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Earth's Busy Neighborhood

    ACC's Small Object Report for 4-10 December 2006    

A semi-automated report compiled on 10 December 2006 at 2359 UTC

Ten small asteroids were reported in the last 168 hours, during which none were newly discovered.
Currently 1,187 NEAs are listed with H>22.0 by JPL and/or the MPC (1,003 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 ]
2006 WZ184 (K06WI4Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 21 meters per JPL H=25.99, MPC H=26.1 This object has been listed as an impact risk since 1 Dec. 2006. JPL classifies 2006 WZ184 as an Apollo and calculates an Earth MOID of 0.001895 AU (0.74 LD), and reports this object passed Earth at 5.9 lunar distances (LD) on 26 Nov. 2006 at 2156 UT. Lowell Observatory reports 2006 WZ184 has an MOID of 0.02125 AU (8.27 LD) with Mars. Observations are reported from the following observatories in MPECs 2006-X22, 2006-X27, and 2006-X29: Farpoint Obs. [734] 2006-12-08 0349-0422, 4 pos. in MPEC 2006-X22, follow-up Great Shefford Obs. [J95] 2006-12-08 2355-0026, 2 pos. in MPEC 2006-X27, follow-up Spacewatch 1.8m telescope [291] 2006-12-09 0430-0444, 3 pos. in MPEC 2006-X29, follow-up (H) See also information from the week ending 3 Dec. 2006. 2002 XT4 (K02X04T) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 55 meters per JPL H=23.94, MPC H=24.0 JPL classifies 2002 XT4 as an Apollo and calculates an Earth MOID of 0.018770 AU (7.30 LD). Observations are reported from the following observatories in MPEC 2006-X20: NEAT's telescope on Haleakala [608] 2002-11-30 1208-1238, 3 pos. in MPEC 2006-X20, precovery 2006 WR29 (K06W29R) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 56 meters per JPL H=23.89, MPC H=24.0 JPL classifies 2006 WR29 as an Amor and calculates an Earth MOID of 0.088981 AU (34.62 LD), and reports this object passed Earth at 36.4 LD on 29 Nov. 2006. Observations are reported from the following observatories in MPEC 2006-X29: Spacewatch 1.8m telescope [291] 2006-12-09 0946-0951, 2 pos. in MPEC 2006-X29, follow-up (t) See also information from the week ending 3 Dec. 2006. 2006 WH130 (K06WD0H) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 61 meters per JPL H=23.74, MPC H=23.8 JPL classifies 2006 WH130 as an Amor and calculates an Earth MOID of 0.089924 AU (34.99 LD), and reports this object passed Earth at 36.5 LD on 1 Dec. 2006. Lowell Observatory reports 2006 WH130 has an MOID of 0.02359 AU (9.18 LD) with Mars. Observations are reported from the following observatories in MPEC 2006-X22: Linz Obs. [540] 2006-12-07 1728-1734, 3 pos. in MPEC 2006-X22, follow-up See also information from the week ending 3 Dec. 2006. 2006 UA216 (K06UL6A) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 66 meters per JPL H=23.56, MPC H=23.6 JPL classifies 2006 UA216 as an Apollo and calculates an Earth MOID of 0.014266 AU (5.55 LD), and reports this object passed Earth at 6.0 LD on 31 Oct. 2006 at 0232 UT. Observations are reported from the following observatories in MPEC 2006-X29: Antares Obs. [H55] 2006-12-08 0517-0527, 3 pos. in MPEC 2006-X29, follow-up See also information from the week ending 26 Nov. 2006. 2005 RK3 (K05R03K) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 66 meters per JPL H=23.56, MPC H=23.7 JPL classifies 2005 RK3 as an Apollo and calculates an Earth MOID of 0.014796 AU (5.76 LD). Observations are reported from the following observatories in MPEC 2006-X27: SZTE Asteroid Program [461] 2005-09-06 2050-2054, 7 pos. in MPEC 2006-X27, follow-up 2006 WP3 (K06W03P) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 70 meters per JPL H=23.42, MPC H=23.4 JPL classifies 2006 WP3 as an Apollo and calculates an Earth MOID of 0.023419 AU (9.11 LD), and reports this object passed Earth at 9.1 LD on 12 Nov. 2006 at 0805 UT. Lowell Observatory reports 2006 WP3 has an MOID of 0.02773 AU (10.79 LD) with Mars. Observations are reported from the following observatories in MPECs 2006-X17 and 2006-X29: Hibiscus Obs. [F84] 2006-12-01 1231-1316, 2 pos. in MPEC 2006-X17, follow-up Spacewatch 1.8m telescope [291] 2006-12-09 0919-0933, 3 pos. in MPEC 2006-X29, follow-up (H) See also information from the week ending 3 Dec. 2006. 2005 QQ11 (K05Q11Q) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 110 meters per JPL H=22.45, MPC H=22.4 JPL classifies 2005 QQ11 as an Amor and calculates an Earth MOID of 0.196337 AU (76.40 LD). Lowell Observatory reports 2005 QQ11 has an MOID of 0.00962 AU (3.74 LD) with Mars. Observations are reported from the following observatories in MPEC 2006-X27: SZTE Asteroid Program [461] 2005-09-07 0011-0032, 2 pos. in MPEC 2006-X27, follow-up 2006 WK130 (K06WD0K) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 112 meters per JPL H=22.41, MPC H=22.4 This object has been listed as an impact risk since 29 Nov. 2006. JPL classifies 2006 WK130 as an Apollo and calculates an Earth MOID of 0.019874 AU (7.73 LD). Observations are reported from the following observatories in MPEC 2006-X27: Great Shefford Obs. [J95] 2006-12-09 0220-0244, 2 pos. in MPEC 2006-X27, follow-up See also information from the week ending 3 Dec. 2006. 2006 UF (K06U00F) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 115 meters per JPL H=22.34, MPC H=22.3 JPL classifies 2006 UF as an Amor and calculates an Earth MOID of 0.170317 AU (66.27 LD). Observations are reported from the following observatories in MPEC 2006-X13: Desert Moon Obs. [448] 2006-12-03 0606-0718, 3 pos. in MPEC 2006-X13, follow-up See also information from the week ending 26 Nov. 2006.
