2012-04-23 Tracking News

Contents on 23 April '12

Traffic Report -- nine objects
IAU Minor Planet Center
- NEOCP Activity -- 19 listings
- New MPECs -- six MPECs
Observers -- 22 observers
Impact Risk Monitoring -- two objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page (archive)
Of 457 risk-listed objects, 31 have had news in the last 31 days. Updated at 1648 UTC on 23 April.
Ephemerides for risk-rated & nearby objects + potential mission destinations
News image catalog
News old archive & Small Objects Archive
Object Links - mainly for radar targets & close passers - updated 18 April
Observing Campaigns

The latest A/CC news is available via framed access, 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 April '12

Nine objects reported inside ten LD

There are nine visitors reported traveling within ten lunar distances (LD) of our planet today. Risk-listed 2012 HG2 is outbound from 4.13 to 4.89 LD, 2012 HN1 from 5.52 to 6.03 LD, 2012 HE from 6.96 to 7.50 LD, and radar target 2012 GP1 from 9.15 to 9.41 LD. Unreported 2007 HV4 may be exiting ten LD, moving from 9.1 to 10.8 LD (Earth passage uncertainty = +/- 1.748 days). Radar target 2012 HM is inbound from 7.90 to 6.50 LD and 2012 HE2 from 9.50 to 8.93 LD, and 2012 HQ enters ten LD, moving from 11.41 to 9.89 LD, as does newly announced 2012 HP13, passing from 12.52 to 9.67 LD.

Coming our way next, 1992 JD is calculated with some uncertainty to arrive inside ten LD on April 30th.

This report was updated at 2356 UTC with two new discoveries: approaching 2012 HP13 (MPEC) and departed intruder 2012 HM13 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 HG2, 2012 HM, 2012 GP1, and distant 2007 HA. Today's first traffic report was posted at 1649 UTC.

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 23 April '12

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 26 listings on the NEOCP today.

New MPECs on 23 April '12

Minor Planet Electronic Circulars

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

MPEC 2012-H55 time-stamped "06:03 UT" - Daily Orbit Update - see below
MPEC 2012-H56 time-stamped "16:35 UT" - 2003 WH166 - see below
MPEC 2012-H57 time-stamped "22:03 UT" - 2012 HM13 - see below
MPEC 2012-H58 time-stamped "22:09 UT" - 2012 HN13 - see below
MPEC 2012-H59 time-stamped "22:10 UT" - 2012 HO13 - see below
MPEC 2012-H60 time-stamped "22:12 UT" - 2012 HP13

MPEC 2012-H60 - "22:12 UT" - 2012 HP13

K12H13P 2012 HP13 (Earth MOID=0.3 LD, H=24.1 ~51m, close passer) from the Catalina Sky Survey (CSS) (April 22.46-50p7), Guidestar Obs. (April 22.87-91p5), Modra Obs. (April 23.08-10p5), Sandlot Obs. (April 23.39-40p4), Astronomical Research Obs. Westfield (April 23.41p4), and Bisei Spaceguard Center (April 23.74-75p4)

MPEC 2012-H59 - "22:10 UT" - 2012 HO13

K12H13O 2012 HO13 (small asteroid, i=37.7°, H=23.2 ~78m) from the Spacewatch 1.8m telescope (April 22.28-29p3, 22.35-36p6, 22.41-42p3, 22.46p3, 23.25p3 & 23.36p3), Sandlot Obs. (April 23.23-26p3), and ARO Westfield (April 23.29p3)

MPEC 2012-H58 - "22:09 UT" - 2012 HN13

K12H13N 2012 HN13 (small asteroid, H=22.9 ~89m) from Pan-STARRS 1 (PS1) (April 21.53-56p3), Spacewatch 1.8m (April 22.37p3), Magdalena Ridge Obs. (MRO) (April 22.47-49p4), and Sandlot Obs. (April 23.37-39p2)

MPEC 2012-H57 - "22:03 UT" - 2012 HM13

K12H13M 2012 HM13 (Earth MOID=0.5 LD, i=4.7°, H=28.1 ~8m, close passer) from PS1 (April 21.51-52p2), the Mt. Lemmon Survey (MLS) (April 22.38-39p3), Mt. John Obs. (April 22.47-48p2), and Spacewatch 1.8m (April 23.37p3)

MPEC 2012-H56 - "16:35 UT" - 2003 WH166

K03WG6H 2003 WH166 (borderline-small, Earth MOID=1.8 LD, i=0.7°, H=22.0 ~135m) from LINEAR (April 22.19-22p4), MLS (April 23.16p4), and ARO Westfield (April 23.23-24p3)

