Contents  on 24 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 24 April '12

Eight objects reported inside ten LD

Eight objects are reported flying within ten lunar distances (LD) of our planet today. Radar target 2012 HM is inbound from 6.50 to 5.11 LD and risk-listed 2012 HP13 from 9.67 to 6.86 LD. Risk-listed 2012 HG2 is outbound from 4.89 to 5.66 LD, 2012 HN1 from 6.03 to 6.71 LD, 2012 HE from 7.50 to 8.51 LD, and radar target 2012 GP1 from 9.41 to 9.78 LD. 2012 HE2 comes its closest to Earth this time around, reaching 8.91 LD at 0632 UTC, and 2012 HQ also comes its closest -- 9.76 LD at 0856 UTC.

Coming toward Earth next, 1992 JD arrives inside ten LD on April 30th and 2010 KK37 on May 15th.

This report was generated at 1444 UTC with follow-up in today's DOU MPEC for 2012 HG2, 2012 HM, and 2012 DA14.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 24 April '12

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 46 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 24 April '12

Minor Planet Electronic Circulars

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


<< DOU on 24 Apr. '12 >>  MPEC 2012-H61 - "06:03 UT" - Daily Orbit Update

Observers  on 24 April '12

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-H61 -- 2003 WH166
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2012-H61 -- 2012 HR2, 2012 HO1, 2012 HN2, 2012 HM8, 2012 HM1, 2012 HL, 2012 HK8, 2012 HK, 2012 HH8, 2012 HG8, 2012 HG2, 2012 HF2, 2012 HA2, 2012 FR35, 2011 QD48
G51Byrne Obs. in southern California, 1 in MPEC 2012-H61 -- 2012 HM
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-H61 -- 2012 HR2, 2012 HO, 85275, 162082
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2012-H61 -- 2012 HR2, 2012 HQ2, 2012 HO8, 2012 HO2, 2012 HG8, 2012 HG2, 2012 HF2
C73Galati Obs. in Romania, 11 in MPEC 2012-H61 -- 2012 HM, 2012 HL, 2012 FY23, 2012 DO, 2001 SZ269, 1994 NK, 85628, 66272, 36183, 318050, 141531
E94Gisborne Obs. in New Zealand, 1 in MPEC 2012-H61 -- 2012 HG8
C40Kuban State Univ. Obs. in Russia, 1 in MPEC 2012-H61 -- 141018
704LINEAR in New Mexico, 2 in MPEC 2012-H61 -- 2001 SZ269, 1998 HE3
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-H61 -- 2009 AL15
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-H61 -- 2012 GV17, 2012 DA14
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2012-H61 -- 2012 HK8, 186822, 175706, 171819, 5587
A24New Millennium Obs. in Italy, 6 in MPEC 2012-H61 -- 89959, 36183, 302830, 154144, 138095, 3103
2614Andrew Lowe in Alberta using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2012-H61 -- 2011 UL21
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2012-H61 -- 66407, 312473, 3352
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2012-H61 -- 2003 WH166
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-H61 -- 2012 HA2
H36Sandlot Obs. in Kansas, 2 in MPEC 2012-H61 -- 2012 HF2, 2012 HA2
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-H61 -- 2012 HO2, 186822
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2012-H61 -- 2012 HO13, 2012 HM8, 2012 HL8, 2012 GV17, 2012 GB18, 2012 EU14, 2005 HA8
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-H61 -- 2012 FY23
G56Walnut Creek Obs. in northern California, 2 in MPEC 2012-H61 -- 2012 HL, 2012 HK
718Wiggins Obs. in Utah, 1 in MPEC 2012-H61 -- 2012 HM
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 April '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 and JPL at 2106 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 HP13NEODyS13282056-2090244.75e-04-2.85-3.110NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2012-04-22.461 to 2012-04-23.751."
JPL Sentry00182056-2092202.9e-04-3.07-3.410JPL: "Analysis based on 29 observations spanning 1.2896 days (2012-Apr-22.46032 to 2012-Apr-23.74997)." Diameter approximately 0.050 km. from mean, weighted H=24.1.
2012 HM8JPL Sentry13282066-210032.1e-06-5.53-5.540JPL: "Analysis based on 22 observations spanning 2.7508 days (2012-Apr-21.43466 to 2012-Apr-24.18546)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
NEODyS13282084-208412.44e-10-9.41-9.410NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2012-04-21.435 to 2012-04-24.186."
2012 HL8JPL Sentry1328207913.0e-08-6.87-6.870JPL: "Analysis based on 14 observations spanning 2.0618 days (2012-Apr-21.36244 to 2012-Apr-23.42421)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2012 HG8JPL Sentry13282023-2066171.6e-06-2.62-2.750JPL: "Analysis based on 94 observations spanning 3.0027 days (2012-Apr-20.25484 to 2012-Apr-23.257586)." Diameter approximately 0.381 km. from mean, weighted H=19.8.
NEODyS13282023-204388.1e-07-2.80-2.870NEODyS: "Based on 95 optical observations (of which 1 are rejected as outliers) from 2012-04-20.256 to 2012-04-23.258."
2012 HG2JPL Sentry13282053-205767.3e-05-5.26-5.600JPL: "Analysis based on 98 observations spanning 3.0225 days (2012-Apr-20.37147 to 2012-Apr-23.393978)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
2012 GV17JPL Sentry13282033-2110432.1e-06-3.71-3.890JPL: "Analysis based on 26 observations spanning 9.0689 days (2012-Apr-14.34248 to 2012-Apr-23.411407)." Diameter approximately 0.200 km. from mean, weighted H=21.1.
NEODyS13282033-2089291.9e-06-3.68-3.810NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2012-04-14.343 to 2012-04-23.412."
2012 DA14JPL Sentry13282020-21091584.2e-04-3.14-3.680JPL: "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.
NEODyS13282020-20901843.37e-04-3.21-3.740NEODyS: "Based on 186 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-04-23.430."

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 24 April '12

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

1444Generated Traffic Report
1328Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that JPL Sentry has updated its 2012 GV17 risk assessment - see above
Noted that NEODyS has updated its 2012 GV17 risk assessment - see above
Noted that JPL Sentry 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 posted 2012 HM8 as an impact risk - see above
Noted that NEODyS has posted 2012 HP13 as an impact risk - see above
Grabbed MPEC 2012-H61 - Daily Orbit Update - see above
0018Noted that JPL Sentry has posted 2012 HP13 as an impact risk - see above