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Discovery
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| Discovered by | Édouard Stephan |
| Discovery date | August 6, 1866 |
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Designations
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| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 451.576 Gm (3.019 AU) |
| Perihelion | 311.336 Gm (2.081 AU) |
| Semi-major axis | 381.456 Gm (2.550 AU) |
| Eccentricity | 0.184 |
| Orbital period | 1487.227 d (4.07 a) |
| Average orbital speed | 18.49 km/s |
| Mean anomaly | 129.159° |
| Inclination | 16.142° |
| Longitude of ascending node | 311.648° |
| Argument of perihelion | 44.990° |
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Physical characteristics
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| Dimensions | 151.5 km |
| Mass | 3.6×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0423 m/s² |
| Escape velocity | 0.0801 km/s |
| Rotation period | ? d |
| Albedo | 0.176 (geometric) [1] |
| Temperature | ~174 K |
| Spectral type | S |
| Apparent magnitude | 8.74[2] to 12.61 |
| Absolute magnitude (H) | 6.60 |
| Angular diameter | 0.18" to 0.052" |
89 Julia is a large main-belt asteroid. It was discovered by French astronomer Édouard Stephan on August 6, 1866. It was first of his two asteroid discoveries; the other was 91 Aegina. It is believed to be named after Saint Julia of Corsica. A stellar occultation by Julia was observed on December 20, 1985.
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