Contents  on 26 April '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 26 April '12

Six objects reported inside ten LD

Six objects are reported to be inside ten lunar distances (LD) of our planet today. Radar target 2012 HM moves from 3.75 to 2.50 LD within Earth's Hill sphere, which risk-listed 2012 HP13 enters, traveling from 4.17 to 2.12 LD.

Further away, risk-listed 2012 HG2 is outbound from 6.43 to 7.21 LD and 2012 HN1 from 7.52 to 8.43 LD. And 2012 HE exits ten LD, flying from 9.85 to 11.39 LD, as does 2012 HE2, passing from 9.97 to 11.36 LD.

On approach next, 1992 JD arrives inside ten LD on April 30th and 2010 KK37 on May 15th.

This report was generated at 1543 UTC with follow-up in today's DOU MPEC for 2012 HP13, 2012 HG2, 2012 HM, and 2012 HE.


Notes: Ten times the distance to the Moon (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. 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 26 April '12

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 45 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 26 April '12

Minor Planet Electronic Circulars

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


MPEC 2012-H74 - "20:30 UT" - 2012 HH20


MPEC 2012-H73 - "17:29 UT" - 2012 HD20


MPEC 2012-H72 - "17:27 UT" - 2012 HC20


<< DOU on 26 Apr. '12 >>  MPEC 2012-H71 - "06:03 UT" - Daily Orbit Update

Observers  on 26 April '12

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2012-H71 & 2012-H72 -- 2012 HY1, 2012 HW1, 2012 HP13, 2012 HO8, 2012 HN8, 2012 HM8, 2012 HL, 2012 HJ1, 2012 HH8, 2012 HG8, 2012 HG2, 2012 HF2, 2012 HC20, 2012 HA2, 2012 GK, 2012 FM52, 2012 FB57, 2012 CL2, 2011 QD48, 2008 NU, 2005 AD13
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-H71 -- 5587
160Castelmartini Obs. in Italy, 3 in MPEC 2012-H71 -- 2011 QD48, 163243, 143651
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-H71 & 2012-H72 -- 2012 HC20, 2004 QJ7, 2003 WH166, 1994 NK, 317643, 306595, 6455
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-H71 -- 2012 FR62, 2001 JW2, 1999 VP6, 212359
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-H71 -- 2012 GS5
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-H74 -- 2012 HH20
C73Galati Obs. in Romania, 9 in MPEC 2012-H71 -- 2012 HP13, 2010 LJ14, 2006 VY13, 2003 HB6, 68267, 40263, 322775, 154144, 1620
C40Kuban State Univ. Obs. in Russia, 2 in MPEC 2012-H71 -- 141018, 3352
704LINEAR in New Mexico, 5 in MPEC 2012-H71 -- 2012 HL, 2012 DO, 2002 WP, 163243, 3352
J75La Sagra Obs. in Spain, 1 in MPEC 2012-H71 -- 2012 DX32
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-H71 -- 2011 WK15, 2010 JH87
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2012-H71 & 2012-H73 -- 2012 HP13, 2012 HG8, 2012 HD20, 2012 DX32, 2008 GG2, 2006 QA31, 318450, 189008
I50P2 Obs. in New Mexico, 2 in MPEC 2012-H71 -- 2012 HP13, 2012 HM
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2012-H71 & 2012-H74 -- 2012 HH20, 2012 DO, 66407, 36183, 189008, 152889, 10150
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-H71 -- 2012 HP13, 2012 HM, 2012 HL, 2012 HG8, 2012 FY23, 2011 YV15, 2003 WH166, 2001 SZ269
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-H71 -- 2012 HM
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-H72 & 2012-H73 -- 2012 HD20, 2012 HC20
204Schiaparelli Obs. in Italy, 9 in MPEC 2012-H71 -- 2012 HR2, 2012 HP15, 2012 HP13, 2012 HM, 2012 HL, 2012 HK, 2012 HJ1, 2012 HG2, 2012 HE
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-H71 -- 2012 DX32
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2012-H71 & 2012-H74 -- 2012 HM8, 2012 HL8, 2012 HH20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 April '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 HP13JPL Sentry23592059-2110172.6e-06-5.42-6.170JPL #2 for the day: "Analysis based on 92 observations spanning 2.8759 days (2012-Apr-22.46032 to 2012-Apr-25.336234)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS15422070-2088112.73e-06-5.37-6.020NEODyS: "Based on 97 optical observations (of which 5 are rejected as outliers) from 2012-04-22.461 to 2012-04-25.337."
2012 HM8JPL Sentry15422084-210531.1e-08-7.71-7.960JPL: "Analysis based on 34 observations spanning 3.9038 days (2012-Apr-21.43466 to 2012-Apr-25.33847)." Diameter approximately 0.058 km. from mean, weighted H=23.8.
NEODyS1542R E M O V E D-
2012 HL8JPL Sentry1542207915.0e-09-7.65-7.650JPL: "Analysis based on 19 observations spanning 4.0181 days (2012-Apr-21.36244 to 2012-Apr-25.38054)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2012 HG8JPL Sentry15422030-206242.3e-06-2.38-2.380JPL: "Analysis based on 129 observations spanning 4.9993 days (2012-Apr-20.25484 to 2012-Apr-25.25414)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
NEODyS15422030-203011.22e-06-2.66-2.660NEODyS: "Based on 130 optical observations (of which 1 are rejected as outliers) from 2012-04-20.256 to 2012-04-25.255."
2012 HG2JPL Sentry15422053-205758.5e-05-5.20-5.620JPL: "Analysis based on 120 observations spanning 3.9970 days (2012-Apr-20.37147 to 2012-Apr-24.36845)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS15422053-20902891.37e-03-4.09-4.820NEODyS: "Based on 120 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-04-24.369."
2012 GV17JPL Sentry18022056-210276.0e-09-6.43-6.620JPL: "Analysis based on 28 observations spanning 11.156 days (2012-Apr-14.34248 to 2012-Apr-25.49845)." Diameter approximately 0.200 km. from mean, weighted H=21.2.
2012 DA14JPL Sentry19172020-2083914.6e-04-3.10-3.610JPL: "Analysis based on 183 observations spanning 60.395 days (2012-Feb-23.03431 to 2012-Apr-23.429634)." Diameter approximately 0.045 km. from mean, weighted H=24.4.

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 26 April '12

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

2359Noted that JPL Sentry has updated its 2012 HP13 risk assessment - see above
2049Grabbed MPEC 2012-H74 - 2012 HH20 - see above
1917Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
1802Noted that JPL Sentry has updated its 2012 GV17 risk assessment - see above
1731Grabbed MPEC 2012-H72 - 2012 HC20 - see above
Grabbed MPEC 2012-H73 - 2012 HD20 - see above
1543Generated Traffic Report
1542Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that NEODyS has updated its 2012 HG2 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HG8 risk assessment - see above
Noted that NEODyS has updated its 2012 HG8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HL8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HM8 risk assessment - see above
Noted that NEODyS has removed 2012 HM8 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 HP13 risk assessment - see above
Noted that NEODyS has updated its 2012 HP13 risk assessment - see above
Grabbed MPEC 2012-H71 - Daily Orbit Update - see above