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247 Eukrate

From Wikipedia, the free encyclopedia
Main-belt asteroid

247 Eukrate
3D model based onlightcurve data
Discovery
Discovered byRobert Luther
Discovery date14 March 1885
Designations
(247) Eukrate
Pronunciation/juːˈkreɪtiː/[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
4.54yr (1659.5d)
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]
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 largemain-beltasteroid. It is dark and probably a primitivecarbonaceous body. The asteroid was discovered byRobert Luther on March 14, 1885, inDüsseldorf. It was named afterEucrate, aNereid inGreek mythology.

In 2001, the asteroid was detected by radar from theArecibo Observatory at a distance of 1.18 AU. The resulting data yielded an effective diameter of134 ± 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 5chord observation that allows, using Occult (Software), the scaling of theDAMIT 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]
  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 orparticipating institution membership required.)
  2. ^Surface area derived from the surface area equivalent diameterd:πd2{\displaystyle \pi d^{2}}, whered = 140.0 km.
  3. ^Volume derived from the volume equivalent diameterd:π6d3{\displaystyle {\frac {\pi }{6}}d^{3}}, whered = 137.5 km.
  4. ^Assuming a diameter of 130.935 ± 0.505 km.

References

[edit]
  1. ^abcd"247 Eukrate".JPL Small-Body Database.NASA/Jet Propulsion Laboratory. Retrieved12 May 2016.
  2. ^abFienga, 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, retrieved14 April 2015.
  4. ^"PDS Asteroid/Dust Subnode".sbn.psi.edu. Archived fromthe original on 25 April 2018. Retrieved19 May 2018.

External links

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