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Earth's Busy Neighborhood

    ACC's Small Object Report for 9 to 15 April 2007    

A semi-automated report compiled on 15 April 2007 at 2359 UTC

Seven small asteroids were reported in the last 168 hours, during which three were newly discovered.
Currently 1,294 NEAs are listed with H>22.0 by JPL and/or the MPC (1,111 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 GU1 (K07G01U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 38 meters per JPL H=24.73, MPC H=24.6 This object was listed from 11 until 12 April 2007 as an impact risk. JPL classifies 2007 GU1 as an Apollo and calculates an Earth MOID of 0.000060 AU (0.02 LD), and reports this object passes Earth at 2.1 lunar distances (LD) on 16 April 2007 at 0037 UT. Lowell Observatory reports 2007 GU1 has an MOID of 0.04539 AU (17.66 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-G28, 2007-G32, 2007-G39, and 2007-G45: Catalina Sky Survey (CSS) [703] 2007-04-11 0706-0850, 7 pos. in MPEC 2007-G28, discovery (*) Siding Spring Survey (SSS) [E12] 2007-04-11 1421-1457, 3 pos. in MPEC 2007-G28, confirmation 2007-04-11 1743-1748, 3 pos. in MPEC 2007-G32, follow-up Guidestar Obs. [A17] 2007-04-11 2015-2031, 3 pos. in MPEC 2007-G32, follow-up Remanzacco Obs. [473] 2007-04-11 2041-2049, 3 pos. in MPEC 2007-G32, follow-up 2007-04-13 2237-2249, 2 pos. in MPEC 2007-G45, follow-up Irmtraut Obs. [A21] 2007-04-12 0024-0041, 10 pos. in MPEC 2007-G39, follow-up Great Shefford Obs. [J95] 2007-04-12 0246-0302, 3 pos. in MPEC 2007-G32, follow-up 2007-04-13 0042-0052, 3 pos. in MPEC 2007-G39, follow-up KLENOT [246] 2007-04-13 0002-0008, 7 pos. in MPEC 2007-G39, follow-up 2007-04-13 2323-2325, 5 pos. in MPEC 2007-G45, follow-up Farra d'Isonzo Obs. [595] 2007-04-13 2237-2303, 3 pos. in MPEC 2007-G45, follow-up 2007 FJ1 (K07F01J) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 56 meters per JPL H=23.92, MPC H=23.9 JPL classifies 2007 FJ1 as an Amor and calculates an Earth MOID of 0.092259 AU (35.90 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-G45: KLENOT [246] 2007-04-13 0021-0032, 9 pos. in MPEC 2007-G45, follow-up See also information from the week ending 8 April 2007. 2007 GY1 (K07G01Y) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 105 meters per JPL H=22.55, MPC H=22.6 JPL classifies 2007 GY1 as an Apollo and calculates an Earth MOID of 0.009247 AU (3.60 LD), and reports this object passed Earth at 11.9 LD on 3 April 2007. Lowell Observatory reports 2007 GY1 has an MOID of 0.00191 AU (0.74 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-G30, 2007-G32, 2007-G39, and 2007-G45: LINEAR [704] 2007-04-11 0643-0737, 5 pos. in MPEC 2007-G30, prediscovery Catalina Sky Survey (CSS) [703] 2007-04-11 0648-0729, 3 pos. in MPEC 2007-G30, discovery (*) 2007-04-11 0842-0849, 4 pos. in MPEC 2007-G30, confirmation Farra d'Isonzo Obs. [595] 2007-04-11 1912-1934, 3 pos. in MPEC 2007-G30, confirmation KLENOT [246] 2007-04-11 1916-1920, 7 pos. in MPEC 2007-G30, confirmation 2007-04-12 2124-2130, 7 pos. in MPEC 2007-G39, follow-up 2007-04-13 2129-2139, 8 pos. in MPEC 2007-G45, follow-up Drebach Obs. [113] 2007-04-11 1920-1931, 3 pos. in MPEC 2007-G30, confirmation Remanzacco Obs. [473] 2007-04-11 1926-1952, 3 pos. in MPEC 2007-G30, confirmation Guidestar Obs. [A17] 2007-04-11 1926-1951, 3 pos. in MPEC 2007-G30, confirmation 2007-04-12 1929-1947, 3 pos. in MPEC 2007-G39, follow-up Heidelberg-Konigstuhl Obs. [024] 2007-04-11 1948-1953, 