289 Nenetta
Nenetta (minor planet designation: 289 Nenetta) is an A-type asteroid with a diameter of 38 km. It was discovered by Auguste Charlois on 10 March 1890 in Nice, France. The asteroid is orbiting the Sun at a distance of 2.87 AU with an eccentricity (ovalness) of 0.204 and an orbital period of 4.87 yr. The orbital plane is inclined at an angle of 6.7° to the plane of the ecliptic.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 10 March 1890 |
| Designations | |
MPC designation | (289) Nenetta |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.69 yr (41526 d) |
| Aphelion | 3.46101 AU (517.760 Gm) |
| Perihelion | 2.28661 AU (342.072 Gm) |
Semi-major axis | 2.87381 AU (429.916 Gm) |
| Eccentricity | 0.20433 |
Orbital period (sidereal) | 4.87 yr (1,779.4 d) |
Mean anomaly | 104.307° |
Mean motion | 0° 12m 8.316s / day |
| Inclination | 6.69535° |
Longitude of ascending node | 182.114° |
| 189.219° | |
| Physical characteristics | |
| Dimensions | 37.586±1.002 km |
Synodic rotation period | 6.902 h (0.2876 d) |
| 0.2438±0.042 | |
| 9.51 | |
Photometric observations taken in 2018 provided a light curve showing a synodic rotation period of 6.916±0.001 h for the asteroid with an amplitude of 0.20±0.02 in magnitude. This result is mostly consistent with previous measurements.
The spectrum of 289 Nenetta reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt.
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