A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During December 2011

Compiled at 2359 UTC on 31 December 2011

<< November 2011 CRT | CRT Archive Index | January 2012 CRT >>

[ Today's risk monitoring & other observing news | object risks cleared in December | Ephemerides for Active Risk-Rated Objects ]

Missing something? Check the archives for objects not under active observation or recent analysis.

Notes: The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both risk monitors also post a few special objects with impact solutions beyond 100 years. For the latest official risk assessments, and for explanations of terminology and methodology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.
0000NNN000

Object

Risk
Monitor
 A/CC  Noted 
 Time & Day 
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Latest Risk Assessments
2011 YC40JPL Sentry1908 Dec. 312028-205063.4e-06-7.33-7.410Analysis based on 13 observations spanning 1.0493 days (2011-Dec-29.27153 to 2011-Dec-30.32086). Diameter approximately 0.004 km. from mean, weighted H=29.7.
An assessment posting was noted by A/CC on 31 Dec.   -   References: MPEC 2011-Y68
2011 YJ28JPL Sentry2007 Dec. 292022-2110256.6e-08-4.46-4.500Analysis based on 24 observations spanning 1.8321 days (2011-Dec-27.50729 to 2011-Dec-29.33937). Diameter approximately 0.250 km. from mean, weighted H=20.7.
An assessment posting was noted by A/CC on 29 Dec.   -   References: MPEC 2011-Y55
2011 YH28NEODyS1619 Dec. 302015-20901592.04e-07-3.62-3.980Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-12-27.419 to 2011-12-29.353.
JPL Sentry2007 Dec. 292015-21071362.8e-07-3.57-3.940Analysis based on 19 observations spanning 1.9338 days (2011-Dec-27.41812 to 2011-Dec-29.3519). Diameter approximately 0.301 km. from mean, weighted H=20.3.
Assessment postings were noted by A/CC on 29 Dec. & 30 Dec.   -   References: MPEC 2011-Y54
2011 YW10NEODyS1545 Dec. 292022-2084115.28e-08-6.34-6.420Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-12-25.216 to 2011-12-29.108.
JPL Sentry1545 Dec. 292020-2077156.8e-08-6.06-6.650Analysis based on 24 observations spanning 3.8928 days (2011-Dec-25.21483 to 2011-Dec-29.1076). Diameter approximately 0.054 km. from mean, weighted H=24.0.
Assessment postings were noted by A/CC on 27 Dec., 28 Dec. & 29 Dec.   -   References: MPEC 2011-Y39 plus DOUs 2011-Y45 & 2011-Y52
2011 XC2NEODyS1545 Dec. 292033-205631.4e-05-3.58-3.580Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-12-08.199 to 2011-12-28.790.
JPL Sentry1545 Dec. 29205611.4e-05-3.57-3.570Analysis based on 28 observations spanning 20.591 days (2011-Dec-08.19806 to 2011-Dec-28.78949). Diameter approximately 0.086 km. from mean, weighted H=23.0.
Assessment postings were noted by A/CC on 11 Dec., 12 Dec., 14 Dec., 19 Dec., 24 Dec., 25 Dec. & 29 Dec.   -   References: MPEC 2011-X35 plus DOUs 2011-X40, 2011-X42, 2011-Y09, 2011-Y20, 2011-Y22 & 2011-Y52
2011 WN69NEODyS1626 Dec. 12024-202416.4e-09-7.84-7.840Based on 39 optical observations (of which 0 are rejected as outliers) from 2011-11-28.292 to 2011-11-30.998.
JPL Sentry1626 Dec. 12058-210964.0e-06-5.95-6.190Analysis based on 39 observations spanning 2.7061 days (2011-Nov-28.29095 to 2011-Nov-30.99705). Diameter approximately 0.019 km. from mean, weighted H=26.2.
Assessment postings were noted by A/CC on 1 Dec.   -   References: DOU 2011-X03