<< DOU on 23 Apr. '12 >> MPEC 2012-H55 - "06:03 UT" - Daily Orbit Update

Observations of risk-listed objects
K12H08G 2012 HG8 (Q=4.219 AU, arc=2 days, H=19.8 ~371m) from Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) (April 21.14-15p9) and LINEAR (April 22.23-27p4)
K12H02G 2012 HG2 (small asteroid, arc=2 days, H=27.0 ~13m, close passer) from South Obs. (April 21.89-90p2), Petit Jean Mtn. South Obs. (PJMSO) (April 22.25-26p15), and LINEAR (April 22.34-39p5)
A1955 101955 1999 RQ36 (PMD) from MRO (April 18.30-33p2, 18.38p1, 18.43p1, 21.30-34p2, 21.38p1, 21.42p1, 22.31p1 & 22.36-41p3) and Sandlot Obs. (April 22.30p2)
Observations of recently (no longer) risk-listed objects
K12G12A 2012 GA12 (small asteroid, Q=4.320 AU, arc=7 days, H=22.8 ~93m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (April 22.07-08p3)
Observations of close-passing objects
K12H00M 2012 HM (arc=7 days, H=24.1 ~51m, radar support) from Nonndorf Obs. (April 21.87-89p6 & 21.97-98p6), PJMSO (April 22.31p8), CSS (April 22.38-40p3), and San Marcello Pistoiese Obs. (April 22.86-90p3)
K12G01P 2012 GP1 (arc=11 days, H=26.2 ~19m, radar support) from Spacewatch 1.8m (April 22.47-48p3)
K07H00A 2007 HA (arc=2 opp, H=20.3 ~295m) from Mt. John Obs. (April 20.32-34p4)
Observation campaigns (radar support, potential mission destinations)
J98H03E 1998 HE3 (arc=6 opp, H=21.8 ~148m, radar) from LINEAR (April 22.35-39p5)
-- Potential mission destinations (PMD) list & ephemerides + NHATS -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K12H08K 2012 HK8 (i=36.8°, arc=1 day, H=23.5 ~68m) from LINEAR (April 22.28-33p5)
K12H02R 2012 HR2 (arc=2 days, H=23.1 ~81m) from Holmes/CTIO (April 22.37p2)
K12H02Q 2012 HQ2 (arc=2 days, H=24.1 ~51m) from Holmes/CTIO (April 22.27-28p3)
K12H02F 2012 HF2 (arc=2 days, H=24.6 ~41m) from Mt. John Obs. (April 22.42p4)
K12G11V 2012 GV11 (arc=9 days, H=22.1 ~129m) from Spacewatch 1.8m (April 22.48p2)
K12G02C 2012 GC2 (arc=9 days, H=23.1 ~81m) from Schiaparelli Obs. (April 21.12p5)
K08G02G 2008 GG2 (arc=4 opp, H=22.8 ~93m) from CSS (April 22.32-35p4)
Observations of other asteroidal objects
K12H02O 2012 HO2 (arc=3 days, H=20.4 ~282m) from Holmes/CTIO (April 22.11p3)
K12H01M 2012 HM1 (arc=6 days, H=21.3 ~186m) from MLS (April 22.25-27p4)
K12H01J 2012 HJ1 (arc=6 days, H=17.8 ~933m) from PJMSO (April 22.27-28p6) and Holmes/CTIO (April 22.36-40p6)
K12F35L 2012 FL35 (q=0.375 AU, arc=30 days, H=19.7 ~389m) from CSS (April 22.24-26p4)
K12F23Y 2012 FY23 (arc=31 days, H=20.0 ~339m) from Nonndorf Obs. (April 21.96-00p16), PJMSO (April 22.24-25p10), Desert Moon Obs. (April 22.37p5), and CSS (April 22.43-45p4)
K12F00J 2012 FJ (i=40.1°, arc=37 days, H=18.9 ~562m) from CSS (April 22.46-47p3)
K12A11A 2012 AA11 (arc=99 days, H=20.1 ~323m) from PJMSO (April 22.29-30p6)
K11Y15V 2011 YV15 (Q=4.394 AU, arc=3 opp, H=17.2 ~1.23 km) from PJMSO (April 22.30p5)
K11SA2L 2011 SL102 (arc=3 opp, H=18.2 ~776m) from Mirasteilas Obs. (April 22.82-83p3)
K11Q48D 2011 QD48 (arc=2 opp, H=18.2 ~776m) from PJMSO (April 22.19-20p6)
K10C18G 2010 CG18 (arc=2 opp, H=20.9 ~224m) from Spacewatch 1.8m (April 22.30p3)
K09K02V 2009 KV2 (arc=2 opp, H=19.9 ~355m) from Mt. John Obs. (April 19.34-37p5)
K06V13Y 2006 VY13 (Q=4.718 AU, arc=2 opp, H=17.3 ~1.17 km) from PJMSO (April 22.26-27p5)
K01SQ9Z 2001 SZ269 (arc=3 opp, H=19.6 ~407m) from the Spacewatch 0.9m telescope (April 22.43-46p3)
J99V06P 1999 VP6 (arc=4 opp, H=19.8 ~371m) from Desert Moon Obs. (April 22.42-47p3)
J98H03J 1998 HJ3 (arc=3 opp, H=18.8 ~589m) from MLS (April 22.20-21p4)
J94N00K 1994 NK (arc=2 opp, H=20.0 ~339m) from PJMSO (April 22.28-29p4)
U2830 302830 2003 FB from LINEAR (April 22.29-33p5)
G3000 163000 2001 SW169 from PS1 (April 21.26-27p2)
G2038 162038 1996 DH from PS1 (April 21.25-26p2)
F4555 154555 2003 HA from CSS (April 22.27-28p4)
F2754 152754 1999 GS6 from Mt. John Obs. (April 21.58p3)
E1525 141525 2002 FV5 from CSS (April 22.29-30p3)
89959 89959 2002 NT7 from CSS (April 22.13-14p4)
85839 85839 1998 YO4 from MLS (April 22.18-20p4)
68267 68267 2001 EA16 from Desert Moon Obs. (April 22.26-28p3)
36183 36183 1999 TX16 from CSS (April 22.38-40p4)
06455 6455 1992 HE from DGRO-RH (April 21.15-16p5)

