323 Brucia
 |
|
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery date | 22 December 1891 |
| Designations | |
|
Named after
|
Catherine Wolfe Bruce |
| 1923 JA; 1934 JC | |
| Mars-crossing asteroid | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.73 yr (45191 d) |
| Aphelion | 3.0985 AU (463.53 Gm) |
| Perihelion | 1.6659 AU (249.22 Gm) |
| 2.3822 AU (356.37 Gm) | |
| Eccentricity | 0.30068 |
| 3.68 yr (1343.0 d) | |
|
Average orbital speed
|
18.9 km/s |
| 359.397° | |
| 0° 16m 5.016s / day | |
| Inclination | 24.230° |
| 97.403° | |
| 291.250° | |
| Earth MOID | 0.804221 AU (120.3097 Gm) |
| Jupiter MOID | 2.61843 AU (391.712 Gm) |
| Jupiter Tisserand parameter | 3.361 |
| Physical characteristics | |
| Dimensions | 35.82±1.7 km (IRAS) |
| Mass | 4.8×1016 kg (assumed) |
|
Mean density
|
2? g/cm³ |
|
Equatorial surface gravity
|
0.010 m/s² |
|
Equatorial escape velocity
|
0.019 km/s |
| 9.463 h (0.3943 d) | |
| 0.1765±0.018 | |
| Temperature | ~176 K |
| S | |
| 11.2 to 15.8 | |
| 9.73 | |
323 Brucia (/ˈbruːsiə/ BREW-see-ə or /ˈbruːʃə/ BREW-shə) was the first asteroid to be discovered by the use of astrophotography. It was also the first of over 200 asteroids discovered by Max Wolf, a pioneer in that method of finding astronomical objects. Discovered on December 22, 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 will be an outer Mars-crossing asteroid with perihelion (q) less than 1.666 AU until July 2017. For comparison, asteroid 4222 Nancita will become a Mars-crossing asteroid in June 2019. (6454) 1991 UG1 was a Mars-crossing asteroid until January 2016.
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