1672 Gezelle

1672 Gezelle, provisional designation 1935 BD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 29 January 1935, by Belgian astronomer Eugène Delporte at Royal Observatory of Belgium in Uccle, Belgium.[11] It was later named after Flemish poet and Roman Catholic priest Guido Gezelle.[2]

1672 Gezelle
Shape model of Gezelle from its lightcurve
Discovery [1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date29 January 1935
Designations
(1672) Gezelle
Named after
Guido Gezelle
(poet and priest)[2]
1935 BD · 1929 AA
1933 SE1 · 1939 VK
1950 SX · 1978 NA8
A924 EO
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc83.62 yr (30,542 days)
Aphelion4.0486 AU
Perihelion2.2952 AU
3.1719 AU
Eccentricity0.2764
5.65 yr (2,063 days)
183.87°
0° 10m 28.2s / day
Inclination1.0672°
181.29°
255.12°
Physical characteristics
Dimensions26.205±0.202 km[4]
26.335±0.216 km[5]
26.56±1.86 km[6]
27.90 km (calculated)[3]
40.6821±0.0001 h[7]
40.6824±0.0005 h[8]
40.72±0.01 h[9]
0.055±0.004[5]
0.057 (assumed)[3]
0.092±0.014[6]
0.0936±0.0162[4]
C [3][10]
11.10[6] · 11.1[4] · 11.46±0.32[10] · 11.5[1][3]

    Orbit and classification

    The C-type asteroid orbits the Sun at a distance of 2.3–4.0 AU once every 5 years and 8 months (2,063 days). Its orbit has an eccentricity of 0.28 and an inclination of 1° with respect to the ecliptic.[1] Gezelle's first identification as A924 EO at Heidelberg Observatory remained unused. Its observation arc begins 9 days after its official discovery observation.[11]

    Physical characteristics

    Rotation period

    Astronomer James W. Brinsfield obtained a rotational lightcurve of Gezelle at the Via Capote Observatory (G69) in October 2008. It gave a well defined rotation period of 40.72 hours with a brightness variation of 0.56 magnitude (U=3).[9] In 2016, similar periods of 40.6821 and 40.6824 hours were obtained from modeled photometric observations derived from the Lowell Photometric Database and other sources (U=n.a.).[7][8]

    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, Gezelle measures between 26.21 and 26.56 kilometers in diameter and its surface has an albedo between 0.055 and 0.093.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 27.90 kilometers based on an absolute magnitude of 11.5.[3]

    Naming

    This minor planet was named in memory of famous Flemish poet and Roman Catholic priest Guido Gezelle (1830–1899), who wrote extensively on religion and nature.[2] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6832).[12]

    References
    1. "JPL Small-Body Database Browser: 1672 Gezelle (1935 BD)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
    2. Schmadel, Lutz D. (2007). "(1672) Gezelle". Dictionary of Minor Planet Names – (1672) Gezelle. Springer Berlin Heidelberg. p. 133. doi:10.1007/978-3-540-29925-7_1673. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1672) Gezelle". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
    4. 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.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 23 December 2016.
    6. 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)
    7. Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 23 December 2016.
    8. Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 23 December 2016.
    9. Brinsfield, James W. (April 2009). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2008 4th Quarter". The Minor Planet Bulletin. 36 (2): 64–66. Bibcode:2009MPBu...36...64B. ISSN 1052-8091. Retrieved 23 December 2016.
    10. 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 23 December 2016.
    11. "1672 Gezelle (1935 BD)". Minor Planet Center. Retrieved 23 December 2016.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 23 December 2016.

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