123 Brunhild

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123 Brunhild
Discovery
Discovered by Christian Heinrich Friedrich Peters
Discovery date July 31, 1872
Designations
Named after
Brynhildr
Main belt
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 452.102 Gm (3.022 AU)
Perihelion 353.956 Gm (2.366 AU)
403.029 Gm (2.694 AU)
Eccentricity 0.122
1615.156 d (4.42 a)
18.08 km/s
38.416°
Inclination 6.428°
307.954°
124.933°
Physical characteristics
Dimensions 48[1] km
Mass 1.2×1017 kg (assumed)
0.0134 m/s²
0.0254 km/s
10.04 hr[1]
Albedo 0.2134[1]
Temperature ~170 K
Spectral type
S[1]
11.77 to 14.88
8.89[1]

123 Brunhild is a stony S-type main-belt asteroid. It was discovered by German-American astronomer C. H. F. Peters on July 31, 1872, and named after Brünnehilde, a Valkyrie in Norse mythology. Brunhild has been mistaken for the non-existent variable star KN Gem.[2]

In 1983, 123 Brunhild was observed photometrically from the Observatoire de Haute-Provence, producing an irregular light curve that showed eight extremes, including two minima and two maxima that were more accentuated than the others. This curve indicates an irregular shape or possibly areas with higher albedo, with a rotation period of 10.04 ± 0.02 hours and a brightness variation of 0.16 ± 0.01 in magnitude.[3]

Based upon IRAS observations, the estimated diameter of this asteroid is 47.97 ± 2.6 km with a geometric albedo of 0.2134 ± 0.026.[1] A smaller diameter value of 41.33 ± 1.73 km is obtained from the Midcourse Space Experiment observations, with an accordingly higher albedo of 0.2886 ± 0.0247.[4]

References

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External links

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