Earth's Busy Neighborhood
ACC's Small Object Report for 29 Jan.-4 Feb. 2007
A semi-automated report compiled on 4 February 2007 at 2359 UTC
Eight small asteroids* were reported in the last 168 hours, during which none were newly discovered.
*This week's reporting also includes two asteroids just outside the small classification.
Currently 1,226 NEAs are listed with H>22.0 by JPL and/or the MPC (1,044 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 ]
- Feb. 4: Sunday Daily Orbit Update (DOU) MPEC 2007-C12 reports observations of two small asteroids. Great Shefford Observatory in England tracked 2007 BC8 and 2007 BZ48, and Schiaparelli Observatory in Itay also reported 2007 BC8 from January 28th. Additionally, smallish
2006 UQ17 was observed by Petit Jean Mountain South in Arkansas.
- Feb. 3: The Saturday DOU MPEC 2007-C11 carries observations of three small asteroids. Great Shefford Observatory in England provided the first follow-up for 2007 BZ48, adding about six days to its one-day observing arc, and also added about three days to what had been 2007 BC8's eight-day arc. And David Tholen's team on Mauna Kea in Hawaii reported 2007 BJ from within its nine-day arc.
Two almost-small asteroids are reported in the DOU from Japan -- 2006 AM4 from the Bisei Spaceguard Center and 2006 UQ17 from Hadano Observatory.
- Feb. 2: With the full Moon it is no surprise on Friday that only four objects of any size are reported in DOU MPEC 2007-C10. One of them is not-quite-small 2006 UQ17, which was observed from Castelmartini Observatory in Italy on January 29th.
- Feb. 1: Thursday DOU MPEC 2007-C01 reports no observations of small asteroids, but does have astrometry for the two almost-small objects that have been being reported here almost daily -- 2006 AM4 from Schiaparelli Observatory in Italy on the 28th and this morning and 2006 UQ17 from Petit Jean Mountain South Observatory in Arkansas yesterday. 2006 AM4 was at its closest this morning for this year's encounter, passing Earth at 5.2 lunar distances, and will go out of view for ground-based optical telescapes after today. The JPL 2006 AM4 Planning page reports that this object was successfully observed by radar yesterday from Goldstone in southern California.
- Jan. 31: DOU MPEC 2007-B78 on Wednesday reports observations of two small asteroids. Great Shefford Observatory in England this morning added about five days to 2007 BU7's two-day observing arc, and Sandlot and Naef observatories in Kansas and Switzerland tracked 2007 BC8. Also reported is smallish 2006 UQ17 from Verona and New Millenium observatories in Italy from early and late this month.
- Jan. 30 #2: It is reported on the JPL 2006 AM4 Planning page that "Mike Nolan and Lynn Carter observed 2006 AM4 at Arecibo on January 29 [and] obtained stronger SNRs than expected." Furthermore, "Photometry reported by Carl Hergenrother and Mike Hicks indicate that 2006 AM4 is an extremely rapid rotator." Goldstone is scheduled to observe 2006 AM4 tomorrow as it heads to its closest approach of 5.2 lunar distances on February 1st, and Arecibo may make further observations, too.
- Jan. 30 #1: Tuesday's DOU MPEC 2007-B73 reports observations of two small asteroids, including the recovery of 2003 WP25 on its fourth opposition. It was picked up by Antares Observatory in Illinois early on the 26th UT. And the Catalina Sky Survey (CSS) in Arizona tracked 2007 BC8.
Two almost-small asteroids were well covered, with 2006 AM4 reported from New Millennium and GiaGa observatories in Italy, the Mt. Lemmon Survey in Arizona, and Hamamatsu-Yuto Observatory in Japan. And 2006 UQ17 was observed by Greiner Research Observatory in Wisconsin, New Millenium, CSS, and Naef Observatory in Switzerland.
