Physical characteristics (66391) 1999 KW4

1 physical characteristics

1.1 satellite
1.2 diameter , shape
1.3 lightcurves

physical characteristics

in smass classification, asteroid characterized s:-type, fall broader type of stony s-type asteroids.

satellite

simulated animation of 1999 kw4 binary system

1999 kw4 has minor-planet moon orbiting it. moon, designated s/2001 (66391) 1 approximately 360 metres in diameter, , orbits primary in every 16 hours @ mean-distance of 2.6 kilometers. presence of companion suggested photometric observations made pravec , Šarounová , confirmed radar observations arecibo observations , announced on 23 may 2001 (also see below).

diameter , shape

according radiometric observations arecibo observatory, asteroid has mean diameter of 1.317 kilometers. observations taken may 21–23, 2001, lance a. m. benner, steven j. ostro, jon d. giorgini, raymond f. jurgens, jean-luc margot , michael c. nolan.

the collaborative asteroid lightcurve link adopts diameter of 1.3 kilometers , derives albedo of albedo 0.26 absolute magnitude of 16.5.

the shapes of 2 bodies , dynamics complex. dimension of 1.5 x 1.5 x 1.34 kilometers simple triaxial ellipsoid, asteroid has oblate shape, dominated equatorial ridge @ body s potential-energy minimum. bizarre property of equatorial region close breakup: raising particle meter above surface put orbit. seen in image @ above right, gravitational effects between moon , asteroid create gigantic mountain extending in equatorial plane around entire asteroid.

lightcurves

during 19–27 june 2000, rotational lightcurve of asteroid obtained photometric observations petr pravec , lenka Šarounová @ ondřejov observatory. lightcurve analysis gave rotation period of 2.7650 hours brightness variation of 0.12 magnitude (u=3).

in september 2016, recent , poorly rated rotational lightcurve period of 7000958100000000000♠9.581±0.019 hours obtained spanish amateur astronomer group obas (u=1).