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268 Adorea

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Main-belt asteroid "Adorea" redirects here. For the insect genus, see Adorea (beetle).

268 Adorea
Orbital diagram
Discovery
Discovered byA. Borrelly
Discovery date8 June 1887
Designations
MPC designation(268) Adorea
Pronunciation/əˈdɔːriə/
Named afteradorea liba (spelt cakes)
Alternative designationsA887 LA
Minor planet categoryMain belt (Themis)
AdjectivesAdorean /əˈdɔːriən/
Orbital characteristics
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)
Semi-major axis3.092 AU (462.5 Gm)
Eccentricity0.13689
Orbital period (sidereal)5.44 yr (1,985.5 d)
Mean anomaly302.257°
Mean motion0° 10 52.748 / day
Inclination2.44010°
Longitude of ascending node120.914°
Argument of perihelion69.5742°
Physical characteristics
Mean diameter144.585±0.892 km
139.57±3.31 km
Mass(2.228 ± 0.919/0.718)×10 kg
Mean density1.565 ± 0.645/0.505 g/cm
Synodic rotation period7.80 h (0.325 d)
Geometric albedo0.041±0.007
Spectral typeFC
Absolute magnitude (H)8.67

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 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.

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.

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.

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.

References

  1. ^ "268 Adorea". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
  2. ^ 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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