Contents on 17 January '08
- Radar Astrometry -- one object
- IAU Minor Planet Center
- NEOCP Activity -- seven listings: 7 updated
- New MPECs -- two MPECs
- Observers -- thirteen observing facilities
- Impact Risk Monitoring -- five objects
- Chronology
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- Ephemerides for risk-rated and nearby objects
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Radar Astrometry on 17 January '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 0600 UTC when the database was dated 16 Jan.
- 2005 WJ56 from Arecibo at Jan. 9.09 (range), 10.04 (velocity), 10.05 (range), 11.04 (velocity) & 11.04 (range) - see 2005 WJ56 Planning
NEOCP Activity on 17 January '08
The MPC's NEO Confirmation Page has 7 listings: 7 updated
When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven updated listings. Of these, five were "one nighters." The Tracking News counted a total of nine objects listed on the NEOCP at some point on this day.
New MPECs on 17 January '08
Minor Planet Electronic Circulars
There were two MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2008-B12 time-stamped "07:09 UT" - Daily Orbit Update - see below
- MPEC 2008-B13 time-stamped "17:22 UT" - 2008 BC
MPEC 2008-B13 - "17:22 UT" - 2008 BC
- K08B00C 2008 BC (small asteroid, Earth MOID=4.2 LD, H=24.2 ~49m) was discovered at 0757 UT on 16 Jan. by the Mt. Lemmon Survey (MLS), which observed it at Jan. 16.33-38p6 and 17.37p8. The discovery was confirmed by Astronomical Research Obs. (ARO) (Jan. 16.38-41p7). This object was within ten lunar distances (LD) of Earth, reaching 9.1 LD on 15 Jan.
<< DOU on 17 Jan. '08 >> MPEC 2008-B12 - "07:09 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K08A33N 2008 AN33 (Q=5.120 AU, arc=1 day, H=18.8 ~589m) from ARO (Jan. 16.39-41p3) and Junk Bond Obs. (Jan. 16.50-54p6)
- K08A33L 2008 AL33 (small asteroid, arc=1 day, H=22.7 ~98m) from ARO (Jan. 16.26-29p3)
- K08A33K 2008 AK33 (arc=1 day, H=20.6 ~257m) from ARO (Jan. 16.04p3) and LINEAR (Jan. 16.14-18p4)
- K08A04F 2008 AF4 (arc=7 days, H=19.6 ~407m) from the Spacewatch 1.8m telescope (Jan. 16.33p3), Hamamatsu-Yuto Obs. (Jan. 16.65-67p4), and Paus Obs. (Jan. 17.02-03p2)
- Observations of small asteroids (H>22.0)
- K08A33P 2008 AP33 (arc=2 days, H=23.9 ~56m) from Great Shefford Obs. (Jan. 16.83-85p2)
- K08A28U 2008 AU28 (arc=5 days, H=24.9 ~35m) from MLS (Jan. 16.15-16p4)
- K08A04G 2008 AG4 (arc=3 days, H=24.7 ~39m) from the Spacewatch 0.9m telescope (Jan. 13.43-45p2)
- K08A03F 2008 AF3 (arc=6 days, H=26.1 ~20m) from Farpoint Obs. (Jan. 13.33p3) and MLS (Jan. 16.55p4)
- K07Y01J 2007 YJ1 (arc=30 days, H=25.3 ~29m) from MLS (Jan. 16.30-32p4 at V=22.6) and Spacewatch 1.8m (Jan. 16.31-32p3)
