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 24 March 1894
Designations
MPC designation (390) Alma
Named after
Alma River
1894 BC; 1930 QW;
1950 BV; 1950 CH;
1953 YB; 1963 DF
Main belt (Eunomia family)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 122.02 yr (44568 d)
Aphelion 3.00211 AU (449.109 Gm)
Perihelion 2.29906 AU (343.934 Gm)
2.65059 AU (396.523 Gm)
Eccentricity 0.13262
4.32 yr (1576.2 d)
18.21 km/s
136.953°
0° 13m 42.229s / day
Inclination 12.1645°
305.223°
190.194°
Earth MOID 1.31305 AU (196.429 Gm)
Jupiter MOID 2.06833 AU (309.418 Gm)
Jupiter Tisserand parameter 3.346
Physical characteristics
Dimensions 23.74±1.4 km[1]
24 km[2]
Mass ~2×1016 kg (estimate)
Mean density
~2.7 g/cm³ (estimate)[3]
Equatorial surface gravity
~0.009 m/s² (estimate)
Equatorial escape velocity
~0.015 km/s (estimate)
3.74 h (0.156 d)[1]
0.156 d[4]
0.2190±0.029
Temperature ~165 K
max: 250 K (-23 °C)
S-type asteroid
10.39

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

References[edit]

  1. ^ a b c "390 Alma (1894 BC)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016. 
  2. ^ "Supplemental IRAS Minor Planet Survey". Archived from the original on 2006-06-23. 
  3. ^ G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. doi:10.1006/icar.2002.6837. 
  4. ^ "PDS lightcurve data". Archived from the original on 2006-06-14. 

External links[edit]