Intruder 2011 MD imaged 26 June 2011 UTC from 
RAS Mayhill in New Mexico, (c)copyright Peter Lake.

Peter Lake in Australia imaged tiny intruder 2011 MD streaking past Earth today by using his iPhone to control a telescope at RAS Mayhill in New Mexico. Tomorrow this tiny object will make the fourth closest Earth passage yet observed with telescopes, at 0.05 lunar distance (see JPL and MPC lists for comparison). Image ©copyright 2011 Peter Lake, used with permission.


Contents  on 26 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.

Radar Astrometry  on 26 June '11

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2123 UTC when the database was dated 26 June

NEOCP Activity  on 26 June '11

The MPC's NEO Confirmation Page has 16 listings

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

New MPECs  on 26 June '11

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 26 June '11 >>  MPEC 2011-M38 - "07:06 UT" - Daily Orbit Update

Observers  on 26 June '11

A total of 26 observers appear in today's MPEC.

CodeObserver / observatory
7057program code 7 via Apache Point Obs. in New Mexico, 3 in MPEC 2011-M38 -- 2006 TN, 2005 LZ42, 2005 JU108
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2011-M38 -- 2011 EZ78
G51Byrne Obs., 1 in MPEC 2011-M38 -- 2011 MD
C13Como Obs. in Italy, 1 in MPEC 2011-M38 -- 2008 VH
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-M38 -- 2011 MD
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-M38 -- 2011 MD, 2011 LC19, 2011 KK15, 2001 PD1
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2011 MD
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2011 MD
G92Jarnac Obs. in Arizona, 1 in MPEC 2011-M38 -- 2011 DL19
704LINEAR in New Mexico, 10 in MPEC 2011-M38 -- 2011 MT, 2011 MC, 2011 HO, 2011 FB29, 2011 DL19, 2008 TR10, 2003 BK47, 275714, 163348, 162474
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2011-M38 -- 2011 MD, 2011 AG5
118Modra Obs. in Slovakia, 1 in MPEC 2011-M38 -- 2011 MD
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2011-M38 -- 2011 LD1, 24445, 2061
C27Pallerols Obs. in Spain, 1 in MPEC 2011-M38 -- 2011 EZ78
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-M38 -- 21374
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2011-M38 -- 2011 MD, 2011 EZ78
941Pla D'Arguines Obs. in Spain, 1 in MPEC 2011-M38 -- 2011 MD
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2011-M38 -- 2011 MT, 2011 KW15
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-M38 -- 2011 MD
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-M38 -- 2011 MD
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-M38 -- 1999 JR6
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2011-M38 -- 2011 KW19, 90403, 86067, 281375, 163818, 6063
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2011-M38 -- 2011 MF, 2011 KQ19, 2011 HS, 2011 HE24, 2011 EF15, 2001 BZ39
6734Mike Hicks via Table Mtn. Obs. in southern California, 1 in MPEC 2011-M38 -- 2011 MD
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-M38 -- 2011 DL19
A48Verona Obs. in Italy, 2 in MPEC 2011-M38 -- 2011 MD, 2011 EZ78
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 MXNEODyS16362059-2085253.35e-05-5.51-5.860NEODyS: "Based on 23 optical observations (of which 2 are rejected as outliers) from 2011-06-23.329 to 2011-06-25.408."
2011 MDJPL Sentry21232049-2111652.1e-03-4.41-4.460JPL #2 for the day: "Analysis based on 217 observations spanning 3.8814 days (2011-Jun-22.26489 to 2011-Jun-26.14626)." Diameter approximately 0.008 km. from mean, weighted H=28.2.
NEODyS16362076-208891.58e-04-5.74-6.240NEODyS: "Based on 217 optical observations (of which 13 are rejected as outliers) from 2011-06-22.266 to 2011-06-26.147."
2011 AG5NEODyS16362040-204768.13e-04-1.40-1.41NEODyS: "Based on 149 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-06-25.418."

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 June '11

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

2123Noted that JPL Sentry has updated its 2011 MD risk assessment - see above
Noted Radar Astrometry database update - see above
1636Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 MD risk assessment - see above
Noted that NEODyS has updated its 2011 MD risk assessment - see above
Noted that NEODyS has posted 2011 MX as an impact risk - see above
Grabbed MPEC 2011-M38 - Daily Orbit Update - see above