Contents on 16 February '08
- Radar Astrometry -- one object
- IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- four MPECs
- Observers -- fifteen observing facilities
- Impact Risk Monitoring -- seven objects
- Chronology
Resources:
- Consolidated Risk Tables - the CRT page
- Earth's Busy Neighborhood Traffic Report
- Ephemerides for risk-rated and nearby objects
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
The latest A/CC news is available via framed access, 
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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 16 February '08
Radar observation of one object
The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:
Data addition noted at 0105 UTC when the database was dated 15 Feb.
- 153591 2001 SN263 from Arecibo at Feb. 12.03 (range)
- 4450 Pan (1987 SY) from Arecibo at Feb. 13.13 (range)
NEOCP Activity on 16 February '08
The MPC's NEO Confirmation Page has 1 listing: 1 updated
When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of eight objects listed on the NEOCP at some point today.
To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.
New MPECs on 16 February '08
Minor Planet Electronic Circulars
As of last check at 2354 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2008-D01 time-stamped "07:10 UT" - Daily Orbit Update - see below
- MPEC 2008-D02 time-stamped "18:27 UT" - 2008 CB175 - see below
- MPEC 2008-D03 time-stamped "18:30 UT" - 2008 CC175 - see below
- MPEC 2008-D04 time-stamped "21:41 UT" - 2007 DA
MPEC 2008-D04 - "21:41 UT" - 2007 DA
- K07D00A 2007 DA (small asteroid, Earth MOID=7.8 LD, H=22.4 ~112m) from Great Shefford Obs. (Feb. 15.82-85p5 & 16.80-81p3)
MPEC 2008-D03 - "18:30 UT" - 2008 CC175
- K08CH5C 2008 CC175 (H=21.3 ~186m) was discovered at 1013 UT on 14 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 14.36-38p4 and 14.43-44p4. The discovery was confirmed by Great Shefford Obs. (Feb. 16.06-10p4).
MPEC 2008-D02 - "18:27 UT" - 2008 CB175
- K08CH5B 2008 CB175 (small asteroid, H=25.5 ~27m) was discovered at 0641 UT on 14 Feb. by the CSS, which observed it at Feb. 14.28-30p4, 14.34-35p3, and 14.42p4. The discovery was confirmed by Sabino Canyon Obs. (Feb. 14.39-40p3), Great Shefford Obs. (Feb. 15.98-02p3), and Jim Young via Table Mtn. Obs. (Feb. 16.31-34p4).
<< DOU on 16 Feb. '08 >> MPEC 2008-D01 - "07:10 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K08CB8R 2008 CR118 (arc=6 days, H=18.7 ~616m) from Great Shefford Obs. (Feb. 16.12-15p3)
- K08CB6L 2008 CL116 (Q=4.927 AU, arc=6 days, H=20.3 ~295m) from Great Shefford Obs. (Feb. 16.17-18p3)
- K08C71C 2008 CC71 (small asteroid, arc=7 days, H=24.7 ~39m) from Guidestar Obs. (Feb. 16.09-11p3) and Great Shefford Obs. (Feb. 16.16p2)
- K08C70K 2008 CK70 (small asteroid, arc=5 days, H=25.4 ~28m) from Lumezzane Obs. (Feb. 14.00-01p4)
- K08C06B 2008 CB6 (small asteroid, arc=9 days, H=26.9 ~14m) from Great Shefford Obs. (Feb. 16.03-04p3)
- K08C01S 2008 CS1 (arc=13 days, H=20.3 ~295m) from Great Shefford Obs. (Feb. 16.19p2)
