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Earth's Busy Neighborhood

    ACC's Small Object Report for 24-30 July 2006    

A semi-automated report compiled on 30 July 2006 at 2359 UTC

Seven* small asteroids were reported in the last 168 hours, during which three were newly discovered.
Currently 1,076 NEAs are listed with H>22.0 by JPL and/or the MPC (896 are listed as such by both).
*This week's report also includes one larger asteroid that passed close by early this month.

[ news | objects by size | object index alpha/cross-ref | 48 Hours | viewing | weekly ]
Editor's note:  As asteroids go, "small" is defined as having an absolute magnitude (brightness) calculated at greater than H=22.0, which converts very roughly to a diameter under 135 meters. No matter how close they come to the Earth, the astronomical community does not classify such objects as "potentially hazardous." However, as demonstrated by the mile wide (1.6 km.) Barringer Crater in Arizona, blasted out by a "small" asteroid some 50,000 years ago, there are asteroids too small to be labeled "potentially hazardous" that actually could cause severe local damage. These are sometimes called "Tunguska-class objects" (TCOs), after the 1908 event probably caused by a comet fragment or asteroid too small to be classified today as hazardous but packing enough wallop to flatten a Siberian forest area the size of a large city.
      NEODyS in December 2005 changed its main Risk page to classify "Objects too small to result in heavy damage on the ground" as having "absolute magnitude > 25," which corresponds to perhaps 35 meters wide. And JPL two months earlier started flagging (with a blue background) risk-listed objects of "Estimated diameter 50 meters or less" as "not likely to cause significant damage in the event of an impact, although impact damage does depend heavily upon the specific (and usually unknown) physical properties of the object in question."
      Small asteroids that come close enough to Earth to be seen have significant potential for scientific study today, and for exploration and exploitation in the future. They present a sampling of distant asteroid populations and a few may be remnants of the event that created the Earth-Moon system.
      Some of these objects are discovered while close to Earth moving across the sky quite quickly, when they are called "FMOs" or "VFMOs" (very fast moving objects). The discovery and follow-up tracking of asteroids with H>22.0 represents some of the most difficult and very best observing work being done today by amateur and professional astronomers around the world, and the page you are reading is dedicated to recognizing their ongoing successes.


Small Object News (newest items first) [ object listings | index | 48 Hours | viewing | weekly | top ]

