53 Kalypso
| Discovery[1] | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | April 4, 1858 |
| Designations | |
|
Named after
|
Calypso |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 471.807 Gm (3.154 AU) |
| Perihelion | 311.998 Gm (2.086 AU) |
| 391.903 Gm (2.620 AU) | |
| Eccentricity | 0.204 |
| 1548.736 d (4.24 a) | |
|
Average orbital speed
|
18.21 km/s |
| 98.113° | |
| Inclination | 5.153° |
| 143.813° | |
| 312.330° | |
| Physical characteristics | |
| Dimensions | 115.4 km[2] |
| Mass | (5.63 ± 5.00) × 1018[3] kg |
|
Mean density
|
8.28 ± 7.54[3] g/cm3 |
| 0.0323 m/s² | |
| 0.0610 km/s | |
| 9.036[4] h | |
| Albedo | 0.040[2][5] |
| Temperature | ~172 K |
| 8.81[2] | |
53 Kalypso /kəˈlɪpsoʊ/ is a large and very dark main belt asteroid that was discovered by German astronomer Robert Luther on April 4, 1858 at Düsseldorf.[1] It is named after Calypso, a sea nymph in Greek mythology, a name it shares with Calypso, a moon of Saturn.
The orbit of 53 Kalypso places it in a mean motion resonance with the planets Jupiter and Saturn. The computed Lyapunov time for this asteroid is 19,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.[6]
Photometric observations of this asteroid during 2005–06 gave a light curve with a period of 18.075 ± 0.005 hours and a brightness variation of 0.14 in magnitude.[7] In 2009, a photometric study from a different viewing angle was performed at the Organ Mesa Observatory in Las Cruces, New Mexico, yielding a rotation period of 9.036 ± 0.001 with a brightness variation of 0.14 ± 0.02 magnitude. This is exactly half of the 2005-06 result. The author of the earlier study used additional data observation that favored the 9.036 hour period. The discrepancy was deemed a consequence of viewing the asteroid from different longitudes.[4]
Kalypso has been studied by radar.[8]
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Asteroid Data Sets
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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