Contents  on 23 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 23 February '12

Seven objects reported inside ten LD

Seven objects are reported moving within ten lunar distances (LD) of our planet today. 2012 DZ and risk-listed 2012 DX exit Earth's Hill sphere. Further away, risk-listed 2012 CS46 travels from 5.5 to 4.2 LD*, 2012 DF4 departs from inside ten LD, moving from 7.04 to 10.38 LD, newly discovered intruder 2012 DY13 exits ten LD, passing from 7.86 to 11.69 LD, radar target 2011 CP4 comes its closest to Earth this time around, reaching 9.11 LD at 1401 UTC, and 2012 DY moves from 9.64 to 9.24 LD.

Up next, new discovery 2012 DX13 arrives inside ten LD tomorrow and 2008 EJ85 comes inside on March 4th.

This report was updated at 2310 UTC with new discoveries 2012 DY13 (MPEC) and 2012 DX13 (MPEC) and follow-up in today's DOU MPEC for 2012 DY and 2011 CP4, plus recovery of 2009 DT10 (MPEC) on a return passage outside the ten LD "bubble." This report was previously updated at 1625, 0105, and 1757 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, current sky chart and object details (alt-details), and ephemerides.

NEOCP Activity  on 23 February '12

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 30 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 23 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-D50 - "23:40 UT" - 2012 BR61


