444 Gyptis
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444 Gyptis is a main-belt asteroid that was discovered by Jérôme Eugène Coggia on March 31, 1899, in Marseille. 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.[1]
In 2004, Kochetova estimated Gyptis to have a mass of 1.25Template:E kg with a high density of 5.53 g/cm3.[2] In 2012 Carry estimated the mass as Template:Val with a high density of Template:Val.[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.[4] Observations of an occultation on October 14, 2007, produced six chords indicating a cross-section ellipsoid of 179×150 km.[5]
Between 1990 and 2021, 444 Gyptis has been observed to occult 17 stars.
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