5 pos. in MPEC 2007-G30, confirmation Libbiano Obs. [B33] 2007-04-11 2113-2212, 4 pos. in MPEC 2007-G32, follow-up Petit Jean Mountain South Obs. [H45] 2007-04-12 0738-0750, 10 pos. in MPEC 2007-G39, follow-up NEAT's Mt. Palomar telescope [644] 2007-04-13 0717-0817, 3 pos. in MPEC 2007-G45, follow-up Mt. John Obs. [474] 2007-04-13 1027-1034, 3 pos. in MPEC 2007-G45, follow-up (b) 2007 GU4 (K07G04U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 107 meters per MPC H=22.5 This object has been listed as an impact risk since 15 April 2007. JPL reports this object passed Earth at 10.6 LD on 2 April 2007. The MPC reports this object has an Earth MOID of 0.0122 AU (4.7 LD) Observations are reported from the following observatories in MPEC 2007-G47: Catalina Sky Survey (CSS) [703] 2007-04-14 0826-0953, 7 pos. in MPEC 2007-G47, discovery (*) Heidelberg-Konigstuhl Obs. [024] 2007-04-14 1919-1933, 3 pos. in MPEC 2007-G47, confirmation Eschenberg Obs. [151] 2007-04-14 1930-1939, 3 pos. in MPEC 2007-G47, confirmation Farra d'Isonzo Obs. [595] 2007-04-14 1930-1948, 3 pos. in MPEC 2007-G47, confirmation Wildberg Obs. [198] 2007-04-14 1939-1950, 4 pos. in MPEC 2007-G47, confirmation Drebach Obs. [113] 2007-04-14 1950-1955, 3 pos. in MPEC 2007-G47, confirmation 2004 HZ (K04H00Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 119 meters per JPL H=22.27, MPC H=22.6 This object was listed from 20 April 2004 until 12 April 2007 as an impact risk. JPL classifies 2004 HZ as an Apollo and calculates an Earth MOID of 0.000006 AU (0.00 LD), and reports this object will pass Earth at 11.8 LD on 25 April 2007. Observations are reported from the following observatories in MPEC 2007-G31: Spacewatch 0.9m telescope [691] 2007-04-11 0818-0909, 3 pos. in MPEC 2007-G31, follow-up KLENOT [246] 2007-04-11 2240-2250, 5 pos. in MPEC 2007-G31, follow-up Farra d'Isonzo Obs. [595] 2007-04-11 2356-0007, 2 pos. in MPEC 2007-G31, follow-up Great Shefford Obs. [J95] 2007-04-12 0016-0048, 2 pos. in MPEC 2007-G31, follow-up 2007 EC (K07E00C) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 122 meters per JPL H=22.22, MPC H=22.2 JPL classifies 2007 EC as an Aten and calculates an Earth MOID of 0.024230 AU (9.43 LD). Observations are reported from the following observatories in MPECs 2007-G21 and 2007-G39: Spacewatch 1.8m telescope [291] 2007-04-08 0445-0457, 3 pos. in MPEC 2007-G21, follow-up (H) Mt. Lemmon Survey (MLS) [G96] 2007-04-12 0319-0321, 3 pos. in MPEC 2007-G39, follow-up See also information from the week ending 25 March 2007. 2007 CQ5 (K07C05Q) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 131 meters per JPL H=22.06, MPC H=22.1 This object was listed from 8 until 11 Feb. 2007 as an impact risk. JPL classifies 2007 CQ5 as an Amor and calculates an Earth MOID of 0.115338 AU (44.88 LD). Lowell Observatory reports 2007 CQ5 has an MOID of 0.03180 AU (12.37 LD) with Mars. Observations are reported from the following observatories in MPECs 2007-G21, 2007-G24, 2007-G32, and 2007-G39: Farra d'Isonzo Obs. [595] 2007-04-08 2348-0002, 2 pos. in MPEC 2007-G21, follow-up Wildberg Obs. [198] 2007-04-09 2237-2306, 4 pos. in MPEC 2007-G24, follow-up Catalina Sky Survey (CSS) [703] 2007-04-11 0656-0737, 3 pos. in MPEC 2007-G32, follow-up Lumezzane Obs. [130] 2007-04-12 0048-0106, 4 pos. in MPEC 2007-G39, follow-up Petit Jean Mountain South Obs. [H45] 2007-04-12 0904-0912, 6 pos. in MPEC 2007-G39, follow-up See also information from the week ending 1 April 2007.
