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Earth's Busy Neighborhood

    ACC's Small Object Report for 15-21 January 2007    

A semi-automated report compiled on 21 January 2007 at 2359 UTC

Nine small asteroids were reported in the last 168 hours, during which three were newly discovered.*
*One was newly classified as small, and two almost-small objects are also included in this week's report.
Currently 1,219 NEAs are listed with H>22.0 by JPL and/or the MPC (1,036 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 BB (K07B00B) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 9 meters per JPL H=27.83, MPC H=27.8 This object has been listed as an impact risk since 17 Jan. 2007. JPL classifies 2007 BB as an Aten and calculates an Earth MOID of 0.001504 AU (0.59 LD), and reports this object passed Earth at 1.0 lunar distances (LD) on 19 Jan. 2007 at 1526 UT. Observations are reported from the following observatories in MPECs 2007-B13 and 2007-B23: Catalina Sky Survey (CSS) [703] 2007-01-17 0638-0751, 8 pos. in MPEC 2007-B13, discovery (*) 2007-01-17 1038-1042, 4 pos. in MPEC 2007-B13, confirmation 2007-01-17 1323-1324, 3 pos. in MPEC 2007-B13, confirmation Farpoint Obs. [734] 2007-01-19 0558-0608, 6 pos. in MPEC 2007-B23, follow-up 2007 BD (K07B00D) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 24 meters per JPL H=25.72, 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 0.02977 AU (11.58 LD) with Mercury. Observations are reported from the following observatories in MPECs 2007-B15, 2007-B16, 2007-B17, and 2007-B26: Catalina Sky Survey (CSS) [703] 2007-01-16 1030-1153, 8 pos. in MPEC 2007-B15, discovery (*) 2007-01-16 1322-1324, 4 pos. in MPEC 2007-B15, confirmation 2007-01-17 0917-0918, 4 pos. in MPEC 2007-B15, confirmation 2007-01-18 0346-0346, 3 pos. in MPEC 2007-B17, follow-up Andrushivka Obs. [A50] 2007-01-17 0216-0220, 4 pos. in MPEC 2007-B15, confirmation Sabino Canyon Obs. [854] 2007-01-17 0638-0645, 6 pos. in MPEC 2007-B15, confirmation Farpoint Obs. [734] 2007-01-17 1029-1045, 4 pos. in MPEC 2007-B15, confirmation Crimean Astrophysical Obs. [095] 2007-01-17 1933-2221, 82 pos. in MPEC 2007-B17, follow-up Gnosca Obs. [143] 2007-01-17 2115-0023, 31 pos. in MPEC 2007-B16, follow-up Modra Obs. [118] 2007-01-18 0205-0209, 7 pos. in MPEC 2007-B16, follow-up Great Shefford Obs. [J95] 2007-01-20 1930-1952, 3 pos. in MPEC 2007-B26, follow-up 2007 AA2 (K07A02A) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 40 meters per JPL H=24.63, MPC H=24.6 This object was listed from 10 until 12 Jan. 2007 as an impact risk. JPL classifies 2007 AA2 as an Apollo and calculates an Earth MOID of 0.011335 AU (4.41 LD), and reports this object passed Earth at 10.6 LD on 6 Jan. 2007. Observations are reported from the following observatories in MPEC 2007-B05: KLENOT [246] 2007-01-15 2044-2050, 6 pos. in MPEC 2007-B05, follow-up See also information from the week ending 14 Jan. 2007. 2007 AU2 (K07A02U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 50 meters per JPL H=24.17, MPC H=24.1 JPL classifies 2007 AU2 as an Apollo and calculates an Earth MOID of 0.012180 AU (4.74 LD), and reports this object passed Earth at 10.4 LD on 14 Jan. 2007. Observations are reported from the following observatories in MPEC 2007-A54: Great Shefford Obs. [J95] 2007-01-14 0016-0024, 3 pos. in MPEC 2007-A54, follow-up 2007-01-15 0129-0132, 2 pos. in MPEC 2007-A54, follow-up See also information from the week ending 14 Jan. 2007. 