774 Armor

774 ArmorDiscovery

Discovered by| C. le Morvan
Discovery site| Paris
Discovery date| 19 December 1913
Designations

MPC designation

| (774) Armor

Alternative designations

| 1913 TW
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 107.33 yr (39203 d)
|{{{apsis}}}|helion}}| 3.5625 astronomical unit|AU (532.94 Gm)
|{{{apsis}}}|helion}}| 2.5318 AU (378.75 Gm)

Semi-major axis

| 3.0472 AU (455.85 Gm)
Eccentricity| 0.16914
Orbital period| 5.32 yr (1942.9 d)
Mean anomaly| 240.634°
Mean motion| 0° 11m 7.044s / day
Inclination| 5.5589°
Longitude of ascending node| 250.253°

|{{{apsis}}}|helion}}

| 28.478°
Earth MOID| 1.51688 AU (226.922 Gm)
Jupiter MOID| 1.56651 AU (234.347 Gm)
TJupiter| 3.209
Physical characteristics
Mean radius| 25.185±0.95 km
Rotation period| 25.107 h (1.0461 d)
Geometric albedo| 0.2529±0.020
Absolute magnitude (H)| 8.8

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 astronomical unit|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 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

1. ↑ 1.0 1.1 1.2 "774 Armor (1913 TW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=774.
2. ↑ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer Berlin Heidelberg, p. 72, ISBN 9783642297182, https://books.google.com/books?id=aeAg1X7afOoC&pg=PA72.
3. ↑ Burbine, Thomas H.; Binzel, Richard P. (October 2002), "Small Main-Belt Asteroid Spectroscopic Survey in the Near-Infrared", Icarus 159 (2): 468–499, doi:10.1006/icar.2002.6902, Bibcode: 2002Icar..159..468B.
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

* Lightcurve plot of 774 Armor, Palmer Divide Observatory, B. D. Warner (2006)
* Asteroid Lightcurve Database (LCDB), query form (info )
* 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
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 774 Armor at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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