2011 WQ4NEODyS1653 Dec. 192081-208113.87e-09-9.83-9.830Based on 58 optical observations (of which 1 are rejected as outliers) from 2011-11-18.276 to 2011-11-24.595.
JPL Sentry1653 Dec. 19R E M O V E DRisk listing removed at 0852 UTC 19 Dec.
Assessment postings were noted by A/CC on 19 Dec.   -   References: DOU 2011-Y09
2011 WL2JPL Sentry1619 Dec. 30209815.5e-07-4.46-4.460Analysis based on 176 observations spanning 43.849 days (2011-Nov-16.31883 to 2011-Dec-30.1683). Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS1627 Dec. 28R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 12 Dec., 14 Dec., 24 Dec., 25 Dec., 27 Dec., 28 Dec. & 30 Dec.   -   References: DOUs 2011-X03, 2011-X12, 2011-X24, 2011-X29, 2011-X40, 2011-X42, 2011-X44, 2011-Y20, 2011-Y22, 2011-Y37, 2011-Y45 & 2011-Y58
2011 VG9NEODyS1637 Dec. 92086-208628.12e-07-4.58-4.830Based on 53 optical observations (of which 0 are rejected as outliers) from 2011-11-15.379 to 2011-11-27.483.
JPL Sentry1637 Dec. 92086-210962.3e-06-4.13-4.420Analysis based on 53 observations spanning 12.104 days (2011-Nov-15.37847 to 2011-Nov-27.482057). Diameter approximately 0.120 km. from mean, weighted H=22.2.
Assessment postings were noted by A/CC on 9 Dec.   -   References: DOU 2011-X31
2011 UE305JPL Sentry1619 Dec. 30210914.1e-09-6.76-6.760Analysis based on 68 observations spanning 59.811 days (2011-Oct-30.46441 to 2011-Dec-29.27577). Diameter approximately 0.190 km. from mean, weighted H=21.3.
Assessment postings were noted by A/CC on 1 Dec., 7 Dec., 8 Dec., 19 Dec., 25 Dec., 26 Dec., 27 Dec., 28 Dec. & 30 Dec.   -   References: DOUs 2011-X03, 2011-X28, 2011-X29, 2011-Y09, 2011-Y22, 2011-Y29, 2011-Y37, 2011-Y45 & 2011-Y58
2011 UZ255JPL Sentry1638 Dec. 212066-207222.9e-05-3.75-3.750Analysis based on 97 observations spanning 27.844 days (2011-Oct-30.44574 to 2011-Nov-27.28981). Diameter approximately 0.075 km. from mean, weighted H=23.3.
An assessment posting was noted by A/CC on 21 Dec.   -   References: DOU 2011-Y14
2008 VS4JPL Sentry0634 Dec. 42013-21102626.8e-07-5.53-6.360Analysis based on 10 observations spanning .08330 days (2008-Nov-07.413 to 2008-Nov-07.4963). Diameter approximately 0.050 km. from mean, weighted H=24.2.
An assessment posting was noted by A/CC on 4 Dec.   -   References: no recent MPECs
2005 TM173JPL Sentry0603 Dec. 162012-21101338.3e-07-5.46-6.310Analysis based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743). Diameter approximately 0.051 km. from mean, weighted H=24.1.
An assessment posting was noted by A/CC on 16 Dec.   -   References: no recent MPECs
2002 TZ59NEODyS1635 Dec. 32033-203312.83e-08-5.95-5.950Based on 31 optical observations (of which 1 are rejected as outliers) from 2002-10-04.252 to 2002-10-08.888.
An assessment posting was noted by A/CC on 3 Dec.   -   References: DOU 2011-X18
2001 FB90NEODyS1552 Dec. 162067-206716.05e-11-7.48-7.480Based on 38 optical observations (of which 4 are rejected as outliers) from 2001-03-17.300 to 2001-03-28.821.
An assessment posting was noted by A/CC on 16 Dec.   -   References: no recent MPECs
1979 XBNEODyS1522 Dec. 102056-208623.65e-07-3.16-3.230Based on 18 optical observations (of which 1 are rejected as outliers) from 1979-12-11.511 to 1979-12-15.430.
An assessment posting was noted by A/CC on 10 Dec.   -   References: no recent MPECs
