 | |
| Discovery | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | 23 August 1872 |
| Designations | |
| (124) Alkeste | |
| Pronunciation | /ælˈkɛstiː/[1] |
Named after | Alcestis |
| A872 QA | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 143.65 yr (52468 d) |
| Aphelion | 2.8288 AU (423.18 Gm) |
| Perihelion | 2.43166 AU (363.771 Gm) |
| 2.63022 AU (393.475 Gm) | |
| Eccentricity | 0.075491 |
| 4.27yr (1558.1d) | |
Averageorbital speed | 18.34 km/s |
| 343.779° | |
| 0° 13m 51.816s / day | |
| Inclination | 2.9573° |
| 187.991° | |
| 61.413° | |
| Earth MOID | 1.41927 AU (212.320 Gm) |
| Jupiter MOID | 2.17851 AU (325.900 Gm) |
| TJupiter | 3.394 |
| Physical characteristics | |
| Dimensions | 88.65±1.65 km 76.36±1.7 km |
| Mass | 4.7×1017 kg |
Equatorialsurface gravity | 0.0214 m/s² |
Equatorialescape velocity | 0.0404 km/s |
| 9.921 h (0.4134 d) | |
| 0.1728±0.008 | |
| Temperature | ~172K |
| S | |
| 8.11,[2] 8.09[3] | |
124 Alkeste is amain-beltasteroid, and it is anS-type (siliceous) in composition.C.H.F. Peters discovered the asteroid on August 23, 1872, from the observatory atHamilton College,New York State. The name was chosen by Adelinde Weiss, wife of the astronomerEdmund Weiss, and refers toAlcestis, a woman inGreek mythology.[4]
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A 20chordstellaroccultation by Alkeste was observed when the asteroid passed in front of the thirdmagnitude starBeta Virginis on June 24, 2003. The event was visible fromAustralia andNew Zealand.[5]
The asteroid has been observed in 3 more stellar occultation events.[6]
Photometric observations of this asteroid in 2016 producedlightcurves indicating arotation period of 9.9 hours with anamplitude variation of 0.18 in magnitude. This result matched previous determinations of the spin rate. The lightcurve was found to vary over the observation period as the viewing angle changed, suggesting the shadowing of topographic features.[7]
_mathilde.jpg) | This article about an S-type asteroid native to theasteroid belt is astub. You can help Wikipedia byexpanding it. |
