11 Parthenope
 |
|
| Discovery | |
|---|---|
| Discovered by | Annibale de Gasparis |
| Discovery date | 11 May 1850 |
| Designations | |
| MPC designation | (11) Parthenope |
| Pronunciation | /pɑːrˈθɛnəpiː/ par-THEN-ə-pee |
| none | |
| Main belt | |
| Adjectives | Parthenopean /ˌpɑːrθᵻnəˈpiːən/, Parthenopian /pɑːrθᵻˈnoʊpiən/ |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 60281 days (165.04 yr) |
| Aphelion | 2.69837 AU (403.670 Gm) |
| Perihelion | 2.20671 AU (330.119 Gm) |
| 2.45254 AU (366.895 Gm) | |
| Eccentricity | 0.10024 |
| 3.84 yr (1402.9 d) | |
|
Average orbital speed
|
19.02 km/s |
| 330.520° | |
| 0° 15m 23.81s / day | |
| Inclination | 4.62985° |
| 125.567° | |
| 196.005° | |
| Earth MOID | 1.19227 AU (178.361 Gm) |
| Jupiter MOID | 2.54174 AU (380.239 Gm) |
| Jupiter Tisserand parameter | 3.483 |
| Physical characteristics | |
| Dimensions | 153.3 ± 3.1 km (IRAS) |
|
Mean radius
|
76.665 ± 1.55 km |
| Mass | 6.15×1018 kg |
|
Mean density
|
3.28 ± 0.20 g/cm³ |
|
Equatorial surface gravity
|
0.0578 m/s² |
|
Equatorial escape velocity
|
0.0941 km/s |
| 13.7204 h (0.57168 d) | |
| 0.1803 ± 0.007 | |
| Temperature | ~174 K |
| S-type asteroid | |
| 8.68 to 12.16 | |
| 6.55 | |
| 0.178" to 0.057" | |
11 Parthenope is a large, bright main-belt asteroid.
Parthenope was discovered by Annibale de Gasparis on 11 May 1850, the second of his nine asteroid discoveries. It was named after Parthenopē, one of the Sirens in Greek mythology, said to have founded the city of Naples. De Gasparis "used his utmost endeavours to realise a 'Parthenope' in the heavens, such being the name suggested by Sir John Herschel on the occasion of the discovery of Hygiea in 1849".
There have been two observed Parthenopian occultations, on 13 February 1987, and 28 April 2006.
On August 6, 2008, during a perihelic opposition, Parthenope had an apparent magnitude of 8.8.
In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.
Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 13.722 ± 0.001 hours and varies in brightness by 0.10 ± 0.0s in magnitude. The light curve displays three maxima and minima per cycle. The JPL Small-Body Database lists a rotation period of 13.7204 hours.
In 2007, Baer and Chesley calculated a higher mass and density for Parthenope based on perturbations by the 90 km asteroid 17 Thetis. Baer and Chesley calculated a mass of 6.3×1018 kg with a density of 3.3 g/cm³. 2008 estimates by Baer suggest a mass of 6.15×1018. The 1997 and 2001 estimates by Viateau and Rapaport were closer to 5×1018 kg with a density of 2.7 g/cm³.
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