -- 162186
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-D12 -- 2012 CN46
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2012-D11 -- 85990
A24New Millennium Obs. in Italy, 28 in MPEC 2012-D11 -- 2012 BC20, 2012 BC124, 2011 YV15, 2011 SL102, 85990, 85839, 32906, 313548, 275558, 237805, 21088, 162186, 162038, 154269, 153951, 152941, 143651, 142348, 141018, 138524, 138013, 137925, 101873, 9400, 6050, 4055, 3352, 3103
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2012-D10, 2012-D11, 2012-D13, 2012-D14, 2012-D16, 2012-D17, 2012-D18, 2012-D19 & 2012-D20 -- 2012 DP, 2012 DN, 2012 CS46, 2012 CR46, 2012 CR45, 2012 CQ46, 2012 CP46, 2012 CO46, 2009 QE8, 39557, 21277, 154589, 154555, 3551, 3102
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-D15 -- 2012 DO
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2012-D12, 2012-D13 & 2012-D14 -- 2012 DN, 2012 CO46, 2012 CN46
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2012-D10 & 2012-D14 -- 2012 DN, 2012 CR45
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 February '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2234 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
2012 DNJPL Sentry23592028-209372.8e-09-4.61-4.780JPL: "Analysis based on 17 observations spanning 1.9403 days (2012-Feb-16.52183 to 2012-Feb-18.46212)." Diameter approximately 0.982 km. from mean, weighted H=17.7.

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 '12

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

0008 2/19Updated Traffic Report
0000 2/19Grabbed MPEC 2012-D21 - 2010 CG19 - see above
2359Noted that JPL Sentry has posted 2012 DN as an impact risk - see above
2215Grabbed MPEC 2012-D12 - 2012 CN46 - see above
Grabbed MPEC 2012-D13 - 2012 CO46 - see above
Grabbed MPEC 2012-D14 - 2012 DN - see above
Grabbed MPEC 2012-D15 - 2012 DO - see above
Grabbed MPEC 2012-D16 - 2012 CP46 - see above
Grabbed MPEC 2012-D17 - 2012 CQ46 - see above
Grabbed MPEC 2012-D18 - 2012 CR46 - see above
Grabbed MPEC 2012-D19 - 2012 CS46 - see above
Grabbed MPEC 2012-D20 - 2012 DP - see above
1634Grabbed MPEC 2012-D11 - Daily Orbit Update - see above
0112Grabbed MPEC 2012-D10 - 2012 CR45 - see above