Addendum: A check of the IAU Minor Planet Center's orbital elements shows that 2003 WP25 has today become only the third asteroid classified as small by the MPC to be observed at a fourth opposition. It reached this milestone thanks both to observing work and to work in the archives, with an uncredited precovery reported in a January 2004 DOU MPEC. The two others with four oppositions include 1998 XN17, which was in the first hundred or so small asteroids to be discovered (read about the very first), and 54509 2000 PH5, which is the only numbered small asteroid and has been described as being co-orbital with Earth. Out of the 1,066 asteroids classified as small by the MPC as of today, 1,030 have been observed at only one opposition, 28 at two oppositions, and five at three oppositions. An opportunity to pick up 54509 2000 PH5 at a first-ever fifth opposition was missed last Summer.
- Jan. 29: Monday DOU MPEC 2007-B67 carries astrometry for four small asteroids. From its previously reported three-hour-plus observing run on 2007 BD of 17-18 January, Gnosca Observatory in Switzerland reported a new set of 27 positions. This intruder is calculated to go out of view for most NEO observers today and was last reported observed January 20th, so it is difficult target with only a four-day observing arc but may be recoverable with a large telescope until mid-February.
Also reported in the DOU are 2007 AS2, observed from the Mt. Lemmon Survey (MLS) in Arizona, 2007 BS2 from the Spacewatch 1.8-meter telescope in Arizona, and 2007 BC8 from Parma Observatory in Italy.
In the category of not-quite-small asteroids, approaching radar target 2006 AM4 was followed by the MLS and by Petit Jean Mountain South Observatory in Arkansas, and Petit Jean observed 2006 UQ17.
- See news from the week of 22-28 January and from previous weeks, and you also can look up individual small asteroids.
Object Listings -- smallest objects first [ Alpha Index | 48 Hours | top ]
2007 BZ48 (K07B48Z) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 22 meters per JPL H=25.96, MPC H=25.9
JPL classifies 2007 BZ48 as an Apollo and calculates an Earth MOID of 0.005281 AU (2.05 LD),
and reports this object will pass Earth at 4.5 lunar distances (LD) on 7 Feb. 2007 at 0954 UT.
Lowell Observatory reports 2007 BZ48 has an MOID of 0.02945 AU (11.46 LD) with Mars.
Observations are reported from the following observatories in MPECs 2007-C11 and 2007-C12:
Great Shefford Obs. [J95]
2007-02-02 2222-2246, 4 pos. in MPEC 2007-C11, follow-up
2007-02-03 2254-2300, 3 pos. in MPEC 2007-C12, follow-up
See also information from the week ending 28 Jan. 2007.
2007 BD (K07B00D) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 22 meters per JPL H=25.89, 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 0.02867 AU (11.16 LD) with Mercury.
Observations are reported from the following observatories in MPEC 2007-B67:
Gnosca Obs. [143]
2007-01-17 2115-0023, 27 pos. in MPEC 2007-B67, follow-up
See also information from the week ending 21 Jan. 2007.
2007 BU7 (K07B07U) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 45 meters per JPL H=24.36, MPC H=24.1
JPL classifies 2007 BU7 as an Aten and calculates an Earth MOID of 0.009805 AU (3.82 LD),
and reports this object passed Earth at 4.2 LD on 19 Jan. 2007 at 1823 UT.
Lowell Observatory reports 2007 BU7 has an MOID of 0.02224 AU (8.65 LD) with Venus.
Observations are reported from the following observatories in MPEC 2007-B78:
Great Shefford Obs. [J95]
2007-01-31 0000-0017, 2 pos. in MPEC 2007-B78, follow-up (B)
See also information from the week ending 28 Jan. 2007.
2003 WP25 (K03W25P) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 47 meters per JPL H=24.30, MPC H=24.3
JPL classifies 2003 WP25 as an Aten and calculates an Earth MOID of 0.023420 AU (9.11 LD).
Observations are reported from the following observatories in MPEC 2007-B73:
Antares Obs. [H55]
2007-01-26 0207-0236, 3 pos. in MPEC 2007-B73, follow-up
2007 BS2 (K07B02S) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 72 meters per JPL H=23.35, MPC H=23.3
JPL classifies 2007 BS2 as an Amor and calculates an Earth MOID of 0.133782 AU (52.06 LD).
