Very Small Radar-Detected Near-Earth Asteroids: D < 200 m
Last modified: 2009 October 14
http://echo.jpl.nasa.gov/~lance/small.neas.html
Objects with H > 21 (diameters less than about 200 meters):
Absolute
magnitude 2x vis rng Diameter (m) Rotation
Asteroid Horizons MPC extent (m) pv=0.05 pv=0.2 Period (h) SC/OC Reference
-------- -------- --- ---------- ------- ------ ---------- ----- ---------
1998 BY7 21.5 21.5 NA 300 150 <1.3 0.4 +/-0.04 9 PHA
1998 KY26 25.5 25.5 30* 48 24 0.178 0.5 +/-0.1 3
1999 FN19 22.4 22.5 110 190 95 <11 0.22+/-0.01 5
1999 MN 21.6 7 PHA
1999 NW2 23.1 23.1 NA 150 72 <4.2 0.35+/-0.02 5
1999 TN13 23.6 23.6 NA 120 57 <1.3 5
1999 TY2 23.3 23.3 NA 130 66 0.121 4, 8
2000 EH26 21.2 21.8 120 260 130 <33 1 PHA
2000 EW70 21.1 21.1 360 360 180 <33 7 PHA
2000 LF3 21.6 21.6 NA 300 150 <1.0 <0.2 8 PHA
54509 YORP 22.3 22.6 120 170 90 0.288 0.29+/-0.02 7, 10 2000 PH5
2000 UK11 25.0 25.3 <60 52 26 ~0.05 2
2000 YA 23.7 23.6 120 110 52 <1.3 1
2001 AV43 24.3 24.7 NA 72 36 8
2001 BF10 22.3 22.6 NA 170 83 <0.4 6
2001 CP36 23.7 23.7 90 110 55 slow? ~1.0 8
2001 EC16 22.2 22.3 150 200 100 slow ~0.2 7
2001 FR85 24.5 24.8 ? 79 40 8
2001 JV1 21.3 21.3 ? 320 160 <29 9 PHA
2001 SP263 25.6 25.8 42 21 8
2001 UP 25.7 25.7 44 22 8
2001 WM15 25.0 25.0 60 30 8
2001 XX4 21.9 22.1 250 130 8
2001 YP3 21.9 22.2 250 130 8 PHA
2002 AA29 24.1 24.3 0.25+/-0.08 12
2002 AV 20.7 21.0 380 190 9 PHA
2002 FD6 22.3 21.6 110 210 110 ~1 h 5
2002 TS69 24.4 24.6 80 40 8
2002 TZ66 25.9 25.7 40 20 <1.1 0.0+/-0.16 5
2003 EP4 23.7 23.9 8
2003 HM 21.7 22.2 8
2003 HN16 22.0 22.5 8
2003 MS2 21.3 21.3 380 330 170 ~6? ~0.5 5 PHA
2003 QB30 26.3 26.3 33 17 11
2003 RU11 25.6 25.6 46 23 fast 8
2003 SR84 25.2 26.0 5
2003 SS84 21.7 21.8 275 138 8, 13 PHA BINARY
2003 TH2 22.8 22.8 6
2004 AD 24.3 24.3 6
2004 FY31 21.9 21.9 251 126 very fast 5 PHA
2004 HX53 23.0 23.5 8
2004 XL14 21.4 21.4 14 PHA
2005 EU2 22.8 23.1 ~300 6,5
2005 FA 25.2 25.2 8
2005 HB4 24.4 24.4 8
2005 TD49 26.4 26.5 8
2005 TU50 21.5 21.5 8 PHA
2005 WA1 21.6 21.5 8 PHA
2005 WK56 22.6 22.6 8
2005 XA 26.1 26.1 8
2006 AM4 21.8 21.9 8, 13 PHA
2006 QV89 25.2 25.3 8
2006 RH120 29.6 5 (6R10DB9)
2006 UQ17 21.9 21.9 8 PHA
2006 WB 22.8 22.8 150 14
2007 EH 27.6 27.7 8
2007 FY20 24.8 6
2009 DO111 22.8 15
2009 DR3 21.5 15 PHA
N = 59 (59/248) = 23.8% of all radar-detected NEAs)
Number that are PHAs: 17
Number that are NOT PHAs: 42 (because H > 22)
Percentage of small radar-detected NEAs that are binaries: 1/57 = 2%
Note: NEA satellites < 200 m in diameter are not included.