2006 XY (K06X00Y) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 54 meters per JPL H=24.00, MPC H=24.0 JPL classifies 2006 XY as an Apollo and calculates an Earth MOID of 0.006952 AU (2.71 LD), and reports this object passed Earth at 4.8 LD on 18 Dec. 2006 at 0414 UT. Observations are reported from the following observatories in MPEC 2007-B05: Desert Moon Obs. [448] 2007-01-15 0905-1020, 3 pos. in MPEC 2007-B05, follow-up See also information from the week ending 7 Jan. 2007. 2006 XP4 (K06X04P) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 55 meters per JPL H=23.93, MPC H=23.9 This object has been listed as an impact risk since 16 Dec. 2006. JPL classifies 2006 XP4 as an Aten and calculates an Earth MOID of 0.004110 AU (1.60 LD), and reports this object passed Earth at 28.6 LD on 9 Jan. 2007. Lowell Observatory reports 2006 XP4 has an MOID of 0.02027 AU (7.89 LD) with Venus. Observations are reported from the following observatories in MPECs 2007-B05 and 2007-B23: KLENOT [246] 2007-01-15 2023-2032, 4 pos. in MPEC 2007-B05, follow-up Consell Obs. [176] 2007-01-19 2139-2144, 5 pos. in MPEC 2007-B23, follow-up See also information from the week ending 14 Jan. 2007. 2007 BJ (K07B00J) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 91 meters per JPL H=22.86, MPC H=22.8 JPL classifies 2007 BJ as an Apollo and calculates an Earth MOID of 0.083503 AU (32.49 LD), and reports this object passed Earth at 33.0 LD on 16 Jan. 2007. Observations are reported from the following observatories in MPEC 2007-B24: LONEOS [699] 2007-01-19 0748-0851, 3 pos. in MPEC 2007-B24, discovery (*) 2007-01-19 1206-1220, 3 pos. in MPEC 2007-B24, confirmation Schiaparelli Obs. [204] 2007-01-19 2246-2251, 5 pos. in MPEC 2007-B24, confirmation Consell Obs. [176] 2007-01-19 2349-2351, 6 pos. in MPEC 2007-B24, confirmation Remanzacco Obs. [473] 2007-01-20 0008-0032, 4 pos. in MPEC 2007-B24, confirmation Table Mountain Obs. [673{5}] coded to Jim Young 2007-01-20 0709-0739, 6 pos. in MPEC 2007-B24, confirmation 2007 AS2 (K07A02S) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 132 meters per JPL H=22.05, MPC H=22.1 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 0.041770 AU (16.25 LD), and reports this object passed Earth at 31.9 LD on 5 Jan. 2007. Observations are reported from the following observatories in MPECs 2007-A54, 2007-B05, 2007-B12, 2007-B17, and 2007-B23: Frasso Sabino Obs. [157] 2007-01-13 2043-2045, 2 pos. in MPEC 2007-A54, follow-up Lumezzane Obs. [130] 2007-01-13 2105-2110, 3 pos. in MPEC 2007-B05, follow-up Hormersdorf Obs. [A35] 2007-01-15 1924-1932, 3 pos. in MPEC 2007-B17, follow-up Mt. Lemmon Survey (MLS) [G96] 2007-01-16 0618-0620, 4 pos. in MPEC 2007-B12, follow-up 2007-01-17 0618-0620, 4 pos. in MPEC 2007-B17, follow-up Farpoint Obs. [734] 2007-01-17 0556-0612, 4 pos. in MPEC 2007-B12, follow-up Begues Obs. [170] 2007-01-19 2258-2301, 3 pos. in MPEC 2007-B23, follow-up See also information from the week ending 14 Jan. 2007. 2007 AA9 (K07A09A) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 136 meters per JPL H=21.98, MPC H=22.1 JPL classifies 2007 AA9 as an Aten and calculates an Earth MOID of 0.015223 AU (5.92 LD), and reports this object passed Earth at 17.6 LD on 30 Dec. 2006. Observations are reported from the following observatories in MPECs 2007-A50, 2007-A54, 2007-B05, and 2007-B12: LINEAR [704] 2007-01-13 0513-0610, 4 pos. in MPEC 2007-A50, discovery (*) 2007-01-14 0321-0440, 9 pos. in MPEC 2007-A54, follow-up Great Shefford Obs. [J95] 2007-01-14 0055-0116, 4 pos. in MPEC 2007-A50, confirmation (I) 2007-01-14 1955-2013, 3 pos. in MPEC 2007-A54, follow-up KLENOT [246] 2007-01-15 2134-2143, 6 pos. in MPEC 2007-B05, follow-up Catalina Sky Survey (CSS) [703] 2007-01-16 0651-0715, 2 pos. in MPEC 