Observations are reported from the following observatories in MPEC 2007-B67:
Spacewatch 1.8m telescope [291]
2007-01-28 0803-0815, 3 pos. in MPEC 2007-B67, follow-up
See also information from the week ending 28 Jan. 2007.
2007 BJ (K07B00J) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 95 meters per JPL H=22.77, MPC H=22.6
JPL classifies 2007 BJ as an Apollo and calculates an Earth MOID of 0.082727 AU (32.19 LD),
and reports this object passed Earth at 32.7 LD on 16 Jan. 2007.
Observations are reported from the following observatories in MPEC 2007-C11:
Mauna Kea [568{2}] coded to David Tholen et al.
2007-01-25 0800-0836, 4 pos. in MPEC 2007-C11, follow-up
See also information from the week ending 28 Jan. 2007.
2007 BC8 (K07B08C) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 120 meters per JPL H=22.25, MPC H=22.4
JPL classifies 2007 BC8 as an Amor and calculates an Earth MOID of 0.039466 AU (15.36 LD),
and reports this object will pass Earth at 33.9 LD on 8 Feb. 2007.
Lowell Observatory reports 2007 BC8 has an MOID of 0.03210 AU (12.49 LD) with Mars.
Observations are reported from the following observatories in MPECs 2007-B67, 2007-B73,
2007-B78, 2007-C11, and 2007-C12:
Parma Obs. [A56]
2007-01-28 0112-0142, 3 pos. in MPEC 2007-B67, follow-up
Schiaparelli Obs. [204]
2007-01-28 0309-0321, 3 pos. in MPEC 2007-C12, follow-up
Catalina Sky Survey (CSS) [703]
2007-01-29 0944-1007, 4 pos. in MPEC 2007-B73, follow-up
Sandlot Obs. [H36]
2007-01-30 1053-1108, 5 pos. in MPEC 2007-B78, follow-up
Naef Obs. [A13]
2007-01-30 2240-2309, 2 pos. in MPEC 2007-B78, follow-up
Great Shefford Obs. [J95]
2007-02-03 0316-0341, 3 pos. in MPEC 2007-C11, follow-up
2007-02-04 0240-0250, 3 pos. in MPEC 2007-C12, follow-up
See also information from the week ending 28 Jan. 2007.
2007 AS2 (K07A02S) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 128 meters per JPL H=22.12, MPC H=22.2
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 0.041677 AU (16.22 LD),
and reports this object passed Earth at 31.7 LD on 5 Jan. 2007.
Observations are reported from the following observatories in MPEC 2007-B67:
Mt. Lemmon Survey (MLS) [G96]
2007-01-28 0414-0534, 7 pos. in MPEC 2007-B67, follow-up
See also information from the week ending 28 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=21.8 -- 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 passed 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-B67, 2007-B73,
2007-C01, and 2007-C11:
Schiaparelli Obs. [204]
2007-01-28 0154-0203, 5 pos. in MPEC 2007-C01, follow-up
2007-02-01 0227-0229, 5 pos. in MPEC 2007-C01, follow-up
Mt. Lemmon Survey (MLS) [G96]
2007-01-28 0946-1117, 8 pos. in MPEC 2007-B67, follow-up
2007-01-29 1312-1316, 4 pos. in MPEC 2007-B73, follow-up
Petit Jean Mountain South Obs. [H45]
2007-01-28 1039-1046, 8 pos. in MPEC 2007-B67, follow-up
New Millennium Obs. [A24]
2007-01-28 2134-2134, 1 pos. in MPEC 2007-B73, follow-up
GiaGa Obs. [203]
2007-01-29 0012-0024, 2 pos. in MPEC 2007-B73, follow-up
Hamamatsu-Yuto Obs. [379]
2007-01-29 1511-1527, 4 pos. in MPEC 2007-B73, follow-up
Bisei Spaceguard Center [300]
2007-01-30 1909-1917, 10 pos. in MPEC 2007-C11, follow-up
See also information from the week ending 28 Jan. 2007.
