Contents  on 20 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 20 April '12

Five objects reported inside ten LD

There are five objects reported within ten lunar distances (LD) of Earth today. 2007 HV4 may be headed away from 5.0 to 6.0 LD, but hasn't been reported observed on an Earth passage that has an uncertainty of +/- 1.748 days. 2012 HN1 is inbound from 5.49 to 5.24 LD, 2012 HE from 8.68 to 7.61 LD, and radar target 2012 GP1 from 9.06 to 8.97 LD. And 2012 GW11 leaves ten LD, moving from 7.11 to 10.25 LD.

Headed our way next, radar target 2012 HM arrives inside ten LD tomorrow, 2012 HQ on April 23rd, and 1992 JD on April 30th.

This report was generated at 1627 UTC with follow-up in today's DOU MPEC for 2012 HQ, 2012 HN, 2012 HM, 2012 HE, 2012 GY11, 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 20 April '12

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 39 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 20 April '12

Minor Planet Electronic Circulars

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


MPEC 2012-H35 - "23:38 UT" - 2012 HG2


MPEC 2012-H34 - "23:36 UT" - 2012 HF2


MPEC 2012-H33 - "23:34 UT" - 2012 HE2


MPEC 2012-H32 - "23:32 UT" - 2012 HD2


MPEC 2012-H31 - "20:34 UT" - 2012 HB2


MPEC 2012-H30 - "19:10 UT" - 2012 HA2


MPEC 2012-H29 - "18:17 UT" - 2012 HY1


<< DOU on 20 Apr. '12 >>  MPEC 2012-H28 - "06:03 UT" - Daily Orbit Update


MPEC 2012-H27 - "02:49 UT" - 2012 HW1

Observers  on 20 April '12

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2012-H27, 2012-H28, 2012-H30 & 2012-H32 -- 2012 HW1, 2012 HQ, 2012 HO, 2012 HN, 2012 HM, 2012 HL, 2012 HK, 2012 HE, 2012 HD2, 2012 HA2, 2012 GY11, 2012 GD5, 2012 GC2, 2012 GA5, 2012 FZ44, 2012 FU62, 2012 FM52, 2012 EY11, 2012 DN14, 2012 DH61, 2012 DG61, 2011 QD48, 2004 EN20, 1998 OK1
I27Barred Owl Obs., 1 in MPEC 2012-H28 -- 2012 HM
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2012-H27, 2012-H28, 2012-H30, 2012-H33, 2012-H34 & 2012-H35 -- 2012 HW1, 2012 HG2, 2012 HF2, 2012 HE2, 2012 HA2, 2011 SL102, 2007 UB6, 2006 VY13, 2004 VB, 1994 NK, 36183, 317643, 138095
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2012-H28, 2012-H29 & 2012-H32 -- 2012 HY1, 2012 HQ, 2012 HL, 2012 HD2, 2012 GB18, 2012 GA12, 2012 FQ52, 2012 FE58, 2012 FD23, 2012 DX32
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2012-H28 -- 2012 FY23, 2011 QD48
821Cordoba Obs. Bosque Alegre Station in Argentina, 2 in MPECs 2012-H27 & 2012-H32 -- 2012 HW1, 2012 HD2
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H29 -- 2012 HY1
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-H32 -- 2012 HD2
J95Great Shefford Obs. in England, 7 in MPECs 2012-H27, 2012-H28, 2012-H30, 2012-H31, 2012-H32 & 2012-H33 -- 2012 HW1, 2012 HM, 2012 HE2, 2012 HE, 2012 HD2, 2012 HB2, 2012 HA2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2012-H27, 2012-H29, 2012-H30 & 2012-H32 -- 2012 HY1, 2012 HW1, 2012 HD2, 2012 HA2
932McCarthy Obs. in Connecticut, 2 in MPEC 2012-H28 -- 2012 HM, 2012 GC2
900Moriyama Obs. in Japan, 1 in MPEC 2012-H35 -- 2012 HG2
474Mt. John Obs. in New Zealand, 11 in MPECs 2012-H27, 2012-H28, 2012-H29, 2012-H30, 2012-H31, 2012-H32, 2012-H33, 2012-H34 & 2012-H35 -- 2012 HY1, 2012 HW1, 2012 HQ, 2012 HL, 2012 HG2, 2012 HF2, 2012 HE2, 2012 HD2, 2012 HB2, 2012 HA2, 2012 EO10
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2012-H28 -- 2009 KL2
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2012-H28, 2012-H30 & 2012-H31 -- 2012 HB2, 2012 HA2, 2012 GX11, 99942, 312473, 212546, 9400, 2368
A24New Millennium Obs. in Italy, 2 in MPECs 2012-H34 & 2012-H35 -- 2012 HG2, 2012 HF2
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-H29 -- 2012 HY1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2012-H28 -- 2012 HM, 2012 GC2, 2012 FY23, 2012 ES14, 2012 DO, 2012 AA11, 2011 YV15, 2006 VY13, 2004 FF29, 1994 NK
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-H27, 2012-H30 & 2012-H32 -- 2012 HW1, 2012 HD2, 2012 HA2
J84South Obs. in England, 1 in MPEC 2012-H28 -- 2012 HM
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2012-H28 & 2012-H32 -- 2012 HD2, 2012 GX11, 2012 FR62, 2012 FN62, 2012 DX32, 234341, 162422, 10636
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2012-H28 & 2012-H32 -- 2012 HD2, 2012 FL35, 2012 FD58, 2012 DN, 2012 DJ4, 2012 DE61, 2012 DA14, 2012 CP2, 2010 CN1
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-H27 -- 2012 HW1
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-H28 -- 2012 FY23
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2012-H28 -- 312942, 263976
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 HQJPL Sentry1626R E M O V E DJPL: Risk listing removed at 0853 UTC.
2012 GA12NEODyS1626R E M O V E D-
2012 DA14JPL Sentry16262020-20831613.2e-04-3.22-3.800JPL: "Analysis based on 181 observations spanning 56.366 days (2012-Feb-23.03431 to 2012-Apr-19.4008)." Diameter approximately 0.046 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 20 April '12

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

2359Grabbed MPEC 2012-H32 - 2012 HD2 - see above
Grabbed MPEC 2012-H33 - 2012 HE2 - see above
Grabbed MPEC 2012-H34 - 2012 HF2 - see above
Grabbed MPEC 2012-H35 - 2012 HG2 - see above
2215Grabbed MPEC 2012-H31 - 2012 HB2 - see above
1930Grabbed MPEC 2012-H30 - 2012 HA2 - see above
1901Grabbed MPEC 2012-H29 - 2012 HY1 - see above
1627Generated Traffic Report
1626Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has removed 2012 GA12 as an impact risk - see above
Noted that JPL Sentry has removed 2012 HQ as an impact risk - see above
Grabbed MPEC 2012-H28 - Daily Orbit Update - see above
0432Grabbed MPEC 2012-H27 - 2012 HW1 - see above