Contents  on 28 June '11

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.

NEOCP Activity  on 28 June '11

The MPC's NEO Confirmation Page has 4 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of ten 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 28 June '11

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 2011-M49 - "13:31 UT" - 2011 MZ2


MPEC 2011-M48 - "13:29 UT" - 2011 MY2


MPEC 2011-M47 - "13:28 UT" - 2011 MX2


MPEC 2011-M46 - "13:26 UT" - 2011 MW2


<< DOU on 28 June '11 >>  MPEC 2011-M45 - "07:06 UT" - Daily Orbit Update

Observers  on 28 June '11

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
7057program code 7 via Apache Point Obs. in New Mexico, 2 in MPEC 2011-M45 -- 2007 TR24, 2007 RL133
E23Arcadia Obs. in New South Wales, 1 in MPEC 2011-M45 -- 2008 TR10
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-M45 -- 2011 ME
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-M45 -- 2011 MD
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2011-M45, 2011-M47 & 2011-M48 -- 2011 MY2, 2011 MX2, 2011 MT, 2011 ML, 2011 MJ, 2011 MF, 2011 MB2, 2011 LL2, 2011 KF9, 2011 KF4
B92Chinon Obs. in France, 1 in MPEC 2011-M45 -- 1036
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 3 in MPEC 2011-M45 -- 2011 LL2, 2011 LA19, 2011 DL19
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-M45 -- 2011 MD
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-M47 -- 2011 MX2
157Frasso Sabino Obs. in Italy, 2 in MPEC 2011-M45 -- 2011 MK, 2011 LD19
203GiaGa Obs. in Italy, 1 in MPEC 2011-M45 -- 2011 JA8
J95Great Shefford Obs. in England, 1 in MPEC 2011-M45 -- 2011 MD
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-M45 -- 2008 TR10
346KNUE Obs., 1 in MPEC 2011-M45 -- 1036
704LINEAR in New Mexico, 1 in MPEC 2011-M45 -- 2011 MK
J87La Canada Obs. in Spain, 1 in MPEC 2011-M48 -- 2011 MY2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-M46 & 2011-M47 -- 2011 MX2, 2011 MW2
118Modra Obs. in Slovakia, 1 in MPEC 2011-M45 -- 2011 MD
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-M45, 2011-M46, 2011-M47, 2011-M48 & 2011-M49 -- 2011 MZ2, 2011 MY2, 2011 MX2, 2011 MW2, 2011 KK15, 2011 GQ65, 2008 TR10
A13Naef Obs. in Switzerland, 1 in MPEC 2011-M45 -- 267759
C47Nonndorf Obs., 1 in MPEC 2011-M45 -- 2011 MD
G50Organ Mesa Obs. in New Mexico, 1 in MPEC 2011-M45 -- 1036
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-M45 -- 2011 KO17, 248590
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-M45 -- 2011 MB2
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-M48 -- 2011 MY2
H36Sandlot Obs. in Kansas, 4 in MPECs 2011-M46, 2011-M47, 2011-M48 & 2011-M49 -- 2011 MZ2, 2011 MY2, 2011 MX2, 2011 MW2
B38Santa Mama Obs. in Italy, 5 in MPEC 2011-M45 -- 2011 LA19, 2011 KP17, 2008 HE, 20086, 2102
204Schiaparelli Obs. in Italy, 3 in MPEC 2011-M45 -- 2011 MD, 2010 XO56, 2009 WW104
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-M45 -- 2011 MB2, 1566
510Siegen Obs. in Germany, 1 in MPEC 2011-M45 -- 2011 MD
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2011-M45, 2011-M46 & 2011-M47 -- 2011 MX2, 2011 MX, 2011 MW2, 2011 MW1, 2011 MV1, 2011 LH21, 2011 KW19, 2011 JK, 2011 AG5, 1998 ME3
A78Stia Obs. in Italy, 3 in MPEC 2011-M45 -- 2011 KP17, 2011 EZ78, 20086
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-M45 -- 2011 MB2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 June '11

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 CLOMON 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
2011 MXJPL Sentry15012070-2092258.7e-05-5.11-5.480JPL: "Analysis based on 24 observations spanning 4.0260 days (2011-Jun-23.32845 to 2011-Jun-27.35447)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS15012059-2085273.04e-05-5.56-5.830NEODyS: "Based on 25 optical observations (of which 2 are rejected as outliers) from 2011-06-23.329 to 2011-06-27.355."
2011 MDJPL Sentry19172068-2111275.3e-04-4.89-5.570JPL: "Analysis based on 455 observations spanning 5.8066 days (2011-Jun-22.26489 to 2011-Jun-28.071481)." Diameter approximately 0.011 km. from mean, weighted H=27.4.
NEODyS15012081-208922.6e-04-5.48-5.510NEODyS: "Based on 469 optical observations (of which 30 are rejected as outliers) from 2011-06-22.266 to 2011-06-28.072."
2011 AG5JPL Sentry17092040-204756.4e-04-1.49-1.501JPL: "Analysis based on 156 observations spanning 170.14 days (2011-Jan-08.2673 to 2011-Jun-27.40326)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS15012040-205389.1e-04-1.35-1.351NEODyS: "Based on 156 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-06-27.404."

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 28 June '11

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

1917Noted that JPL Sentry has updated its 2011 MD risk assessment - see above
1709Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1501Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 MD risk assessment - see above
Noted that JPL Sentry has updated its 2011 MX risk assessment - see above
Noted that NEODyS has updated its 2011 MX risk assessment - see above
Grabbed MPEC 2011-M45 - Daily Orbit Update - see above
Grabbed MPEC 2011-M46 - 2011 MW2 - see above
Grabbed MPEC 2011-M47 - 2011 MX2 - see above
Grabbed MPEC 2011-M48 - 2011 MY2 - see above
Grabbed MPEC 2011-M49 - 2011 MZ2 - see above