Contents on 27 September '12
- Traffic Report -- two objects
- IAU Minor Planet Center
- Observers -- 20 observers
- Impact Risk Monitoring -- three objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 445 risk-listed objects, 14 have had news in the last 30 days. Updated at 1509 UTC on 27 Sept.
- Ephemerides for risk-rated & nearby objects + potential mission destinations
- News image catalog
- News old archive & Small Objects Archive
- Object Links - mainly for radar targets & close passers - updated 14 Sept.
- Observing Campaigns
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.
Traffic Report on 27 September '12
Two objects reported inside ten LD
Two objects are reported traveling inside ten lunar distances (LD) of our planet today. Risk-listed 2012 SY49 enters Earth's Hill sphere, sliding from 4.54 to 2.62 LD, and 2012 SL50 is also inside the sphere, coming its closest to Earth on this passage -- 2.84 LD at 0744 UTC.
Coming our way next, 2010 JK1 arrives inside ten LD on November 22nd.
This report was generated at 1511 UTC with follow-up in today's DOU MPEC for 2012 SL50 and 2012 SY49.
Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
NEOCP Activity on 27 September '12
The MPC's NEO Confirmation Page has 20 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 29 listings on the NEOCP 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 27 September '12
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2012-S78 time-stamped "06:03 UT" - Daily Orbit Update - see below
- MPEC 2012-S79 time-stamped "19:41 UT" - Comet P/2012 S2 (La Sagra)
MPEC 2012-S79 - "19:41 UT" - Comet P/2012 S2 (La Sagra)
- PK12S020 P/2012 S2 (La Sagra) (q=1.379 AU, Q=8.198 AU, TP=2012 Aug. 19.06420 TT) from La Sagra Obs. (Sept. 23.07-09p2 & 23.15-19p9), Cordell-Lorenz Obs. (Sept. 23.34-37p5, 24.39-44p5, 25.41-44p4 & 26.38-42p4), Magdalena Ridge Obs. (MRO) (Sept. 23.35-37p4), Astronomical Research Obs. Westfield (Sept. 23.35-36p4), Sandlot Obs. (Sept. 23.43-44p3), Bisei Spaceguard Center (Sept. 23.78-79p4, 24.77-79p5 & 25.78-79p4), Ceccano Obs. (Sept. 24.02p3), Auger Obs. (Sept. 24.26-27p3 & 25.24-26p3), the Spacewatch 1.8m telescope (Sept. 24.33p3 & 26.34-35p3), Hidetaka Sato via RAS Obs. Mayhill (Sept. 24.33-34p3), Paus Obs. (Sept. 25.06p3), and Great Shefford Obs. (Sept. 25.10-11p3)
- Observations of risk-listed objects
- K12S49Y 2012 SY49 (small asteroid, arc=4 days, H=25.8 ~23m, close passer) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Sept. 26.16-17p4) and McDonald Obs. (Sept. 26.40-41p5)
- K12S20W 2012 SW20 (Q=4.123 AU, arc=8 days, H=19.6 ~407m) from Spacewatch 1.8m (Sept. 26.30p3)
- K12R16U 2012 RU16 (small asteroid, Q=4.018 AU, arc=11 days, H=25.6 ~26m) from Spacewatch 1.8m (Sept. 26.31-32p3)
- Observations of close-passing objects
- K12S50L 2012 SL50 (arc=1 day, H=26.4 ~18m) from Bisei (Sept. 25.65p3)
- Observation campaigns (radar support, potential mission destinations)
- G2911 162911 2001 LL5 (PMD) from the Catalina Sky Survey (CSS) (Sept. 26.15-17p3)
- 10302 10302 1989 ML (PMD) from CSS (Sept. 26.26-28p4)
-- Potential mission destinations list & ephemerides + NHATS
- Observations of small asteroids (H>22.0)
- K12S49Z 2012 SZ49 (arc=4 days, H=22.8 ~93m) from Holmes/CTIO (Sept. 26.02-03p5)
- K12S32J 2012 SJ32 (arc=4 days, H=25.1 ~32m) from Holmes/CTIO (Sept. 26.26-27p3)
- K12S32H 2012 SH32 (arc=4 days, H=22.1 ~129m) from Holmes/CTIO (Sept. 26.05-06p5)
- Observations of other asteroidal objects
- K12S22D 2012 SD22 (arc=7 days, H=20.0 ~339m) from Holmes/CTIO (Sept. 26.08-09p4)
- K12S20V 2012 SV20 (arc=9 days, H=19.9 ~355m) from Spacewatch 1.8m (Sept. 26.40p3)
- K12S09T 2012 ST9 (arc=9 days, H=19.8 ~371m) from Spacewatch 1.8m (Sept. 26.36p3)
- K12S08K 2012 SK8 (arc=10 days, H=20.4 ~282m) from Holmes/CTIO (Sept. 26.30-31p4)
- K12R16V 2012 RV16 (Q=4.644 AU, arc=11 days, H=19.6 ~407m) from the Mt. Lemmon Survey (MLS) (Sept. 26.35-38p4)
- K12Q50E 2012 QE50 (arc=29 days, H=18.9 ~562m) from Bisei (Sept. 26.53-55p2 & 26.68-72p4)
- K12Q49F 2012 QF49 (arc=31 days, H=17.1 ~1.29 km) from Cruz del Sur Obs. (Sept. 26.23-24p3)
- K12Q42F 2012 QF42 (arc=31 days, H=21.6 ~162m) from Spacewatch 1.8m (Sept. 26.40p3)
