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Earth's Busy Neighborhood

    ACC's Small Object 7-Day Report    

A semi-automated report compiled on 13 May 2007 at 2359 UTC

Eleven small asteroids were reported in the last 168 hours, during which five were newly discovered.
Currently 1,313 NEAs are listed with H>22.0 by JPL and/or the MPC (1,130 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 JZ2 (K07J02Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 22 meters per JPL H=25.92, MPC H=25.9 JPL classifies 2007 JZ2 as an Apollo and calculates an Earth MOID of 0.012913 AU (5.02 LD), and reports this object passes Earth at 7.0 lunar distances (LD) on 14 May 2007 at about 2041 UT. Observations are reported from the following observatories in MPECs 2007-J34 and 2007-J54: Mt. Lemmon Survey (MLS) [G96] 2007-05-09 0740-0855, 8 pos. in MPEC 2007-J34, discovery (*) 2007-05-10 0812-0840, 3 pos. in MPEC 2007-J34, confirmation Powell Obs. [649] 2007-05-12 0755-0805, 3 pos. in MPEC 2007-J54, follow-up 2007 JB21 (K07J21B) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 32 meters per MPC H=25.1 This object has been listed as an impact risk since 13 May 2007. Observations are reported from the following observatories in MPECs 2007-J53 and 2007-J54: LINEAR [704] 2007-05-12 0735-0829, 5 pos. in MPEC 2007-J53, discovery (*) Guidestar Obs. [A17] 2007-05-12 2213-2233, 3 pos. in MPEC 2007-J54, follow-up Great Shefford Obs. [J95] 2007-05-12 2236-2240, 3 pos. in MPEC 2007-J53, confirmation Bergen-Enkheim Obs. [A74] 2007-05-12 2247-2254, 4 pos. in MPEC 2007-J53, confirmation 2007 HH44 (K07H44H) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 34 meters per JPL H=25.01, MPC H=25.0 This object was listed from 26 until 28 April 2007 as an impact risk. JPL classifies 2007 HH44 as an Amor and calculates an Earth MOID of 0.040218 AU (15.65 LD), and reports this object passed Earth at 22.4 LD on 9 May 2007. Observations are reported from the following observatories in MPEC 2007-J29: Powell Obs. [649] 2007-05-09 0444-0502, 4 pos. in MPEC 2007-J29, follow-up See also information from the week ending 29 April 2007. 2007 JW9 (K07J09W) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 44 meters per JPL H=24.45, MPC H=24.4 JPL classifies 2007 JW9 as an Amor and calculates an Earth MOID of 0.135418 AU (52.69 LD). Observations are reported from the following observatories in MPEC 2007-J47: Mt. Lemmon Survey (MLS) [G96] 2007-05-10 0805-0916, 8 pos. in MPEC 2007-J47, discovery (*) 2007-05-11 0657-0727, 4 pos. in MPEC 2007-J47, confirmation Farpoint Obs. [734] 2007-05-11 0440-0534, 4 pos. in MPEC 2007-J47, confirmation McDonald Obs. [711] 2007-05-11 0608-0629, 3 pos. in MPEC 2007-J47, confirmation (FI) 2007 HD15 (K07H15D) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 51 meters per JPL H=24.10, MPC H=24.1 This object was listed from 24 until 28 April 2007 as an impact risk. JPL classifies 2007 HD15 as an Apollo and calculates an Earth MOID of 0.002293 AU (0.89 LD), and reports this object passed Earth at 4.7 LD on 13 April 2007 at 1220 UT. Observations are reported from the following observatories in MPEC 2007-J22: Spacewatch 1.8m telescope [291] 2007-05-06 1048-1116, 3 pos. in MPEC 2007-J22, follow-up See also information from the week ending 29 April 2007. 2007 JG16 (K07J16G) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 56 meters per MPC H=23.9 Observations are reported from the following observatories in MPEC 2007-J50: Mt. Lemmon Survey (MLS) [G96] 2007-05-11 0924-1022, 8 pos. in MPEC 2007-J50, discovery (*) 2007-05-12 0841-0857, 3 pos. in MPEC 2007-J50, confirmation Powell Obs. [649] 2007-05-12 0709-0745, 3 pos. in MPEC 2007-J50, confirmation Farpoint Obs. [734] 2007-05-12 0821-0924, 3 pos. in MPEC 2007-J50, confirmation 2007 FJ1 (K07F01J) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 57 meters per JPL H=23.88, MPC H=23.9 JPL classifies 2007 FJ1 as an Amor and calculates an Earth MOID of 0.092168 AU (35.86 LD), and reports this object passed Earth at 36.4 LD on 23 March 2007. Observations are reported from the following observatories in MPEC 2007-J26: Spacewatch 1.8m telescope [291] 2007-05-07 1025-1042, 3 pos. in MPEC 2007-J26, follow-up (H) See also information from the week ending 22 April 2007. 