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1675 Simonida, provisional designation 1938 FB, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. Discovered by Milorad Protić in 1938, it was later named after the medieval Byzantine princess Simonida.[2]

1675 Simonida
Discovery [1]
Discovered byM. B. Protić
Discovery siteBelgrade Obs.
Discovery date20 March 1938
MPC designation(1675) Simonida
Named after
Simonida (Queen)[2]
1938 FB · 1931 AZ
1936 SG · 1941 BD
1943 VJ · 1951 CL1
1953 VD · 1958 FE
1958 GX
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.04 yr (31,427 days)
Aphelion2.5114 AU
Perihelion1.9550 AU
2.2332 AU
3.34 yr (1,219 days)
0° 17m 43.08s / day
Physical characteristics
Dimensions11.08±0.5 km (IRAS:8)[3][4]
12.16±0.52 km[5]
5.16±0.04 h[6]
5.2885±0.0005 h[7]
5.3±0.2 h[8]
0.2480±0.025 (IRAS:8)[3][4]
0.2501 (SIMPS)[3]
11.8[1] · 11.9[3][5] · 11.9±0.06[8][9] · 11.91[4]


Simonida was discovered on 20 March 1938, by Serbian astronomer Milorad Protić at Belgrade Astronomical Observatory.[10] On the same night, it was independently discovered by Belgian astronomer Fernand Rigaux at Uccle Observatory in Belgium.[2]

Classification and orbitEdit

The S-type asteroid is a member of the Flora family, a large population of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,219 days). Its orbit has an eccentricity of 0.12 and an inclination of 7° with respect to the ecliptic.[1] Simonida's first observation was a precovery taken at Lowell Observatory in 1931, extending the body's observation arc by 7 years prior to its official discovery observation.[10]

Physical characteristicsEdit


In March 1988, Polish astronomer Wiesław Z. Wiśniewski obtained a lightcurve of Simonida that gave a rotation period of 5.3 hours with a brightness variation of 0.26 magnitude (U=2).[8] In January 2004, astronomer A. Kryszczynska at Poznań Observatory measured a period of 5.2885 hours with an amplitude of 0.50 magnitude (U=2+).[7] In January 2008, photometric observations by astronomers Martine Castets, Bernard Trégon, Arnaud Leroy and Raoul Behrend gave a rotation period of 5.16 hours with a brightness variation of 0.21 (U=3-).[6]

Diameter and albedoEdit

According to the space-based Japanese Akari satellite, Simonida measures 12.16 kilometers in diameter, and its surface has an albedo of 0.211.[5] The Collaborative Asteroid Lightcurve Link, however, agrees with the results obtained by 8 observations of the Infrared Astronomical Satellite IRAS, that gave a diameter of 11.08 kilometers and an albedo of 0.25 with an absolute magnitude of 11.9.[3][4]


This minor planet was named for Byzantine princess and queen consort Simonida, the wife of medieval Serbian king Stefan Milutin and symbol of beauty in former Yugoslavia.[2] The official naming citation was published by the Minor Planet Center on 1 January 1973 (M.P.C. 3359).[11]


  1. ^ a b c d "JPL Small-Body Database Browser: 1675 Simonida (1938 FB)" (2017-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1675) Simonida". Dictionary of Minor Planet Names – (1675) Simonida. Springer Berlin Heidelberg. p. 133. doi:10.1007/978-3-540-29925-7_1676. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1675) Simonida". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
  4. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
  5. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1675) Simonida". Geneva Observatory. Retrieved 23 December 2016.
  7. ^ a b Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; Ivanova, V.; Apostolovska, G.; et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy and Astrophysics. 546: 51. Bibcode:2012A&A...546A..72K. doi:10.1051/0004-6361/201219199. Retrieved 23 December 2016.
  8. ^ a b c Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W. Retrieved 23 December 2016.
  9. ^ 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 23 December 2016.
  10. ^ a b "1675 Simonida (1938 FB)". Minor Planet Center. Retrieved 23 December 2016.
  11. ^ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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