Contents  on 19 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 19 February '12

One object reported inside ten LD

One object is reported moving inside ten lunar distances (LD) of Earth today. 2012 DX travels from 6.9 to 4.6 LD*.

Known to be inbound are risk-listed 2012 CS46 (LD*) and 2012 DZ (LD*), which arrive inside ten LD tomorrow, while 2012 DY (LD*) comes inside ten LD on February 22nd, radar target 2011 CP4 on February 22nd, and 2008 EJ85 on March 4th.

This report was updated at 1820 UTC with new discoveries 2012 DZ (MPEC), 2012 DY (MPEC), and 2012 DX (MPEC). This report was previously updated at 0035 UTC.

Notes: Ten LD has no astronomical significance but is a useful reporting boundary. 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 19 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, eight 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 19 February '12

Minor Planet Electronic Circulars

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

MPEC 2012-D26 - "17:14 UT" - 2008 JZ30

MPEC 2012-D25 - "15:40 UT" - 2012 DZ

MPEC 2012-D24 - "15:38 UT" - 2012 DY

MPEC 2012-D23 - "15:36 UT" - 2012 DX

<< DOU on 19 Feb. '12 >>  MPEC 2012-D22 - "06:03 UT" - Daily Orbit Update

Observers  on 19 February '12

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2012-D22, 2012-D24 & 2012-D26 -- 2012 DY, 2012 CA21, 2012 CA, 2012 BO77, 2012 BL77, 2012 BJ86, 2012 BC124, 2012 AA11, 2011 YW62, 2011 SL102, 2008 JZ30, 99942, 175706
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2012-D22, 2012-D23, 2012-D24 & 2012-D25 -- 2012 DZ, 2012 DY, 2012 DX, 2012 CC17, 2012 BB124, 2011 YV15, 2008 PF1, 2002 RD27, 85990, 32906, 152941, 142563, 141018, 137925, 3352, 3103, 1862
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-D22 -- 237805
J95Great Shefford Obs. in England, 2 in MPEC 2012-D22 -- 2012 CP46, 2012 CA21
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2012-D22 -- 2011 SL102, 141018
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2012-D22 -- 2012 CA21, 2012 BT23, 2012 BN11
168Kourovskaya Obs. in Russia, 8 in MPEC 2012-D22 -- 2011 SL102, 32906, 209924, 16816, 142563, 138524, 101873, 3103
704LINEAR in New Mexico, 4 in MPEC 2012-D22 -- 2012 BT23, 294739, 275792, 1036
A14Les Engarouines Obs. in France, 1 in MPEC 2012-D22 -- 189008
900Moriyama Obs. in Japan, 2 in MPECs 2012-D23 & 2012-D25 -- 2012 DZ, 2012 DX
J93Mt. Tuffley Obs. in England, 4 in MPEC 2012-D22 -- 3554, 3352, 3103, 433
566NEAT's GEODSS Haleakala telescope in Hawaii, 1 in MPEC 2012-D22 -- 162038
A13Naef Obs. in Switzerland, 1 in MPEC 2012-D22 -- 142348
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-D23 -- 2012 DX
204Schiaparelli Obs. in Italy, 8 in MPEC 2012-D22 -- 2012 CC17, 2012 BM77, 2012 BC124, 2012 BB124, 2012 AT22, 2006 CJ, 2006 AL8, 2002 AW
291Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2012-D22 -- 2012 CS, 2012 CP2, 2012 CM29, 2012 CL29, 2012 CL19, 2012 CC29, 2012 BZ76, 2012 BS23, 2012 BJ86, 2012 BJ134, 2011 XS2, 2011 WQ46, 2011 WL69, 2011 VO5, 1995 FJ, 1995 DW1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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.





Notes for Today's Latest Risk Assessments
2012 DZJPL Sentry18002052-210332.9e-09-9.02-9.150JPL: "Analysis based on 12 observations spanning .15222 days (2012-Feb-19.41414 to 2012-Feb-19.56636)." Diameter approximately 0.022 km. from mean, weighted H=26.0.
2012 DXJPL Sentry18322092-2111702.9e-05-5.82-6.680JPL: "Analysis based on 20 observations spanning .35501 days (2012-Feb-19.26892 to 2012-Feb-19.62393)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2012 DNNEODyS17112021-2090152.9e-09-4.52-4.910NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2012-02-16.523 to 2012-02-18.463."
2012 CS46JPL Sentry01082019-21091204.0e-07-7.71-8.450JPL: "Analysis based on 6 observations spanning 1.0036 days (2012-Feb-14.36119 to 2012-Feb-15.364751)." Diameter approximately 0.009 km. from mean, weighted H=27.8.
2012 CQ46JPL Sentry00322040-208431.3e-08-8.66-8.670JPL: "Analysis based on 7 observations spanning 2.0613 days (2012-Feb-13.31124 to 2012-Feb-15.372533)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
2012 CC29NEODyS1711R E M O V E D-
JPL Sentry1711R E M O V E DJPL: Risk listing removed at 0952 UTC.
2012 CA21NEODyS17112043-207839.83e-06-2.08-2.141NEODyS: "Based on 52 optical observations (of which 3 are rejected as outliers) from 2012-02-12.121 to 2012-02-19.112."
2012 BJ86JPL Sentry17112105-211234.8e-07-4.85-4.970JPL: "Analysis based on 45 observations spanning 21.032 days (2012-Jan-29.10142 to 2012-Feb-19.13388)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS1711R E M O V E D-

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 19 February '12

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

1832Noted that JPL Sentry has posted 2012 DX as an impact risk - see above
1820Updated Traffic Report
1800Noted that JPL Sentry has posted 2012 DZ as an impact risk - see above
1740Grabbed MPEC 2012-D26 - 2008 JZ30 - see above
1711Noted that JPL Sentry has updated its 2012 BJ86 risk assessment - see above
Noted that NEODyS has removed 2012 BJ86 as an impact risk - see above
Noted that NEODyS has updated its 2012 CA21 risk assessment - see above
Noted that JPL Sentry has removed 2012 CC29 as an impact risk - see above
Noted that NEODyS has removed 2012 CC29 as an impact risk - see above
Noted that NEODyS has posted 2012 DN as an impact risk - see above
Grabbed MPEC 2012-D22 - Daily Orbit Update - see above
Grabbed MPEC 2012-D23 - 2012 DX - see above
Grabbed MPEC 2012-D24 - 2012 DY - see above
Grabbed MPEC 2012-D25 - 2012 DZ - see above
0108Noted that JPL Sentry has posted 2012 CS46 as an impact risk - see above
0032Noted that JPL Sentry has posted 2012 CQ46 as an impact risk - see above