NA = visible range extent is not available (was not measured).
* = 3-D shape model diameter was used (1998 KY26 only).
Diameters are listed assuming C-type (0.05) and S-type (0.20) optical geometric albedos,
except for 1998 K26, for which a 3-D shape model is available.
In the rotation period estimates, if rotation periods have not been reported in
the peer-reviewed literature or in personal communications, in most cases
an optical albedo of 0.05 was assumed and was used to estimate an upper bound
on the diameter. That upper bound and the bandwidth were used to estimate
upper bounds on the rotation periods. With 1999 NW2, M. Hicks (pers. comm.)
obtained photometric colors indicating an SQ-type composition, so an optical
albedo of 0.2 was assumed to estimate the diameter and to constrain the
rotation period.
The upper bound on the rotation period of 2000 YA from radar observations is
consistent with the periods estimated from photometry by P. Pravec. Pravec's
period is ambiguous by a factor of two (1.3 h or 0.65 h).
2000 EW70 is included because it has H > 21.0 even though it has a visible range
extent of about 180 meters.
REFERENCES
----------
1. Benner, L. A. M., M. C. Nolan, J.-L. Margot, J. D. Giorgini, R. S. Hudson, R. F. Jurgens,
and S. J. Ostro 2001. Recent radar observations of four near-Earth asteroids.
Bull. Am. Astron. Soc. 33, 918. [Abstract]
2. Nolan, M. C., J.-L. Margot, E. S. Howell, L. A. M. Benner, S. J. Ostro, R. F. Jurgens,
J. D. Giorgini, and D. B. Campbell 2001. Radar observations of near-Earth asteroids
2000 UG11 and 2000 UK11. Lunar Planet Sci. XXXII, #2055. [Abstract]
3. Ostro, S. J., P. Pravec, L. A. M. Benner, R. S. Hudson, L. Sarounova, M. D. Hicks, D. L. Rabinowitz,
J. V. Scotti, D. J. Tholen, M. Wolf, R. F. Jurgens, M. L. Thomas, J. D. Giorgini, P. W. Chodas,
D. K. Yeomans, R. Rose, R. Frye, K. D. Rosema, R. Winkler, and M. A. Slade 1999. Radar and
optical observations of asteroid 1998 KY26. Science 285, 557-559.
4. Pravec, P., C. Hergenrother, R. Whiteley, L. Sarounova, P. Kusnirak, and M. Wolf 2000.
Fast rotating asteroids 1999 TY2, 1999 SF10, and 1998 WB2. Icarus 147, 477-486.
5. Benner, L. A. M, et al., unpublished.
6. Howell, E. S., et al., unpublished.
7. Margot, J.-L., et al., unpublished.
8. Nolan, M. C., et al., unpublished.
9. Ostro, S. J., et al., unpublished.
10.Sarounova, L., et al., unpublished.
11.Shepard, M. K., et al., unpublished.
12.Ostro, S. J., J. D. Giorgini, L. A. M. Benner, A. A. Hine, M. C. Nolan, J. L. Margot, P. W.
Chodas, and C. Veillet 2003. Radar detection of asteroid 2002 AA29. Icarus, in press.
13.Nolan, M. C., A. A. Hine, E. S. Howell, L. A. M. Benner 2003 2003 SS84. IAU Circ. No. 8220.
14. Busch, M. W., et al., unpublished.
15. Brozovic, M., et al. , unpublished
Lance Benner
Last modified: Thu Dec 14 13:24:39 PST 2006