Object Listings -- smallest objects first [ Alpha Index | 48 Hours | top ]
2006 OK3 (K06O03K) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 13 meters per JPL H=27.06, MPC H=27.1 This object was listed from 22 until 23 July 2006 as an impact risk. JPL classifies 2006 OK3 as an Apollo and calculates an Earth MOID of 0.000834 AU (0.32 LD), and reports this object passed Earth at 0.7 lunar distances (LD) on 23 July 2006 at 1044 UT. Observations are reported from the following observatories in MPEC 2006-O37: Mt. Lemmon Survey (MLS) [G96] 2006-07-23 0546-0700, 16 pos. in MPEC 2006-O37, follow-up 2006-07-23 0818-0942, 16 pos. in MPEC 2006-O37, follow-up Farpoint Obs. [734] 2006-07-23 0715-0729, 6 pos. in MPEC 2006-O37, follow-up See also information from the week ending 23 July 2006. 2006 OE10 (K06O10E) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 37 meters per JPL H=24.80, MPC H=24.8 JPL classifies 2006 OE10 as an Amor and calculates an Earth MOID of 0.048004 AU (18.68 LD), and reports this object passed Earth at 18.7 LD on 23 July 2006. Observations are reported from the following observatories in MPECs 2006-O47 and 2006-O53: Siding Spring Survey (SSS) [E12] 2006-07-26 1228-1258, 3 pos. in MPEC 2006-O47, discovery (*) 2006-07-26 1428-1534, 6 pos. in MPEC 2006-O47, confirmation 2006-07-26 1711-1713, 3 pos. in MPEC 2006-O47, confirmation 2006-07-26 1947-1947, 1 pos. in MPEC 2006-O53, follow-up 2006-07-27 1051-1051, 1 pos. in MPEC 2006-O53, follow-up 2006-07-27 1327-1327, 1 pos. in MPEC 2006-O53, follow-up CEAMIG-REA [I77] 2006-07-27 0247-0256, 3 pos. in MPEC 2006-O53, follow-up 2006 OB7 (K06O07B) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 55 meters per JPL H=23.95, MPC H=24.1 JPL classifies 2006 OB7 as an Amor and calculates an Earth MOID of 0.031039 AU (12.08 LD), and reports this object passed Earth at 13.3 LD on 25 July 2006. Observations are reported from the following observatories in MPECs 2006-O40, 2006-O44, and 2006-O63: LINEAR [704] 2006-07-24 0522-0622, 5 pos. in MPEC 2006-O40, discovery (*) Great Shefford Obs. [J95] 2006-07-24 2324-2327, 3 pos. in MPEC 2006-O40, confirmation 2006-07-28 2242-2247, 2 pos. in MPEC 2006-O63, follow-up 2006-07-29 0009-0014, 2 pos. in MPEC 2006-O63, follow-up McCarthy Obs. [932] 2006-07-25 0301-0313, 3 pos. in MPEC 2006-O40, confirmation Farpoint Obs. [734] 2006-07-25 0347-0403, 5 pos. in MPEC 2006-O40, confirmation Mt. Lemmon Survey (MLS) [G96] 2006-07-25 0543-0609, 4 pos. in MPEC 2006-O40, confirmation 1.8m Plaskett Telescope [658{1}] coded to Dave Balam 2006-07-25 0636-0642, 3 pos. in MPEC 2006-O44, follow-up Mt. John Obs. [474] 2006-07-25 0935-0939, 3 pos. in MPEC 2006-O40, confirmation 2006 OY4 (K06O04Y) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 66 meters per JPL H=23.55, MPC H=23.5 JPL classifies 2006 OY4 as an Amor and calculates an Earth MOID of 0.086895 AU (33.81 LD), and reports this object passes Earth at 35.0 LD on 30 July 2006. Lowell Observatory reports 2006 OY4 has an MOID of 0.04333 AU (16.86 LD) with Mars. Observations are reported from the following observatories in MPEC 2006-O49: Siding Spring Survey (SSS) [E12] 2006-07-25 1516-1520, 2 pos. in MPEC 2006-O49, follow-up See also information from the week ending 23 July 2006. 