| Minorplanet: | yes |
| Background: |
|
| 444 Gyptis | |
| Discovered: | 31 March 1899 |
| Mpc Name: | (444) Gyptis |
| Alt Names: | 1899 EL |
| Adjective: | Gyptidian |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 2.77005AU |
| Perihelion: | 2.28337AU |
| Aphelion: | 3.25674abbr=onNaNabbr=on |
| Eccentricity: | 0.17569 |
| Period: | 4.61 yr (1684.0 d) |
| Inclination: | 10.2775° |
| Asc Node: | 195.716° |
| Arg Peri: | 154.984° |
| Dimensions: | 179×150 km [1] |
| Mass: | 1.25 kg[2] |
| Density: | 5.53±1.46 g/cm3 |
| Rotation: | 6.214abbr=onNaNabbr=on |
| Abs Magnitude: | 7.83 |
| Mean Motion: | / day |
| Observation Arc: | 116.54 yr (42568 d) |
| Uncertainty: | 0 |
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.
In 2004, Kochetova estimated Gyptis to have a mass of 1.25 kg with a high density of 5.53 g/cm3.[2] 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. Observations of an occultation on October 14, 2007, produced six chords indicating a cross-section ellipsoid of 179×150 km.[3]
Between 1990 and 2021, 444 Gyptis has been observed to occult 17 stars.
