11 Parthenope

Large main-belt asteroid January 2020 yes #D6D6D6 11 Parthenope 24px|class=skin-invert|𜻄 or 24px|class=skin-invert|🝺 (historical) 11 Parthenope VLT (2021), deconvolved.pdf Deconvolved VLT-SPHERE image of Parthenope Annibale de Gasparis Naples Obs. 11 May 1850 (11) Parthenope p ɑːr ˈ θ ɛ n ə p i par THEN ə peeNoah Webster (1884) A Practical Dictionary of the English Language Parthenopē Parthenopean (ˌ p ɑːr θ ə n ə ˈ p iː ə n PARTH ə nə PEE ən)Parthenopian (ˌ p ɑːr θ ə ˈ n oʊ p i ə n PARTH ə NOH pee ən)Parthenopean, Parthenopian Main belt 17.0 October 2024 (JD 2460600.5) 2.45337 AU Gm on 2.20942 AU Gm on 2024-Jan-12 2.69732 AU Gm on on 0.09943 3.84 yr (1403.6 d) 4.63153° 125.506° 196.071° 71.503° 19.02 km/s 0.12Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.88 0.05. 156 x 152 x 138 ± 6 km 149 2 km142.887 1.008 km 4.85 0.12 18 kgCalculated from its standard gravitational parameter GM = 0.324 0.008 km3 s2. 2.81 0.13 g/cm3Assuming a diameter of 149 ± 2 km. 0.0578 m/s2 0.0941 km/s 13.7204 h d on on13.72204 0.00001 h 73° S-type asteroid 8.68 to 12.16 6.736.55 17 4 deg 312 2 deg 0.187 (calculated)0.191 0.021 0.178" to 0.057" ~174 K 0.256484 ms / day 63626 days (174.20 yr) 0 1.197 AU Gm on 2.54059 AU Gm on 3.483 11 Parthenope is a large, bright asteroid located in the main asteroid belt. History 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". Two symbols were proposed for Parthenope: a fish and a star (encoded in Unicode 17.0 as U+1CEC4 𜻄 16px|class=skin-invert|alt=11 Parthenope fish symbol) while such symbols were still in use, and later a lyre (encoded in Unicode 17.0 as U+1F77A 🝺 16px|class=skin-invert|alt=11 Parthenope lyre symbol) in lists of symbols. Both are obsolete. Miscellaneous Symbols Supplement 2025 unicode.org The Unicode Consortium https://www.unicode.org/charts/PDF/U1CEC0.pdf September 9, 2025 Alchemical Symbols 2025 unicode.org The Unicode Consortium https://www.unicode.org/charts/PDF/U1F700.pdf September 17, 2025 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. Orbit left|thumb|270px|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. It is classified as a background asteroid, as it does not belong to any known asteroid family. Physical Characteristics 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 6.318 kg with a density of 3.3 g/cm3. 2008 estimates by Baer suggest a mass of 6.1518 kg. The 1997 and 2001 estimates by Viateau and Rapaport were closer to 518 kg with a density of 2.7 g/cm3. 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. See also List of former planets Notes References 30em 2024-11-29 last obs JPL Small-Body Database Browser: 11 Parthenope http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=11 20 December 2024 (11) Parthenope – Proper Elements https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=11 Asteroids Dynamic Site 24 January 2026 1850MNRAS..10..144D De Gasparis Annibale The New Planet Parthenope Monthly Notices of the Royal Astronomical Society 10 144–147 May 1850 10.1093/mnras/10.7.144 free Vernazza P. et al. VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis October 2021 Astronomy & Astrophysics 654 A56 10.1051/0004-6361/202141781 2021A&A...654A..56V 10045/118969 free AstDys (11) Parthenope Ephemerides Department of Mathematics, University of Pisa, Italy https://newton.spacedys.com/astdys/index.php?pc=1.1.3.1&n=11&oc=500&y0=2031&m0=7&d0=29&h0=00&mi0=00&y1=2031&m1=7&d1=29&h1=00&mi1=00&ti=1.0&tiu=days 26 June 2010 https://www.unicode.org/L2/L2023/23207-historical-asteroids.pdf Unicode request for historical asteroid symbols Bala Gavin Jared Miller Kirk 18 September 2023 unicode.org Unicode 26 September 2023 Baer James Steven R. Chesley Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris Celestial Mechanics and Dynamical Astronomy 100 2008 27–42 Springer Science+Business Media B.V. 2007 10.1007/s10569-007-9103-8 2008 2008CeMDA.100...27B free 2008 Recent Asteroid Mass Determinations Personal Website Jim Baer http://home.earthlink.net/~jimbaer1/astmass.txt 6 December 2008 https://web.archive.org/web/20130702212735/http://home.earthlink.net/~jimbaer1/astmass.txt 2 July 2013 dead Frederick Pilcher Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana The Minor Planet Bulletin 38 4 183–185 October 2011 2011MPBu...38..183P . Gradie J. Flynn L. A Search for Satellites and Dust Belts Around Asteroids: Negative Results Abstracts of the Lunar and Planetary Science Conference 19 405–406 March 1988 1988LPI....19..405G . Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links Lightcurve plot of 11 Parthenope, Palmer Divide Observatory, B. D. Warner (2008) IOTA (International Occultation Timing Association) occultation database 2011-Jan-26 Occultation / (2011 Asteroidal Occultation Results for North America) 11 10 Hygiea 11 12 Victoria 000011 Category:Discoveries by Annibale de Gasparis Category:Named minor planets 000011 000011 18500511