1916 Boreas

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1916 Boreas
Discovery [1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date1 September 1953
MPC designation(1916) Boreas
Named after
Boreas (Greek mythology)[2]
1953 RA
NEO · Amor[1][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.73 yr (23,279 days)
Aphelion3.2944 AU
Perihelion1.2506 AU
2.2725 AU
3.43 yr (1,251 days)
0° 17m 15.72s / day
Earth MOID0.2520 AU · 98.2 LD
Physical characteristics
Dimensions3.07 km (calculated)[4]
3.5 km[1]
3.4741±0.0003 h[5][a]
3.4746 h[6]
3.4746±0.0010 h[a]
3.4748±0.0010 h[a]
3.49±0.01 h[7]
0.15 (assumed)[1]
0.20 (assumed)[4]
S (Tholen), S (SMASS)
S[8] · Sw [4][9][10]
B–V = 0.852
U–B = 0.407
14.86±0.112[4][11] · 14.93[1][10]

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.


Boreas was discovered on 1 September 1953, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[3] 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.[b][12]

Orbit and classification[edit]

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.[3]

Physical characteristics[edit]

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.[4][9][10]

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.).[5][6][7][a]

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.[4]


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.[2] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6833).[13]


  1. ^ a b c d Pravec (2001) web: rotation period 3.4748±0.0010 hours with a brightness amplitude of 0.28 mag. Behrend (2001) web: rotation period 3.4741±0.0003 hours with a brightness amplitude of 0.29 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1916) Boreas
  2. ^ Central Bureau for Astronomical Telegrams – 1953 RA This member of the Amor group, not observed since 1953 (cf. Minor Planet Circ. No. 3015), has been recovered by McCrosky, Schwartz and Bulger with the 155-cm reflector some 0o.3 from an unpublished prediction by B. G. Marsden International Astronomical Union Circular 2710 for (1953 RA)


  1. ^ a b c d e f g h i j "JPL Small-Body Database Browser: 1916 Boreas (1953 RA)" (2017-05-27 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(1916) Boreas". Dictionary of Minor Planet Names – (1916) Boreas. Springer Berlin Heidelberg. p. 154. doi:10.1007/978-3-540-29925-7_1917. ISBN 978-3-540-00238-3.
  3. ^ a b c "1916 Boreas (1953 RA)". Minor Planet Center. Retrieved 10 December 2016.
  4. ^ a b c d e f "LCDB Data for (1916) Boreas". Asteroid Lightcurve Database (LCDB). Retrieved 10 December 2016.
  5. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1916) Boreas". Geneva Observatory. Retrieved 18 May 2016.
  6. ^ a b Krugly, Yu. N.; Belskaya, I. N.; Chiorny, V. G.; Shevchenko, V. G.; Gaftonyuk, N. M. (November 2002). "CCD photometry of near-Earth asteroids in 2001". In: Proceedings of Asteroids. 500: 903–906. Bibcode:2002ESASP.500..903K. Retrieved 10 December 2016.
  7. ^ a b Robinson, L. E. (June 2002). "Lightcurve Photometry of 551 Ortrud, 1118 Hanskya, and 1916 Boreas from Sunflower Observatory". The Minor Planet Bulletin. 29: 37–38. Bibcode:2002MPBu...29...37R. Retrieved 10 December 2016.
  8. ^ Dandy, C. L.; Fitzsimmons, A.; Collander-Brown, S. J. (June 2003). "Optical colors of 56 near-Earth objects: trends with size and orbit". Icarus. 163 (2): 363–373. Bibcode:2003Icar..163..363D. doi:10.1016/S0019-1035(03)00087-3. Retrieved 10 December 2016.
  9. ^ a b Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. arXiv:1310.2000. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 10 December 2016.
  10. ^ a b c Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 10 December 2016.
  11. ^ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 10 December 2016.
  12. ^ Brian G. Marsden (October 24, 1974). "International Astronomical Union Circular 2710". Central Bureau for Astronomical Telegrams. Retrieved 2011-07-05.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 December 2016.

External links[edit]