2006 UQ17 (K06U17Q) [ JPL Orbit Viewer | NEODyS object home | news | viewing | index | top ]
Size estimate: 141 meters per JPL H=21.90, 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-B67, 2007-B73,
2007-B78, 2007-C01, 2007-C10, 2007-C11, and 2007-C12:
Verona Obs. [A48]
2007-01-03 2055-2059, 4 pos. in MPEC 2007-B78, follow-up
Hadano Obs. [355]
2007-01-08 1616-1625, 5 pos. in MPEC 2007-C11, follow-up
Greiner Research Obs. [H51]
2007-01-27 0400-0425, 3 pos. in MPEC 2007-B73, follow-up
Petit Jean Mountain South Obs. [H45]
2007-01-28 1000-1009, 6 pos. in MPEC 2007-B67, follow-up
2007-01-31 0921-0928, 5 pos. in MPEC 2007-C01, follow-up
2007-02-03 0859-0905, 2 pos. in MPEC 2007-C12, follow-up
New Millennium Obs. [A24]
2007-01-28 2036-2129, 3 pos. in MPEC 2007-B73, follow-up
2007-01-29 2253-2346, 4 pos. in MPEC 2007-B78, follow-up
Catalina Sky Survey (CSS) [703]
2007-01-29 0907-0927, 4 pos. in MPEC 2007-B73, follow-up
Naef Obs. [A13]
2007-01-29 2010-2225, 4 pos. in MPEC 2007-B73, follow-up
Castelmartini Obs. [160]
2007-01-30 2144-2158, 6 pos. in MPEC 2007-C10, follow-up
See also information from the week ending 28 Jan. 2007.
48+120 Hours [ Objects Listings (size order) | Object Index (alpha/xref) | top ]
Observations of eight small objects were reported during the last 168 hours:
2003 WP25, 2007 AS2, 2007 BC8, 2007 BD, 2007 BJ, 2007 BS2, 2007 BU7 & 2007 BZ48,
as well as almost-small 2006 AM4 & 2006 UQ17
in MPECs:
2007-B67 time-stamped 2007 Jan. 29, 07:08 UT - Daily Orbit Update
2007-B73 time-stamped 2007 Jan. 30, 07:08 UT - Daily Orbit Update
2007-B78 time-stamped 2007 Jan. 31, 07:08 UT - Daily Orbit Update
2007-C01 time-stamped 2007 Feb. 1, 07:10 UT - Daily Orbit Update
2007-C10 time-stamped 2007 Feb. 2, 07:10 UT - Daily Orbit Update
2007-C11 time-stamped 2007 Feb. 3, 07:09 UT - Daily Orbit Update
2007-C12 time-stamped 2007 Feb. 4, 07:06 UT - Daily Orbit Update
Date & times for other sources that were parsed to compile this page:
JPL Close Approaches, downloaded at 2007 Feb. 4, 1534 UTC
JPL NEO Orbital Elements, downloaded at 2007 Feb. 4, 1608 UTC
Lowell Observatory Orbit intersections, time-stamped 2007 Jan 31 1854:59 UTC
MPC NEA.DAT from MPC mirror, downloaded at 2007 Feb. 4, 2052 UTC
Risk monitoring sites, as of A/CC's check at 2007 Feb. 4, 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 13 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 BU7 2007-02-08 0.009805 45 24.36 7 - (31 Jan.)
