Jump to content
Wikipedia The Free Encyclopedia

11 Parthenope

From Wikipedia, the free encyclopedia
Large main-belt asteroid

11 Parthenope
Deconvolved VLT-SPHERE image of Parthenope
Discovery
Discoveredby Annibale de Gasparis
Discoverysite Naples Obs.
Discoverydate11 May 1850
Designations
Pronunciation/pɑːrˈθɛnəpi/ par-THEN-ə-pee [1]
Named after
Parthenopē
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 17.0 October 2024 (JD 2460600.5)
Uncertainty parameter 0
Observation arc 63626 days (174.20 yr)
Aphelion 2.69732AU (403.513Gm)
Perihelion 2.20942AU (330.525Gm)
2.45337AU (367.019Gm)
Eccentricity 0.09943
3.84 yr (1403.6 d)
Average orbital speed
19.02km/s
71.503°
0° 15m 23.342s / day
Inclination 4.63153°
125.506°
2024-Jan-12
196.071°
EarthMOID 1.197AU (179.1Gm)
JupiterMOID 2.54059AU (380.067Gm)
TJupiter 3.483
Physical characteristics
Dimensions 156 ×ばつ 152 ×ばつ 138 ± 6 km[4]
149±2km[4]
142.887±1.008km[3]
Flattening 0.12[a]
Mass (5.5±0.4)×ばつ1018kg[4]
6.15×ばつ1018kg[5]
Mean density
3.20±0.27g/cm3[4]
3.28±0.20g/cm3[5]
Equatorial surfacegravity
0.0578 m/s2
Equatorial escape velocity
0.0941 km/s
13.7204h (0.57168d)[3]
13.72204±0.00001h[4]
73°[4]
312°±2°[4]
17°±4°[4]
0.187 (calculated)[4]
0.191±0.021[3]
Temperature ~174 K
S-type asteroid [3]
8.68[6] to 12.16
6.73[3]
6.55[4]
0.178" to 0.057"

11 Parthenope is a large, bright asteroid located in the main asteroid belt.

History

[edit ]

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 (encoded in Unicode 17.0 as U+1CEC4 𜻄 11 Parthenope fish symbol ) while such symbols were still in use, and later a lyre (encoded in Unicode 17.0 as U+1F77A 🝺 11 Parthenope lyre symbol ) in lists of symbols. Both are obsolete.[8] [9] [10]

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.[11]

Orbit

[edit ]
An orbital diagram of 11 Parthenope, with the orbits of the inner planets and Jupiter shown.

Parthenope orbits the Sun at an average distance (its semi-major axis) of 2.454 astronomical units (AU), with an orbital period of 3.845 years. Its distance from the Sun varies from 2.209 AU at its perihelion to 2.699 AU at its aphelion, indicated by its orbital eccentricity of 0.0998. Its orbit is inclined by 4.633° with respect to the ecliptic plane.[3] It is classified as a background asteroid, as it does not belong to any known asteroid family.[12]

Physical Characteristics

[edit ]

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×ばつ1018 kg with a density of 3.3 g/cm3.[13] 2008 estimates by Baer suggest a mass of 6.15×ばつ1018 kg.[5] The 1997 and 2001 estimates by Viateau and Rapaport were closer to 5×ばつ1018 kg with a density of 2.7 g/cm3.[13]

Based upon a light curve that was generated from photometric observations of Parthenope 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.[14]

See also

[edit ]

Notes

[edit ]
  1. ↑ Flattening derived from the maximum aspect ratio (c/a): f = 1 − c a {\displaystyle f=1-{\frac {c}{a}}} {\displaystyle f=1-{\frac {c}{a}}}, where (c/a) = 0.88±0.05.[4]

References

[edit ]
  1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ↑ "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.)
  3. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 11 Parthenope" (2024年11月29日 last obs). Retrieved 20 December 2024.
  4. 1 2 3 4 5 6 7 8 9 10 11 Vernazza, P.; et al. (October 2021). "VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis". Astronomy & Astrophysics. 654: A56. Bibcode:2021A&A...654A..56V. doi:10.1051/0004-6361/202141781. hdl:10045/118969 .
  5. 1 2 3 Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 6 December 2008.
  6. ↑ "AstDys (11) Parthenope Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 26 June 2010.
  7. ↑ De Gasparis, Annibale (May 1850). "The New Planet Parthenope". Monthly Notices of the Royal Astronomical Society . 10: 144–147. Bibcode:1850MNRAS..10..144D. doi:10.1093/mnras/10.7.144 .
  8. ↑ Bala, Gavin Jared; Miller, Kirk (18 September 2023). "Unicode request for historical asteroid symbols" (PDF). unicode.org. Unicode. Retrieved 26 September 2023.
  9. ↑ "Miscellaneous Symbols Supplement" (PDF). unicode.org. The Unicode Consortium. 2025. Retrieved 9 September 2025.
  10. ↑ "Alchemical Symbols" (PDF). unicode.org. The Unicode Consortium. 2025. Retrieved 17 September 2025.
  11. ↑ Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference, vol. 19, pp. 405–406, Bibcode:1988LPI....19..405G.
  12. ↑ "(11) Parthenope – Proper Elements". Asteroids Dynamic Site. Retrieved 24 January 2026.
  13. 1 2 Baer, James; Steven R. Chesley (2008). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris". Celestial Mechanics and Dynamical Astronomy. 100 (2008). Springer Science+Business Media B.V. 2007: 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8 .
  14. ↑ Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", The Minor Planet Bulletin, vol. 38, no. 4, pp. 183–185, Bibcode:2011MPBu...38..183P.
[edit ]

AltStyle によって変換されたページ (->オリジナル) /