673 Edda
673 Edda is a minor planet orbiting the Sun. It was discovered 20 September 1908 by the American astronomer Joel Hastings Metcalf, and was named for the Norse Edda literary works. The name may also have been inspired by the asteroid's provisional designation 1908 EA. This asteroid is orbiting at a distance of 2.81 AU with a period of 4.72 yr and an eccentricity of 0.012. The orbit is close to a 5:2 mean motion resonance with Jupiter, which is located at 2.824 AU.
Modelled shape of Edda from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 20 September 1908 |
| Designations | |
MPC designation | (673) Edda |
| Pronunciation | /ˈɛdə/ |
Alternative designations | 1908 EA |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 107.57 yr (39290 d) |
| Aphelion | 2.8471 AU (425.92 Gm) |
| Perihelion | 2.7821 AU (416.20 Gm) |
Semi-major axis | 2.8146 AU (421.06 Gm) |
| Eccentricity | 0.011542 |
Orbital period (sidereal) | 4.72 yr (1,724.7 d) 4.72 yr (1724.7 d) |
Mean anomaly | 199.04° |
Mean motion | 0° 12m 31.428s / day |
| Inclination | 2.8770° |
Longitude of ascending node | 226.723° |
| 236.303° | |
| Physical characteristics | |
Mean radius | 18.765±0.5 km |
Synodic rotation period | 22.340 h (0.9308 d) |
| 0.1044±0.006 | |
| 10.20 | |
The long rotation period and low brightness amplitude of this asteroid make it more challenging for measurement of the rotation period. An extensive photometry campaign in 2015 provided a period of 22.340±0.004 h. The unusual light curve suggests that the asteroid shape is very asymmetric. It is a stony S-type asteroid that spans a mean diameter of 38+6
−2 km.