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247 Eukrate

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247 Eukrate
3D model based on lightcurve data
Discovery
Discovered byRobert Luther
Discovery date14 March 1885
Designations
(247) Eukrate
Pronunciation/jˈkrt/[a]
Named after
Eucrate
A885 EB, 1901 TB
1947 TA, 1960 TC
Main belt
Orbital characteristics[1]
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)
2.7432 AU (410.38 Gm)
Eccentricity0.24257
4.54 yr (1659.5 d)
18.0 km/s
75.9892°
0° 13m 0.948s / day
Inclination24.991°
0.16410°
54.969°
Physical characteristics
130.935±0.505 km[1]
61580 km2[b]
Volume1.361×106 km3[c]
Mass(1.99 ± 0.830/0.62)×1018 kg[2]
Mean density
1.693 ± 0.706/0.527 g/cm3[2][d]
12.093 h (0.5039 d)
0.064±0.012[1]
CP
8.20[1]

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]

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

Notes

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  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.)
  2. ^ Surface area derived from the surface area equivalent diameter d: , where d = 140.0 km.
  3. ^ Volume derived from the volume equivalent diameter d: , where d = 137.5 km.
  4. ^ Assuming a diameter of 130.935 ± 0.505 km.

References

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  1. ^ a b c d "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
  2. ^ 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.
  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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