41 Daphne
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Daphne and satellite as seen by the W.M. Keck II telescope in 2008
|
|
| Discovery[1] | |
|---|---|
| Discovered by | H. Goldschmidt |
| Discovery date | May 22, 1856 |
| Designations | |
| Pronunciation | /ˈdæfniː/ |
|
Named after
|
Daphnē |
| 1949 TG | |
| Main belt | |
| Adjectives | Daphnean /ˈdæfniːən/ |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 526.144 Gm (3.517 AU) |
| Perihelion | 301.220 Gm (2.014 AU) |
| 413.682 Gm (2.765 AU) | |
| Eccentricity | 0.272 |
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|
Average orbital speed
|
17.58 km/s |
| 247.500° | |
| Inclination | 15.765° |
| 178.159° | |
| 46.239° | |
| Known satellites | S/2008 (41) 1 |
| Physical characteristics | |
| Dimensions | 174.0 ± 11.2 km (IRAS)[1] 189 km[2] 213×160 km[3] 239x183x153 km[4] |
| Mass | ~6.8×1018 kg[5] |
|
Mean density
|
~1.95 g/cm³[4] |
| 5.9 hr[1] | |
| Albedo | 0.083[1] |
| Temperature | ~167 K |
|
Spectral type
|
C[1] |
| 7.12[1] | |
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41 Daphne is a large 174 km main-belt asteroid.[1] This dark-surfaced body is probably composed of primitive carbonaceous chondrites. It was discovered by H. Goldschmidt on May 22, 1856, and named after Daphne, the nymph in Greek mythology who was turned into a laurel tree. Incorrect orbital calculations initially resulted in 56 Melete being mistaken for a second sighting of Daphne. Daphne was not sighted again until August 31, 1862.[6]
The orbit of 41 Daphne places it in a 9:22 mean motion resonance with the planet Mars. The computed Lyapunov time for this asteroid is 14,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.[7]
In 1999, Daphne occulted three stars, and on July 2, 1999 produced eleven chords indicating an ellipsoid of 213×160 km.[3] Daphnean lightcurves also suggest that the asteroid is irregular in shape. Daphne was observed by Arecibo radar in April 2008.[8][9] Based upon radar data, the near surface solid density of the asteroid is 2.4+0.7
−0.5 g cm−3.[10]
Satellite
41 Daphne has at least one satellite, designated S/2008 (41) 1.[11] It was identified on March 28, 2008, and has a projected separation of 443 km, an orbital period of approximately 1.1 days,[4] and an estimated diameter of less than 2 km. If these preliminary observations hold up, this binary system has the most extreme size ratio known.[12]
References
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- Orbital simulation from JPL (Java) / Ephemeris
vec:Lista de asteroidi#41 Dafne
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found. (1999-Jul-02 Chords)
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Using the volume of an ellipsoid of 239x183x153km * a density of 1.95 g/cm³ yields a mass (m=d*v) of 6.8E+18 kg
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