Contents on 1 June '09
- IAU Minor Planet Center
- NEOCP Activity -- three listings: 3 updated
- New MPECs -- four MPECs
- Observers -- seventeen observing facilities
- Impact Risk Monitoring -- four 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, 
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 1 June '09
The MPC's NEO Confirmation Page has 3 listings: 3 updated
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. So far The Tracking News has counted a total of seven 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 1 June '09
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2009-L01 time-stamped "06:09 UT" - Daily Orbit Update - see below
- MPEC 2009-L02 time-stamped "11:02 UT" - 2009 KT21 - see below
- MPEC 2009-L03 time-stamped "11:05 UT" - 2009 KV21 - see below
- MPEC 2009-L04 time-stamped "12:46 UT" - 2009 LA
MPEC 2009-L04 - "12:46 UT" - 2009 LA
- K09L00A 2009 LA (small asteroid, Earth MOID=2.8 LD, H=26.3 ~19m) was discovered at 0639 UT on 1 June by the Catalina Sky Survey (CSS), which observed it at June 1.28-30p4, 1.34p3, and 1.39-40p3. The discovery was confirmed by Grasslands Obs. (June 1.35-36p3), Magdalena Ridge Obs. (MRO) (June 1.35-37p4), and Sandlot Obs. (June 1.37-38p3). This object is now within ten lunar distances (LD) of Earth, reaching 3.0 LD on 29 May.
MPEC 2009-L03 - "11:05 UT" - 2009 KV21
- K09K21V 2009 KV21 (small asteroid, H=24.6 ~41m) was discovered at 0820 UT on 30 May by the Mt. Lemmon Survey (MLS), which observed it at May 30.35-41p8, 31.30-31p2, and June 1.28-32p6. The discovery was confirmed by Astronomical Research Obs. (ARO) (May 31.24-26p3 & June 1.23p4), Great Shefford Obs. (May 31.98-01p3), and MRO (June 1.31-34p4).
MPEC 2009-L02 - "11:02 UT" - 2009 KT21
- K09K21T 2009 KT21 (risk-listed, H=19.2 ~490m) was discovered at 0723 UT on 29 May by MLS, which observed it at May 29.31-35p7 and June 1.33-35p4. The discovery was confirmed by MRO (May 30.28-31p4 & June 1.30-32p4), the Spacewatch 1.8m telescope (May 30.33-34p2 at V=22.2), and ARO (June 1.19-21p4).
<< DOU on 1 June '09 >> MPEC 2009-L01 - "06:09 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K09K21R 2009 KR21 (small asteroid, arc=1 day, H=26.7 ~15m) from Great Shefford Obs. (May 31.96-97p5)
- K09K02L 2009 KL2 (arc=12 days, H=17.8 ~933m) from Naef Obs. (May 31.92-94p2)
- Observations of recently (no longer) risk-listed objects
- K09K05D 2009 KD5 (arc=6 days, H=18.2 ~776m) from La Sagra Obs. (June 1.13-15p4)
- K09K03E 2009 KE3 (Q=4.545 AU, arc=8 days, H=18.2 ~776m) from El Condor Obs. (June 1.20-21p3)
- K09H73M 2009 HM73 (small asteroid, arc=33 days, H=23.1 ~81m) from Spacewatch 1.8m (May 31.35p3)
- K09H58V 2009 HV58 (i=47.0°, arc=36 days, H=19.6 ~407m) from the Spacewatch 0.9m telescope (May 31.38-39p2)
- Observations of small asteroids (H>22.0)
- K09K08L 2009 KL8 (arc=2 days, H=24.2 ~49m) from Great Shefford Obs. (May 31.90-93p4 & June 1.06p3)
- K09K01Y 2009 KY1 (arc=13 days, H=23.7 ~62m) from ARO (May 31.25-27p4), Spacewatch 0.9m (May 31.37p1), and La Sagra Obs. (June 1.00-02p2)
- K09K00L 2009 KL (arc=14 days, H=23.8 ~59m) from ARO (May 31.23p3)
- K09H21L 2009 HL21 (arc=40 days, H=22.5 ~107m) from Spacewatch 1.8m (May 31.26-27p2)
- Observations of other objects
- K09K07C 2009 KC7 (Q=4.148 AU, arc=4 days, H=19.2 ~490m) from ARO (May 31.31-32p4)
- K09K05E 2009 KE5 (arc=5 days, H=19.6 ~407m) from ARO (May 31.20-21p3)
- K09J02M 2009 JM2 (arc=20 days, H=19.4 ~446m) from El Condor Obs. (June 1.15-16p3)
- K09H51Y 2009 HY51 (arc=38 days, H=20.7 ~245m) from Spacewatch 1.8m (May 31.18-19p3)
- K09B02L 2009 BL2 (arc=133 days, H=19.4 ~446m) from Koschny Obs. (May 30.96p2) and ARO (May 31.18-19p4)
- K02L38T 2002 LT38 (arc=2 opp, H=20.0 ~339m) from El Condor Obs. (June 1.07-10p3)