C   L   E   A   R   E   D
2011 YAJPL Sentry1800 Dec. 20R E M O V E DRisk listing removed at 0852 UTC 20 Dec.
NEODyS1653 Dec. 19R E M O V E D
Assessment postings were noted by A/CC on 17 Dec., 18 Dec., 19 Dec. & 20 Dec.   -   References: MPEC 2011-Y05 plus DOUs 2011-Y08, 2011-Y09, 2011-Y12, 2011-Y14, 2011-Y17, 2011-Y18, 2011-Y20, 2011-Y22, 2011-Y29, 2011-Y37, 2011-Y45, 2011-Y52 & 2011-Y58
2011 XZ1NEODyS1647 Dec. 26R E M O V E D
JPL Sentry1642 Dec. 18R E M O V E DRisk listing removed at 0851 UTC 18 Dec.
Assessment postings were noted by A/CC on 9 Dec., 10 Dec., 16 Dec., 18 Dec., 19 Dec. & 26 Dec.   -   References: MPEC 2011-X32 plus DOUs 2011-X34, 2011-Y08, 2011-Y09, 2011-Y20, 2011-Y22, 2011-Y29 & 2011-Y45
2011 XM1JPL Sentry1626 Dec. 22R E M O V E DRisk listing removed at 0849 UTC 22 Dec.
Assessment postings were noted by A/CC on 7 Dec. & 22 Dec.   -   References: MPEC 2011-X27 plus DOUs 2011-Y17, 2011-Y18, 2011-Y52 & 2011-Y58
2011 WV95JPL Sentry1615 Dec. 4R E M O V E DRisk listing removed at 0952 UTC 4 Dec.
Assessment postings were noted by A/CC on 1 Dec. & 4 Dec.   -   References: MPEC 2011-X06 plus DOUs 2011-X20, 2011-X24, 2011-X26, 2011-X31, 2011-Y14, 2011-Y17, 2011-Y18, 2011-Y22 & 2011-Y45
2011 WU95JPL Sentry1608 Dec. 8R E M O V E DRisk listing removed at 0851 UTC 8 Dec.
NEODyS1543 Dec. 7R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 5 Dec., 7 Dec. & 8 Dec.   -   References: MPEC 2011-X05 plus DOUs 2011-X24, 2011-X28, 2011-X29, 2011-X31, 2011-Y03, 2011-Y20, 2011-Y45 & 2011-Y52
2011 WS95NEODyS1552 Dec. 16R E M O V E D
JPL Sentry1523 Dec. 6R E M O V E DRisk listing removed at 0850 UTC 6 Dec.
Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 6 Dec. & 16 Dec.   -   References: MPEC 2011-X04 plus DOUs 2011-X26, 2011-Y01, 2011-Y14, 2011-Y17, 2011-Y20, 2011-Y45 & 2011-Y52
2011 WO41JPL Sentry1653 Dec. 19R E M O V E DRisk listing removed at 0850 UTC 19 Dec.
NEODyS1652 Dec. 12R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 4 Dec., 7 Dec., 8 Dec., 12 Dec., 13 Dec. & 19 Dec.   -   References: DOUs 2011-X03, 2011-X20, 2011-X28, 2011-X29, 2011-X40, 2011-X41, 2011-Y09, 2011-Y22 & 2011-Y52
2011 WK15NEODyS1635 Dec. 3R E M O V E D
An assessment posting was noted by A/CC on 3 Dec.   -   References: DOUs 2011-X18, 2011-Y08 & 2011-Y20
2011 UTNEODyS1709 Dec. 15R E M O V E D
JPL Sentry1709 Dec. 15R E M O V E DRisk listing removed at 0850 UTC 15 Dec.
Assessment postings were noted by A/CC on 15 Dec.   -   References: DOU 2011-X44

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

For a list of risk-rated objects currently under observation, see our ephemerides page.

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" for more information.


http://www.HohmannTransfer.com/crt.htm
Publisher information, privacy statement, and disclaimer.
Please report broken links or other problems with this page to <webmaster@hohmanntransfer.com>.
The data and tabular formats on this page are acknowledged as belonging to JPL and NEODyS.
This page is © Copyright 2003-2012 Columbine of Maine - All Rights Reserved
Do NOT copy or mirror this page, but please do link to it. All information here is subject to very frequent (and sometimes critically important) change.
Individuals may make "snapshot" copies for their own private non-commercial use.
CRT updates are flagged by A/CC's RSS news feed (link)