- K12Q10P 2012 QP10 (arc=2 opp, H=19.5 ~426m) from Holmes/CTIO (Sept. 25.98-99p4)
- K12J11S 2012 JS11 (Q=4.745 AU, arc=135 days, H=20.0 ~339m) from Wiggins Obs. (Sept. 27.19p3)
- K10V65N 2010 VN65 (arc=2 opp, H=20.2 ~309m) from Spacewatch 1.8m (Sept. 26.38-39p2)
- K09D42V 2009 DV42 (arc=4 opp, H=18.7 ~616m) from Holmes/CTIO (Sept. 26.38-40p4)
- K08G03V 2008 GV3 (i=72.9°, arc=3 opp, H=18.4 ~708m) from David Tholen's team on Mauna Kea (Sept. 14.52p2)
- J98S36E 1998 SE36 (arc=5 opp, H=19.5 ~426m) from Pan-STARRS 1 (PS1) (Sept. 26.39-40p2 & 26.51-52p2)
- U3262 303262 2004 RJ84 from CSS (Sept. 26.22-24p3)
- F9635 159635 2002 CZ46 from Cruz del Sur Obs. (Sept. 26.26-29p3)
- 96536 96536 1998 SO10 from PS1 (Sept. 26.53-54p2)
- 66146 66146 1998 TU3 from Holmes/CTIO (Sept. 25.98-99p8)
- 07888 7888 1993 UC from CSS (Sept. 26.26-28p4) and PS1 (Sept. 26.42-43p2)
Observers on 27 September '12
A total of 20 observers appear in today's MPECs.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-S79 -- P/2012 S2|
|I47||Auger Obs. in Argentina, 1 in MPEC 2012-S79 -- P/2012 S2|
|300||Bisei Spaceguard Center in Japan, 3 in MPECs 2012-S78 & 2012-S79 -- 2012 SL50, P/2012 S2, 2012 QE50|
|703||Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-S78 -- 303262, 162911, 10302, 7888|
|470||Ceccano Obs. in Italy, 1 in MPEC 2012-S79 -- P/2012 S2|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-S78 -- 2012 SZ49, 2012 SY49, 2012 SK8, 2012 SJ32, 2012 SH32, 2012 SD22, 2012 QP10, 2009 DV42, 66146|
|850||Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-S79 -- P/2012 S2|
|I39||Cruz del Sur Obs. in Argentina, 2 in MPEC 2012-S78 -- 2012 QF49, 159635|
|J95||Great Shefford Obs. in England, 1 in MPEC 2012-S79 -- P/2012 S2|
|J75||La Sagra Obs. in Spain, 1 in MPEC 2012-S79 -- P/2012 S2|
|H01||Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-S79 -- P/2012 S2|
|5682||David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-S78 -- 2008 GV3|
|711||McDonald Obs. in Texas, 1 in MPEC 2012-S78 -- 2012 SY49|
|G96||Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-S78 -- 2012 RV16|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2012-S78 -- 1998 SE36, 96536, 7888|
|B49||Paus Obs. in Spain, 1 in MPEC 2012-S79 -- P/2012 S2|
|H06|||Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-S79 -- P/2012 S2|
|H36||Sandlot Obs. in Kansas, 1 in MPEC 2012-S79 -- P/2012 S2|
|291||Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2012-S78 & 2012-S79 -- 2012 SW20, 2012 SV20, 2012 ST9, P/2012 S2, 2012 RU16, 2012 QF42, 2010 VN65|
|718||Wiggins Obs. in Utah, 1 in MPEC 2012-S78 -- 2012 JS11|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 27 September '12
Notes for Today's Latest Risk Assessments
|2012 SY49||JPL Sentry||1509||2031-2084||20||1.3e-05||-5.09||-5.46||0||JPL: "Analysis based on 43 observations spanning 4.1465 days (2012-Sep-22.26616 to 2012-Sep-26.412676)." Diameter approximately 0.023 km. from mean, weighted H=25.8.|
|NEODyS||1509||2031-2097||15||1.14e-05||-5.14||-5.37||0||NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2012-09-22.267 to 2012-09-26.413."|
|2012 SW20||NEODyS||1509||R E M O V E D||-|
|2012 RU16||JPL Sentry||1509||2032-2106||5||1.2e-06||-6.47||-6.72||0||JPL: "Analysis based on 54 observations spanning 10.974 days (2012-Sep-15.34955 to 2012-Sep-26.32322)." Diameter approximately 0.025 km. from mean, weighted H=25.6.|
|NEODyS||1509||2036-2099||4||4.63e-07||-6.82||-7.08||0||NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2012-09-15.350 to 2012-09-26.324."|
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 27 September '12
Times are UTC for when items were noted or added by The Tracking News.
|2100||Grabbed MPEC 2012-S79 - Comet P/2012 S2 (La Sagra) - see above|
|1511||Generated Traffic Report|
|1509||Noted that JPL Sentry has updated its 2012 RU16 risk assessment - see above|
Noted that NEODyS has updated its 2012 RU16 risk assessment - see above
Noted that NEODyS has removed 2012 SW20 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 SY49 risk assessment - see above
Noted that NEODyS has updated its 2012 SY49 risk assessment - see above
Grabbed MPEC 2012-S78 - Daily Orbit Update - see above