- K08A04F 2008 AF4 (arc=35 days, H=19.7 ~389m) from Hadano Obs. (Feb. 13.59-60p4)
- Observations of recently (no longer) risk-listed objects
- K08C22E 2008 CE22 (small asteroid, arc=7 days, H=26.4 ~18m) from Great Shefford Obs. (Feb. 15.93-94p3)
- K08C21Z 2008 CZ21 (arc=8 days, H=20.4 ~282m) from Great Shefford Obs. (Feb. 15.90-91p3)
- Observations of small asteroids (H>22.0)
- K08C00P 2008 CP (arc=14 days, H=24.1 ~51m) from Great Shefford Obs. (Feb. 15.87-88p3)
- Observations of other objects
- K08C01N 2008 CN1 (arc=14 days, H=20.7 ~245m) from Hadano Obs. (Feb. 13.66-67p7), Stia Obs. (Feb. 14.92-93p5), and Guidestar Obs. (Feb. 16.04-07p3)
- K08C01L 2008 CL1 (arc=13 days, H=19.2 ~490m) from Hadano Obs. (Feb. 13.76-77p6), Lumezzane Obs. (Feb. 14.07p4), and Stia Obs. (Feb. 14.94-96p4)
- K08C00H 2008 CH (arc=15 days, H=20.4 ~282m) from Guidestar Obs. (Feb. 16.05-07p3)
- K08B16P 2008 BP16 (q=0.290 AU, arc=17 days, H=21.7 ~155m) from Inastars Obs. (Feb. 16.04-05p4)
- K08A00E 2008 AE (arc=2 opp, H=19.7 ~389m) from Hadano Obs. (Feb. 13.72-74p6)
- K07Y00Z 2007 YZ (arc=25 days, H=19.6 ~407m) from Miyaki-Argenteus Obs. (Dec. 19.60p5)
- K07Y00K 2007 YK (arc=2 opp, H=17.6 ~1.02 km) from Hadano Obs. (Feb. 13.64-65p4) and Stia Obs. (Feb. 14.77-79p3)
- K07T24U 2007 TU24 (arc=125 days, H=20.6 ~257m) from Bisei Spaceguard Center (Bisei) (Jan. 27.42p4) and Hadano Obs. (Feb. 13.70-71p7)
- K07T08G 2007 TG8 (Q=4.305 AU, arc=154 days, H=18.6 ~645m) from Siegen Obs. (Feb. 14.07p3) and Hadano Obs. (Feb. 14.56-58p7)
- K07R09V 2007 RV9 (arc=159 days, H=20.2 ~309m) from Guidestar Obs. (Feb. 16.12-13p4)
- K06J25Y 2006 JY25 (arc=3 opp, H=20.3 ~295m) from Lumezzane Obs. (Feb. 13.88-89p3)
- K06D62U 2006 DU62 (arc=3 opp, H=18.2 ~776m) from the Siding Spring Survey (SSS) (Feb. 15.67-70p3)
- K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from Bisei (Feb. 3.49-50p4), Siegen Obs. (Feb. 12.83-84p2), and Hadano Obs. (Feb. 13.53-54p4)
- K05E70K 2005 EK70 (arc=4 opp, H=17.5 ~1.07 km) from Bisei (Feb. 3.50-51p5), Siegen Obs. (Feb. 12.82p3), and Hadano Obs. (Feb. 14.54p6)
- K05B02E 2005 BE2 (arc=2 opp, H=18.2 ~776m) from Bisei (Feb. 6.63-65p3) and Lumezzane Obs. (Feb. 13.96p4)
- K03A18K 2003 AK18 (arc=3 opp, H=19.7 ~389m) from Lumezzane Obs. (Feb. 14.05-06p4)
- K02C26F 2002 CF26 (arc=5 opp, H=17.2 ~1.23 km) from Lumezzane Obs. (Feb. 13.99-00p4) and Stia Obs. (Feb. 14.89p3)
- H0891 170891 2004 TY16 from Siegen Obs. (Feb. 12.85p3) and Abbeydale Obs. (Feb. 15.85-89p3)
- G2510 162510 2000 QW69 from Lumezzane Obs. (Feb. 14.09p4)
- G2173 162173 1999 JU3 from Bisei (Jan. 27.44-48p5)
- F3591 153591 2001 SN263 from Siegen Obs. (Feb. 11.92p3), Stia Obs. (Feb. 14.74-75p4), and Abbeydale Obs. (Feb. 15.84-85p3)
- F2942 152942 2000 FN10 from Lumezzane Obs. (Feb. 13.95p4)
- E4901 144901 2004 WG1 from Lumezzane Obs. (Feb. 14.01p4)
- 36236 36236 1999 VV from SSS (Feb. 15.45-47p3)
- 22099 22099 2000 EX106 from Inastars Obs. (Feb. 16.00-01p4)