2007-B12, follow-up 2006 UQ17 (K06U17Q) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 140 meters per JPL H=21.92, 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-A54, 2007-B05, 2007-B12, 2007-B16, 2007-B17, 2007-B23, and 2007-B26: Hamamatsu-Yuto Obs. [379] 2007-01-12 1335-1407, 5 pos. in MPEC 2007-A54, follow-up 2007-01-15 1406-1443, 7 pos. in MPEC 2007-B05, follow-up 2007-01-18 1426-1507, 12 pos. in MPEC 2007-B17, follow-up University Hills Obs. [G72] 2007-01-14 1038-1125, 6 pos. in MPEC 2007-A54, follow-up 2007-01-15 1031-1059, 6 pos. in MPEC 2007-B05, follow-up 2007-01-16 0930-0948, 6 pos. in MPEC 2007-B12, follow-up 2007-01-17 0820-0838, 6 pos. in MPEC 2007-B16, follow-up Drebach Obs. [113] 2007-01-14 2007-2021, 6 pos. in MPEC 2007-A54, follow-up New Millennium Obs. [A24] 2007-01-19 2219-2313, 4 pos. in MPEC 2007-B23, follow-up 2007-01-20 0033-0035, 2 pos. in MPEC 2007-B23, follow-up Greiner Research Obs. [H51] 2007-01-20 1005-1018, 10 pos. in MPEC 2007-B26, follow-up See also information from the week ending 14 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=21.9 -- 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 will pass 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-B05, 2007-B12, 2007-B16, and 2007-B26: KLENOT [246] 2007-01-15 2244-2252, 6 pos. in MPEC 2007-B05, follow-up Mt. Lemmon Survey (MLS) [G96] 2007-01-16 1005-1014, 4 pos. in MPEC 2007-B12, follow-up Spacewatch 0.9m telescope [691] 2007-01-17 1121-1211, 3 pos. in MPEC 2007-B16, follow-up Badlands Obs. [918] 2007-01-20 0611-0611, 1 pos. in MPEC 2007-B26, follow-up (F) 2007-01-20 0927-0927, 1 pos. in MPEC 2007-B26, follow-up (F) 2007-01-20 1050-1243, 3 pos. in MPEC 2007-B26, follow-up (F) See also information from the week ending 14 Jan. 2007.
48 + 120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of 9 small objects were reported during the last 168 hours: 2006 XP4, 2006 XY, 2007 AA2, 2007 AA9, 2007 AS2, 2007 AU2, 2007 BB, 2007 BD & 2007 BJ, as well as not-quite-small 2006 AM4 & 2006 UQ17 in MPECs: 2007-A54 time-stamped 2007 Jan. 15, 07:06 UT - Daily Orbit Update 2007-B05 time-stamped 2007 Jan. 16, 07:07 UT - Daily Orbit Update 2007-B12 time-stamped 2007 Jan. 17, 07:06 UT - Daily Orbit Update 2007-B13 time-stamped 2007 Jan. 17, 16:59 UT - 2007 BB 2007-B15 time-stamped 2007 Jan. 17, 18:49 UT - 2007 BD 2007-B16 time-stamped 2007 Jan. 18, 07:06 UT - Daily Orbit Update 2007-B17 time-stamped 2007 Jan. 19, 07:07 UT - Daily Orbit Update 2007-B23 time-stamped 2007 Jan. 20, 07:07 UT - Daily Orbit Update 2007-B24 time-stamped 2007 Jan. 20, 12:50 UT - 2007 BJ 2007-B26 time-stamped 2007 Jan. 21, 07:07 UT - Daily Orbit Update Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2007 Jan. 21, 1627 UTC JPL NEO Orbital Elements, downloaded at 2007 Jan. 21, 1705 UTC Lowell Observatory Orbit intersections, time-stamped 2007 Jan 18 1930:58 UTC MPC NEA.DAT from MPC mirror, downloaded at 2007 Jan. 21, 2137 UTC Risk monitoring sites, as of A/CC's check at 2007 Jan. 21, 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 10 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 BB 2007-01-22 0.001504 9 27.83 2 - risk listed (20 Jan.) 2005 CN 2007-01-27 0.029212 85 23.01 3op - past obs. (8 Jan.) 2006 XO4 2007-01-27 0.027667 72 23.36 25 - past obs. (12 Jan.) 2006 YA 2007-01-29 0.048686 82 23.07 19 - past obs. (6 Jan.) 2007 BD 2007-01-29 0.002571 24 25.72 4 - (21 Jan.) 2006 YP44 2007-02-02 0.001433 62 23.67 9 - was risk listed, past obs. (7 Jan.) 2007 BJ 2007-02-03 0.083503 91 22.86 1 - (20 Jan.) 2006 AM4 2007-02-03 0.011026 140 21.92 2op - was risk listed, radar target (21 Jan.) 2007 AA2 2007-02-04 0.011335 