774 Armor is a minor planet (specifically an asteroid) orbiting in the main belt. It was discovered on 13 December 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]
| Discovery | |
|---|---|
| Discovered by | C. le Morvan |
| Discovery site | Paris |
| Discovery date | 19 December 1913 |
| Designations | |
| (774) Armor | |
| 1913 TW | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 107.33 yr (39203 d) |
| Aphelion | 3.5625 AU (532.94 Gm) |
| Perihelion | 2.5318 AU (378.75 Gm) |
| 3.0472 AU (455.85 Gm) | |
| Eccentricity | 0.16914 |
| 5.32 yr (1942.9 d) | |
| 240.634° | |
| 0° 11m 7.044s / day | |
| Inclination | 5.5589° |
| 250.253° | |
| 28.478° | |
| Earth MOID | 1.51688 AU (226.922 Gm) |
| Jupiter MOID | 1.56651 AU (234.347 Gm) |
| TJupiter | 3.209 |
| Physical characteristics | |
| 25.185±0.95 km | |
| 25.107 h (1.0461 d) | |
| 0.2529±0.020 | |
| 8.8 | |
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 US 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
External links
- Lightcurve plot of 774 Armor, Palmer Divide Observatory, B. D. Warner (2006)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 774 Armor at AstDyS-2, Asteroids—Dynamic Site
- 774 Armor at the JPL Small-Body Database