MPEC 2012-D49 - "23:35 UT" - 2012 CG


MPEC 2012-D48 - "20:59 UT" - 2012 DZ13


MPEC 2012-D47 - "20:57 UT" - 2012 DY13


MPEC 2012-D46 - "20:54 UT" - 2012 DX13


MPEC 2012-D45 - "15:56 UT" - 2011 HJ7


<< DOU on 23 Feb. '12 >>  MPEC 2012-D44 - "06:03 UT" - Daily Orbit Update


MPEC 2012-D43 - "04:00 UT" - 2012 DQ8


MPEC 2012-D42 - "03:57 UT" - 2012 DP8


MPEC 2012-D41 - "03:54 UT" - 2009 DT10

Observers  on 23 February '12

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2012-D42, 2012-D44 & 2012-D47 -- 2012 DY13, 2012 DY, 2012 DP8, 2012 DM4, 2012 DL4, 2012 DK4, 2012 DH4, 2012 CT, 2012 CR45, 2012 CP46, 2012 CP36, 2012 CD18, 2012 CC17, 2012 CA21, 2012 BT23, 2012 BN11, 2012 BK77, 2012 BJ11, 2012 BE86, 2012 BC124, 2012 BB77, 2007 UB6, 2005 ND7, 2003 UN12
B75Betelgeuse Station in Italy, 2 in MPEC 2012-D44 -- 2012 CD29, 2012 BJ134
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2012-D41, 2012-D43, 2012-D44, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2011 YM63, 2009 DT10, 85990, 313548, 21277, 163000, 162181, 10563, 6050
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2012-D44 -- 2012 DO, 2012 DL4, 2012 DK4, 2012 DJ4, 2012 DH4, 2012 CO46, 2012 CL2, 2012 AT22
106Crni Vrh Obs. in Slovenia, 4 in MPECs 2012-D43, 2012-D44, 2012-D46 & 2012-D48 -- 2012 DZ13, 2012 DX13, 2012 DQ8, 101873
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-D44 -- 99799, 294739, 275558, 4596
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 6 in MPECs 2012-D43, 2012-D44, 2012-D46 & 2012-D48 -- 2012 DZ13, 2012 DX13, 2012 DQ8, 2012 DO, 2012 DH4, 2012 BJ134
113Drebach Obs. in Germany, 3 in MPEC 2012-D44 -- 162186, 141018, 137925
151Eschenberg Obs. in Switzerland, 2 in MPECs 2012-D44 & 2012-D46 -- 2012 DX13, 2002 AW
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2012-D43, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-D42 -- 2012 DP8
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-D41 & 2012-D47 -- 2012 DY13, 2009 DT10
C73Galati Obs. in Romania, 2 in MPEC 2012-D44 -- 2012 CD29, 2012 BJ134
651Grasslands Obs. in Arizona, 1 in MPEC 2012-D43 -- 2012 DQ8
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2012-D43 & 2012-D47 -- 2012 DY13, 2012 DQ8
704LINEAR in New Mexico, 3 in MPEC 2012-D44 -- 2011 WV134, 7358, 1943
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-D42 & 2012-D43 -- 2012 DQ8, 2012 DP8
B28Mandi Obs. in Italy, 2 in MPECs 2012-D43 & 2012-D46 -- 2012 DX13, 2012 DQ8
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2012-D44 & 2012-D45 -- 2012 BY76, 2012 BE86, 2011 HJ7
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2012-D44 -- 2012 CD29
118Modra Obs. in Slovakia, 1 in MPEC 2012-D44 -- 2012 DQ8
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-D50 -- 2012 BR61
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-D49 -- 2012 CG
A24New Millennium Obs. in Italy, 5 in MPECs 2012-D42, 2012-D43, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2012 DP8
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2012-D42, 2012-D44 & 2012-D46 -- 2012 DX13, 2012 DP8, 2002 AW, 313548, 12923
B49Paus Obs. in Spain, 1 in MPEC 2012-D43 -- 2012 DQ8
H23Pear Tree Obs. in Florida, 1 in MPEC 2012-D44 -- 2012 BJ134
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-D44 -- 2012 BT23, 2006 AL8, 29075, 138524
H06.Cristovao Jacques in Brazil via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-D43 -- 2012 DQ8
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2012-D41, 2012-D43 & 2012-D46 -- 2012 DX13, 2012 DQ8, 2009 DT10
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-D46 & 2012-D48 -- 2012 DZ13, 2012 DX13
B04Saint-Barthelemy Obs. in Italy, 3 in MPECs 2012-D43, 2012-D46 & 2012-D48 -- 2012 DZ13, 2012 DX13, 2012 DQ8
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-D42, 2012-D43 & 2012-D47 -- 2012 DY13, 2012 DQ8, 2012 DP8
204Schiaparelli Obs. in Italy, 5 in MPECs 2012-D42, 2012-D43, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2012 DP8
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-D44 -- 2011 CP4, 2010 RJ42
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2012-D44 & 2012-D50 -- 2012 CR45, 2012 BR61, 96631, 276049
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2012-D41, 2012-D42, 2012-D43, 2012-D44, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2012 DP8, 2012 DN, 2012 DG4, 2012 CR45, 2012 CQ36, 2012 CP2, 2012 CA21, 2012 BJ86, 2012 AS10, 2011 FC29, 2009 DT10, 2008 GD, 2007 DF8, 2007 CZ49
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2012-D42, 2012-D43, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2012 DP8
B18Terskol Obs. in Russia, 6 in MPECs 2012-D41, 2012-D42, 2012-D43, 2012-D46, 2012-D47 & 2012-D48 -- 2012 DZ13, 2012 DY13, 2012 DX13, 2012 DQ8, 2012 DP8, 2009 DT10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 DY13JPL Sentry2311206513.0e-08-8.82-8.820JPL: "Analysis based on 44 observations spanning .97178 days (2012-Feb-22.25412 to 2012-Feb-23.2259)." Diameter approximately 0.009 km. from mean, weighted H=28.0.
2012 DXJPL Sentry01042096-2111292.8e-05-5.89-6.340JPL: "Analysis based on 38 observations spanning 2.2539 days (2012-Feb-19.26892 to 2012-Feb-21.52281)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2012 CA21JPL Sentry16242073-207821.7e-05-1.87-1.871JPL: "Analysis based on 69 observations spanning 10.977 days (2012-Feb-12.12022 to 2012-Feb-23.09721)." Diameter approximately 0.470 km. from mean, weighted H=19.3.
NEODyS16242073-207315.14e-06-2.38-2.381NEODyS: "Based on 69 optical observations (of which 3 are rejected as outliers) from 2012-02-12.121 to 2012-02-23.098."
2012 BJ86JPL Sentry1624211214.4e-07-4.90-4.900JPL: "Analysis based on 52 observations spanning 25.009 days (2012-Jan-29.10142 to 2012-Feb-23.11041)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS16242084-208416.05e-09-6.66-6.660NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2012-01-29.102 to 2012-02-23.111."
2011 HJ7JPL Sentry1808R E M O V E DJPL: Risk listing removed at 1757 UTC.

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 23 February '12

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

2359Grabbed MPEC 2012-D49 - 2012 CG - see above
Grabbed MPEC 2012-D50 - 2012 BR61 - see above
2311Noted that JPL Sentry has posted 2012 DY13 as an impact risk - see above
2310Updated Traffic Report
2114Grabbed MPEC 2012-D48 - 2012 DZ13 - see above
2104Grabbed MPEC 2012-D46 - 2012 DX13 - see above
Grabbed MPEC 2012-D47 - 2012 DY13 - see above
1808Noted that JPL Sentry has removed 2011 HJ7 as an impact risk - see above
1624Noted that JPL Sentry has updated its 2012 BJ86 risk assessment - see above
Noted that NEODyS has updated its 2012 BJ86 risk assessment - see above
Noted that JPL Sentry has updated its 2012 CA21 risk assessment - see above
Noted that NEODyS has updated its 2012 CA21 risk assessment - see above
Grabbed MPEC 2012-D44 - Daily Orbit Update - see above
Grabbed MPEC 2012-D45 - 2011 HJ7 - see above
0410Grabbed MPEC 2012-D41 - 2009 DT10 - see above
Grabbed MPEC 2012-D42 - 2012 DP8 - see above
Grabbed MPEC 2012-D43 - 2012 DQ8 - see above
0104Noted that JPL Sentry has updated its 2012 DX risk assessment - see above