- 04954 4954 Eric (1990 SQ) from Siegen Obs. (Feb. 11.91p3 & 14.01p3)
- 04450 4450 Pan (1987 SY) from Siegen Obs. (Feb. 14.03-04p3)
- 03288 3288 Seleucus (1982 DV) from Siegen Obs. (Feb. 12.88p3)
Observers on 16 February '08
Fifteen observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| J94 | Abbeydale Obs., 2 in MPEC 2008-D01 -- 170891, 153591 |
| 251 | Arecibo in Puerto Rico, 2 in radar -- 153591, 4450 |
| 300 | Bisei Spaceguard Center (Bisei) in Japan, 5 in MPEC 2008-D01 -- 2007 TU24, 2005 TU45, 2005 EK70, 2005 BE2, 162173 |
| 703 | Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2008-D02 & 2008-D03 -- 2008 CC175, 2008 CB175 |
| J95 | Great Shefford Obs. in England, 11 in MPECs 2008-D01, 2008-D02, 2008-D03 & 2008-D04 -- 2008 CZ21, 2008 CS1, 2008 CR118, 2008 CP, 2008 CL116, 2008 CE22, 2008 CC71, 2008 CC175, 2008 CB6, 2008 CB175, 2007 DA |
| A17 | Guidestar Obs. in Germany, 4 in MPEC 2008-D01 -- 2008 CN1, 2008 CH, 2008 CC71, 2007 RV9 |
| 355 | Hadano Obs. in Japan, 9 in MPEC 2008-D01 -- 2008 CN1, 2008 CL1, 2008 AF4, 2008 AE, 2007 YK, 2007 TU24, 2007 TG8, 2005 TU45, 2005 EK70 |
| B15 | Inastars Obs. in Germany, 2 in MPEC 2008-D01 -- 2008 BP16, 22099 |
| 130 | Lumezzane Obs. in Italy, 9 in MPEC 2008-D01 -- 2008 CL1, 2008 CK70, 2006 JY25, 2005 BE2, 2003 AK18, 2002 CF26, 162510, 152942, 144901 |
| D62 | Miyaki-Argenteus Obs. in Japan, 1 in MPEC 2008-D01 -- 2007 YZ |
| 854 | Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-D02 -- 2008 CB175 |
| E12 | Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-D01 -- 2006 DU62, 36236 |
| 510 | Siegen Obs. in Germany, 8 in MPEC 2008-D01 -- 2007 TG8, 2005 TU45, 2005 EK70, 170891, 153591, 4954, 4450, 3288 |
| A78 | Stia Obs. in Italy, 5 in MPEC 2008-D01 -- 2008 CN1, 2008 CL1, 2007 YK, 2002 CF26, 153591 |
| 6735 | Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-D02 -- 2008 CB175 |
Impact Risk Monitoring on 16 February '08
| 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 |
| 2008 CR118 | JPL Sentry | 1632 | 2019 | 1 | 2.6e-10 | -6.20 | -6.20 | 0 | JPL: "Analysis based on 12 observations spanning 5.7948 days (2008-Feb-10.3515 to 2008-Feb-16.14628)." Diameter approximately 0.550 km. from mean, weighted H=19.0. |
| NEODyS | 1632 | R E M O V E D | |||||||
| 2008 CL116 | NEODyS | 1633 | 2026-2089 | 10 | 8.59e-08 | -4.70 | -4.90 | 0 | NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2008/02/10.407 to 2008/02/16.180." |
| JPL Sentry | 1632 | 2035-2107 | 10 | 1.7e-07 | -4.43 | -4.86 | 0 | JPL: "Analysis based on 50 observations spanning 5.7725 days (2008-Feb-10.40671 to 2008-Feb-16.17923)." Diameter approximately 0.299 km. from mean, weighted H=20.3. | |
| 2008 CC71 | NEODyS | 1633 | 2034-2089 | 36 | 1.07e-04 | -3.97 | -4.13 | 0 | NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2008/02/09.397 to 2008/02/16.162." |
| JPL Sentry | 1632 | 2033-2056 | 9 | 1.7e-05 | -4.56 | -4.76 | 0 | JPL: "Analysis based on 26 observations spanning 6.7648 days (2008-Feb-09.39625 to 2008-Feb-16.16108)." Diameter approximately 0.037 km. from mean, weighted H=24.8. | |
