| Minorplanet: | yes |
| 323 Brucia | |
| Background: |
|
| Discovery Ref: |   |
| Discovered: | 22 December 1891 |
| Mpc Name: | (323) Brucia |
| Alt Names: | 1934 JCA923 JA |
| Named After: | Catherine Wolfe Bruce  |
| Mp Category: | main-belt |
| Orbit Ref: |   |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 125.35 yr (45,785 days) |
| Perihelion: | 1.6662 AU |
| Semimajor: | 2.3820 AU |
| Eccentricity: | 0.3005 |
| Period: | 3.68 yr (1,343 days) |
| Mean Motion: | / day |
| Inclination: | 24.230° |
| Asc Node: | 97.398° |
| Arg Peri: | 291.26° |
| Mars Moid: | 0.3464 AU |
| Dimensions: | |
| Rotation: | |
| Albedo: | |
| Spectral Type: | Tholen S  B–V 0.893 U–B 0.480 |
| Abs Magnitude: | 9.73 |
323 Brucia is a stony Phocaea asteroid and former Mars-crosser from the inner regions of the asteroid belt, approximately 33abbr=offNaNabbr=off in diameter. It was the first asteroid to be discovered by the use of astrophotography.
Brucia 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, when he was 28 years old, 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.
The asteroid is a member of the Phocaea family, a large family of stony S-type asteroids with nearly two thousand known members. It was an outer Mars-crossing asteroid with perihelion less than 1.666 AU until July 2017. For comparison, asteroid 4222 Nancita will become a Mars-crosser in June 2019. was a Mars-crossing asteroid until January 2016.[1]
Brucia has a synodic rotation period of 9.463 hours (as of 1998). According to the survey carried out by the Infrared Astronomical Satellite, Brucia measures 35.82 kilometers in diameter and its surface has an albedo of 0.1765.