Contents  on 28 September '12

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed 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.

Traffic Report  on 28 September '12

Two objects reported inside ten LD

There are two asteroids reported traveling inside ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, risk-listed 2012 SY49 comes its closest to Earth this time around, reaching 2.61 LD at 0104 UTC, and 2012 SL50 exits Earth's Hill sphere, traveling from 3.38 to 5.35 LD.

Approaching our neighborhood next, newly announced 2012 SJ58 comes inside ten LD tomorrow (a preliminary calculation with some uncertainty) and 2010 JK1 arrives on November 22nd.

This report was updated at 2214 UTC with new discoveries 2012 SJ58 (MPEC) and already departed 2012 SF58 (MPEC). Today's first traffic report was posted at 1527 UTC.


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 28 September '12

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 21 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 28 September '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-S84 - "20:09 UT" - 2012 SJ58


MPEC 2012-S83 - "18:02 UT" - 2012 SH58


MPEC 2012-S82 - "17:59 UT" - 2012 SG58


MPEC 2012-S81 - "17:56 UT" - 2012 SF58


<< DOU on 28 Sept. '12 >>  MPEC 2012-S80 - "06:03 UT" - Daily Orbit Update

Observers  on 28 September '12

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-S82 -- 2012 SG58
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-S80 -- 2012 QP10, 2009 AV, 2007 YZ, 2001 YM2
821Cordoba Obs. Bosque Alegre Station in Argentina, 2 in MPECs 2012-S83 & 2012-S84 -- 2012 SJ58, 2012 SH58
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-S80 -- 2003 UC20
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-S82 -- 2012 SG58
C73Galati Obs. in Romania, 1 in MPEC 2012-S80 -- 276397
J95Great Shefford Obs. in England, 2 in MPECs 2012-S81 & 2012-S82 -- 2012 SG58, 2012 SF58
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-S80 -- 2006 TB, 280136
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2012-S81, 2012-S82, 2012-S83 & 2012-S84 -- 2012 SJ58, 2012 SH58, 2012 SG58, 2012 SF58
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2012-S80 -- 2012 PW, 2008 YU32, 2008 VU4, 4486
071Rhozen Obs. in Bulgaria, 1 in MPEC 2012-S80 -- 87684
G68Sierra Stars Obs. in northern California, 1 in MPEC 2012-S80 -- 2012 RM2
J84South Obs. in England, 1 in MPEC 2012-S80 -- 2012 JS11
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2012-S82, 2012-S83 & 2012-S84 -- 2012 SJ58, 2012 SH58, 2012 SG58
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 September '12

At last check (NEODyS and JPL at 2359 UTC) there was no risk monitoring news to report yet today. Visit the CRT to view activity in the last four weeks and our ephemerides page for a complete list of risk-rated objects under current observation or having recent news.

Chronology  on 28 September '12

Times are UTC for when items were noted or added by The Tracking News.

2214Updated Traffic Report
2019Grabbed MPEC 2012-S84 - 2012 SJ58 - see above
1845Grabbed MPEC 2012-S81 - 2012 SF58 - see above
Grabbed MPEC 2012-S82 - 2012 SG58 - see above
Grabbed MPEC 2012-S83 - 2012 SH58 - see above
1524Grabbed MPEC 2012-S80 - Daily Orbit Update - see above