Contents  on 28 January '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 January '11

The MPC's NEO Confirmation Page has 10 listings: 3 new, 7 updated

When last checked at 2305 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and seven updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of eighteen listings on the NEOCP at some point 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 January '11

Minor Planet Electronic Circulars

As of last check at 2305 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-B54 - "22:59 UT" - 2011 BF24


MPEC 2011-B53 - "22:24 UT" - 2011 BE24


MPEC 2011-B52 - "11:59 UT" - 2011 BB19


MPEC 2011-B51 - "11:41 UT" - 2011 BA19


MPEC 2011-B50 - "11:21 UT" - 2011 BZ18


MPEC 2011-B49 - "11:15 UT" - 2011 BY18


MPEC 2011-B48 - "11:10 UT" - 2011 BX18


MPEC 2011-B47 - "09:23 UT" - 2011 BW18


<< DOU on 28 Jan. '11 >>  MPEC 2011-B46 - "07:08 UT" - Daily Orbit Update

Observers  on 28 January '11

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-B50 & 2011-B53 -- 2011 BZ18, 2011 BE24
160Castelmartini Obs. in Italy, 6 in MPEC 2011-B46 -- 2010 LR68, 2000 CR101, 85275, 68548, 34613, 175706
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2011-B46, 2011-B49, 2011-B50 & 2011-B53 -- 2011 BZ18, 2011 BY18, 2011 BE24, 2011 AL24, 2011 AA37, 2004 YZ23, 2003 YS117, 86324, 256670, 250614, 162781, 137084, 12923, 2202
G58Chabot Obs. in northern California, 1 in MPEC 2011-B46 -- 2011 BW11
I19El Gato Gris Obs. in Argentina, 2 in MPECs 2011-B49 & 2011-B50 -- 2011 BZ18, 2011 BY18
F65%T. Lister via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-B46 -- 2011 BT15
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-B46 -- 2007 CA27, 96590
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-B46 -- 86324
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 10 in MPECs 2011-B46, 2011-B49 & 2011-B54 -- 2011 BY18, 2011 BX10, 2011 BW11, 2011 BV11, 2011 BT15, 2011 BF24, 2011 BA12, 2011 AX22, 2010 XW58, 2007 TL23
704LINEAR in New Mexico, 12 in MPEC 2011-B46 -- 2011 AM24, 2010 YB, 2010 WQ7, 2010 LR68, 2002 OS4, 2000 CR101, 262623, 243025, 175706, 154589, 152889, 2212
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2011-B47, 2011-B48, 2011-B49, 2011-B50, 2011-B51, 2011-B52, 2011-B53 & 2011-B54 -- 2011 BZ18, 2011 BY18, 2011 BX18, 2011 BW18, 2011 BF24, 2011 BE24, 2011 BB19, 2011 BA19
118Modra Obs. in Slovakia, 1 in MPEC 2011-B53 -- 2011 BE24
474Mt. John Obs. in New Zealand, 7 in MPECs 2011-B46 & 2011-B50 -- 2011 BZ18, 2011 BR15, 2011 AO52, 2011 AL24, 2011 AF37, 2010 VX139, 2004 FG1
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2011-B46, 2011-B47, 2011-B48, 2011-B51, 2011-B52 & 2011-B54 -- 2011 BX18, 2011 BW18, 2011 BF24, 2011 BB19, 2011 BA19, 2011 AS26, 2004 BV1, 96315, 19764, 159467, 154589, 153958
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPEC 2011-B46 -- 2011 AO52, 2011 AL24, 2011 AA37
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-B49 & 2011-B50 -- 2011 BZ18, 2011 BY18
H36Sandlot Obs. in Kansas, 3 in MPECs 2011-B48, 2011-B49 & 2011-B50 -- 2011 BZ18, 2011 BY18, 2011 BX18
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-B46 -- 2007 EJ26
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2011-B46 -- 2011 BY10, 145656, 9856
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2011-B46 & 2011-B48 -- 2011 BY11, 2011 BX18, 2011 BX10, 2011 BT15, 2011 BG10, 2011 BA12, 2011 AX22, 2011 AR26, 2011 AL5, 2011 AK37, 2011 AG5, 2004 EM20
611Starkenburg Obs. in Germany, 1 in MPEC 2011-B53 -- 2011 BE24
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-B46 -- 4954
D96Tzec Maun Obs. Moorook in South Australia, 2 in MPEC 2011-B46 -- 2011 AO52, 3288
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2011-B46 -- 2011 AF37, 2007 EJ, 259221, 137052, 111253
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 January '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2305 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 (backup) 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 BY18JPL Sentry15442067-209525.4e-09-5.89-6.080JPL: "Analysis based on 29 observations spanning 1.0820 days (2011-Jan-27.1617 to 2011-Jan-28.24373)." Diameter approximately 0.260 km. from mean, weighted H=20.5.
2011 BX18JPL Sentry15442025-2107291.0e-08-4.36-4.970JPL: "Analysis based on 21 observations spanning 1.9417 days (2011-Jan-26.31025 to 2011-Jan-28.25195)." Diameter approximately 0.844 km. from mean, weighted H=18.0.
2011 BW18JPL Sentry1544206811.8e-10-7.01-7.010JPL: "Analysis based on 19 observations spanning 5.0740 days (2011-Jan-23.14546 to 2011-Jan-28.21948)." Diameter approximately 0.530 km. from mean, weighted H=19.0.
2011 BT15JPL Sentry15442020-21111236.3e-05-2.70-3.040JPL: "Analysis based on 19 observations spanning 3.8428 days (2011-Jan-24.28933 to 2011-Jan-28.13213)." Diameter approximately 0.143 km. from mean, weighted H=21.9.
NEODyS15442027-2090635.01e-05-2.67-2.950NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-01-24.290 to 2011-01-28.133."
2011 BA12JPL Sentry15442079-2110127.1e-06-4.29-4.400JPL: "Analysis based on 29 observations spanning 3.0360 days (2011-Jan-25.1938 to 2011-Jan-28.2298)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS15442079-208025.03e-06-4.41-4.410NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-01-28.231."
2011 BW11NEODyS1544R E M O V E D-
JPL Sentry1544R E M O V E DJPL: Risk listing removed at 1242 UTC.
2011 BV11JPL Sentry15442096-210148.9e-08-6.18-6.520JPL: "Analysis based on 18 observations spanning 2.9323 days (2011-Jan-25.26063 to 2011-Jan-28.19295)." Diameter approximately 0.076 km. from mean, weighted H=23.2.
NEODyS15442087-208717.5e-10-8.19-8.190NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2011-01-25.261 to 2011-01-28.194."
2011 BX10JPL Sentry15442044-210651.0e-07-4.10-4.230JPL: "Analysis based on 41 observations spanning 3.9780 days (2011-Jan-24.13405 to 2011-Jan-28.11202)." Diameter approximately 0.719 km. from mean, weighted H=18.4.
NEODyS15442068-207628.64e-09-4.93-4.940NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2011-01-24.135 to 2011-01-28.113."
2011 BG10JPL Sentry15442051-207441.5e-05-5.34-5.600JPL: "Analysis based on 29 observations spanning 4.1229 days (2011-Jan-23.26948 to 2011-Jan-27.39237)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS15442051-205131.7e-05-5.29-5.550NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2011-01-23.270 to 2011-01-27.393."
2011 AK37JPL Sentry15442057-209721.6e-07-6.98-7.200JPL: "Analysis based on 22 observations spanning 14.101 days (2011-Jan-13.30429 to 2011-Jan-27.40541)." Diameter approximately 0.030 km. from mean, weighted H=25.2.
2011 AX22JPL Sentry15442055-2101171.3e-04-3.78-3.820JPL: "Analysis based on 58 observations spanning 17.877 days (2011-Jan-10.30552 to 2011-Jan-28.18238)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS15442055-2090101.25e-04-3.79-3.830NEODyS: "Based on 58 optical observations (of which 0 are rejected as outliers) from 2011-01-10.306 to 2011-01-28.183."
2011 AG5JPL Sentry15442036-205796.0e-05-2.72-2.900JPL: "Analysis based on 72 observations spanning 20.002 days (2011-Jan-08.2673 to 2011-Jan-28.26882)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS15442036-205795.92e-05-2.72-2.910NEODyS: "Based on 72 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-28.270."
2010 XW58JPL Sentry15442069-2106114.1e-06-5.62-6.040JPL: "Analysis based on 57 observations spanning 47.782 days (2010-Dec-11.47391 to 2011-Jan-28.25545)." Diameter approximately 0.038 km. from mean, weighted H=24.7.
NEODyS15442069-208941.02e-06-6.11-6.190NEODyS: "Based on 58 optical observations (of which 1 are rejected as outliers) from 2010-12-11.475 to 2011-01-28.256."

