astro.wikisort.org - Asteroid
Gyptis, minor planet designation: 444 Gyptis, is a main-belt asteroid that was discovered by J. Coggia on March 31, 1899, in Marseilles. It is classified as a C-type asteroid and is probably composed of carbonaceous material. The spectra of the asteroid displays evidence of aqueous alteration.[4]
| Discovery | |
|---|---|
| Discovered by | J. Coggia |
| Discovery date | 31 March 1899 |
| Designations | |
MPC designation | (444) Gyptis |
| Pronunciation | /ˈdʒɪptɪs/ |
Named after | Gyptis |
Alternative designations | 1899 EL |
Minor planet category | Main belt |
| Adjectives | Gyptidian |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 116.54 yr (42568 d) |
| Aphelion | 3.25674 AU (487.201 Gm) |
| Perihelion | 2.28337 AU (341.587 Gm) |
Semi-major axis | 2.77005 AU (414.394 Gm) |
| Eccentricity | 0.17569 |
Orbital period (sidereal) | 4.61 yr (1684.0 d) |
Mean anomaly | 11.8852° |
Mean motion | 0° 12m 49.615s / day |
| Inclination | 10.2775° |
Longitude of ascending node | 195.716° |
Argument of perihelion | 154.984° |
| Physical characteristics | |
| Dimensions | 179×150 km[2] 163.08±10.0 km[1] |
| Mass | 1.25×1019 kg[3] |
Mean density | 5.53±1.46 g/cm3[3] |
Synodic rotation period | 6.214 h (0.2589 d)[1] |
Geometric albedo | 0.0490±0.007[1] |
Spectral type | C[1] |
Absolute magnitude (H) | 7.83[1] |
In 2004, Kochetova estimated Gyptis to have a mass of 1.25×1019 kg with a high density of 5.53 g/cm3.[3] The adaptive optics instrument at the W. M. Keck Observatory showed an object with a diameter of 129 km, which is much smaller than the estimate of 160 km from the IRAS observatory measurements, indicating an irregular shape. The size ratio between the major and minor axes is estimated at 1.40.[5] Observations of an occultation on October 14, 2007, produced six chords indicating a cross-section ellipsoid of 179×150 km.[2]
Between 1990 and 2021, 444 Gyptis has been observed to occult 17 stars.
References
- "JPL Small-Body Database Browser: 444 Gyptis (1899 EL)" (2008-11-01 last obs). Retrieved 10 May 2016.
- "2007 European Asteroidal Occultation Results". euraster.net (a website for Asteroidal Occultation Observers in Europe). 14 October 2007. Retrieved 1 December 2008. (Chords)
- Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 27 November 2008.
- Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.
- Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.
External links
- 444 Gyptis at AstDyS-2, Asteroids—Dynamic Site
- 444 Gyptis at the JPL Small-Body Database
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На других языках
[de] (444) Gyptis
(444) Gyptis ist ein Asteroid des Hauptgürtels, der am 31. März 1899 von Jérôme-Eugène Coggia in Marseille entdeckt wurde.- [en] 444 Gyptis
[es] (444) Gyptis
(444) Gyptis es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Jérôme Eugène Coggia el 31 de marzo de 1899 desde el observatorio de Marsella, Francia.[ru] (444) Гиптида
(444) Гиптида (лиг. Gyptis) — крупный астероид главного пояса, который был открыт 31 марта 1899 года французским астрономом Жеромом Коджа в Марсельской обсерватории и назван в честь лигурийской принцессы Гиптиды (Жиптис) — жены Протиса, основателя Массалии (Марселя)[3].Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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