4176 Sudek

4176 Sudek, provisional designation 1987 DS, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 17 kilometers (11 miles) in diameter. It was discovered on 24 February 1987, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic.[1] The presumed C-type asteroid has a rotation period of 8.16 hours.[4] It was named in memory of Czech photographer Josef Sudek.[1]

4176 Sudek
Discovery [1]
Discovered byA. Mrkos
Discovery siteKleť Obs.
Discovery date24 February 1987
Designations
(4176) Sudek
Named after
Josef Sudek [1]
(Czech photographer)
1987 DS · 1949 FF1
1952 VC · 1974 TC1
1979 SX5 · 1982 FO
main-belt [1][2] · (outer)
Themis [3][4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc64.97 yr (23,731 d)
Aphelion3.5436 AU
Perihelion2.6582 AU
3.1009 AU
Eccentricity0.1428
5.46 yr (1,994 d)
275.67°
0° 10m 49.8s / day
Inclination2.5994°
114.33°
356.06°
Physical characteristics
Mean diameter
14.51±3.83 km[5]
15.86 km (calculated)[4]
17.87±0.77 km[6]
17.96±2.11 km[7]
18.858±0.243 km[8][9]
8.164±0.0092 h[10]
0.08 (assumed)[4]
0.095±0.019[8]
0.095±0.033[7][9]
0.097±0.009[6]
0.12±0.11[5]
C (assumed)[4]
11.8[9]
11.90[5][6][7]
11.909±0.002 (R)[10]
12.0[2]
12.19±0.18[11]
12.36[4]

    Orbit and classification

    Sudek is a Themistian asteroid that belongs to the Themis family (602),[4][3] a very large family of carbonaceous asteroids, named after 24 Themis.[12]

    It orbits the Sun in the outer main-belt at a distance of 2.7–3.5 AU once every 5 years and 6 months (1,994 days; semi-major axis of 3.1 AU). Its orbit has an eccentricity of 0.14 and an inclination of 3° with respect to the ecliptic.[2] The asteroid was first observed as 1949 FF1 at Simeiz Observatory in March 1949. The body's observation arc begins with its observation as 1952 VC at Goethe Link Observatory in November 1952.[1]

    Occultation

    On 21 January 2014 Sudek, at magnitude 15.5, occulted the star 2UCAC 39655315 in the constellation Gemini during which the magnitude dropped from 11.8 (star) to 15.5 (asteroid). This event was visible over parts of Japan and China.[13]

    Physical characteristics

    Sudek is an assumed carbonaceous C-type asteroid,[4] in line with the Themis family's overall spectral type.[12]:23

    Rotation period

    In September 2012, a rotational lightcurve of Sudek was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 8.164 hours with a brightness amplitude of 0.32 magnitude (U=2).[10]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Sudek measures between 14.51 and 18.858 kilometers in diameter and its surface has an albedo between 0.095 and 0.12.[5][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 15.86 kilometers based on an absolute magnitude of 12.36.[4]

    Naming

    Based on a proposal by Miloš Tichý, this minor planet was named after Czech photographer Josef Sudek (1896–1976), known for his black-and-white series of still lifes and panoramas of Prague.[1] The official naming citation was published by the Minor Planet Center on 11 February 1998 (M.P.C. 31295).[14]

    References
    1. "4176 Sudek (1987 DS)". Minor Planet Center. Retrieved 27 April 2018.
    2. "JPL Small-Body Database Browser: 4176 Sudek (1987 DS)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2018.
    3. "Asteroid 4176 Sudek – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    4. "LCDB Data for (4176) Sudek". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2018.
    5. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117.
    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. 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.
    8. 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.
    9. 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.
    10. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    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.
    12. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    13. Preston, Steve. "(4176) Sudek – asteroid occultation". www.asteroidoccultation.com. Archived from the original on 1 February 2014.
    14. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2018.

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