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268 Adorea

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268 Adorea
Orbital diagram
Discovery
Discovered byA. Borrelly
Discovery date8 June 1887
Designations
(268) Adorea
Pronunciation/əˈdɔːriə/
Named after
adorea liba (spelt cakes)
A887 LA
Main belt (Themis)
AdjectivesAdorean /əˈdɔːriən/
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc39,920 d (109.3 yr)
Aphelion3.515 AU (525.8 Gm)
Perihelion2.668 AU (399.2 Gm)
3.092 AU (462.5 Gm)
Eccentricity0.13689
5.44 yr (1,985.5 d)
302.257°
0° 10m 52.748s / day
Inclination2.44010°
120.914°
69.5742°
Physical characteristics
144.585±0.892 km[1]
139.57±3.31 km[2]
Mass(2.228 ± 0.919/0.718)×1018 kg[2]
Mean density
1.565 ± 0.645/0.505 g/cm3[2]
7.80 h (0.325 d)
0.041±0.007[1]
FC
8.67[1]

268 Adorea is a very large main belt asteroid, about 140 km (87 mi) in width. It was discovered by A. Borrelly on 8 June 1887 in Marseilles. This asteroid is a member of the Themis family[3] and is classified as a primitive carbonaceous F-type/C-type asteroid. It is orbiting the Sun at a distance of 3.09 AU with an orbital eccentricity (ovalness) of 0.14 and a period of 5.44 yr. The orbital plane is tilted at an angle of 2.44° to the plane of the ecliptic.[1]

From February 23 until March 2, 2006, photometric measurements were taken of the asteroid. These were used to produce a light curve showing a rotation period of 7.80±0.02 h with a brightness variation of 0.16±0.03 in magnitude. This result is consistent with some, but not all previous results. Some studies had suggested a longer rotation period of 15.959 h; double the time measured. However, the new data is inconsistent with the longer period.[4]

In May 1979, 268 Adorea was positioned in proximity of the galaxy NGC 4517 and as a bright new light source it was identified as a potential supernova. However, the light was missing from a second photographic plate taken ten days later, and the source was soon identified as the asteroid.[5]

The name refers to adorea liba, the Latin name for spelt cakes produced from meal and salt offered by the Romans as a sacrifice; the name was controversial among astronomers, as all previous asteroids had been named for humans or mythological figures.[6][7]

References

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  1. ^ a b c d e "268 Adorea". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
  2. ^ a b c 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. ^ Florczak, M.; et al. (February 1999). "A spectroscopic study of the THEMIS family". Astronomy and Astrophysics Supplement. 134 (3): 463–471. Bibcode:1999A&AS..134..463F. doi:10.1051/aas:1999150.
  4. ^ Stephens, Robert D. (December 2006). "Asteroid lightcurve photometry from Santana and GMARS observatories - winter and spring 2006". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers. 33 (4): 100–101. Bibcode:2006MPBu...33..100S.
  5. ^ West, R. (September 1979). "The Supernova that was not - 268 Adorea". The Messenger (18): 14. Bibcode:1979Msngr..18...14W.
  6. ^ Schmadel, Lutz (5 August 2003). Dictionary of Minor Planet Names. Springer Science & Business Media. ISBN 9783540002383 – via Google Books.
  7. ^ "268 Adorea". markandrewholmes.com.
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