2006 OC7 (K06O07C) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 91 meters per JPL H=22.86, MPC H=22.9 JPL classifies 2006 OC7 as an Amor and calculates an Earth MOID of 0.040830 AU (15.89 LD), and reports this object passed Earth at 18.3 LD on 19 July 2006. Observations are reported from the following observatories in MPECs 2006-O41, 2006-O44, 2006-O49, and 2006-O53: LINEAR [704] 2006-07-24 0525-0629, 5 pos. in MPEC 2006-O41, discovery (*) Great Shefford Obs. [J95] 2006-07-25 0029-0033, 4 pos. in MPEC 2006-O41, confirmation Eschenberg Obs. [151] 2006-07-25 0107-0110, 6 pos. in MPEC 2006-O41, confirmation CEAMIG-REA [I77] 2006-07-25 0130-0133, 3 pos. in MPEC 2006-O41, confirmation McCarthy Obs. [932] 2006-07-25 0439-0445, 3 pos. in MPEC 2006-O41, confirmation Farpoint Obs. [734] 2006-07-25 0456-0510, 4 pos. in MPEC 2006-O41, confirmation Mt. Lemmon Survey (MLS) [G96] 2006-07-25 0842-0843, 2 pos. in MPEC 2006-O41, confirmation Mt. John Obs. [474] 2006-07-25 1042-1047, 3 pos. in MPEC 2006-O44, follow-up San Marcello Pistoiese Obs. [104] 2006-07-25 2203-2211, 3 pos. in MPEC 2006-O49, follow-up Begues Obs. [170] 2006-07-26 2343-2349, 3 pos. in MPEC 2006-O49, follow-up Klet Obs. [046] 2006-07-27 2213-2227, 4 pos. in MPEC 2006-O53, follow-up 2006 CT (K06C00T) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 114 meters per JPL H=22.36, MPC H=22.3 This object was listed from 5 until 22 Feb. 2006 as an impact risk. JPL classifies 2006 CT as an Apollo and calculates an Earth MOID of 0.001707 AU (0.66 LD). Observations are reported from the following observatories in MPEC 2006-O53: Spacewatch 0.9m telescope [691] 1991-01-15 0804-0905, 3 pos. in MPEC 2006-O53, follow-up See also information from the week ending 4 June 2006. 2006 OA1 (K06O01A) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 119 meters per JPL H=22.27, MPC H=22.3 JPL classifies 2006 OA1 as an Apollo and calculates an Earth MOID of 0.099911 AU (38.88 LD). Observations are reported from the following observatories in MPEC 2006-O49: Siding Spring Survey (SSS) [E12] 2006-07-25 1830-1836, 2 pos. in MPEC 2006-O49, follow-up See also information from the week ending 23 July 2006. 2004 XP14 (K04X14P) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 467 meters per JPL H=19.30, MPC H=19.4 -- not small This object was listed from 11 Dec. 2004 until 17 March 2005 as an impact risk. JPL classifies 2004 XP14 as an Apollo and calculates an Earth MOID of 0.002495 AU (0.97 LD), and reports this object passed Earth at 1.1 LD on 3 July 2006 at 0426 UT. Observations are reported from the following observatory in MPEC 2006-O44: Panker Obs. [A32] 2006-07-04 2237-2245, 4 pos. in MPEC 2006-O44, follow-up 2006-07-05 0013-0022, 4 pos. in MPEC 2006-O44, follow-up See also information from the week ending 23 July 2006.
48+120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of seven small objects were reported during the last 168 hours: 2006 CT, 2006 OA1, 2006 OB7, 2006 OC7, 2006 OE10, 2006 OK3 & 2006 OY4, plus 2004 XP14 in MPECs: 2006-O37 time-stamped 2006 July 24, 06:06 UT - Daily Orbit Update 2006-O40 time-stamped 2006 July 25, 10:02 UT - 2006 OB7 2006-O41 time-stamped 2006 July 25, 10:04 UT - 2006 OC7 2006-O44 time-stamped 2006 July 26, 06:06 UT - Daily Orbit Update 2006-O47 time-stamped 2006 July 26, 17:38 UT - 2006 OE10 2006-O49 time-stamped 2006 July 27, 06:07 UT - Daily Orbit Update 2006-O53 time-stamped 2006 July 28, 06:07 UT - Daily Orbit Update 2006-O63 time-stamped 2006 July 29, 06:08 UT - Daily Orbit Update 2006-O65 time-stamped 2006 July 30, 06:07 UT - Daily Orbit Update Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2006 July 29, 1432 UTC JPL NEO Orbital Elements, downloaded at 2006 July 29, 1437 UTC Lowell Observatory Orbit intersections, time-stamped 2006 Jul 30 1250:50 UTC MPC NEA.DAT from MPC mirror, downloaded at 2006 July 29, 1424 UTC Risk monitoring sites, as of A/CC's check at 2006 July 30, 2359 UTC (see CRT page) Some observation sets have MPEC codes in parentheses, such as (*) denoting discovery.
