Asteroid Radar Highlights 1968 first radar detection of an asteroid (1566 Icarus) 1975 radar-based ellipsoid model of 433 Eros 1977 first radar detection of a main-belt asteroid (1 Ceres) 1978 a total of five asteroids have been detected with radar 1980 Radar-based ellipsoid model of 1685 Toro 1980 first radar ranging to an Earth-crossing asteroid (1862 Apollo) 1984 2102 Adonis -- extremely unusual echo polarization establishes extreme diversity of NEA surface properties 1985 first delay-doppler images of an asteroid (1627 Ivar) 1985 first mainbelt asteroid radar survey (20 objects) 1986 Goldstone observations of 1986 JK at 11 lunar distances 1986 1986 DA's high reflectivity implies metallic composition 1987 simulations establish power of radar for NEA orbit refinement 1988 development of spectra-to-hull shape inversion 1989 1989 PB (4769 Castalia) - first good radar movie of an asteroid reveals contact-binary shape 1992 first publication of radar-refined NEA orbits 1992 Toutatis: first detailed asteroid images show a cratered object in a non-principal-axis spin state. First international radar experiment (Evpatoria-Effelsberg). 1994 radar-derived many-parameter shape model of Castalia (1989 PB) 1994 Geographos: radar reveals extreme elongation 1995 Golevka: radar reveals object with sharp edges, corners, flat sides indicating a collision fragment. First intercontinental radar obsns use Golevka. (Goldstone-Evpatoria and Goldstone-Kashima) 1996 orbits close to Castalia studied using radar-derived model 1998 Arecibo returns to operation after five-year upgrade 1998 1998 KY26: radar/optical observations reveal extremely rapid rotation (11-min) implying "monolithic" object. With a 30-m diameter, this is smallest object investigated in detail. 1999 1999 JM8: best NEA images yet reveal NPA rotator with abundant surface craters 1999 1999 RQ36 imaged and found to be a featureless spheroid 1999 radar survey of 37 MBAs 2000 radar-based physical model of Golevka 2000 4486 Mithra imaged and found to be contact binary with NPA rotation 2000 mainbelt asteroid 216 Kleopatra: dogbone shape and metallic composition 2000 discovery of binary asteroids in the NEO population 2001 extraordinarily slow (~50-day) rotation of mainbelt asterid 288 Glauke 2001 imaging of Itokawa, target of Japan's Hayabusa sample-return mission 2001 high-resolution images of the 1999 KW4 binary system 2001 1998 ST27: discovery of dynamical diversity of NEA binary systems 2002 radar discovery of possibly hazardous close approach of 1950 DA in 2880 2003 high-resolution (34-meter) shape model of Toutatis 2003 radar detection of Yarkovsky acceleration of Golevka 2004 detection stats: 252 asteroids (161 NEAs + 91 MBAs), 92 PHAs, 15 BINs 2005 radar refinement of the 2029 miss distance of Apophis 2005 radar discovery of Apollo's satellite 2005 radar confirmation of binary nature of 1139 Atami 2005 radar detection of Deimos: ultra-low surface bulk density 2006 2005 CR37: best radar movie yet of a candidate contact binary 2006 radar model of Betulia: unusual dynamical stability zones 2006 radar survey of 55 MBAs 2006 1999 KW4: Exotic physical properties and excited dynamics 2007 54509 YORP (2000 PH5): Spin rate increasing due to YORP effect 2008 Near-Earth asteroid surface roughness depends on compositional class 2008 2001 SN263: Discovery of the first triple near-Earth asteroid 2008 (May): radar echoes have been detected from 337 asteroids: 222 NEAs (130 PHAs, 24 binaries) and 118 MBAs