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Eukrate (minor planet designation: 247 Eukrate) is a rather large main-belt asteroid. It is dark and probably a primitive carbonaceous body. The asteroid was discovered by Robert Luther on March 14, 1885, in Düsseldorf. It was named after Eucrate, a Nereid in Greek mythology.

247 Eukrate
3D model based on lightcurve data
Discovery
Discovered byRobert Luther
Discovery date14 March 1885
Designations
MPC designation
(247) Eukrate
Pronunciation/juːˈkreɪtiː/[1]
Named after
Eucrate
Alternative designations
A885 EB, 1901 TB
1947 TA, 1960 TC
Minor planet category
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.09 yr (47880 d)
Aphelion3.4086 AU (509.92 Gm)
Perihelion2.0778 AU (310.83 Gm)
Semi-major axis
2.7432 AU (410.38 Gm)
Eccentricity0.24257
Orbital period (sidereal)
4.54 yr (1659.5 d)
Average orbital speed
18.0 km/s
Mean anomaly
75.9892°
Mean motion
0° 13m 0.948s / day
Inclination24.991°
Longitude of ascending node
0.16410°
Argument of perihelion
54.969°
Physical characteristics
Dimensions134.43±2.5 km
Synodic rotation period
12.093 h (0.5039 d)
Geometric albedo
0.0595±0.002
Spectral type
CP
Absolute magnitude (H)
8.04

    In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.18 AU. The resulting data yielded an effective diameter of 134 ± 15 km.[3]

    An Occult (Software) plot of 5 Occultation chords (and a miss) with DAMIT Inversion model at event time.
    An Occult (Software) plot of 5 Occultation chords (and a miss) with DAMIT Inversion model at event time.

    There have been 9 occultation observations of this asteroid since 2004.[4] The latest of 2018 May 12 was a 5 chord observation that allows, using Occult (Software), the scaling of the DAMIT model 1207, to yield a Mean volume-equivalent diameter of 137.5km and a Mean surface-equivalent diameter of 140.0 km.


    References


    1. A rare case of a long alpha in Greek, eukrātē, so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    2. "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
    3. Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 14 April 2015.
    4. "PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.



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    На других языках

    [de] (247) Eukrate

    (247) Eukrate ist ein Asteroid des Asteroiden-Hauptgürtels, der am 14. März 1885 von Karl Theodor Robert Luther an der Sternwarte Düsseldorf entdeckt wurde.
    - [en] 247 Eukrate

    [es] (247) Eukrate

    (247) Eukrate es un asteroide perteneciente al cinturón de asteroides descubierto por Karl Theodor Robert Luther el 14 de marzo de 1885 desde el observatorio de Düsseldorf-Bilk, Alemania. Está nombrado por Eucrante, una diosecilla de la mitología griega.[2]

    [ru] (247) Эвкрата

    (247) Эвкрата (др.-греч. Ευκράτη) — довольно крупный астероид главного пояса. Он был открыт 14 марта 1885 года немецким астрономом Карлом Лютером в обсерватории города Дюссельдорф и назван в честь одной из нереид древнегреческой мифологии[1].


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