- L2546 212546 2006 SV19 from Atlante Obs. (May 31.87-88p3)
- K7945 207945 1991 JW from El Condor Obs. (June 1.13-14p3)
- J4386 194386 2001 VG5 from El Condor Obs. (June 1.10-12p4)
- D6617 136617 1994 CC from Beta Orionis Obs. (May 31.96-97p3)
- 99799 99799 2002 LJ3 from Mirasteilas Obs. (May 31.87-89p3)
- 88254 88254 2001 FM129 from MLS (May 31.20-22p4)
- 03988 3988 1986 LA from Leura Obs. (May 17.35-36p4)
- 03552 3552 Don Quixote (1983 SA) from Beta Orionis Obs. (May 31.96p3)
- 03103 3103 Eger (1982 BB) from Koschny Obs. (May 30.97p2)
Observers on 1 June '09
Seventeen observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| H55 | Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2009-L01, 2009-L02 & 2009-L03 -- 2009 KY1, 2009 KV21, 2009 KT21, 2009 KL, 2009 KE5, 2009 KC7, 2009 BL2 |
| J51 | Atlante Obs. in the Canary Islands, 1 in MPEC 2009-L01 -- 212546 |
| I32 | Beta Orionis Obs. in Argentina, 2 in MPEC 2009-L01 -- 136617, 3552 |
| 703 | Catalina Sky Survey in Arizona, 1 in MPEC 2009-L04 -- 2009 LA |
| I21 | El Condor Obs. in Argentina, 5 in MPEC 2009-L01 -- 2009 KE3, 2009 JM2, 2002 LT38, 207945, 194386 |
| 651 | Grasslands Obs. in Arizona, 1 in MPEC 2009-L04 -- 2009 LA |
| J95 | Great Shefford Obs. in England, 3 in MPECs 2009-L01 & 2009-L03 -- 2009 KV21, 2009 KR21, 2009 KL8 |
| B12 | Koschny Obs. in The Netherlands, 2 in MPEC 2009-L01 -- 2009 BL2, 3103 |
| J75 | La Sagra Obs. in Spain, 2 in MPEC 2009-L01 -- 2009 KY1, 2009 KD5 |
| E17 | Leura Obs. in New South Wales, 1 in MPEC 2009-L01 -- 3988 |
| H01 | Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2009-L02, 2009-L03 & 2009-L04 -- 2009 LA, 2009 KV21, 2009 KT21 |
| B67 | Mirasteilas Obs. in Switzerland, 1 in MPEC 2009-L01 -- 99799 |
| G96 | Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2009-L01, 2009-L02 & 2009-L03 -- 2009 KV21, 2009 KT21, 88254 |
| A13 | Naef Obs. in Switzerland, 1 in MPEC 2009-L01 -- 2009 KL2 |
| H36 | Sandlot Obs. in Kansas, 1 in MPEC 2009-L04 -- 2009 LA |
| 691 | Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2009-L01 -- 2009 KY1, 2009 HV58 |
| 291 | Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2009-L01 & 2009-L02 -- 2009 KT21, 2009 HY51, 2009 HM73, 2009 HL21 |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 1 June '09
| 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 |
| 2009 KT21 | JPL Sentry | 1323 | 2019-2108 | 35 | 1.4e-08 | -4.53 | -5.25 | 0 | JPL: "Analysis based on 25 observations spanning 3.0436 days (2009-May-29.30801 to 2009-Jun-01.35163)." Diameter approximately 0.644 km. from mean, weighted H=18.6. |
| 2009 KR21 | JPL Sentry | 1323 | R E M O V E D | JPL #2 for the day: Risk listing removed at 0851 UTC. | |||||
| 2009 KL2 | JPL Sentry | 1323 | R E M O V E D | JPL: Risk listing removed at 0849 UTC. | |||||
| 2009 ED27 | JPL Sentry | 1704 | R E M O V E D | JPL: Risk listing removed at 1647 UTC. | |||||
| NEODyS | 1323 | R E M O V E D | - | ||||||
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 1 June '09
Times are UTC for when items were noted or added by The Tracking News.
| 1704 | Noted that JPL Sentry has removed 2009 ED27 as an impact risk - see above |
| 1323 | Noted that NEODyS has removed 2009 ED27 as an impact risk - see above Noted that JPL Sentry has removed 2009 KL2 as an impact risk - see above Noted that JPL Sentry has removed 2009 KR21 as an impact risk - see above Noted that JPL Sentry has posted 2009 KT21 as an impact risk - see above Grabbed MPEC 2009-L01 - Daily Orbit Update - see above Grabbed MPEC 2009-L02 - 2009 KT21 - see above Grabbed MPEC 2009-L03 - 2009 KV21 - see above Grabbed MPEC 2009-L04 - 2009 LA - see above |
| 0119 | Noted that JPL Sentry has posted 2009 KR21 as an impact risk - see above |
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