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.
| lightcurve data | |
| Discovery | |
|---|---|
| Discovered by | Robert Luther |
| Discovery date | 14 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 arc | 131.09 yr (47880 d) |
| Aphelion | 3.4086 AU (509.92 Gm) |
| Perihelion | 2.0778 AU (310.83 Gm) |
| 2.7432 AU (410.38 Gm) | |
| Eccentricity | 0.24257 |
| 4.54 yr (1659.5 d) | |
Average orbital speed | 18.0 km/s |
| 75.9892° | |
| 0° 13m 0.948s / day | |
| Inclination | 24.991° |
| 0.16410° | |
| 54.969° | |
| Physical characteristics | |
| 130.935±0.505 km[1] | |
| 61580 km2[b] | |
| Volume | 1.361×106 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] | |
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.
- ^ 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: , where d = 140.0 km.
- ^ Volume derived from the volume equivalent diameter d: , where d = 137.5 km.
- ^ Assuming a diameter of 130.935 ± 0.505 km.
- ^ 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.
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 247 Eukrate at AstDyS-2, Asteroids—Dynamic Site
- 247 Eukrate at the JPL Small-Body Database
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