11 Parthenope
 |
|
| Discovery | |
|---|---|
| Discovered by | Annibale de Gasparis |
| Discovery date | 11 May 1850 |
| Designations | |
| Pronunciation | /pɑːrˈθɛnəpiː/ par-THEN-ə-pee |
| none | |
| Main belt | |
| Adjectives | Parthenopean /ˌpɑːrθᵻnəˈpiːən/, Parthenopian /pɑːrθᵻˈnoʊpiən/[1] |
| Orbital characteristics[2] | |
| Epoch 14 July 2004 (JD 2453200.5) | |
| Aphelion | 403.494 Gm (2.697 AU) |
| Perihelion | 330.297 Gm (2.208 AU) |
| 366.896 Gm (2.453 AU) | |
| Eccentricity | 0.100 |
| 1402.891 d (3.84 a) | |
|
Average orbital speed
|
19.02 km/s |
| 333.562° | |
| Inclination | 4.624° |
| 125.637° | |
| 195.436° | |
| Physical characteristics | |
| Dimensions | 153.3 ± 3.1 km (IRAS)[2] |
| Mass | 6.15×1018 kg[3] |
|
Mean density
|
3.28 ± 0.20 g/cm³[3] |
| 0.0578 m/s² | |
| 0.0941 km/s | |
| 13.7204[2] h | |
| Albedo | 0.180 (geometric) [2] |
| Temperature | ~174 K |
|
Spectral type
|
S-type asteroid[2] |
| 8.68[4] to 12.16 | |
| 6.55[2] | |
| 0.178" to 0.057" | |
11 Parthenope[5] 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".[6]
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.[7]
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.[8] The JPL Small-Body Database lists a rotation period of 13.7204 hours.[2]
Contents
Mass
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[9] with a density of 3.3 g/cm³.[9] 2008 estimates by Baer suggest a mass of 6.15×1018.[3] The 1997 and 2001 estimates by Viateau and Rapaport were closer to 5×1018 kg with a density of 2.7 g/cm³.[9]
See also
Notes
- ↑ Lua error in package.lua at line 80: module 'strict' not found. (Subscription or UK public library membership required.), Lua error in package.lua at line 80: module 'strict' not found. (Subscription or UK public library membership required.)
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Stressed on the second syllable, /pɑːrˈθɛnəpiː/ par-THEN-ə-pee.
- ↑ 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.
- ↑ 9.0 9.1 9.2 Lua error in package.lua at line 80: module 'strict' not found.
External links
- JPL Ephemeris
- IOTA (International Occultation Timing Association) occultation database
- 2011-Jan-26 Occultation / (2011 Asteroidal Occultation Results for North America)
- Lua error in package.lua at line 80: module 'strict' not found. (displays Elong from Sun and V mag for 2011)