Viewing Opportunities for Small Objects [ news | size order | alpha order | top ]
This compilation shows 12 small objects as being currently in view, including 7 not reported in the last seven days. Viewing by date order - see this list also by designation order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2006 MB 2006-07-31 0.061231 105 22.55 28 - past obs. - (16 July) 2006 KM89 2006-08-01 0.146410 62 23.67 22 - past obs. - (21 June) 2006 OA1 2006-08-09 0.099911 119 22.27 7 - (27 July) 2006 OB7 2006-08-24 0.031039 55 23.95 5 - (29 July) 2006 MH10 2006-09-01 0.124765 122 22.22 23 - past obs. - (16 July) 2006 KK103 2006-09-01 0.139955 110 22.44 50 - past obs. - (16 July) 2006 OC7 2006-09-05 0.040830 91 22.86 4 - (28 July) 1999 LK1 2006-09-11 0.027549 128 22.11 14 - faint recov. poss. - (30 April) 54509 2006-09-15 0.000154 104 22.56 4op - aka 2000 PH5 - past obs. - (26 July) 2006 OE10 2006-09-15 0.048004 37 24.80 1 - (28 July) 2006 OY4 2006-10-03 0.086895 66 23.55 5 - (27 July) 1998 HG49 2006-12-21 0.076404 141 21.91 3op - "only 1 night" - past obs. - (16 July) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2006 OE10 2006-09-15 0.048004 37 24.80 1 - (28 July) 2006 OC7 2006-09-05 0.040830 91 22.86 4 - (28 July) 2006 OB7 2006-08-24 0.031039 55 23.95 5 - (29 July) 2006 OY4 2006-10-03 0.086895 66 23.55 5 - (27 July) 2006 OA1 2006-08-09 0.099911 119 22.27 7 - (27 July) 2006 MH10 2006-09-01 0.124765 122 22.22 23 - past obs. - (16 July) 2006 MB 2006-07-31 0.061231 105 22.55 28 - past obs. - (16 July) 2006 KK103 2006-09-01 0.139955 110 22.44 50 - past obs. - (16 July) 2006 KM89 2006-08-01 0.146410 62 23.67 22 - past obs. - (21 June) 1999 LK1 2006-09-11 0.027549 128 22.11 14 - faint recov. poss. - (30 April) 1998 HG49 2006-12-21 0.076404 141 21.91 3op - "only 1 night" - past obs. - (16 July) 54509 2006-09-15 0.000154 104 22.56 4op - aka 2000 PH5 - past obs. - (26 July) Out-of-view date based on MPES solar elongation <40° and/or magnitude V>22.0 at 1200 UT geocentric. (Not factored in is any lunar interference with viewing.) Objects are linked in the left-most column only if observed in the last seven days, while objects with earlier small-object reporting are linked under "Notes." Diameter ("Dia") is in meters, a very rough estimate from brightness (H). Observing "Arc" is from MPES in days or number of oppositions. "In view" does not necessarily mean locatable for objects with short arcs in prior years and for which a large search or accidental rediscovery are the best hopes.
Small object observation cross index [ size order | 48 Hours | viewing | top ]
ObjectObserved by MPC code
2004 XP14A32
2006 CT691
2006 OA1E12
2006 OB7474, 658, 704, 734, 932, G96, J95
2006 OC7046, 104, 151, 170, 474, 704, 734, 932, G96, I77, J95
2006 OE10E12, I77
2006 OK3734, G96
2006 OY4E12
CodeObservatoryObjects Observed
046Klet Obs. 2006 OC7
104San Marcello Pistoiese Obs. 2006 OC7
151Eschenberg Obs. 2006 OC7
170Begues Obs. 2006 OC7
474Mt. John Obs. 2006 OB7, 2006 OC7
65811.8m Plaskett Telescope - Dave Balam2006 OB7
691Spacewatch 0.9m telescope 2006 CT
704LINEAR 2006 OB7, 2006 OC7
734Farpoint Obs. 2006 OB7, 2006 OC7, 2006 OK3
932McCarthy Obs. 2006 OB7, 2006 OC7
A32Panker Obs. 2004 XP14
E12Siding Spring Survey (SSS) 2006 OA1, 2006 OE10, 2006 OY4
G96Mt. Lemmon Survey (MLS) 2006 OB7, 2006 OC7, 2006 OK3
I77CEAMIG-REA 2006 OC7, 2006 OE10
J95Great Shefford Obs. 2006 OB7, 2006 OC7
[ object listings | index | 48 Hours | viewing | top ]

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