2003 WP25 2007-02-09 0.023420 47 24.30 4op - "only 1 night" (30 Jan.)
2007 BZ48 2007-02-12 0.005281 22 25.96 7 - (3 Feb.)
2006 XP4 2007-02-14 0.004110 55 23.93 41 - was risk listed, past obs. (24 Jan.)
2007 AA9 2007-02-16 0.015157 131 22.06 9 - past obs. (23 Jan.)
2006 XY2 2007-02-18 0.182560 104 22.56 28 - past obs. (11 Jan.)
2007 BD8 2007-02-19 0.031041 42 24.52 3 - past obs. (3 Feb.)
2006 YJ2 2007-02-21 0.092313 127 22.13 31 - past obs. (24 Jan.)
2002 VX91 2007-02-23 0.001376 51 24.12 2op - (3 Dec.)
2007 BY48 2007-02-23 0.029385 107 22.51 2 - past obs. (28 Jan.)
2007 AS2 2007-02-24 0.041677 128 22.12 19 - was risk listed (29 Jan.)
2006 XY 2007-02-25 0.006952 54 24.00 19 - past obs. (16 Jan.)
2007 BA49 2007-02-25 0.058156 38 24.76 1 - past obs. (28 Jan.)
2006 YH14 2007-03-12 0.091097 75 23.26 31 - past obs. (14 Jan.)
2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.)
2007 BS2 2007-03-20 0.133782 72 23.35 11 - (29 Jan.)
2000 PN8 2007-03-26 0.079762 127 22.13 26 - bright recov. poss. (3 Dec.)
2006 UQ17 2007-04-03 0.022315 141 21.90 128 - was risk listed (4 Feb.)
2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.)
2007 BC8 2007-05-27 0.039466 120 22.25 11 - (3 Feb.)
Viewing by designation order - see also Viewing by date order
Object View until MOID AU Dia H Arc Notes (calc date)
---------- ---------- -------- --- ----- --- - -----------------------
2007 BA49 2007-02-25 0.058156 38 24.76 1 - past obs. (28 Jan.)
2007 BZ48 2007-02-12 0.005281 22 25.96 7 - (3 Feb.)
2007 BY48 2007-02-23 0.029385 107 22.51 2 - past obs. (28 Jan.)
2007 BD8 2007-02-19 0.031041 42 24.52 3 - past obs. (3 Feb.)
2007 BC8 2007-05-27 0.039466 120 22.25 11 - (3 Feb.)
2007 BU7 2007-02-08 0.009805 45 24.36 7 - (31 Jan.)
2007 BS2 2007-03-20 0.133782 72 23.35 11 - (29 Jan.)
2007 AA9 2007-02-16 0.015157 131 22.06 9 - past obs. (23 Jan.)
2007 AS2 2007-02-24 0.041677 128 22.12 19 - was risk listed (29 Jan.)
2006 YH14 2007-03-12 0.091097 75 23.26 31 - past obs. (14 Jan.)
2006 YD12 2007-04-18 0.044382 102 22.61 7 - past obs. (30 Dec.)
2006 YJ2 2007-02-21 0.092313 127 22.13 31 - past obs. (24 Jan.)
2006 XP4 2007-02-14 0.004110 55 23.93 41 - was risk listed, past obs. (24 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 - past obs. (16 Jan.)
2006 UQ17 2007-04-03 0.022315 141 21.90 128 - was risk listed (4 Feb.)
2004 BK11 2007-03-20 0.279416 106 22.52 29 - faint recov. poss. (3 Dec.)
2003 WP25 2007-02-09 0.023420 47 24.30 4op - "only 1 night" (30 Jan.)
2002 VX91 2007-02-23 0.001376 51 24.12 2op - (3 Dec.)
2000 PN8 2007-03-26 0.079762 127 22.13 26 - bright 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 ]
| Object | Observed by MPC code |
|---|
| 2003 WP25 | H55 |
| 2006 AM4 | 203, 204, 300, 379, A24, G96, H45 |
| 2006 UQ17 | 160, 355, 703, A13, A24, A48, H45, H51 |
| 2007 AS2 | G96 |
| 2007 BC8 | 204, 703, A13, A56, H36, J95 |
| 2007 BD | 143 |
| 2007 BJ | 568 |
| 2007 BS2 | 291 |
| 2007 BU7 | J95 |
| 2007 BZ48 | J95 |
|
|
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