astro.wikisort.org - Asteroid

1916 Boreas, provisional designation 1953 RA, is an eccentric, stony asteroid and near-Earth object of the Amor group, approximately 3 kilometers in diameter. After its discovery in 1953, it became a lost asteroid until 1974. It was named after Boreas from Greek mythology.

1916 Boreas

Discovery[1]
Discovered by	S. Arend
Discovery site	Uccle Obs.
Discovery date	1 September 1953
Designations
MPC designation	(1916) Boreas
Pronunciation	/ˈbɔːriəs/[2]
Named after	Boreas (Greek mythology)[3]
Alternative designations	1953 RA
Minor planet category	NEO · Amor[1][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	63.73 yr (23,279 days)
Aphelion	3.2944 AU
Perihelion	1.2506 AU
Semi-major axis	2.2725 AU
Eccentricity	0.4497
Orbital period (sidereal)	3.43 yr (1,251 days)
Mean anomaly	252.13°
Mean motion	0° 17m 15.72s / day
Inclination	12.884°
Longitude of ascending node	340.64°
Argument of perihelion	335.83°
Earth MOID	0.2520 AU · 98.2 LD
Physical characteristics
Dimensions	3.07 km (calculated)[5] 3.5 km[1]
Synodic rotation period	3.4741±0.0003 h[6][lower-alpha 1] 3.4746 h[7] 3.4746±0.0010 h[lower-alpha 1] 3.4748±0.0010 h[lower-alpha 1] 3.49±0.01 h[8]
Geometric albedo	0.15 (assumed)[1] 0.20 (assumed)[5]
Spectral type	S (Tholen), S (SMASS) S[9] · Sw[5][10][11] B–V = 0.852 U–B = 0.407
Absolute magnitude (H)	14.86±0.112[5][12] · 14.93[1][11]

Discovery

Boreas was discovered on 1 September 1953, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[4] The asteroid was observed for 2 months and then with time became a lost asteroid. It was recovered in 1974, by Richard Eugene McCrosky, G. Schwartz and JH Bulger based on a predicted position by Brian G. Marsden.[lower-alpha 2][13]

Orbit and classification

Boreas orbits the Sun at a distance of 1.3–3.3 AU once every 3 years and 5 months (1,251 days). Its orbit has an eccentricity of 0.45 and an inclination of 13° with respect to the ecliptic.[1]

The near-Earth asteroid has an Earth minimum orbit intersection distance of 0.2520 AU (37,700,000 km),[1] which corresponds to 98.2 lunar distances. Its observation arc begins with it official discovery observation at Uccle in 1953.[4]

Physical characteristics

On the Tholen and SMASS taxonomic scheme, Boreas is classified as a common S-type asteroid with a stony composition.[1] It has also been characterized as a Sw-subtype.[5][10][11]

Several rotational lightcurves gave a rotation period between 3.4741 and 3.49 hours with a brightness variation between 0.25 and 0.35 magnitude (U=2/2/3/n.a.).[6][7][8][lower-alpha 1]

In 1994, astronomer Tom Gehrels estimated Boreas to measure 3.5 kilometers in diameter, based on an assumed albedo of 0.15.[1] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.07 kilometers with an absolute magnitude of 14.93.[5]

Naming

This minor planet is named after the Greek god of the north wind, Boreas, as the asteroid was discovered moving rapidly northward after passing the ascending node of its orbit.[3] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6833).[14]

Notes

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 21 July 2011 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• 1916 Boreas at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 1916 Boreas at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 1916 Boreas at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1916) Boreas

(1916) Boreas ist ein Asteroid des Amor-Typs, der am 1. September 1953 von dem belgischen Astronomen Sylvain Arend am Königlichen Observatorium von Belgien (IAU-Code 012) in Uccle entdeckt wurde.

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- [en] 1916 Boreas

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[ru] (1916) Борей

(1916) Борей (др.-греч. Βορέας) — небольшой околоземный астероид из группы Амура (III), который входит в состав семейства Алинды. Он был открыт 1 сентября 1953 года американским астрономом Сильвеном Ареном в обсерватории Уккел и назван в честь древнегреческого бога северного ветра Борея[1].

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