390 Alma

Minor Planet | name=390 Alma
discoverer=Guillaume Bigourdan
discovery_date=March 24, 1894
designations=1894 BC; 1930 QW;
1950 BV; 1950 CH;
1953 YB; 1963 DF
category=Main belt (Eunomia family)
epoch=30 January, 2005 (JD 2453400.5)
semimajor=396.89 Gm (2.653 AU)
perihelion=345.512 Gm (2.31 AU)
aphelion=448.268 Gm (2.996 AU)
eccentricity=0.129
period=1578.364 d (4.32 a)
inclination=12.144°
asc_node=305.342°
arg_peri=190.074°
mean_anomaly=258.381°
speed=18.21 km/s
dimensions=24 km ^{[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab]}
mass=~2×10¹⁶ kg "(estimate)"
density=~2.7 g/cm³ "(estimate)" ^{[#Krasinsky02| [3]}
gravity=~0.009 m/s² "(estimate)"
escape_velocity=~0.015 km/s "(estimate)"
rotation=0.156 d ^{[http://www.psi.edu/pds/archive/lc.html]}
spectral_class=S-type asteroid
abs_mag=10.39
albedo=0.219
temperature=~165 K
"max:" 250 K (-23 °C)

390 Alma is a typical medium sized Main belt asteroid of the Eunomia family.

It was Guillaume Bigourdan's only asteroid discovery. He discovered it on March 24, 1894 in Paris.

References

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[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey]

# [http://www.psi.edu/pds/archive/lc.html PDS lightcurve data]
#

G. A. Krasinsky et al "Hidden Mass in the Asteroid Belt", Icarus, Vol. 158, p. 98 (2002).