40 24.63 7 - was risk listed (16 Jan.) 2003 WP25 2007-02-07 0.023419 45 24.38 3op - (9 Dec.) 2006 XP4 2007-02-14 0.004110 55 23.93 36 - risk listed (20 Jan.) 2007 AA9 2007-02-17 0.015223 136 21.98 3 - (17 Jan.) 2006 XY2 2007-02-18 0.182560 104 22.56 28 - past obs. (11 Jan.) 2006 YJ2 2007-02-19 0.092302 125 22.17 18 - past obs. (9 Jan.) 2006 XY 2007-02-25 0.006952 54 24.00 19 - (16 Jan.) 2007 AS2 2007-02-25 0.041770 132 22.05 11 - was risk listed (20 Jan.) 2006 YH14 2007-03-12 0.091097 75 23.26 18 - past obs. (14 Jan.) 2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.) 2006 UQ17 2007-04-03 0.022315 140 21.92 114 - was risk listed (21 Jan.) 2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.) Coming into view soon: 2002 VX91 2007-02-23 0.001376 51 24.12 2op - >26 Jan. (3 Dec.) 2000 PN8 2007-03-26 0.079762 127 22.13 26 - >26 Jan., faint recov. poss. (3 Dec.) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2007 BJ 2007-02-03 0.083503 91 22.86 1 - (20 Jan.) 2007 BD 2007-01-29 0.002571 24 25.72 4 - (21 Jan.) 2007 BB 2007-01-22 0.001504 9 27.83 2 - risk listed (20 Jan.) 2007 AA9 2007-02-17 0.015223 136 21.98 3 - (17 Jan.) 2007 AS2 2007-02-25 0.041770 132 22.05 11 - was risk listed (20 Jan.) 2007 AA2 2007-02-04 0.011335 40 24.63 7 - was risk listed (16 Jan.) 2006 YP44 2007-02-02 0.001433 62 23.67 9 - was risk listed, past obs. (7 Jan.) 2006 YH14 2007-03-12 0.091097 75 23.26 18 - past obs. (14 Jan.) 2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.) 2006 YJ2 2007-02-19 0.092302 125 22.17 18 - past obs. (9 Jan.) 2006 YA 2007-01-29 0.048686 82 23.07 19 - past obs. (6 Jan.) 2006 XP4 2007-02-14 0.004110 55 23.93 36 - risk listed (20 Jan.) 2006 XO4 2007-01-27 0.027667 72 23.36 25 - past obs. (12 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 - (16 Jan.) 2006 UQ17 2007-04-03 0.022315 140 21.92 114 - was risk listed (21 Jan.) 2006 AM4 2007-02-03 0.011026 140 21.92 2op - was risk listed, radar target (21 Jan.) 2005 CN 2007-01-27 0.029212 85 23.01 3op - past obs. (8 Jan.) 2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.) 2003 WP25 2007-02-07 0.023419 45 24.38 3op - (9 Dec.) 2002 VX91 2007-02-23 0.001376 51 24.12 2op - >26 Jan. (3 Dec.) 2000 PN8 2007-03-26 0.079762 127 22.13 26 - >26 Jan., faint 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
2006 AM4246, 691, 918, G96
2006 UQ17113, 379, A24, G72, H51
2006 XP4176, 246
2006 XY448
2007 AA2246
2007 AA9246, 703, 704, J95
2007 AS2130, 157, 170, 734, A35, G96
2007 AU2J95
2007 BB703, 734
2007 BD095, 118, 143, 703, 734, 854, A50, J95
2007 BJ176, 204, 473, 673, 699
CodeObservatoryObjects Observed
095Crimean Astrophysical Obs. 2007 BD
113Drebach Obs. 2006 UQ17
118Modra Obs. 2007 BD
130Lumezzane Obs. 2007 AS2
143Gnosca Obs. 2007 BD
157Frasso Sabino Obs. 2007 AS2
170Begues Obs. 2007 AS2
176Consell Obs. 2006 XP4, 2007 BJ
204Schiaparelli Obs. 2007 BJ
246KLENOT 2006 AM4, 2006 XP4, 2007 AA2, 2007 AA9
379Hamamatsu-Yuto Obs. 2006 UQ17
448Desert Moon Obs. 2006 XY
473Remanzacco Obs. 2007 BJ
6735Table Mountain Obs. - Jim Young2007 BJ
691Spacewatch 0.9m telescope 2006 AM4
699LONEOS 2007 BJ
703Catalina Sky Survey (CSS) 2007 AA9, 2007 BB, 2007 BD
704LINEAR 2007 AA9
734Farpoint Obs. 2007 AS2, 2007 BB, 2007 BD
854Sabino Canyon Obs. 2007 BD
918Badlands Obs. 2006 AM4
A24New Millennium Obs. 2006 UQ17
A35Hormersdorf Obs. 2007 AS2
A50Andrushivka Obs. 2007 BD
G72University Hills Obs. 2006 UQ17
G96Mt. Lemmon Survey (MLS) 2006 AM4, 2007 AS2
H51Greiner Research Obs. 2006 UQ17
J95Great Shefford Obs. 2007 AA9, 2007 AU2, 2007 BD
[ object listings | index | 48 Hours | viewing | top ]

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