2007 HD84 (K07H84D) [ 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 2007 HD84 as an Amor and calculates an Earth MOID of 0.125451 AU (48.81 LD). Observations are reported from the following observatories in MPEC 2007-J29: Powell Obs. [649] 2007-05-09 0407-0428, 5 pos. in MPEC 2007-J29, follow-up See also information from the week ending 6 May 2007. 2007 JD (K07J00D) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 81 meters per JPL H=23.10, MPC H=23.1 JPL classifies 2007 JD as an Apollo and calculates an Earth MOID of 0.000950 AU (0.37 LD), and reports this object passed Earth at 11.8 LD on 11 May 2007. Observations are reported from the following observatories in MPECs 2007-J24, 2007-J28, and 2007-J29: Siding Spring Survey (SSS) [E12] 2007-05-07 1416-1447, 3 pos. in MPEC 2007-J24, discovery (*) 2007-05-07 1556-1618, 5 pos. in MPEC 2007-J24, confirmation Great Shefford Obs. [J95] 2007-05-07 2128-2141, 5 pos. in MPEC 2007-J24, confirmation Remanzacco Obs. [473] 2007-05-07 2141-2144, 3 pos. in MPEC 2007-J28, follow-up Sandlot Obs. [H36] 2007-05-08 0329-0338, 5 pos. in MPEC 2007-J24, confirmation Table Mountain Obs. [673{5}] coded to Jim Young 2007-05-08 0402-0423, 4 pos. in MPEC 2007-J24, confirmation Powell Obs. [649] 2007-05-09 0254-0302, 5 pos. in MPEC 2007-J29, follow-up 2007-05-09 0552-0605, 8 pos. in MPEC 2007-J29, follow-up 2007 EO (K07E00O) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 94 meters per JPL H=22.78, MPC H=22.8 JPL classifies 2007 EO as an Amor and calculates an Earth MOID of 0.039430 AU (15.34 LD), and reports this object passed Earth at 20.7 LD on 17 March 2007. Observations are reported from the following observatories in MPEC 2007-J54: McDonald Obs. [711] 2007-05-12 0949-1025, 3 pos. in MPEC 2007-J54, follow-up (F) See also information from the week ending 8 April 2007. 2007 GU4 (K07G04U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 107 meters per JPL H=22.50, MPC H=22.5 This object was listed from 15 until 16 April 2007 as an impact risk. JPL classifies 2007 GU4 as an Apollo and calculates an Earth MOID of 0.017586 AU (6.84 LD), and reports this object passed Earth at 11.0 LD on 2 April 2007. Observations are reported from the following observatories in MPEC 2007-J38: Mt. Lemmon Survey (MLS) [G96] 2007-05-10 0516-0554, 4 pos. in MPEC 2007-J38, follow-up See also information from the week ending 22 April 2007.
48+120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of eleven small objects were reported during the last 168 hours: 2007 EO, 2007 FJ1, 2007 GU4, 2007 HD15, 2007 HD84, 2007 HH44, 2007 JB21, 2007 JD, 2007 JG16, 2007 JW9 & 2007 JZ2 in MPECs: 2007-J22 time-stamped 2007 May 7, 06:06 UT - Daily Orbit Update 2007-J24 time-stamped 2007 May 8, 04:36 UT - 2007 JD 2007-J26 time-stamped 2007 May 8, 06:07 UT - Daily Orbit Update 2007-J28 time-stamped 2007 May 9, 06:07 UT - Daily Orbit Update 2007-J29 time-stamped 2007 May 10, 06:08 UT - Daily Orbit Update 2007-J34 time-stamped 2007 May 10, 18:43 UT - 2007 JZ2 2007-J38 time-stamped 2007 May 11, 06:08 UT - Daily Orbit Update 2007-J47 time-stamped 2007 May 11, 16:18 UT - 2007 JW9 2007-J50 time-stamped 2007 May 12, 13:54 UT - 2007 JG16 2007-J53 time-stamped 2007 May 13, 00:01 UT - 2007 JB21 2007-J54 time-stamped 2007 May 13, 06:08 UT - Daily Orbit Update Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2007 