1714 Sy

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1714 Sy
Discovery [1]
Discovered byL. Boyer
Discovery siteAlgiers Obs.
Discovery date25 July 1951
MPC designation(1714) Sy
Named after
Frédéric Sy (astronomer)[2]
1951 OA · 1949 YM
1950 DE1 · 1951 NM
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc67.24 yr (24,559 days)
Aphelion2.9621 AU
Perihelion2.1732 AU
2.5677 AU
4.11 yr (1,503 days)
0° 14m 22.56s / day
Physical characteristics
Dimensions12.39 km (calculated)[3]
13.998±0.881 km[4]
0.20 (assumed)[3]
L[5] · S[3]
11.85±0.29[5] · 11.9[1][3][4]

1714 Sy, provisional designation 1951 OA, is a stony asteroid from the central regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 25 July 1951, by French astronomer Louis Boyer at Algiers Observatory in Algeria, North Africa, and named after French astronomer and orbit computer Frédéric Sy.[2][6]


Sy orbits the Sun in the central main-belt at a distance of 2.2–3.0 AU once every 4 years and 1 month (1,503 days). Its orbit has an eccentricity of 0.15 and an inclination of 8° with respect to the ecliptic.[1]

It was first identified as 1949 YM at Goethe Link Observatory in 1948, extending the body's observation arc by 3 years prior to its official discovery observation at Algiers.[6]

Physical characteristics[edit]

PanSTARRS' large-scale survey characterized Sy as a L-type asteroid, a rare subtype which falls into the broader complex of stony S-type asteroids.[5]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sy measures 13.998 kilometers in diameter, and its surface has an albedo of 0.157,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 12.39 kilometers with on an absolute magnitude of 11.9.[3]


In March 2012, photometric observations at the Oakley Southern Sky Observatory (E09), Australia, included this asteroid as a target. Due to rain an cloud coverage, no lightcurve could be constructed, and therefor no rotation period could be derived, however the 86 photometric data points allowed to find a maximum brightness variation of 0.95 magnitude (U=none).[7] A high brightness amplitude of 0.95 is a strong indicator, that the body has a non-spheroidal shape. As of 2017, Sy's rotation period still remains unknown.[3]


This minor planet was named after Frédéric Sy, who worked as a human orbit computer and as an assistant astronomer at Algiers and Paris Observatory, respectively. At Algiers Observatory, he observed asteroids and comets and was the first to discoverer a numbered minor planet, 858 El Djezaïr, in 1916.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4419).[8]


  1. ^ a b c d "JPL Small-Body Database Browser: 1714 Sy (1951 OA)" (2017-03-25 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1714) Sy". Dictionary of Minor Planet Names – (1714) Sy. Springer Berlin Heidelberg. p. 136. doi:10.1007/978-3-540-29925-7_1715. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1714) Sy". Asteroid Lightcurve Database (LCDB). Retrieved 3 April 2017.
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 3 April 2017.
  5. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 3 April 2017.
  6. ^ a b "1714 Sy (1951 OA)". Minor Planet Center. Retrieved 3 April 2017.
  7. ^ Moravec, Patricia; Cochren, Joseph; Gerhardt, Michael; Harris, Andrew; Karnemaat, Ryan; Melton, Elizabeth; et al. (October 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 January-April". The Minor Planet Bulletin. 39 (4): 213–216. Bibcode:2012MPBu...39..213M. ISSN 1052-8091. Retrieved 4 April 2017.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 April 2017.

External links[edit]