Illustration of Pluto system. 
Credit: NASA, ESA, and A. Feild/STScI.

NASA announced yesterday that a fourth satellite, which it calls "P4" but is officially designated S/2011 (134340) 1, was discovered within the Pluto system by the Hubble Space Telescope last month and confirmed this month. See IAU CBAT CBET 2769 for observation credits and more details. Illustration credit: NASA, ESA, and A. Feild/STScI.

Contents  on 21 July '11


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.

NEOCP Activity  on 21 July '11

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of four 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 21 July '11

Minor Planet Electronic Circulars

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

MPEC 2011-O15 - "12:41 UT" - 2011 OB

<< DOU on 21 July '11 >>  MPEC 2011-O14 - "07:07 UT" - Daily Orbit Update

MPEC 2011-O13 - "00:03 UT" - 2011 OA

Observers  on 21 July '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-O15 -- 2011 OB
I99Blanquita Obs. in Spain, 3 in MPEC 2011-O14 -- 2006 YD, 20086, 7482
I77CEAMIG-REA in Brazil, 1 in MPEC 2011-O15 -- 2011 OB
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2011-O14 & 2011-O15 -- 2011 OB, 2011 ML, 2011 LL2, 2011 JK, 2011 GD62, 2011 FY2, 2007 SP6, 2003 KX16, 18172
G58Chabot Obs. in northern California, 2 in MPEC 2011-O14 -- 53430, 277830
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-O13 -- 2011 OA
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-O13 -- 2011 OA
J95Great Shefford Obs. in England, 1 in MPEC 2011-O13 -- 2011 OA
704LINEAR in New Mexico, 2 in MPECs 2011-O13 & 2011-O14 -- 2011 OA, 219071
A24New Millennium Obs. in Italy, 1 in MPEC 2011-O13 -- 2011 OA
B49Paus Obs. in Spain, 1 in MPEC 2011-O13 -- 2011 OA
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-O13 -- 2011 OA
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-O14 -- 2011 NZ
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-O13 -- 2011 OA
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-O15 -- 2011 OB
A48Verona Obs. in Italy, 3 in MPEC 2011-O14 -- 2011 NY, 2011 JP29, 2008 TR10
718Wiggins Obs. in Utah, 1 in MPEC 2011-O13 -- 2011 OA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 July '11

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 21 July '11

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

1427Grabbed MPEC 2011-O14 - Daily Orbit Update - see above
Grabbed MPEC 2011-O15 - 2011 OB - see above
0018Grabbed MPEC 2011-O13 - 2011 OA - see above