May 13, 0003 UTC JPL NEO Orbital Elements, downloaded at 2007 May 13, 1415 UTC MPC NEA.DAT from MPC mirror, downloaded at 2007 May 13, 1403 UTC Risk monitoring sites, as of A/CC's check at 2007 May 13, 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 17 small objects as being currently in view, including 8 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 JD 2007-05-14 0.000950 81 23.10 2 - (10 May) 2007 JZ2 2007-05-17 0.012913 22 25.92 3 - (13 May) 2007 FJ1 2007-05-19 0.092168 57 23.88 51 - (8 May) 2000 HO40 2007-05-20 0.039459 124 22.19 10 - faint recov. poss. (10 Feb.) 2007 HH44 2007-05-22 0.040218 34 25.01 15 - was risk listed (10 May) 2000 UY33 2007-05-24 0.118565 133 22.03 2op - "only 1 night", past obs. (28 April) 2007 BC8 2007-05-26 0.039473 119 22.28 49 - past obs. (14 March) 2007 JB21 2007-05-28 0.0009 32 25.1 1 - risk listed (13 May) 2007 JW9 2007-06-01 0.135418 44 24.45 1 - (10 May) 2007 EO 2007-06-09 0.039430 94 22.78 64 - (13 May) 2007 HL4 2007-06-20 0.032605 48 24.23 3 - past obs. (23 April) 2007 CQ5 2007-06-23 0.115337 128 22.11 79 - was risk listed, past obs. (5 May) 2007 HD84 2007-06-26 0.125451 66 23.55 13 - (10 May) 2004 KH17 2007-06-28 0.004017 139 21.94 16 - faint recov. poss. (2 April) 2007 JG16 2007-08-08 0.0744 56 23.9 1 - (12 May) 2006 SY5 2007-09-15 0.104669 129 22.10 62 - past obs. (2 April) 2004 LK 2007-10-13 0.068107 99 22.68 78 - faint recov. poss. (2 April) Coming into view soon: 2004 NF3 2007-08-06 0.056805 44 24.42 11 - >21 May, faint recov. poss. (2 April) 2006 FH36 2007-08-28 0.016417 87 22.94 55 - >17 May, faint recov. poss., past obs. (2 April) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2007 JB21 2007-05-28 0.0009 32 25.1 1 - risk listed (13 May) 2007 JG16 2007-08-08 0.0744 56 23.9 1 - (12 May) 2007 JW9 2007-06-01 0.135418 44 24.45 1 - (10 May) 2007 JZ2 2007-05-17 0.012913 22 25.92 3 - (13 May) 2007 JD 2007-05-14 0.000950 81 23.10 2 - (10 May) 2007 HD84 2007-06-26 0.125451 66 23.55 13 - (10 May) 2007 HH44 2007-05-22 0.040218 34 25.01 15 - was risk listed (10 May) 2007 HL4 2007-06-20 0.032605 48 24.23 3 - past obs. (23 April) 2007 FJ1 2007-05-19 0.092168 57 23.88 51 - (8 May) 2007 EO 2007-06-09 0.039430 94 22.78 64 - (13 May) 2007 CQ5 2007-06-23 0.115337 128 22.11 79 - was risk listed, past obs. (5 May) 2007 BC8 2007-05-26 0.039473 119 22.28 49 - past obs. (14 March) 2006 SY5 2007-09-15 0.104669 129 22.10 62 - past obs. (2 April) 2006 FH36 2007-08-28 0.016417 87 22.94 55 - >17 May, faint recov. poss., past obs. (2 April) 2004 NF3 2007-08-06 0.056805 44 24.42 11 - >21 May, faint recov. poss. (2 April) 2004 LK 2007-10-13 0.068107 99 22.68 78 - faint recov. poss. (2 April) 2004 KH17 2007-06-28 0.004017 139 21.94 16 - faint recov. poss. (2 April) 2000 UY33 2007-05-24 0.118565 133 22.03 2op - "only 1 night", past obs. (28 April) 2000 HO40 2007-05-20 0.039459 124 22.19 10 - faint recov. poss. (10 Feb.) 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
2007 EO711
2007 FJ1291
2007 GU4G96
2007 HD15291
2007 HD84649
2007 HH44649
2007 JB21704, A17, A74, J95
2007 JD473, 649, 673, E12, H36, J95
2007 JG16649, 734, G96
2007 JW9711, 734, G96
2007 JZ2649, G96
CodeObservatoryObjects Observed
291Spacewatch 1.8m telescope 2007 FJ1, 2007 HD15
473Remanzacco Obs. 2007 JD
649Powell Obs. 2007 HD84, 2007 HH44, 2007 JD, 2007 JG16, 2007 JZ2
6735Table Mountain Obs. - Jim Young2007 JD
704LINEAR 2007 JB21
711McDonald Obs. 2007 EO, 2007 JW9
734Farpoint Obs. 2007 JG16, 2007 JW9
A17Guidestar Obs. 2007 JB21
A74Bergen-Enkheim Obs. 2007 JB21
E12Siding Spring Survey (SSS) 2007 JD
G96Mt. Lemmon Survey (MLS) 2007 GU4, 2007 JG16, 2007 JW9, 2007 JZ2
H36Sandlot Obs. 2007 JD
J95Great Shefford Obs. 2007 JB21, 2007 JD
[ object listings | index | 48 Hours | viewing | top ]

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