323 Brucia

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323 Brucia
Discovered by Max Wolf
Discovery date December 22, 1891
Named after Catherine Wolfe Bruce
Alternative names 1923 JA; 1934 JC[1]
Minor planet category Main belt (Mars-crosser)
Orbital characteristics[1]
Epoch 30 January 2005 (JD 2453400.5)
Aphelion 463.848 Gm (3.101 AU)
Perihelion 248.71 Gm (1.663 AU)
Semi-major axis 356.279 Gm (2.382 AU)
Eccentricity 0.302
Orbital period 1342.443 d (3.68 a)
Average orbital speed 18.9 km/s
Mean anomaly 313.443°
Inclination 24.227°
Longitude of ascending node 97.463°
Argument of perihelion 291.344°
Physical characteristics
Dimensions 35.8 ± 1.7 km (IRAS)[1]
Mass 4.8×1016 kg (assumed)
Mean density 2? g/cm³
Equatorial surface gravity 0.010 m/s²
Escape velocity 0.019 km/s
Rotation period 0.394 d (9.46 h)[1]
Albedo 0.1765[1]
Temperature ~176 K
Spectral type S[1]
Apparent magnitude 11.2 to 15.8
Absolute magnitude (H) 9.73[1]

323 Brucia (/ˈbrsiə/ BREW-see-ə or /ˈbrʃə/ BREW-shə) was the first asteroid to be discovered by the use of astrophotography.[2] It was also the first of over 200 asteroids discovered by Max Wolf, a pioneer in that method of finding astronomical objects. Discovered in 1891, it was named in honour of Catherine Wolfe Bruce, a noted patroness of the science of astronomy, who had donated $10,000 for the construction of the telescope used by Wolf.

It is also a Mars-crosser asteroid.[1]


  1. ^ a b c d e f g h i "JPL Small-Body Database Browser: 323 Brucia". Jet Propulsion Laboratory. 2011-06-24 last obs. Retrieved 2005-01-30. 
  2. ^ Campbell, W. W. (1892). "Discovery of Asteroids by Photography". Publications of the Astronomical Society of the Pacific 4 (26): 264. Bibcode:1892PASP....4..264C. doi:10.1086/120521. 

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