48+120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of seven small objects were reported during the last 168 hours: 2004 HZ, 2007 CQ5, 2007 EC, 2007 FJ1, 2007 GU1, 2007 GU4 & 2007 GY1 in MPECs: 2007-G21 time-stamped 2007 Apr. 9, 06:07 UT - Daily Orbit Update 2007-G24 time-stamped 2007 Apr. 10, 06:07 UT - Daily Orbit Update 2007-G28 time-stamped 2007 Apr. 11, 17:32 UT - 2007 GU1 2007-G30 time-stamped 2007 Apr. 11, 21:12 UT - 2007 GY1 2007-G31 time-stamped 2007 Apr. 12, 03:49 UT - 2004 HZ 2007-G32 time-stamped 2007 Apr. 12, 06:07 UT - Daily Orbit Update 2007-G39 time-stamped 2007 Apr. 13, 06:07 UT - Daily Orbit Update 2007-G45 time-stamped 2007 Apr. 14, 06:07 UT - Daily Orbit Update 2007-G47 time-stamped 2007 Apr. 14, 20:25 UT - 2007 GU4 Date & times for other sources that were parsed to compile this page: JPL Close Approaches, downloaded at 2007 April 14, 2333 UTC JPL NEO Orbital Elements, downloaded at 2007 April 14, 1445 UTC Lowell Observatory Orbit intersections, time-stamped 2007 Apr 15 1541:01 UTC MPC NEA.DAT from MPC mirror, downloaded at 2007 April 14, 1437 UTC Risk monitoring sites, as of A/CC's check at 2007 April 15, 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 22 small objects as being currently in view, including 16 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 FO3 2007-04-16 0.040957 42 24.52 1 - past obs. (22 March) 2007 FQ3 2007-04-16 0.060338 25 25.65 2 - was risk listed, past obs. (22 March) 2005 GR33 2007-04-17 0.011936 132 22.04 12 - faint recov. poss. (10 Feb.) 2007 GU1 2007-04-17 0.000060 38 24.73 3 - was risk listed (14 April) 2006 YD12 2007-04-19 0.044509 101 22.63 60 - past obs. (22 Feb.) 2002 EW8 2007-04-19 0.042484 69 23.46 2op - past obs. (21 March) 2006 BA9 2007-04-20 0.072674 91 22.86 32 - faint recov. poss., past obs. (10 Feb.) 2004 RE84 2007-04-26 0.019895 132 22.05 28 - bright recov. poss. (10 Feb.) 2007 DX 2007-04-30 0.213746 87 22.95 25 - past obs. (15 March) 2004 HZ 2007-05-01 0.000006 119 22.27 2op - was risk listed (12 April) 2006 KK89 2007-05-03 0.101248 109 22.46 2 - faint recov. poss., past obs. (10 Feb.) 1995 SB 2007-05-05 0.279024 123 22.20 12 - faint recov. poss. (3 Jan.) 2003 WW26 2007-05-05 0.011964 122 22.21 23 - was risk listed, faint recov. poss. (10 Feb.) 2007 GY1 2007-05-11 0.009247 105 22.55 3 - (14 April) 2007 EC 2007-05-13 0.024230 122 22.22 41 - (13 April) 2000 UY33 2007-05-16 0.118567 133 22.03 144 - faint recov. poss. (10 Feb.) 2007 FJ1 2007-05-19 0.092259 56 23.92 27 - (14 April) 2000 HO40 2007-05-20 0.039459 124 22.19 10 - faint recov. poss. (10 Feb.) 2007 BC8 2007-05-26 0.039473 119 22.28 49 - past obs. (14 March) 2007 EO 2007-06-09 0.039430 94 22.78 23 - past obs. (3 April) 2007 CQ5 2007-06-23 0.115338 131 22.06 64 - was risk listed (13 April) 2006 SY5 2007-09-15 0.104669 129 22.10 62 - past obs. (2 April) Coming into view soon: 2002 FT6 2007-05-02 0.041002 120 22.26 3op - >20 April, very faint (2 April) Viewing by designation order - see also