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Earth's Busy Neighborhood

    ACC's Small Object Report for 13-19 February 2006    

A semi-automated report compiled on 19 February 2006 at 2359 UTC

There are 3* small objects reported in the last 168 hours, during which none were newly discovered.
*One other object with absolute magnitude just above H=22.0 is also included in this week's report.
Currently 990 NEAs are listed with H>22.0 by JPL and/or the Minor Planet Center (812 are listed as such by both).

[ 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 future exploration and exploitation. They are mostly a sampling of distant asteroid populations, but some may be remnants of the event that created the Earth-Moon system.
      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 BZ147 (K06BE7Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 28 meters per JPL H=25.42, MPC H=25.4 This object has been listed as an impact risk since 3 Feb. 2006. JPL classifies 2006 BZ147 as an Apollo and calculates an Earth MOID of 0.002250 AU (0.88 LD), and reports this object will pass Earth at 16.0 lunar distances (LD) on 4 March 2006 Observations are reported from the following observatories in MPEC 2006-D09: Great Shefford Obs. [J95] 2006-02-17 2115-2152, 3 pos in MPEC 2006-D09, follow-up See also information from the week ending 12 Feb. 2006. 2006 CL9 (K06C09L) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 101 meters per JPL H=22.62, MPC H=22.4 JPL classifies 2006 CL9 as an Amor and calculates an Earth MOID of 0.039803 AU (15.49 LD), and reports this object will pass Earth at 18.6 LD on 25 Feb. 2006 Observations are reported from the following observatories in MPECs 2006-C73, 2006-C75, and 2006-D09: Desert Moon Obs. [448] 2006-02-13 0405-0416, 3 pos in MPEC 2006-C73, follow-up McCarthy Obs. [932] 2006-02-14 0350-0430, 3 pos in MPEC 2006-C73, follow-up Lindenberg Obs. [A80] 2006-02-14 1725-1737, 3 pos in MPEC 2006-C75, follow-up Great Shefford Obs. [J95] 2006-02-14 1922-1927, 3 pos in MPEC 2006-C75, follow-up Naef Obs. [A13] 2006-02-18 2248-2343, 4 pos in MPEC 2006-D09, follow-up Sandlot Obs. [H36] 2006-02-19 0303-0316, 5 pos in MPEC 2006-D09, follow-up See also information from the week ending 12 Feb. 2006. 2006 CW (K06C00W) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 106 meters per JPL H=22.53, MPC H=22.5 JPL classifies 2006 CW as an Amor and calculates an Earth MOID of 0.152351 AU (59.28 LD). Observations are reported from the following observatories in MPEC 2006-D01: Great Shefford Obs. [J95] 2006-02-16 0033-0049, 3 pos in MPEC 2006-D01, follow-up See also information from the week ending 12 Feb. 2006. 2006 BE55 (K06B55E) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 140 meters per JPL H=21.92, MPC H=21.9 -- borderline size ("not small") JPL classifies 2006 BE55 as an Apollo and calculates an Earth MOID of 0.023624 AU (9.19 LD), and reports this object will pass Earth at 16.1 LD on 27 Feb. 2006 Lowell Observatory reports 2006 BE55 has significant MOIDs with planets Venus (0.00395 AU = 1.54 LD) and Mars (0.04380 AU = 17.04 LD). Observations are reported from the following observatories in MPECs 2006-C71 and 2006-D09: Desert Moon Obs. [448] 2006-02-12 0908-0929, 3 pos in MPEC 2006-C71, follow-up Naef Obs. [A13] 2006-02-19 0011-0103, 6 pos in MPEC 2006-D09, follow-up See also information from the week ending 12 Feb. 2006.
48 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of three small objects were reported during the last 48 hours: 2006 BE55, 2006 BZ147 & 2006 CL9 in MPEC 2006-D09 (Daily Orbit Update) time-stamped 2006 Feb. 19, 07:29 UT. Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2006 Feb. 19, 1702 UTC JPL NEO Orbital Elements, downloaded at 2006 Feb. 19, 1706 UTC Lowell Observatory Orbit intersections, time-stamped 2006 Feb 19 11:52:24 UTC MPC NEA.DAT from MPC mirror, downloaded at 2006 Feb. 19, 1659 UTC Risk monitoring sites, as of A/CC's check at 2006 Feb. 19, 2359 UTC (see CRT page)
Viewing Opportunities for Small Objects [ news | size order | alpha order | top ]
