390 Alma

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390 Alma
390Alma (Lightcurve Inversion).png
A three-dimensional model of 390 Alma based on its light curve.
Discovery
Discovered by Guillaume Bigourdan
Discovery date March 24, 1894
Designations
Named after
Alma River
1894 BC; 1930 QW;
1950 BV; 1950 CH;
1953 YB; 1963 DF
Minor planet category Main belt (Eunomia family)
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion 448.268 Gm (2.996 AU)
Perihelion 345.512 Gm (2.31 AU)
396.89 Gm (2.653 AU)
Eccentricity 0.129
1578.364 d (4.32 a)
18.21 km/s
258.381°
Inclination 12.144°
305.342°
190.074°
Physical characteristics
Dimensions 24 km[1]
Mass ~2×1016 kg (estimate)
Mean density
~2.7 g/cm³ (estimate)[3]
~0.009 m/s² (estimate)
~0.015 km/s (estimate)
0.156 d [2]
Albedo 0.219
Temperature ~165 K
max: 250 K (-23 °C)
Spectral type
S-type asteroid
10.39

390 Alma is a typical medium-sized Eunomian asteroid. It was Guillaume Bigourdan's only asteroid discovery. He discovered it on March 24, 1894 in Paris.

References[edit]

  1. PDS lightcurve data
  2. G. A. Krasinsky et al. Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).