48 + 120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of ten small objects were reported during the last 168 hours: 2002 XT4, 2005 QQ11, 2005 RK3, 2006 UA216, 2006 UF, 2006 WH130, 2006 WK130, 2006 WP3, 2006 WR29 & 2006 WZ184 in MPECs: 2006-X13 time-stamped 2006 Dec. 4, 07:30 UT - Daily Orbit Update 2006-X17 time-stamped 2006 Dec. 5, 07:18 UT - Daily Orbit Update 2006-X20 time-stamped 2006 Dec. 7, 07:18 UT - Daily Orbit Update 2006-X22 time-stamped 2006 Dec. 8, 07:19 UT - Daily Orbit Update 2006-X27 time-stamped 2006 Dec. 9, 07:19 UT - Daily Orbit Update 2006-X29 time-stamped 2006 Dec. 10, 07:21 UT - Daily Orbit Update Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2006 Dec. 10, 1648 UTC JPL NEO Orbital Elements, downloaded at 2006 Dec. 10, 1637 UTC Lowell Observatory Orbit intersections, time-stamped 2006 Dec 02 1931:14 UTC MPC NEA.DAT from MPC mirror, downloaded at 2006 Dec. 10, 1514 UTC Risk monitoring sites, as of A/CC's check at 2006 Dec. 10, 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 28 small objects as being currently in view, including 21 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 WC30 2006-12-11 0.002260 47 24.28 6 - risk listed - past obs. - (2 Dec.) 2006 UE 2006-12-12 0.205867 107 22.50 26 - past obs. - (11 Nov.) 2006 VB45 2006-12-12 0.033213 43 24.50 8 - past obs. - (30 Nov.) 2006 VY2 2006-12-14 0.075098 94 22.79 14 - past obs. - (26 Nov.) 2006 WG130 2006-12-14 0.030492 41 24.57 2 - past obs. - (29 Nov.) 2006 SR19 2006-12-16 0.249457 136 21.98 58 - past obs. - (16 Nov.) 2006 WJ130 2006-12-16 0.035255 52 24.06 3 - past obs. - (3 Dec.) 2006 UT17 2006-12-19 0.092145 49 24.19 9 - was risk listed - past obs. - (1 Nov.) 2006 WZ184 2006-12-19 0.001895 21 25.99 11 - risk listed - (10 Dec.) 2006 WX3 2006-12-20 0.113694 116 22.33 10 - past obs. - (2 Dec.) 2006 WB 2006-12-21 0.004825 92 22.82 16 - risk listed - past obs. - (3 Dec.) 2006 WR29 2006-12-22 0.088981 56 23.89 17 - (10 Dec.) 2006 WM3 2006-12-23 0.002608 78 23.18 9 - was risk listed - past obs. - (30 Nov.) 1998 HG49 2006-12-24 0.076417 141 21.90 3op - past obs. - (22 Nov.) 2006 WB30 2006-12-24 0.063830 23 25.88 7 - past obs. - (2 Dec.) 2006 WH130 2006-12-26 0.089924 61 23.74 3 - (8 Dec.) 2004 XK14 2006-12-28 0.025499 120 22.25 15 - faint recov. poss. - (8 Nov.) 2006 UP 2006-12-28 0.112101 84 23.04 38 - past obs. - (24 Nov.) 2006 WP3 2006-12-28 0.023419 70 23.42 19 - (10 Dec.) 2006 TO 2006-12-30 0.183165 88 22.93 40 - was risk listed - past obs. - (12 Nov.) 2006 WK130 2006-12-30 0.019874 112 22.41 11 - risk listed - (9 Dec.) 2006 UA216 2006-12-30 0.014266 66 23.56 25 - (10 Dec.) 2006 VP13 2006-12-31 0.068105 67 23.52 12 - past obs. - (28 Nov.) 2006 BJ55 2007-01-02 0.027817 49 24.21 14 - faint recov. poss. - past obs. - (8 Nov.) 2006 SP198 2007-01-04 0.277259 146 21.83 56 - past obs. - (22 Nov.) 2006 UF 2007-01-11 0.170317 115 22.34 48 - (4 Dec.) 2006 SV5 2007-01-14 0.035513 80 23.13 46 - past obs. - (1 Nov.) 2005 CN 2007-01-25 0.029012 85 23.01 2op - past obs. - (6 Oct.) Coming into view soon: 2003 WP25 2007-02-07 0.023281 45 24.38 3op - >17 Dec. - (9 Dec.) