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Earth's Busy Neighborhood

    ACC's Small Object Report for 29 Jan.-4 Feb. 2007    

A semi-automated report compiled on 4 February 2007 at 2359 UTC

Eight small asteroids* were reported in the last 168 hours, during which none were newly discovered.
*This week's reporting also includes two asteroids just outside the small classification.
Currently 1,226 NEAs are listed with H>22.0 by JPL and/or the MPC (1,044 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 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 ]
2007 BZ48 (K07B48Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 22 meters per JPL H=25.96, MPC H=25.9 JPL classifies 2007 BZ48 as an Apollo and calculates an Earth MOID of 0.005281 AU (2.05 LD), and reports this object will pass Earth at 4.5 lunar distances (LD) on 7 Feb. 2007 at 0954 UT. Lowell Observatory reports 2007 BZ48 has an MOID of 0.02945 AU (11.46 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-C11 and 2007-C12: Great Shefford Obs. [J95] 2007-02-02 2222-2246, 4 pos. in MPEC 2007-C11, follow-up 2007-02-03 2254-2300, 3 pos. in MPEC 2007-C12, follow-up See also information from the week ending 28 Jan. 2007. 2007 BD (K07B00D) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 22 meters per JPL H=25.89, MPC H=25.3 JPL classifies 2007 BD as an Aten and calculates an Earth MOID of 0.002571 AU (1.00 LD), and reports this object passed Earth at 0.8 LD on 18 Jan. 2007 at 0252 UT. Lowell Observatory reports 2007 BD has an MOID of 0.02867 AU (11.16 LD) with Mercury. Observations are reported from the following observatories in MPEC 2007-B67: Gnosca Obs. [143] 2007-01-17 2115-0023, 27 pos. in MPEC 2007-B67, follow-up See also information from the week ending 21 Jan. 2007. 2007 BU7 (K07B07U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 45 meters per JPL H=24.36, MPC H=24.1 JPL classifies 2007 BU7 as an Aten and calculates an Earth MOID of 0.009805 AU (3.82 LD), and reports this object passed Earth at 4.2 LD on 19 Jan. 2007 at 1823 UT. Lowell Observatory reports 2007 BU7 has an MOID of 0.02224 AU (8.65 LD) with Venus. Observations are reported from the following observatories in MPEC 2007-B78: Great Shefford Obs. [J95] 2007-01-31 0000-0017, 2 pos. in MPEC 2007-B78, follow-up (B) See also information from the week ending 28 Jan. 2007. 2003 WP25 (K03W25P) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 47 meters per JPL H=24.30, MPC H=24.3 JPL classifies 2003 WP25 as an Aten and calculates an Earth MOID of 0.023420 AU (9.11 LD). Observations are reported from the following observatories in MPEC 2007-B73: Antares Obs. [H55] 2007-01-26 0207-0236, 3 pos. in MPEC 2007-B73, follow-up 2007 BS2 (K07B02S) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 72 meters per JPL H=23.35, MPC H=23.3 JPL classifies 2007 BS2 as an Amor and calculates an Earth MOID of 0.133782 AU (52.06 LD). Observations are reported from the following observatories in MPEC 2007-B67: Spacewatch 1.8m telescope [291] 2007-01-28 0803-0815, 3 pos. in MPEC 2007-B67, follow-up See also information from the week ending 28 Jan. 2007. 