1541 Estonia
1541 Estonia, provisional designation 1939 CK, is an asteroid from the central regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 12 February 1939, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland. The asteroid was named after the Baltic country of Estonia.
| Discovery | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 12 February 1939 |
| Designations | |
MPC designation | (1541) Estonia |
Named after | Estonia (Baltic country) |
Alternative designations | 1939 CK · 1930 FE 1930 FV · 1950 RG1 1950 SR · 1959 RF1 A916 GE · A923 VE |
Minor planet category | main-belt · (middle) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.57 yr (34,176 days) |
| Aphelion | 2.9610 AU |
| Perihelion | 2.5761 AU |
Semi-major axis | 2.7685 AU |
| Eccentricity | 0.0695 |
Orbital period (sidereal) | 4.61 yr (1,683 days) |
Mean anomaly | 346.22° |
Mean motion | 0° 12m 50.4s / day |
| Inclination | 4.8750° |
Longitude of ascending node | 1.4553° |
| 192.84° | |
| Physical characteristics | |
| Dimensions | 19.53±0.40 km 20.15 km (derived) 20.56±6.71 km 22.000±0.342 km 23.89±1.35 km 24.542±0.096 km |
Synodic rotation period | 10.1±1.0 h |
| 0.0976±0.0129 0.104±0.012 0.12±0.13 0.1314 (derived) 0.140±0.016 | |
| SMASS = Xc · X | |
| 11.20 · 11.30 · 11.4 · 11.56±0.24 | |
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