Global Information11 Parthenope information
 | |
| Discovery | |
|---|---|
| Discovered by | Annibale de Gasparis |
| Discovery site | Naples Obs. |
| Discovery date | 11 May 1850 |
| Designations | |
MPC designation | (11) Parthenope |
| Pronunciation | /pɑːrˈθɛnəpi/ parth-EN-ə-pee[1] |
Named after | Parthenopē |
Minor planet category | Main belt |
| Adjectives | Parthenopean (/ˌpɑːrθənəˈpiːən/ PARTH-ə-nə-PEE-ən) Parthenopian (/ˌpɑːrθəˈnoʊpiən/ PARTH-ə-NOH-pee-ən)[2] |
| Symbol |  or  (historical) |
| Orbital characteristics[3] | |
| 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) |
Semi-major axis | 2.45254 AU (366.895 Gm) |
| Eccentricity | 0.10024 |
Orbital period (sidereal) | 3.84 yr (1402.9 d) |
Average orbital speed | 19.02 km/s |
Mean anomaly | 330.520° |
Mean motion | 0° 15m 23.81s / day |
| Inclination | 4.62985° |
Longitude of ascending node | 125.567° |
Time of perihelion | 2024-Jan-11 |
Argument of perihelion | 196.005° |
| Earth MOID | 1.19227 AU (178.361 Gm) |
| Jupiter MOID | 2.54174 AU (380.239 Gm) |
| TJupiter | 3.483 |
| Physical characteristics | |
Mean diameter | 149±2 km[4] 142.887±1.008 km[3] |
| Flattening | 0.12[a] |
| Mass | (5.5±0.4)×1018 kg[4] 6.15×1018 kg[5] |
Mean density | 3.2±0.27 g/cm3[4] 3.28±0.20 g/cm3[5] |
Equatorial surface gravity | 0.0578 m/s2 |
Equatorial escape velocity | 0.0941 km/s |
Synodic rotation period | 13.7204 h (0.57168 d)[3] |
Geometric albedo | 0.187 (calculated)[4] 0.191±0.021[3] |
| Temperature | ~174 K |
Spectral type | S-type asteroid[3] |
Apparent magnitude | 8.68[6] to 12.16 |
Absolute magnitude (H) | 6.73[3] |
Angular diameter | 0.178" to 0.057" |
Parthenope (/pɑːrˈθɛnəpi/ parth-EN-ə-pee; minor planet designation: 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".[7] Two symbols were proposed for Parthenope: a fish and a star (in the pipeline for Unicode 17.0 as U+1CEC4 
) while such symbols were still in use, and later a lyre (in the pipeline for Unicode 17.0 as U+1F77A 
) in lists of symbols. Both are obsolete.[8][9]
There have been two observed Parthenopian occultations, on 13 February 1987, and 28 April 2006.
On 6 August 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.[10]
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.[11] The JPL Small-Body Database lists a rotation period of 13.7204 hours.[3]
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ "Parthenopean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.), "Parthenopian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c d e f g "JPL Small-Body Database Browser: 11 Parthenope" (2008-08-04 last obs). Retrieved 8 April 2016.
- ^ a b c d e P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
- ^ a b Cite error: The named reference
Baerwas invoked but never defined (see the help page). - ^ "AstDys (11) Parthenope Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 26 June 2010.
- ^ De Gasparis, Annibale (May 1850). "The New Planet Parthenope". Monthly Notices of the Royal Astronomical Society. 10: 144–147. Bibcode:1850MNRAS..10..145.. doi:10.1093/mnras/10.7.144.
- ^ Bala, Gavin Jared; Miller, Kirk (18 September 2023). "Unicode request for historical asteroid symbols" (PDF). unicode.org. Unicode. Retrieved 26 September 2023.
- ^ Unicode. "Proposed New Characters: The Pipeline". unicode.org. The Unicode Consortium. Retrieved 6 November 2023.
- ^ Cite error: The named reference
Gradie1988was invoked but never defined (see the help page). - ^ Cite error: The named reference
Pilcher2011was invoked but never defined (see the help page).
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