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.
| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 16 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 arc | 89.19 yr (32,577 days) |
| Aphelion | 2.9545 AU |
| Perihelion | 1.9461 AU |
| 2.4503 AU | |
| Eccentricity | 0.2058 |
| 3.84 yr (1,401 days) | |
| 218.98° | |
| 0° 15m 25.2s / day | |
| Inclination | 6.3757° |
| 123.19° | |
| 265.10° | |
| Physical characteristics | |
| Dimensions | 13.743±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 edit
The asteroid 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 edit
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 edit
Slow rotator edit
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 edit
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 edit
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 edit
- ^ a b c d e f "JPL Small-Body Database Browser: 1689 Floris-Jan (1930 SO)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
- ^ a b c 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.
- ^ a b c d e f "LCDB Data for (1689) Floris-Jan". Asteroid Lightcurve Database (LCDB). Retrieved 22 December 2016.
- ^ 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 22 December 2016.
- ^ 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. (online, AcuA catalog p. 153)
- ^ a b c d 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.
- ^ 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 22 December 2016.
- ^ 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.
- ^ a b c 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.
- ^ 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. 115 (2): 257–262.ResearchsupportedbytheOsterreichischerFondszurForderungderwissenschaftlichenForschung. Bibcode:1982A&A...115..257S. Retrieved 22 December 2016.
- ^ 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.
- ^ a b "1689 Floris-Jan (1930 SO)". Minor Planet Center. Retrieved 22 December 2016.
- ^ 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.
External links edit
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1689 Floris-Jan at AstDyS-2, Asteroids—Dynamic Site
- 1689 Floris-Jan at the JPL Small-Body Database
