Contents  on 20 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 20 February '12

Four objects reported inside ten LD

Four objects are reported passing inside ten lunar distances (LD) of Earth today. Risk-listed 2012 DX and 2012 DF4 enter Earth's Hill sphere. More distant, 2012 DZ enters ten LD, passing from 11.2 to 7.7 LD*, and risk-listed 2012 CS46 comes inside, passing from 10.1 to 8.5 LD*.

Coming toward Earth, 2012 DY (LD*) arrives inside ten LD on February 22nd, radar target 2011 CP4 on February 22nd, and 2008 EJ85 on March 4th.

This report was updated at 2357 UTC with new discovery 2012 DF4 (MPEC) and follow-up in today's DOU MPEC for 2012 DZ, 2012 DY (LD*), and 2012 DX. This report was previously updated at 1551 UTC.


Notes: 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. Distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also today's timeline plus current additional details, sky chart, and ephemerides.

NEOCP Activity  on 20 February '12

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. All of these were "one nighters." So far The Tracking News has counted a total of 25 listings on the NEOCP today.

New MPECs  on 20 February '12

Minor Planet Electronic Circulars

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


MPEC 2012-D36 - "23:01 UT" - 2012 DM4


MPEC 2012-D35 - "22:59 UT" - 2012 DL4


MPEC 2012-D34 - "22:57 UT" - 2012 DK4


MPEC 2012-D33 - "22:55 UT" - 2012 DJ4


MPEC 2012-D32 - "22:53 UT" - 2012 DH4


MPEC 2012-D31 - "22:50 UT" - 2012 DG4


MPEC 2012-D30 - "22:48 UT" - 2012 CA53


MPEC 2012-D29 - "22:32 UT" - 2012 DF4


MPEC 2012-D28 - "22:29 UT" - 2011 YQ10


<< DOU on 20 Feb. '12 >>  MPEC 2012-D27 - "06:03 UT" - Daily Orbit Update

Observers  on 20 February '12

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 4 in MPEC 2012-D27 -- 32906, 162186, 141018, 101873
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2012-D27, 2012-D29, 2012-D32, 2012-D33, 2012-D35 & 2012-D36 -- 2012 DP, 2012 DM4, 2012 DL4, 2012 DJ4, 2012 DH4, 2012 DF4, 2012 CT, 2012 CP36, 2012 CN46, 2012 CC17, 2012 CA21, 2012 BT23, 2012 BS23, 2012 BC124, 2012 BB77, 2012 AA11, 2011 XO3, 2011 XE1, 2010 LY63, 2008 DG5, 2003 QZ29, 2002 EL6, 29075
I47Auger Obs. in Argentina, 1 in MPEC 2012-D32 -- 2012 DH4
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-D27 -- 3103
300Bisei Spaceguard Center in Japan, 5 in MPECs 2012-D27, 2012-D29, 2012-D32, 2012-D34 & 2012-D36 -- 2012 DZ, 2012 DM4, 2012 DK4, 2012 DH4, 2012 DF4
I99Blanquita Obs. in Spain, 2 in MPEC 2012-D27 -- 209924, 1036
G51Byrne Obs. in southern California, 2 in MPECs 2012-D34 & 2012-D36 -- 2012 DM4, 2012 DK4
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-D27, 2012-D31, 2012-D32 & 2012-D36 -- 2012 DM4, 2012 DH4, 2012 DG4, 2012 CP36, 96631, 263976, 154269, 137925
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2012-D34 & 2012-D35 -- 2012 DL4, 2012 DK4
448Desert Moon Obs. in New Mexico, 6 in MPEC 2012-D27 -- 2012 CM29, 2012 CD29, 2012 BZ76, 2012 BB77, 2011 YU74, 68267
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-D34 -- 2012 DK4
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2012-D32 -- 2012 DH4
J95Great Shefford Obs. in England, 10 in MPECs 2012-D27, 2012-D29, 2012-D30, 2012-D32, 2012-D34, 2012-D35 & 2012-D36 -- 2012 DZ, 2012 DY, 2012 DX, 2012 DM4, 2012 DL4, 2012 DK4, 2012 DH4, 2012 DF4, 2012 CA53, 2012 CA21
