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123 Brunhild information


123 Brunhild
Discovery
Discovered byChristian Heinrich Friedrich Peters
Discovery date31 July 1872
Designations
MPC designation
(123) Brunhild
Pronunciation/ˈbrnhɪld/[1]
Named after
Brynhildr
Alternative designations
A872 OB
Minor planet category
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc143.71 yr (52490 days)
Aphelion3.0183 AU (451.53 Gm)
Perihelion2.37594 AU (355.436 Gm)
Semi-major axis
2.69710 AU (403.480 Gm)
Eccentricity0.11907
Orbital period (sidereal)
4.43 yr (1617.9 d)
Average orbital speed
18.08 km/s
Mean anomaly
96.8286°
Mean motion
0° 13m 21.054s / day
Inclination6.4142°
Longitude of ascending node
307.834°
Argument of perihelion
125.960°
Earth MOID1.39621 AU (208.870 Gm)
Jupiter MOID2.22588 AU (332.987 Gm)
TJupiter3.350
Physical characteristics
Dimensions48 km[2]
Mean radius
23.985±1.3 km
Mass1.2×1017 kg (assumed)
Equatorial surface gravity
0.0134 m/s2
Equatorial escape velocity
0.0254 km/s
Synodic rotation period
10.04 h (0.418 d)[2]
Geometric albedo
0.2134±0.026[2]
Temperature~170 K
Spectral type
S[2]
Apparent magnitude
11.77 to 14.88
Absolute magnitude (H)
8.9[2]

Brunhild (minor planet designation: 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.[3]

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.[4]

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.[2] 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.[5]

  1. ^ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  2. ^ a b c d e f g Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference KN Gem was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Barucci1984 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Tedesco2002 was invoked but never defined (see the help page).

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