2007 BJ (K07B00J) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 95 meters per JPL H=22.77, MPC H=22.6 JPL classifies 2007 BJ as an Apollo and calculates an Earth MOID of 0.082727 AU (32.19 LD), and reports this object passed Earth at 32.7 LD on 16 Jan. 2007. Observations are reported from the following observatories in MPEC 2007-C11: Mauna Kea [568{2}] coded to David Tholen et al. 2007-01-25 0800-0836, 4 pos. in MPEC 2007-C11, follow-up See also information from the week ending 28 Jan. 2007. 2007 BC8 (K07B08C) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 120 meters per JPL H=22.25, MPC H=22.4 JPL classifies 2007 BC8 as an Amor and calculates an Earth MOID of 0.039466 AU (15.36 LD), and reports this object will pass Earth at 33.9 LD on 8 Feb. 2007. Lowell Observatory reports 2007 BC8 has an MOID of 0.03210 AU (12.49 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-B67, 2007-B73, 2007-B78, 2007-C11, and 2007-C12: Parma Obs. [A56] 2007-01-28 0112-0142, 3 pos. in MPEC 2007-B67, follow-up Schiaparelli Obs. [204] 2007-01-28 0309-0321, 3 pos. in MPEC 2007-C12, follow-up Catalina Sky Survey (CSS) [703] 2007-01-29 0944-1007, 4 pos. in MPEC 2007-B73, follow-up Sandlot Obs. [H36] 2007-01-30 1053-1108, 5 pos. in MPEC 2007-B78, follow-up Naef Obs. [A13] 2007-01-30 2240-2309, 2 pos. in MPEC 2007-B78, follow-up Great Shefford Obs. [J95] 2007-02-03 0316-0341, 3 pos. in MPEC 2007-C11, follow-up 2007-02-04 0240-0250, 3 pos. in MPEC 2007-C12, follow-up See also information from the week ending 28 Jan. 2007. 2007 AS2 (K07A02S) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 128 meters per JPL H=22.12, MPC H=22.2 This object was listed from 11 until 14 Jan. 2007 as an impact risk. JPL classifies 2007 AS2 as an Apollo and calculates an Earth MOID of 0.041677 AU (16.22 LD), and reports this object passed Earth at 31.7 LD on 5 Jan. 2007. Observations are reported from the following observatories in MPEC 2007-B67: Mt. Lemmon Survey (MLS) [G96] 2007-01-28 0414-0534, 7 pos. in MPEC 2007-B67, follow-up See also information from the week ending 28 Jan. 2007. 2006 AM4 (K06A04M) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 140 meters per JPL H=21.92, MPC H=21.8 -- not small This object was listed from 10 until 18 Jan. 2006 as an impact risk. JPL classifies 2006 AM4 as an Aten and calculates an Earth MOID of 0.011026 AU (4.29 LD), and reports this object passed Earth at 5.2 LD on 1 Feb. 2007 at 0705 UT. Lowell Observatory reports 2006 AM4 has significant MOIDs with planets Mercury (0.00948 AU = 3.69 LD) and Venus (0.01045 AU = 4.07 LD). Observations are reported from the following observatories in MPECs 2007-B67, 2007-B73, 2007-C01, and 2007-C11: Schiaparelli Obs. [204] 2007-01-28 0154-0203, 5 pos. in MPEC 2007-C01, follow-up 2007-02-01 0227-0229, 5 pos. in MPEC 2007-C01, follow-up Mt. Lemmon Survey (MLS) [G96] 2007-01-28 0946-1117, 8 pos. in MPEC 2007-B67, follow-up 2007-01-29 1312-1316, 4 pos. in MPEC 2007-B73, follow-up Petit Jean Mountain South Obs. [H45] 2007-01-28 1039-1046, 8 pos. in MPEC 2007-B67, follow-up New Millennium Obs. [A24] 2007-01-28 2134-2134, 1 pos. in MPEC 2007-B73, follow-up GiaGa Obs. [203] 2007-01-29 0012-0024, 2 pos. in MPEC 2007-B73, follow-up Hamamatsu-Yuto Obs. [379] 2007-01-29 1511-1527, 4 pos. in MPEC 2007-B73, follow-up Bisei Spaceguard Center [300] 2007-01-30 1909-1917, 10 pos. in MPEC 2007-C11, follow-up See also information from the week ending 28 Jan. 2007. 