247 Eukrate

247 Eukrate
	3D model based on lightcurve data
Discovery
Discovered by	Robert Luther
Discovery date	14 March 1885
Designations
MPC designation	(247) Eukrate
Pronunciation	/juːˈkreɪtiː/
Named after	Eucrate
Alternative designations	A885 EB, 1901 TB; 1947 TA, 1960 TC
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	131.09 yr (47880 d)
Aphelion	3.4086 AU (509.92 Gm)
Perihelion	2.0778 AU (310.83 Gm)
Semi-major axis	2.7432 AU (410.38 Gm)
Eccentricity	0.24257
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
Inclination	24.991°
Longitude of ascending node	0.16410°
Argument of perihelion	54.969°
Physical characteristics
Mean diameter	130.935±0.505 km
Surface area	61580 km2
Volume	1.361×106 km3
Mass	(1.99 ± 0.830/0.62)×1018 kg
Mean density	1.693 ± 0.706/0.527 g/cm3
Synodic rotation period	12.093 h (0.5039 d)
Geometric albedo	0.064±0.012
Spectral type	CP
Absolute magnitude (H)	8.20

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.

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]

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 137.5 km and a mean surface-equivalent diameter of 140.0 km.

Notes[edit]

^ A rare case of a long alpha in Greek, eukrātē,[1] so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Surface area derived from the surface area equivalent diameter d: $\pi d^{2}$ , where d = 140.0 km.
^ Volume derived from the volume equivalent diameter d: ${\frac {\pi }{6}}d^{3}$ , where d = 137.5 km.
^ Assuming a diameter of 130.935 ± 0.505 km.

References[edit]

^ ^a ^b ^c ^d "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ ^a ^b Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
^ 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.
^ "PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.

External links[edit]

The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
Asteroid Lightcurve Data File
247 Eukrate at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
247 Eukrate at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[1] A rare case of a long alpha in Greek, eukrātē,[1] so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[3] Surface area derived from the surface area equivalent diameter d: $\pi d^{2}$ , where d = 140.0 km.

[4] Volume derived from the volume equivalent diameter d: ${\frac {\pi }{6}}d^{3}$ , where d = 137.5 km.

[6] Assuming a diameter of 130.935 ± 0.505 km.

[jpldata-2] "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[FiengaEtAl2020-5] Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.

[icarus186_1_126-7] 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.

[8] "PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.

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