- K07VI4D 2007 VD184 (arc=65 days, H=23.1 ~81m) from ARO (Jan. 15.35-37p4)
- Observations of almost-small asteroids (21.7<H<=22.0)
- K08A28W 2008 AW28 (arc=4 days, H=21.9 ~141m) from ARO (Jan. 15.29-32p4)
- Observations of other objects
- K08A33M 2008 AM33 (arc=1 day, H=21.3 ~186m) from ARO (Jan. 16.33-35p3)
- K08A33J 2008 AJ33 (Q=5.535 AU, arc=2 days, H=20.0 ~339m) from ARO (Jan. 16.02-03p3)
- K08A28V 2008 AV28 (arc=28 days, H=19.4 ~446m) from Spacewatch 1.8m (Jan. 16.44-45p3)
- K08A28T 2008 AT28 (arc=4 days, H=18.4 ~708m) from Spacewatch 0.9m (Jan. 14.46-49p3)
- K08A04H 2008 AH4 (i=67.0°, arc=6 days, H=21.5 ~170m) from MLS (Jan. 16.56p4)
- K08A00D 2008 AD (arc=15 days, H=20.1 ~323m) from MLS (Jan. 16.15p4)
- K07Y00H 2007 YH (arc=30 days, H=20.1 ~323m) from ARO (Jan. 15.16-17p3)
- K07T08G 2007 TG8 (Q=4.306 AU, arc=125 days, H=18.6 ~645m) from Beaconsfield Obs. (Jan. 16.77p1)
- K06N00M 2006 NM (Q=4.498 AU, arc=2 opp, H=16.3 ~1.86 km) from Spacewatch 0.9m (Jan. 15.23-27p3)
- K06K01T 2006 KT1 (arc=3 opp, H=16.6 ~1.62 km) from Spacewatch 0.9m (Jan. 16.22-25p3)
- K06BE8A 2006 BA148 (arc=2 opp, H=18.5 ~676m) from Spacewatch 0.9m (Jan. 16.46-50p3)
- K05X01D 2005 XD1 (arc=2 opp, H=19.4 ~446m) from Hamamatsu-Yuto Obs. (Jan. 6.61p2)
- K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from Hamamatsu-Yuto Obs. (Jan. 6.67-72p3 & 16.50-54p7) and LINEAR (Jan. 16.15-20p5 & 16.27-32p5)
- K05EM4C 2005 EC224 (arc=4 opp, H=18.1 ~812m) from Spacewatch 0.9m (Jan. 16.40-44p3)
- K04H33K 2004 HK33 (arc=5 opp, H=17.6 ~1.02 km) from Spacewatch 0.9m (Jan. 13.36-40p3)
- K04B58U 2004 BU58 (i=57.2°, arc=4 opp, H=18.1 ~812m) from MLS (Jan. 16.27-29p4)
- K03U19Y 2003 UY19 (arc=2 opp, H=18.6 ~645m) from MLS (Jan. 16.30-31p4)
- K03F00H 2003 FH (arc=5 opp, H=18.9 ~562m) from ARO (Jan. 15.45-47p3 at V=22.1)
- K02J09B 2002 JB9 (i=46.7°, Q=4.852 AU, arc=4 opp, H=15.9 ~2.24 km, q=0.585 AU) from ARO (Jan. 15.41-44p3 at V=22.1-3)
- K02A09E 2002 AE9 (i=37.9°, arc=4 opp, H=18.9 ~562m) from ARO (Jan. 15.49-50p3)
- J99R45M 1999 RM45 (arc=3 opp, H=19.4 ~446m) from Spacewatch 1.8m (Jan. 16.49-50p3)
- J99R28Q 1999 RQ28 (arc=2 opp, H=20.7 ~245m) from Spacewatch 0.9m (Jan. 16.33-37p3)
- J98FD4X 1998 FX134 (arc=3 opp, H=18.6 ~645m) from Spacewatch 0.9m (Jan. 13.43-47p3)
- F3591 153591 2001 SN263 from Hamamatsu-Yuto Obs. (Jan. 16.45-46p5)
- E4411 144411 2004 EW9 from Spacewatch 0.9m (Jan. 14.10-11p3)
- 34613 34613 2000 UR13 from Spacewatch 0.9m (Jan. 16.16-19p3)
- 11405 11405 1999 CV3 from MLS (Jan. 16.53-55p4)
- 11398 11398 1998 YP11 from LINEAR (Jan. 16.28-33p5)
- 03288 3288 Seleucus (1982 DV) from Goodricke-Pigott Obs. (Jan. 16.28-29p2)
Observers on 17 January '08
Thirteen observing facilities appeared in this day's MPECs.