2006 UQ17 (K06U17Q) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 141 meters per JPL H=21.90, MPC H=21.9 -- not small This object was listed from 21 until 22 Oct. 2006 as an impact risk. JPL classifies 2006 UQ17 as an Apollo and calculates an Earth MOID of 0.022315 AU (8.68 LD), and reports this object passed Earth at 11.3 LD on 2 Jan. 2007. Lowell Observatory reports 2006 UQ17 has an MOID of 0.00882 AU (3.43 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-B67, 2007-B73, 2007-B78, 2007-C01, 2007-C10, 2007-C11, and 2007-C12: Verona Obs. [A48] 2007-01-03 2055-2059, 4 pos. in MPEC 2007-B78, follow-up Hadano Obs. [355] 2007-01-08 1616-1625, 5 pos. in MPEC 2007-C11, follow-up Greiner Research Obs. [H51] 2007-01-27 0400-0425, 3 pos. in MPEC 2007-B73, follow-up Petit Jean Mountain South Obs. [H45] 2007-01-28 1000-1009, 6 pos. in MPEC 2007-B67, follow-up 2007-01-31 0921-0928, 5 pos. in MPEC 2007-C01, follow-up 2007-02-03 0859-0905, 2 pos. in MPEC 2007-C12, follow-up New Millennium Obs. [A24] 2007-01-28 2036-2129, 3 pos. in MPEC 2007-B73, follow-up 2007-01-29 2253-2346, 4 pos. in MPEC 2007-B78, follow-up Catalina Sky Survey (CSS) [703] 2007-01-29 0907-0927, 4 pos. in MPEC 2007-B73, follow-up Naef Obs. [A13] 2007-01-29 2010-2225, 4 pos. in MPEC 2007-B73, follow-up Castelmartini Obs. [160] 2007-01-30 2144-2158, 6 pos. in MPEC 2007-C10, follow-up See also information from the week ending 28 Jan. 2007.
48+120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of eight small objects were reported during the last 168 hours: 2003 WP25, 2007 AS2, 2007 BC8, 2007 BD, 2007 BJ, 2007 BS2, 2007 BU7 & 2007 BZ48, as well as almost-small 2006 AM4 & 2006 UQ17 in MPECs: 2007-B67 time-stamped 2007 Jan. 29, 07:08 UT - Daily Orbit Update 2007-B73 time-stamped 2007 Jan. 30, 07:08 UT - Daily Orbit Update 2007-B78 time-stamped 2007 Jan. 31, 07:08 UT - Daily Orbit Update 2007-C01 time-stamped 2007 Feb. 1, 07:10 UT - Daily Orbit Update 2007-C10 time-stamped 2007 Feb. 2, 07:10 UT - Daily Orbit Update 2007-C11 time-stamped 2007 Feb. 3, 07:09 UT - Daily Orbit Update 2007-C12 time-stamped 2007 Feb. 4, 07:06 UT - Daily Orbit Update Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2007 Feb. 4, 1534 UTC JPL NEO Orbital Elements, downloaded at 2007 Feb. 4, 1608 UTC Lowell Observatory Orbit intersections, time-stamped 2007 Jan 31 1854:59 UTC MPC NEA.DAT from MPC mirror, downloaded at 2007 Feb. 4, 2052 UTC Risk monitoring sites, as of A/CC's check at 2007 Feb. 4, 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 20 small objects as being currently in view, including 13 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) ---------- ---------- -------- --- ----- --- - ----------------------- 2007 BU7 2007-02-08 0.009805 45 24.36 7 - (31 Jan.) 2003 WP25 2007-02-09 0.023420 47 24.30 4op - "only 1 night" (30 Jan.) 2007 BZ48 2007-02-12 0.005281 22 25.96 7 - (3 Feb.) 2006 XP4 2007-02-14 0.004110 55 23.93 41 - was risk listed, past obs. (24 Jan.) 2007 AA9 2007-02-16 0.015157 131 22.06 9 - past obs. (23 Jan.) 2006 XY2 2007-02-18 0.182560 104 22.56 28 - past obs. (11 Jan.) 2007 BD8 2007-02-19 0.031041 42 