288 Glauke

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=288 Glauke
discoverer=Robert Luther
discovered= February 20, 1890
alt_names=1955 MO; 1959 GB; 1961 WF
mp_category=Main belt
epoch=October 22, 2004 (JD 2453300.5)
semimajor=412.314 Gm (2.756 AU)
perihelion=325.456 Gm (2.176 AU)
aphelion=499.173 Gm (3.337 AU)
eccentricity=0.211
period=1671.295 d (4.58 a)
inclination=4.330°
asc_node=120.591°
arg_peri=83.174°
mean_anomaly=332.837°
avg_speed=17.74 km/s
dimensions=32.2 km
mass=3.5×10¹⁶ kg
density=2.0 ? g/cm³
surface_grav=0.0090 m/s²
escape_velocity=0.0170 km/s
rotation=50 d [http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm ¹]
spectral_type=SK
abs_magnitude=9.84
albedo=0.1973 [http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab ²]
single_temperature=~115 K

288 Glauke (pronEng|ˈɡlɔːki "glaw'-kee") is an asteroid discovered by Robert Luther in 1890. It was the last of his asteroid discoveries. It is named after Glauke, a daughter of Creon in Greek mythology.

Glauke has an exceptionally slow rotation period of about 1200 hours (50 days). This makes it the slowest-rotating non-planetary object known in the solar system (both Mercury and Venus rotate more slowly). The rotation is believed to be "tumbling", similar to 4179 Toutatis.