444 Gyptis
| Discovery | |
|---|---|
Synodic rotation period | 6.214 h (0.2589 d)[1] |
| 0.0490±0.007[1] | |
| C[1] | |
| 7.83[1] | |
Gyptis,
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]
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
- ^ a b c d e f "JPL Small-Body Database Browser: 444 Gyptis (1899 EL)" (2008-11-01 last obs). Retrieved 10 May 2016.
- ^ a b "2007 European Asteroidal Occultation Results". euraster.net (a website for Asteroidal Occultation Observers in Europe). 14 October 2007. Retrieved 1 December 2008. (Chords)
- ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 27 November 2008.
- .
- PMID 19081813.
External links
- 444 Gyptis at AstDyS-2, Asteroids—Dynamic Site
- 444 Gyptis at the JPL Small-Body Database
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