| 2008 CK70 | NEODyS | 1633 | 2030-2032 | 4 | 2.79e-04 | -3.19 | -3.19 | 0 | NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2008/02/09.342 to 2008/02/14.007." |
| JPL Sentry | 1632 | 2030-2031 | 2 | 2.9e-04 | -3.18 | -3.18 | 0 | JPL: "Analysis based on 77 observations spanning 4.6648 days (2008-Feb-09.34106 to 2008-Feb-14.00589)." Diameter approximately 0.031 km. from mean, weighted H=25.2. | |
| 2008 CB6 | JPL Sentry | 1632 | 2093-2107 | 3 | 1.1e-05 | -6.37 | -6.51 | 0 | JPL: "Analysis based on 35 observations spanning 8.7528 days (2008-Feb-07.29202 to 2008-Feb-16.04487)." Diameter approximately 0.013 km. from mean, weighted H=27.1. |
| NEODyS | 1632 | 2066-2087 | 2 | 4.73e-08 | -8.58 | -8.83 | 0 | NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2008/02/07.293 to 2008/02/16.046." | |
| 2008 CS1 | JPL Sentry | 1632 | R E M O V E D | JPL: Risk listing removed at 1150 UTC. | |||||
| NEODyS | 1632 | R E M O V E D | |||||||
| 2008 AF4 | NEODyS | 1633 | 2078-2090 | 11 | 1.49e-05 | -2.50 | -2.54 | 1 | NEODyS: "Based on 515 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/13.928. NOTE: The Virtual Impactor in 2089/01/09.483 in the table above is rated as Torino Scale 1." |
| JPL Sentry | 1632 | 2078-2099 | 21 | 2.0e-05 | -2.38 | -2.53 | 1 | JPL: "Analysis based on 511 observations spanning 34.531 days (2008-Jan-10.39652 to 2008-Feb-13.92722)." Diameter approximately 0.390 km. from mean, weighted H=19.7. | |
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 16 February '08
Times are UTC for when items were noted or added by The Tracking News.
| 2157 | Grabbed MPEC 2008-D04 - 2007 DA - see above |
| 1942 | Grabbed MPEC 2008-D02 - 2008 CB175 - see above Grabbed MPEC 2008-D03 - 2008 CC175 - see above |
| 1633 | Noted that NEODyS has updated its 2008 AF4 risk assessment - see above Noted that NEODyS has updated its 2008 CC71 risk assessment - see above Noted that NEODyS has updated its 2008 CK70 risk assessment - see above Noted that NEODyS has updated its 2008 CL116 risk assessment - see above |
| 1632 | Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above Noted that JPL Sentry has updated its 2008 CB6 risk assessment - see above Noted that NEODyS has updated its 2008 CB6 risk assessment - see above Noted that JPL Sentry has updated its 2008 CC71 risk assessment - see above Noted that JPL Sentry has updated its 2008 CK70 risk assessment - see above Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above Noted that JPL Sentry has updated its 2008 CR118 risk assessment - see above Noted that NEODyS has removed 2008 CR118 as an impact risk - see above Noted that JPL Sentry has removed 2008 CS1 as an impact risk - see above Noted that NEODyS has removed 2008 CS1 as an impact risk - see above Grabbed MPEC 2008-D01 - Daily Orbit Update - see above |
| 0105 | Noted Radar Astrometry database addition - see above |
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