| Code | Observer / observatory |
|---|---|
| 251 | Arecibo in Puerto Rico, 1 in radar -- 2005 WJ56 |
| H55 | Astronomical Research Obs. (ARO) in Illinois, 12 in MPECs 2008-B12 & 2008-B13 -- 2008 BC, 2008 AW28, 2008 AN33, 2008 AM33, 2008 AL33, 2008 AK33, 2008 AJ33, 2007 YH, 2007 VD184, 2003 FH, 2002 JB9, 2002 AE9 |
| J92 | Beaconsfield Obs. in England, 1 in MPEC 2008-B12 -- 2007 TG8 |
| 734 | Farpoint Obs. in Kansas, 1 in MPEC 2008-B12 -- 2008 AF3 |
| 683 | Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-B12 -- 3288 |
| J95 | Great Shefford Obs. in England, 1 in MPEC 2008-B12 -- 2008 AP33 |
| 379 | Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2008-B12 -- 2008 AF4, 2005 XD1, 2005 TU45, 153591 |
| 701 | Junk Bond Obs. in Arizona, 1 in MPEC 2008-B12 -- 2008 AN33 |
| 704 | LINEAR in New Mexico, 3 in MPEC 2008-B12 -- 2008 AK33, 2005 TU45, 11398 |
| G96 | Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-B12 & 2008-B13 -- 2008 BC, 2008 AU28, 2008 AH4, 2008 AF3, 2008 AD, 2007 YJ1, 2004 BU58, 2003 UY19, 11405 |
| B49 | Paus Obs. in Spain, 1 in MPEC 2008-B12 -- 2008 AF4 |
| 691 | Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2008-B12 -- 2008 AT28, 2008 AG4, 2006 NM, 2006 KT1, 2006 BA148, 2005 EC224, 2004 HK33, 1999 RQ28, 1998 FX134, 34613, 144411 |
| 291 | Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2008-B12 -- 2008 AV28, 2008 AF4, 2007 YJ1, 1999 RM45 |
Impact Risk Monitoring on 17 January '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 AN33 | JPL Sentry | 1515 | 2042-2107 | 22 | 9.6e-09 | -5.11 | -6.10 | 0 | JPL: "Analysis based on 27 observations spanning 1.0819 days (2008-Jan-15.4591 to 2008-Jan-16.54096)." Diameter approximately 0.554 km. from mean, weighted H=18.9. |
| NEODyS | 1515 | 2025-2086 | 16 | 4.22e-09 | -5.35 | -6.10 | 0 | NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2008/01/15.460 to 2008/01/16.542." | |
| 2008 AL33 | JPL Sentry | 1515 | 2015-2067 | 7 | 1.6e-09 | -7.12 | -7.40 | 0 | JPL: "Analysis based on 17 observations spanning 1.1304 days (2008-Jan-15.25594 to 2008-Jan-16.38632)." Diameter approximately 0.089 km. from mean, weighted H=22.9. |
| NEODyS | 1515 | 2015-2077 | 13 | 1.05e-09 | -7.29 | -7.35 | 0 | NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/01/15.257 to 2008/01/16.387." | |
| 2008 AK33 | NEODyS | 1557 | 2010-2090 | 275 | 1.43e-06 | -3.02 | -3.66 | 0 | NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/01/15.081 to 2008/01/16.230." |
| JPL Sentry | 1515 | 2010-2107 | 211 | 6.4e-07 | -3.13 | -3.68 | 0 | JPL: "Analysis based on 25 observations spanning 1.1490 days (2008-Jan-15.08003 to 2008-Jan-16.22905)." Diameter approximately 0.281 km. from mean, weighted H=20.4. | |
| 2008 AG33 | NEODyS | 1515 | 2016-2090 | 47 | 2.12e-07 | -3.83 | -5.07 | 0 | NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2008/01/12.510 to 2008/01/16.533." |
| 2008 AF4 | JPL Sentry | 1708 | 2089-2108 | 47 | 2.1e-05 | -2.30 | -2.49 | 1 | JPL: "Analysis based on 83 observations spanning 6.6328 days (2008-Jan-10.39652 to 2008-Jan-17.02932)." Diameter approximately 0.412 km. from mean, weighted H=19.6. |
| NEODyS | 1557 | 2086-2090 | 9 | 1.41e-05 | -2.46 | -2.48 | 1 | NEODyS: "Based on 84 optical observations (of which 1 are rejected as outliers) from 2008/01/10.397 to 2008/01/17.030. NOTE: The Virtual Impactor in 2089/01/09.478 in the table above is rated as Torino Scale 1." | |
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 17 January '08
Times are UTC for when items were noted or added by The Tracking News.
| 1730 | Grabbed MPEC 2008-B13 - 2008 BC - see above |
| 1708 | Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above |
| 1557 | Noted that NEODyS has updated its 2008 AF4 risk assessment - see above |
| 1556 | Noted that NEODyS has posted 2008 AK33 as an impact risk - see above |
| 1515 | Noted that NEODyS has posted 2008 AG33 as an impact risk - see above Noted that JPL Sentry has updated its 2008 AK33 risk assessment - see above Noted that JPL Sentry has updated its 2008 AL33 risk assessment - see above Noted that NEODyS has posted 2008 AL33 as an impact risk - see above Noted that JPL Sentry has updated its 2008 AN33 risk assessment - see above Noted that NEODyS has posted 2008 AN33 as an impact risk - see above Grabbed MPEC 2008-B12 - Daily Orbit Update - see above |
| 0600 | Noted Radar Astrometry database addition |
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