This compilation shows 23 small objects as being currently in view, including 19 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) ---------- ---------- -------- --- ----- --- - ----------------------- 2005 RA3 2006-02-20 0.048586 132 22.04 141 - past obs. - (22 Jan.) 2006 CL 2006-02-20 0.019833 28 25.45 5 - past obs. - (8 Feb.) 2006 BP7 2006-02-21 0.062600 77 23.21 9 - past obs. - (1 Feb.) 2006 BA9 2006-02-21 0.072861 92 22.84 11 - past obs. - (5 Feb.) 2006 CW9 2006-02-21 0.018471 49 24.21 1 - past obs. - (7 Feb.) 2002 LW 2006-02-22 0.034393 110 22.45 2op - past obs. - (28 Dec.) 2006 AW44 2006-02-22 0.120608 71 23.38 19 - past obs. - (4 Feb.) 2006 BF 2006-02-23 0.012392 69 23.46 11 - past obs. - (4 Feb.) 2005 CN 2006-02-23 0.029201 85 23.01 2op - past obs. - (4 Feb.) 2006 BN26 2006-02-28 0.026180 68 23.49 13 - past obs. - (8 Feb.) 2005 ML13 2006-03-02 0.062125 112 22.41 2op - past obs. - (30 Jan.) 2006 BJ55 2006-03-02 0.027612 49 24.21 14 - past obs. - (10 Feb.) 2006 BO6 2006-03-04 0.030260 113 22.39 10 - past obs. - (4 Feb.) 2006 BE55 2006-03-05 0.023624 140 21.92 17 - (19 Feb.) 2006 BZ147 2006-03-07 0.002250 28 25.42 18 - risk listed - (19 Feb.) 2005 RZ2 2006-03-08 0.077868 77 23.22 5 - (28 Dec.) 2006 AX44 2006-03-09 0.117155 35 24.93 21 - past obs. - (4 Feb.) 1999 AO10 2006-03-18 0.021364 57 23.86 33 - faint recov. poss. - (15 Dec.) 2006 CT 2006-03-20 0.002115 123 22.20 5 - past obs. - (8 Feb.) 2005 XO4 2006-04-20 0.021856 126 22.14 23 - past obs. - (7 Jan.) 2006 CL9 2006-05-28 0.039803 101 22.62 15 - (19 Feb.) 2006 CW 2006-05-30 0.152351 106 22.53 13 - (16 Feb.) 2005 YA37 2006-07-09 0.035667 111 22.43 26 - past obs. - (4 Feb.) Coming into view soon: 2005 CN61 2006-02-28 0.021639 29 25.30 6 - >21 Feb., very faint recov. poss. - (15 Dec.) 1999 NW2 2006-03-10 0.016428 80 23.13 28 - >24 Feb., very faint recov. poss. - (15 Dec.) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2006 CW9 2006-02-21 0.018471 49 24.21 1 - past obs. - (7 Feb.) 2006 CL9 2006-05-28 0.039803 101 22.62 15 - (19 Feb.) 2006 CW 2006-05-30 0.152351 106 22.53 13 - (16 Feb.) 2006 CT 2006-03-20 0.002115 123 22.20 5 - past obs. - (8 Feb.) 2006 CL 2006-02-20 0.019833 28 25.45 5 - past obs. - (8 Feb.) 2006 BZ147 2006-03-07 0.002250 28 25.42 18 - risk listed - (19 Feb.) 2006 BJ55 2006-03-02 0.027612 49 24.21 14 - past obs. - (10 Feb.) 2006 BE55 2006-03-05 0.023624 140 21.92 17 - (19 Feb.) 2006 BN26 2006-02-28 0.026180 68 23.49 13 - past obs. - (8 Feb.) 2006 BA9 2006-02-21 0.072861 92 22.84 11 - past obs. - (5 Feb.) 2006 BP7 2006-02-21 0.062600 77 23.21 9 - past obs. - (1 Feb.) 2006 BO6 2006-03-04 0.030260 113 22.39 10 - past obs. - (4 Feb.) 2006 BF 2006-02-23 0.012392 69 23.46 11 - past obs. - (4 Feb.) 2006 AX44 2006-03-09 0.117155 35 24.93 21 - past obs. - (4 Feb.) 2006 AW44 2006-02-22 0.120608 71 23.38 19 - past obs. - (4 Feb.) 2005 YA37 2006-07-09 0.035667 111 22.43 26 - past obs. - (4 Feb.) 2005 XO4 2006-04-20 0.021856 126 22.14 23 - past obs. - (7 Jan.) 2005 RA3 2006-02-20 0.048586 132 22.04 141 - past obs. - (22 Jan.) 2005 RZ2 2006-03-08 0.077868 77 23.22 5 - (28 Dec.) 2005 ML13 2006-03-02 0.062125 112 22.41 2op - past obs. - (30 Jan.) 2005 CN61 2006-02-28 0.021639 29 25.30 6 - >21 Feb., very faint recov. poss. - (15 Dec.) 2005 CN 2006-02-23 0.029201 85 23.01 2op - past obs. - (4 Feb.) 2002 LW 2006-02-22 0.034393 110 22.45 2op - past obs. - (28 Dec.) 1999 NW2 2006-03-10 0.016428 80 23.13 28 - >24 Feb., very faint recov. poss. - (15 Dec.) 1999 AO10 2006-03-18 0.021364 57 23.86 33 - faint recov. poss. - (15 Dec.) Out-of-view date based on MPES solar elongation <40° and/or magnitude V>22.0 at 1200 UT. (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.
Small object observation cross index [ size order | 48 Hours | viewing | top ]
ObjectObserved by MPC code
2006 BE55448, A13
2006 BZ147J95
2006 CL9448, 932, A13, A80, H36, J95
2006 CWJ95
CodeObservatoryObjects Observed
448Desert Moon Obs. 2006 BE55, 2006 CL9
932McCarthy Obs. 2006 CL9
A13Naef Obs. 2006 BE55, 2006 CL9
A80Lindenberg Obs. 2006 CL9
H36Sandlot Obs. 2006 CL9
J95Great Shefford Obs. 2006 BZ147, 2006 CL9, 2006 CW
[ object listings | index | 48 Hours | viewing | top ]

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