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2006 WZ184 2006-12-19 0.001895 21 25.99 11 - risk listed - (10 Dec.) 2006 WK130 2006-12-30 0.019874 112 22.41 11 - risk listed - (9 Dec.) 2006 WJ130 2006-12-16 0.035255 52 24.06 3 - past obs. - (3 Dec.) 2006 WH130 2006-12-26 0.089924 61 23.74 3 - (8 Dec.) 2006 WG130 2006-12-14 0.030492 41 24.57 2 - past obs. - (29 Nov.) 2006 WC30 2006-12-11 0.002260 47 24.28 6 - risk listed - past obs. - (2 Dec.) 2006 WB30 2006-12-24 0.063830 23 25.88 7 - past obs. - (2 Dec.) 2006 WR29 2006-12-22 0.088981 56 23.89 17 - (10 Dec.) 2006 WX3 2006-12-20 0.113694 116 22.33 10 - past obs. - (2 Dec.) 2006 WP3 2006-12-28 0.023419 70 23.42 19 - (10 Dec.) 2006 WM3 2006-12-23 0.002608 78 23.18 9 - was risk listed - past obs. - (30 Nov.) 2006 WB 2006-12-21 0.004825 92 22.82 16 - risk listed - past obs. - (3 Dec.) 2006 VB45 2006-12-12 0.033213 43 24.50 8 - past obs. - (30 Nov.) 2006 VP13 2006-12-31 0.068105 67 23.52 12 - past obs. - (28 Nov.) 2006 VY2 2006-12-14 0.075098 94 22.79 14 - past obs. - (26 Nov.) 2006 UA216 2006-12-30 0.014266 66 23.56 25 - (10 Dec.) 2006 UT17 2006-12-19 0.092145 49 24.19 9 - was risk listed - past obs. - (1 Nov.) 2006 UP 2006-12-28 0.112101 84 23.04 38 - past obs. - (24 Nov.) 2006 UF 2007-01-11 0.170317 115 22.34 48 - (4 Dec.) 2006 UE 2006-12-12 0.205867 107 22.50 26 - past obs. - (11 Nov.) 2006 TO 2006-12-30 0.183165 88 22.93 40 - was risk listed - past obs. - (12 Nov.) 2006 SP198 2007-01-04 0.277259 146 21.83 56 - past obs. - (22 Nov.) 2006 SR19 2006-12-16 0.249457 136 21.98 58 - past obs. - (16 Nov.) 2006 SV5 2007-01-14 0.035513 80 23.13 46 - past obs. - (1 Nov.) 2006 BJ55 2007-01-02 0.027817 49 24.21 14 - faint recov. poss. - past obs. - (8 Nov.) 2005 CN 2007-01-25 0.029012 85 23.01 2op - past obs. - (6 Oct.) 2004 XK14 2006-12-28 0.025499 120 22.25 15 - faint recov. poss. - (8 Nov.) 2003 WP25 2007-02-07 0.023281 45 24.38 3op - >17 Dec. - (9 Dec.) 1998 HG49 2006-12-24 0.076417 141 21.90 3op - past obs. - (22 Nov.) 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
2002 XT4608
2005 QQ11461
2005 RK3461
2006 UA216H55
2006 UF448
2006 WH130540
2006 WK130J95
2006 WP3291, F84
2006 WR29291
2006 WZ184291, 734, J95
CodeObservatoryObjects Observed
291Spacewatch 1.8m telescope 2006 WP3, 2006 WR29, 2006 WZ184
448Desert Moon Obs. 2006 UF
461SZTE Asteroid Program 2005 QQ11, 2005 RK3
540Linz Obs. 2006 WH130
608NEAT's Haleakala telescope2002 XT4
734Farpoint Obs. 2006 WZ184
F84Hibiscus Obs. 2006 WP3
H55Antares Obs. 2006 UA216
J95Great Shefford Obs. 2006 WK130, 2006 WZ184
[ object listings | index | 48 Hours | viewing | top ]

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