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2012-D27 -- 2011 YV15, 2011 SL102, 3103
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-D27 -- 2012 BN11
704LINEAR in New Mexico, 12 in MPECs 2012-D27, 2012-D34 & 2012-D35 -- 2012 DL4, 2012 DK4, 2012 CR45, 2005 AH14, 85628, 66251, 311554, 21277, 209924, 138013, 4055, 3352
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-D31 & 2012-D32 -- 2012 DH4, 2012 DG4
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2012-D27, 2012-D29 & 2012-D30 -- 2012 DF4, 2012 CP36, 2012 CA53
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2012-D27 -- 2012 BA35, 2008 DJ5, 313552, 142348, 4503
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-D28 -- 2011 YQ10
A24New Millennium Obs. in Italy, 21 in MPEC 2012-D27 -- 2012 BT23, 2012 BC124, 2011 SL102, 85839, 32906, 313548, 275558, 21088, 163000, 162186, 162038, 154269, 153951, 143651, 142348, 141018, 138524, 138013, 101873, 6050, 3103
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2012-D29 & 2012-D31 -- 2012 DG4, 2012 DF4
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-D29 -- 2012 DF4
H36Sandlot Obs. in Kansas, 3 in MPEC 2012-D27 -- 2012 BD27, 2011 EB12, 2008 CH1
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2012-D27 & 2012-D33 -- 2012 DJ4, 2012 CR45, 2011 PS, 2008 GE1, 276049
291Spacewatch 1.8m telescope in Arizona, 19 in MPECs 2012-D27, 2012-D31 & 2012-D33 -- 2012 DJ4, 2012 DG4, 2012 CQ36, 2012 CM29, 2012 CL29, 2012 CK2, 2012 BZ76, 2012 BN11, 2012 BK11, 2012 BG86, 2011 YQ10, 2010 ON101, 2010 FQ, 2003 XV10, 2003 HB6, 1999 FJ21, 1996 AJ1, 1995 FJ, 1995 DW1
I93St. Pardon de Conques Obs. in France, 6 in MPECs 2012-D27, 2012-D29, 2012-D33, 2012-D34, 2012-D35 & 2012-D36 -- 2012 DM4, 2012 DL4, 2012 DK4, 2012 DJ4, 2012 DF4, 2012 BJ134
B18Terskol Obs. in Russia, 5 in MPECs 2012-D31, 2012-D33, 2012-D34, 2012-D35 & 2012-D36 -- 2012 DM4, 2012 DL4, 2012 DK4, 2012 DJ4, 2012 DG4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 February '12

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
2012 DZJPL Sentry1549R E M O V E DJPL: Risk listing removed at 0851 UTC.
2012 DXJPL Sentry15492096-2111482.5e-05-5.92-6.330JPL: "Analysis based on 23 observations spanning .61322 days (2012-Feb-19.26892 to 2012-Feb-19.882139)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2012 CA21NEODyS15492073-207829.86e-06-2.09-2.111NEODyS: "Based on 57 optical observations (of which 3 are rejected as outliers) from 2012-02-12.121 to 2012-02-19.799."

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 20 February '12

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

2357Updated Traffic Report
2311Grabbed MPEC 2012-D28 - 2011 YQ10 - see above
Grabbed MPEC 2012-D29 - 2012 DF4 - see above
Grabbed MPEC 2012-D30 - 2012 CA53 - see above
Grabbed MPEC 2012-D31 - 2012 DG4 - see above
Grabbed MPEC 2012-D32 - 2012 DH4 - see above
Grabbed MPEC 2012-D33 - 2012 DJ4 - see above
Grabbed MPEC 2012-D34 - 2012 DK4 - see above
Grabbed MPEC 2012-D35 - 2012 DL4 - see above
Grabbed MPEC 2012-D36 - 2012 DM4 - see above
1549Noted that NEODyS has updated its 2012 CA21 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DX risk assessment - see above
Noted that JPL Sentry has removed 2012 DZ as an impact risk - see above
Grabbed MPEC 2012-D27 - Daily Orbit Update - see above