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 ]
- Note: This edition of daily/weekly small object news wraps it up for reporting in this format, something we began back in December 2005. This reporting will now be part of a new daily news publication that begins on May 14th.
- May 13 #2: Sunday Daily Orbit Update (DOU) MPEC 2007-J54 reports observations of three small asteroids. McDonald Observatory in Texas added about 41 days to 2007 EO's 23-day observing arc. Powell Observatory in Kansas provided the first follow-up for little observed 2007 JZ2, extending its arc to about three days. This object passes Earth tomorrow at seven lunar distances and soon goes out of view. And Guidestar Observatory in Germany reported 2007 JB21 from last night. Update: 2007 JB21 has been listed as an impact risk.
- May 13 #1: One minute into Sunday and the discovery of a small asteroid has been announced. 2007 JB21 was discovered from New Mexico by LINEAR Saturday morning and confirmed in the evening by Great Shefford and Bergen-Enkheim observatories in England and Germany.
- May 12: Discovery of small asteroid 2007 JG16 has been announced. It was found yesterday morning from Arizona by the Mt. Lemmon Survey, which caught this object again this morning along with Powell and Farpoint observatories in Kansas. No observations of small asteroids are reported in today's DOU MPEC.
- May 11 #2: Discovery of small asteroid 2007 JW9 has been announced, found yesterday morning from Arizona by the Mt. Lemmon Survey, which confirmed the discovery this morning along with Farpoint and McDonald observatories in Kansas and Texas.
- May 11 #1: On Friday, DOU MPEC 2007-J38 reports observation of one small asteroid. The Mt. Lemmon Survey added about eighteen days to the eight-day observing arc for 2007 GU4, which is calculated to go out of view for most NEO observers tomorrow but was reported by the MLS at V=22.1 yesterday.
- May 10 #2: Discovery of small asteroid 2007 JZ2 has been announced. It was discovered yesterday morning by the Mt. Lemmon Survey in Arizona, which alone confirmed it this morning. JPL reports that this object will pass Earth at 7.0 lunar distances on May 14th.
- May 10 #1: Thursday DOU MPEC 2007-J29 reports observations of three small asteroids. Powell Observatory in Kansas added about eleven days to 2007 HH44's four-day observing arc and ten days to 2007 HD84's three-day arc, and also provided the first post-discovery-arc astrometry for 2007 JD, which goes out of view in the next several days.
- May 9: On Wednesday, DOU MPEC 2007-J28 carries astrometry for one small asteroid. Remanzacco Observatory in Italy reported 2007 JD from within its discovery arc.
- May 8 #2: Tuesday's DOU MPEC 2007-J26 reports observation of one small asteroid, of 2007 FJ1 by Spacewatch in Arizona with its 1.8-meter telescope, adding about seventeen days to that object's former 34-day observing arc.
Large asteroid 1862 Apollo passes Earth at 27.8 lunar distances today. It is a well studied object and had been scheduled during this passage for more radar observation from Goldstone in southern California, but that was canceled due to maintenance.
- May 8 #1: Early on Tuesday the discovery of small asteroid 2007 JD has been announced, found yesterday by the Siding Spring Survey in Australia and confirmed last evening by Great Shefford Observatory in England and this morning by Sandlot Observatory in Kansas and Jim Young at Table Mountain Observatory in southern California.
- May 7: Monday DOU MPEC 2007-J22 reports observations of one small asteroid. Spacewatch in Arizona used its 1.8-meter telescope to add about eight days to 2007 HD15's six-day observing arc.
- See news from the week of 30 April to 6 May and from previous weeks. You also can look up reports on individual small asteroids.
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 ]
| Object | Observed by MPC code |
|---|
| 2007 EO | 711 |
| 2007 FJ1 | 291 |
| 2007 GU4 | G96 |
| 2007 HD15 | 291 |
| 2007 HD84 | 649 |
| 2007 HH44 | 649 |
| 2007 JB21 | 704, A17, A74, J95 |
| 2007 JD | 473, 649, 673, E12, H36, J95 |
| 2007 JG16 | 649, 734, G96 |
| 2007 JW9 | 711, 734, G96 |
| 2007 JZ2 | 649, G96 |
|
| Code | Observatory | Objects Observed |
|---|
| 291 | Spacewatch 1.8m telescope | 2007 FJ1, 2007 HD15 |
| 473 | Remanzacco Obs. | 2007 JD |
| 649 | Powell Obs. | 2007 HD84, 2007 HH44, 2007 JD, 2007 JG16, 2007 JZ2 |
| 6735 | Table Mountain Obs. - Jim Young | 2007 JD |
| 704 | LINEAR | 2007 JB21 |
| 711 | McDonald Obs. | 2007 EO, 2007 JW9 |
| 734 | Farpoint Obs. | 2007 JG16, 2007 JW9 |
| A17 | Guidestar Obs. | 2007 JB21 |
| A74 | Bergen-Enkheim Obs. | 2007 JB21 |
| E12 | Siding Spring Survey (SSS) | 2007 JD |
| G96 | Mt. Lemmon Survey (MLS) | 2007 GU4, 2007 JG16, 2007 JW9, 2007 JZ2 |
| H36 | Sandlot Obs. | 2007 JD |
| J95 | Great Shefford Obs. | 2007 JB21, 2007 JD |
|
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