Observers on 23 April '12

A total of 22 observers appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2012-H56, 2012-H59 & 2012-H60 -- 2012 HP13, 2012 HO13, 2003 WH166
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2012-H60 -- 2012 HP13
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2012-H55 & 2012-H60 -- 2012 HP13, 2012 HM, 2012 FY23, 2012 FL35, 2012 FJ, 2008 GG2, 89959, 36183, 154555, 141525
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2012-H55 -- 2012 HR2, 2012 HQ2, 2012 HO2, 2012 HJ1, 2012 GA12
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2012-H55 -- 2012 FY23, 1999 VP6, 68267
`G48`	Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-H55 -- 2012 HG8, 6455
`A17`	Guidestar Obs. in Germany, 1 in MPEC 2012-H60 -- 2012 HP13
`704`	LINEAR in New Mexico, 6 in MPECs 2012-H55 & 2012-H56 -- 2012 HK8, 2012 HG8, 2012 HG2, 2003 WH166, 1998 HE3, 302830
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-H55 & 2012-H58 -- 2012 HN13, 101955
`B67`	Mirasteilas Obs. in Switzerland, 1 in MPEC 2012-H55 -- 2011 SL102
`118`	Modra Obs. in Slovakia, 1 in MPEC 2012-H60 -- 2012 HP13
`474`	Mt. John Obs. in New Zealand, 5 in MPECs 2012-H55 & 2012-H57 -- 2012 HM13, 2012 HF2, 2009 KV2, 2007 HA, 152754
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-H55, 2012-H56 & 2012-H57 -- 2012 HM13, 2012 HM1, 2003 WH166, 1998 HJ3, 85839
`C47`	Nonndorf Obs. in Austria, 2 in MPEC 2012-H55 -- 2012 HM, 2012 FY23
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2012-H55, 2012-H57 & 2012-H58 -- 2012 HN13, 2012 HM13, 163000, 162038
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2012-H55 -- 2012 HM, 2012 HJ1, 2012 HG2, 2012 FY23, 2012 AA11, 2011 YV15, 2011 QD48, 2006 VY13, 1994 NK
`104`	San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-H55 -- 2012 HM
`H36`	Sandlot Obs. in Kansas, 4 in MPECs 2012-H55, 2012-H58, 2012-H59 & 2012-H60 -- 2012 HP13, 2012 HO13, 2012 HN13, 101955
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2012-H55 -- 2012 GC2
`J84`	South Obs. in England, 1 in MPEC 2012-H55 -- 2012 HG2
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-H55 -- 2001 SZ269
`291`	Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-H55, 2012-H57, 2012-H58 & 2012-H59 -- 2012 HO13, 2012 HN13, 2012 HM13, 2012 GV11, 2012 GP1, 2010 CG18

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 23 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 HG8	JPL Sentry	1648	2022-2066	24	1.6e-06	-2.66	-2.94	0	JPL: "Analysis based on 84 observations spanning 2.1091 days (2012-Apr-20.25484 to 2012-Apr-22.36394)." Diameter approximately 0.376 km. from mean, weighted H=19.8.
2012 HG8	NEODyS	1648	2023-2059	18	8.57e-07	-2.79	-3.02	0	NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2012-04-20.256 to 2012-04-22.365."

2012 HG2	JPL Sentry	1648	2053-2060	9	1.1e-04	-5.07	-5.67	0	JPL: "Analysis based on 88 observations spanning 2.0152 days (2012-Apr-20.37147 to 2012-Apr-22.38666)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
2012 HG2	NEODyS	1648	2053-2090	279	9.61e-04	-4.21	-5.13	0	NEODyS: "Based on 88 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-04-22.387."

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 April '12

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

2356	Updated Traffic Report
2304	Grabbed MPEC 2012-H58 - 2012 HN13 - see above Grabbed MPEC 2012-H59 - 2012 HO13 - see above Grabbed MPEC 2012-H60 - 2012 HP13 - see above
2207	Grabbed MPEC 2012-H57 - 2012 HM13 - see above
1648	Noted 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 posted 2012 HG8 as an impact risk - see above Grabbed MPEC 2012-H55 - Daily Orbit Update - see above Grabbed MPEC 2012-H56 - 2003 WH166 - see above

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