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 January '11

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

2305Grabbed MPEC 2011-B53 - 2011 BE24 - see above
Grabbed MPEC 2011-B54 - 2011 BF24 - see above
1544Noted that JPL Sentry has updated its 2010 XW58 risk assessment - see above
Noted that NEODyS has updated its 2010 XW58 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AK37 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AX22 risk assessment - see above
Noted that NEODyS has updated its 2011 AX22 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that NEODyS has updated its 2011 BA12 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BG10 risk assessment - see above
Noted that NEODyS has updated its 2011 BG10 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BV11 risk assessment - see above
Noted that NEODyS has updated its 2011 BV11 risk assessment - see above
Noted that JPL Sentry has removed 2011 BW11 as an impact risk - see above
Noted that NEODyS has removed 2011 BW11 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BW18 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BX10 risk assessment - see above
Noted that NEODyS has updated its 2011 BX10 risk assessment - see above
Noted that JPL Sentry has posted 2011 BX18 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BY18 as an impact risk - see above
Grabbed MPEC 2011-B46 - Daily Orbit Update - see above
Grabbed MPEC 2011-B47 - 2011 BW18 - see above
Grabbed MPEC 2011-B48 - 2011 BX18 - see above
Grabbed MPEC 2011-B49 - 2011 BY18 - see above
Grabbed MPEC 2011-B50 - 2011 BZ18 - see above
Grabbed MPEC 2011-B51 - 2011 BA19 - see above
Grabbed MPEC 2011-B52 - 2011 BB19 - see above