1313 Berna
| Discovery | |
|---|---|
| Discovered by | Sylvain Julien Victor Arend |
| Discovery date | August 24, 1933 |
| Designations | |
| Named after | Bern |
| Alternative names | A911 OA; 1926 EA; 1933 QG |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 479.945 Gm (3.208 AU) |
| Perihelion | 315.311 Gm (2.108 AU) |
| Semi-major axis | 397.628 Gm (2.658 AU) |
| Eccentricity | 0.207 |
| Orbital period | 1582.799 d(4.33 a) |
| Average orbital speed | 18.07 km/s |
| Mean anomaly | 206.388° |
| Inclination | 12.523° |
| Longitude of ascending node | 298.466° |
| Argument of perihelion | 99.333° |
| Physical characteristics | |
| Dimensions | 13.93 ± 0.64[1] km |
| Mass | (2.25 ± 2.00) × 1015[1] kg |
| Mean density | 1.21 ± 0.14[1] g/cm3 |
| Equatorial surface gravity | 0.0017? m/s² |
| Escape velocity | 0.0043? km/s |
| Rotation period | 1.061±0.005 d |
| Albedo | 0.1? |
| Temperature | ~171 K |
| Spectral type | ? |
| Absolute magnitude (H) | 11.8 |
1313 Berna is an asteroid orbiting the Sun. It is named after the city of Berne, in Switzerland.
A satellite, designated S/2004 (1313) 1, was identified based on lightcurve observations 6–12 February 2004 by René Roy, Stefano Sposetti, Nicolas Waelchli, Donald P. Pray, Nathanaël Berger, Christophe Demeautis, Daniel Matter, Russell I. Durkee, Alain Klotz, Donn R. Starkey, Vincent Cotrez, and Raoul Behrend. This was announced on 12 February 2004 (although the IAUC announcement only came on 23 February 2004). The moon, estimated to be 11 km across, orbits about 35 km from its primary in 1.061±0.005 d.
References
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
External links
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