1689 Floris-Jan

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1689 Floris-Jan
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 16 September 1930
MPC designation 1689 Floris-Jan
Named after
Floris-Jan van der Meulen
(5,000th Visitor Contest Winner)[2]
1930 SO · 1926 PG
1928 DN · 1934 VV
1943 AC · 1949 OF
1949 ON1 · 1949 OY
1951 CW · 1966 BP
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 87.66 yr (32,017 days)   
Aphelion 2.9523 AU
Perihelion 1.9467 AU
2.4495 AU
Eccentricity 0.2052
3.83 yr (1,400 days)
Inclination 6.3808°
Physical characteristics
Dimensions 13.99±0.23 km[4]
16.122±4.950 km[5]
16.213 km[6]
13.74±1.91 km[7]
16.21 km (taken)[3]
145 h[8]
144.85±0.20 h[9]
0.083 h[10]
B–V = 0.685
U–B = 0.265

1689 Floris-Jan, provisional designation 1930 SO, is a stony asteroid and a slow rotator from the inner regions of the asteroid belt, about 16 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 16 September 1930.[11] It was independently discovered by Soviet astronomer Evgenii Skvortsov at the Crimean Simeiz Observatory five days later.[2]

The asteroid orbits the Sun at a distance of 1.9–3.0 AU once every 3 years and 10 months (1,400 days). Its orbit is tilted by 6 degrees to the plane of the ecliptic and shows a relatively high eccentricity of 0.21.[1] According to the surveys carried out by the Akari, WISE and NEOWISE missions, the geometric albedo of the S-type asteroid lies in the range of 0.13–0.18.[4][5][6][7]

Light-curve observations from the 1980s already revealed that the asteroid was a very slow rotator with a rotation period of 145 hours. At the time, the six-day period was a new record among slowly rotating asteroids ever measured.[8][9][10] It was also assumed that it might be a tumbling asteroid with a non-principal axis rotation.[9][3]

The asteroid was named after Floris-Jan van der Meulen, the 5,000th visitor to a 14-day astronomical exhibition at the Leiden Observatory.[2]


  1. ^ a b c "JPL Small-Body Database Browser: 1689 Floris-Jan (1930 SO)" (2015-10-23 last obs.). Jet Propulsion Laboratory. Retrieved November 2015. 
  2. ^ a b c Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1689) Floris-Jan. Springer Berlin Heidelberg. p. 134. ISBN 978-3-540-29925-7. Retrieved November 2015. 
  3. ^ a b c d "LCDB Data for (1689) Floris-Jan". Asteroid Lightcurve Database (LCDB). Retrieved November 2015. 
  4. ^ a b c Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; Kataza, Hirokazu; Takita, Satoshi; Oyabu, Shinki; Ueno, Munetaka; Matsuhara, Hideo; Onaka, Takashi (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 November 2015. 
  5. ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; McMillan, R. S.; Spahr, T.; Cutri, R. M.; Wright, E.; Watkins, J.; Mo, W.; Maleszewski, C. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015. 
  6. ^ a b c 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 November 2015. 
  7. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; Cabrera, M. S. (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. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015. 
  8. ^ a b Schober, H. J.; Surdej, J.; Harris, A. W.; Young, J. W. (November 1982). "The six-day rotation period of 1689 Floris-Jan - A new record among slowly rotating asteroids". Astronomy and Astrophysics: 257–262. Bibcode:1982A&A...115..257S. Retrieved November 2015. 
  9. ^ a b c Harris, A. W.; Young, J. W. (October 1989). "Asteroid lightcurve observations from 1979-1981". Icarus: 314–364. Bibcode:1989Icar...81..314H. doi:10.1016/0019-1035(89)90056-0. ISSN 0019-1035. Retrieved November 2015. 
  10. ^ a b Pych, W. (March 1999). "Short period oscillations in the light curve of the asteroid 1689 Floris-Jan". Astronomy and Astrophysics. Bibcode:1999A&A...343L..75P. Retrieved November 2015. 
  11. ^ "1689 Floris-Jan (1930 SO)". Minor Planet Center. Retrieved November 2015. 

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