24.52 3 - past obs. (3 Feb.) 2006 YJ2 2007-02-21 0.092313 127 22.13 31 - past obs. (24 Jan.) 2002 VX91 2007-02-23 0.001376 51 24.12 2op - (3 Dec.) 2007 BY48 2007-02-23 0.029385 107 22.51 2 - past obs. (28 Jan.) 2007 AS2 2007-02-24 0.041677 128 22.12 19 - was risk listed (29 Jan.) 2006 XY 2007-02-25 0.006952 54 24.00 19 - past obs. (16 Jan.) 2007 BA49 2007-02-25 0.058156 38 24.76 1 - past obs. (28 Jan.) 2006 YH14 2007-03-12 0.091097 75 23.26 31 - past obs. (14 Jan.) 2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.) 2007 BS2 2007-03-20 0.133782 72 23.35 11 - (29 Jan.) 2000 PN8 2007-03-26 0.079762 127 22.13 26 - bright recov. poss. (3 Dec.) 2006 UQ17 2007-04-03 0.022315 141 21.90 128 - was risk listed (4 Feb.) 2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.) 2007 BC8 2007-05-27 0.039466 120 22.25 11 - (3 Feb.) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2007 BA49 2007-02-25 0.058156 38 24.76 1 - past obs. (28 Jan.) 2007 BZ48 2007-02-12 0.005281 22 25.96 7 - (3 Feb.) 2007 BY48 2007-02-23 0.029385 107 22.51 2 - past obs. (28 Jan.) 2007 BD8 2007-02-19 0.031041 42 24.52 3 - past obs. (3 Feb.) 2007 BC8 2007-05-27 0.039466 120 22.25 11 - (3 Feb.) 2007 BU7 2007-02-08 0.009805 45 24.36 7 - (31 Jan.) 2007 BS2 2007-03-20 0.133782 72 23.35 11 - (29 Jan.) 2007 AA9 2007-02-16 0.015157 131 22.06 9 - past obs. (23 Jan.) 2007 AS2 2007-02-24 0.041677 128 22.12 19 - was risk listed (29 Jan.) 2006 YH14 2007-03-12 0.091097 75 23.26 31 - past obs. (14 Jan.) 2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.) 2006 YJ2 2007-02-21 0.092313 127 22.13 31 - past obs. (24 Jan.) 2006 XP4 2007-02-14 0.004110 55 23.93 41 - was risk listed, past obs. (24 Jan.) 2006 XY2 2007-02-18 0.182560 104 22.56 28 - past obs. (11 Jan.) 2006 XY 2007-02-25 0.006952 54 24.00 19 - past obs. (16 Jan.) 2006 UQ17 2007-04-03 0.022315 141 21.90 128 - was risk listed (4 Feb.) 2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.) 2003 WP25 2007-02-09 0.023420 47 24.30 4op - "only 1 night" (30 Jan.) 2002 VX91 2007-02-23 0.001376 51 24.12 2op - (3 Dec.) 2000 PN8 2007-03-26 0.079762 127 22.13 26 - bright recov. poss. (3 Dec.) 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
2003 WP25H55
2006 AM4203, 204, 300, 379, A24, G96, H45
2006 UQ17160, 355, 703, A13, A24, A48, H45, H51
2007 AS2G96
2007 BC8204, 703, A13, A56, H36, J95
2007 BD143
2007 BJ568
2007 BS2291
2007 BU7J95
2007 BZ48J95
CodeObservatoryObjects Observed
143Gnosca Obs. 2007 BD
160Castelmartini Obs. 2006 UQ17
203GiaGa Obs. 2006 AM4
204Schiaparelli Obs. 2006 AM4, 2007 BC8
291Spacewatch 1.8m telescope 2007 BS2
300Bisei Spaceguard Center 2006 AM4
355Hadano Obs. 2006 UQ17
379Hamamatsu-Yuto Obs. 2006 AM4
5682Mauna Kea - David Tholen et al.2007 BJ
703Catalina Sky Survey (CSS) 2006 UQ17, 2007 BC8
A13Naef Obs. 2006 UQ17, 2007 BC8
A24New Millennium Obs. 2006 AM4, 2006 UQ17
A48Verona Obs. 2006 UQ17
A56Parma Obs. 2007 BC8
G96Mt. Lemmon Survey (MLS) 2006 AM4, 2007 AS2
H36Sandlot Obs. 2007 BC8
H45Petit Jean Mountain South Obs. 2006 AM4, 2006 UQ17
H51Greiner Research Obs. 2006 UQ17
H55Antares Obs. 2003 WP25
J95Great Shefford Obs. 2007 BC8, 2007 BU7, 2007 BZ48
[ object listings | index | 48 Hours | viewing | top ]

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