774 Armor

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774 Armor
Discovery
Discovered byC. le Morvan
Discovery siteParis
Discovery date19 December 1913
Designations
MPC designation
(774) Armor
1913 TW
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc107.33 yr (39203 d)
Aphelion3.5625 AU (532.94 Gm)
Perihelion2.5318 AU (378.75 Gm)
3.0472 AU (455.85 Gm)
Eccentricity0.16914
5.32 yr (1942.9 d)
240.634°
0° 11m 7.044s / day
Inclination5.5589°
250.253°
28.478°
Earth MOID1.51688 AU (226.922 Gm)
Jupiter MOID1.56651 AU (234.347 Gm)
TJupiter3.209
Physical characteristics
Mean radius
25.185±0.95 km
Synodic rotation period
25.107 h (1.0461 d)
0.2529±0.020
Absolute magnitude (H)
8.8

774 Armor is a minor planet orbiting the Sun in the main belt. It was discovered on December 13, 1913 in Paris by French astronomer Charles le Morvan and was named after the Celtic region of Armorica.[2] The asteroid is orbiting at a distance of 3.05 AU with a period of 5.32 yr and an eccentricity of 0.169. The orbital plane is inclined by an angle of 5.56° to the plane of the ecliptic.[1]

In the SMASS-I taxonomy, this is classified as an S-type asteroid.[3] It spans a girth of approximately 50 km.[1] The rotation of this asteroid is commensurate with the length of an Earth day, requiring measurements from more than one latitude for full coverage. Photometric observations from the USA and Australia in 2012 provided an estimated rotation period of 25.107±0.005 h with a brightness variation of 0.16±0.02 in magnitude. This is consistent with the results of an earlier study in 2006.[4]

References[]

  1. ^ a b c "774 Armor (1913 TW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
  2. ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer Berlin Heidelberg, p. 72, ISBN 9783642297182.
  3. ^ Burbine, Thomas H.; Binzel, Richard P. (October 2002), "Small Main-Belt Asteroid Spectroscopic Survey in the Near-Infrared", Icarus, 159 (2): 468–499, Bibcode:2002Icar..159..468B, doi:10.1006/icar.2002.6902.
  4. ^ Oey, Julian; et al. (April 2013), "Lightcurve Analsyis of 774 Armor and 3161 Beadell", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 40 (2): 64, Bibcode:2013MPBu...40...64O.

External links[]

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