Viewing by date order Object View until MOID AU Dia H Arc Notes (calc date) ---------- ---------- -------- --- ----- --- - ----------------------- 2007 GY1 2007-05-11 0.009247 105 22.55 3 - (14 April) 2007 GU1 2007-04-17 0.000060 38 24.73 3 - was risk listed (14 April) 2007 FQ3 2007-04-16 0.060338 25 25.65 2 - was risk listed, past obs. (22 March) 2007 FO3 2007-04-16 0.040957 42 24.52 1 - past obs. (22 March) 2007 FJ1 2007-05-19 0.092259 56 23.92 27 - (14 April) 2007 EO 2007-06-09 0.039430 94 22.78 23 - past obs. (3 April) 2007 EC 2007-05-13 0.024230 122 22.22 41 - (13 April) 2007 DX 2007-04-30 0.213746 87 22.95 25 - past obs. (15 March) 2007 CQ5 2007-06-23 0.115338 131 22.06 64 - was risk listed (13 April) 2007 BC8 2007-05-26 0.039473 119 22.28 49 - past obs. (14 March) 2006 YD12 2007-04-19 0.044509 101 22.63 60 - past obs. (22 Feb.) 2006 SY5 2007-09-15 0.104669 129 22.10 62 - past obs. (2 April) 2006 KK89 2007-05-03 0.101248 109 22.46 2 - faint recov. poss., past obs. (10 Feb.) 2006 BA9 2007-04-20 0.072674 91 22.86 32 - faint recov. poss., past obs. (10 Feb.) 2005 GR33 2007-04-17 0.011936 132 22.04 12 - faint recov. poss. (10 Feb.) 2004 RE84 2007-04-26 0.019895 132 22.05 28 - bright recov. poss. (10 Feb.) 2004 HZ 2007-05-01 0.000006 119 22.27 2op - was risk listed (12 April) 2003 WW26 2007-05-05 0.011964 122 22.21 23 - was risk listed, faint recov. poss. (10 Feb.) 2002 FT6 2007-05-02 0.041002 120 22.26 3op - >20 April, very faint (2 April) 2002 EW8 2007-04-19 0.042484 69 23.46 2op - past obs. (21 March) 2000 UY33 2007-05-16 0.118567 133 22.03 144 - faint recov. poss. (10 Feb.) 2000 HO40 2007-05-20 0.039459 124 22.19 10 - faint recov. poss. (10 Feb.) 1995 SB 2007-05-05 0.279024 123 22.20 12 - faint recov. poss. (3 Jan.) 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
2004 HZ246, 595, 691, J95
2007 CQ5130, 198, 595, 703, H45
2007 EC291, G96
2007 FJ1246
2007 GU1246, 473, 595, 703, A17, A21, E12, J95
2007 GU4024, 113, 151, 198, 595, 703
2007 GY1024, 113, 246, 473, 474, 595, 644, 703, 704, A17, B33, H45
CodeObservatoryObjects Observed
024Heidelberg-Konigstuhl Obs. 2007 GU4, 2007 GY1
113Drebach Obs. 2007 GU4, 2007 GY1
130Lumezzane Obs. 2007 CQ5
151Eschenberg Obs. 2007 GU4
198Wildberg Obs. 2007 CQ5, 2007 GU4
246KLENOT 2004 HZ, 2007 FJ1, 2007 GU1, 2007 GY1
291Spacewatch 1.8m telescope 2007 EC
473Remanzacco Obs. 2007 GU1, 2007 GY1
474Mt. John Obs. 2007 GY1
595Farra d'Isonzo Obs. 2004 HZ, 2007 CQ5, 2007 GU1, 2007 GU4, 2007 GY1
644NEAT's Mt. Palomar telescope 2007 GY1
691Spacewatch 0.9m telescope 2004 HZ
703Catalina Sky Survey2007 CQ5, 2007 GU1, 2007 GU4, 2007 GY1
704LINEAR 2007 GY1
A17Guidestar Obs. 2007 GU1, 2007 GY1
A21Irmtraut Obs. 2007 GU1
B33Libbiano Obs. 2007 GY1
E12Siding Spring Survey2007 GU1
G96Mt. Lemmon Survey2007 EC
H45Petit Jean Mtn. South Obs. 2007 CQ5, 2007 GY1
J95Great Shefford Obs. 2004 HZ, 2007 GU1
[ object listings | index | 48 Hours | viewing | top ]

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