1689 Floris-Jan

1689 Floris-Jan, provisional designation 1930 SO, is a stony asteroid and a slow rotator from the inner regions of the asteroid belt, approximately 16 kilometers in diameter. Discovered by Hendrik van Gent in 1930, it was named after a contest winner of an exhibition at Leiden Observatory.

1689 Floris-Jan
Discovery [1]
Discovered byH. van Gent
Discovery siteJohannesburg Obs.
(Leiden Southern Station)
Discovery date16 September 1930
Designations
(1689) Floris-Jan
Named after
Floris-Jan van der Meulen
(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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc89.19 yr (32,577 days)
Aphelion2.9545 AU
Perihelion1.9461 AU
2.4503 AU
Eccentricity0.2058
3.84 yr (1,401 days)
218.98°
0° 15m 25.2s / day
Inclination6.3757°
123.19°
265.10°
Physical characteristics
Dimensions13.743±1.905 km[4]
13.99±0.23 km[5]
16.122±4.950 km[6]
16.21 km (taken)[3]
16.213 km[7]
0.083 h (fragm.)[8]
144.85±0.20 h[9]
145 h[10]
0.1271±0.0508[6]
0.1353[7]
0.175±0.050[4]
0.184±0.007[5]
S [3]
B–V = 0.685[1]
U–B = 0.265[1]
11.74±0.05[3][7][9] · 11.79±0.19[11] · 11.82[1][4][5][6]

    Discovery

    It was discovered on 16 September 1930, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[12] It was independently discovered by Soviet astronomer Evgenii Skvortsov at the Crimean Simeiz Observatory five days later.[2]

    Orbit and classification

    Floris-Jan orbits the Sun in the inner main-belt at a distance of 1.9–3.0 AU once every 3 years and 10 months (1,401 days). Its orbit has an eccentricity of 0.21 and an inclination of 6° with respect to the ecliptic.[1] First identified as 1926 PG at Simeiz Observatory in 1926, the body's observation arc begins 3 days after its official discovery observation at Johannesburg in 1930.[12]

    Physical characteristics

    Slow rotator

    In the 1980s, photometric lightcurve observations already revealed that Floris-Jan is a very slow rotator with a rotation period of 145 hours and a brightness variation of 0.4 magnitude (U=3).[10] At the time, this six-day period was a new record among all minor planets with a known rotation period, and it was assumed, that Floris-Jan might also be a tumbling asteroid with a non-principal axis rotation.[3][9]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Floris-Jan measures between 13.74 and 16.12 kilometers in diameter, and its surface has an albedo between 0.127 and 0.184.[4][5][6] The Collaborative Asteroid Lightcurve Link agrees with Petr Pravec's revised WISE-data, that is an albedo of 0.135 and a diameter of 16.21 kilometers based on an absolute magnitude of 11.74.[3]

    Naming

    This minor planet was named for Floris-Jan van der Meulen, the 5,000th visitor to a 14-day astronomical exhibition at the Leiden Observatory.[2] The official naming citation was published by the Minor Planet Center on 1 March 1973 (M.P.C. 3470).[13]

    References
    1. "JPL Small-Body Database Browser: 1689 Floris-Jan (1930 SO)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
    2. Schmadel, Lutz D. (2007). "(1689) Floris-Jan". Dictionary of Minor Planet Names – (1689) Floris-Jan. Springer Berlin Heidelberg. p. 134. doi:10.1007/978-3-540-29925-7_1690. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1689) Floris-Jan". Asteroid Lightcurve Database (LCDB). Retrieved 22 December 2016.
    4. 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 22 December 2016.
    5. 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. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. 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 22 December 2016.
    8. Pych, W. (March 1999). "Short period oscillations in the light curve of the asteroid 1689 Floris-Jan". Astronomy and Astrophysics. 343: L75–L77. arXiv:astro-ph/9806384. Bibcode:1999A&A...343L..75P. Retrieved 22 December 2016.
    9. Harris, A. W.; Young, J. W. (October 1989). "Asteroid lightcurve observations from 1979-1981". Icarus. 81 (2): 314–364. Bibcode:1989Icar...81..314H. doi:10.1016/0019-1035(89)90056-0. ISSN 0019-1035. Retrieved 22 December 2016.
    10. 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. 115 (2): 257–262.ResearchsupportedbytheOsterreichischerFondszurForderungderwissenschaftlichenForschung. Bibcode:1982A&A...115..257S. Retrieved 22 December 2016.
    11. 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 22 December 2016.
    12. "1689 Floris-Jan (1930 SO)". Minor Planet Center. Retrieved 22 December 2016.
    13. 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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