916 America

916 America
Discovery[1]
Discovered by	G. N. Neujmin
Discovery date	7 August 1915
Designations
MPC designation	(1915) S1
Pronunciation	/əˈmɛrɪkə/[2]
Named after	United States of America
Symbol	(astrological)
Orbital characteristics[1]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	92.21 yr (33681 days)
Aphelion	2.9247 AU (437.53 Gm)
Perihelion	1.8037 AU (269.83 Gm)
Semi-major axis	2.3642 AU (353.68 Gm)
Eccentricity	0.23706
Orbital period (sidereal)	3.64 yr (1327.8 d)
Mean anomaly	245.58°
Mean motion	0° 16m 16.068s / day
Inclination	11.093°
Longitude of ascending node	329.79°
Argument of perihelion	41.772°
Physical characteristics
Mean radius	16.615±0.65 km
Synodic rotation period	38 h (1.6 d)
Geometric albedo	0.0530±0.004
Absolute magnitude (H)	11.4

916 America is a minor planet orbiting the Sun in the main belt between Mars and Jupiter.

It was discovered on 7 August 1915 by the Russian astronomer Grigory Nikolaevich Neujmin at Simeis, Russian Empire.[1] Originally designated 916^ΣI, it was renamed '916 America' on 24 February 1923 after the Council of Astronomers at Pulkovo Observatory decided to commemorate "the friendly relations of the astronomical observatories and astronomers".[3] Another possible reason for the name was as a mark of appreciation for the help given during the 1921 Russian famine by the American Relief Administration under the later President Herbert Hoover.[4]

In 1986, assuming that the asteroid was of S-type and that it had a diameter of 15 km, the rotational period was measured to be 38 hours.[5] Observations by the Infrared Astronomical Satellite have since shown that it has a diameter of 33.2±1.3 km, with an absolute magnitude of 11.20 and an albedo of 0.053±0.004.[1]

References

"JPL Small-Body Database Browser - 916 America (1915 S1)". Retrieved 2 May 2016.
Noah Webster (1884) A Practical Dictionary of the English Language
(1923). Popular Astronomy, volume 31, page 364.
Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer. p. 82. ISBN 3-540-00238-3.
Dimartino, M. (1986). "A Photoelectric Program for Small and Unusual Asteroids". Asteroids, Comets, Meteors II; Proceedings of the International Meeting, Uppsala, Sweden, June 3–6, 1985. Uppsala, Sweden, Astronomiska Observatoriet: 81. Bibcode:1986acm..proc...81D.

External links

916 America at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
916 America at the JPL Small-Body Database

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[ssd_jpl-1] "JPL Small-Body Database Browser - 916 America (1915 S1)". Retrieved 2 May 2016.

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[3] (1923). Popular Astronomy, volume 31, page 364.

[4] Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer. p. 82. ISBN 3-540-00238-3.

[1986_Dimartino-5] Dimartino, M. (1986). "A Photoelectric Program for Small and Unusual Asteroids". Asteroids, Comets, Meteors II; Proceedings of the International Meeting, Uppsala, Sweden, June 3–6, 1985. Uppsala, Sweden, Astronomiska Observatoriet: 81. Bibcode:1986acm..proc...81D.