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(Redirected from Adorea)

268 Adorea
Orbital diagram
Discovery
Discovered by A. 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]
F C
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

  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'nt - 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.

External links

From Wikipedia, the free encyclopedia
(Redirected from Adorea)

268 Adorea
Orbital diagram
Discovery
Discovered by A. 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]
F C
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

  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'nt - 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.

External links


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