1840 Hus

1840 Hus (prov. designation: 1971 UY) is a stony Koronis asteroid from the outer regions of the asteroid belt, approximately 12.5 kilometers (7.8 miles) in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at the Bergedorf Observatory in Hamburg, Germany.[1] The S-type asteroid has a rotation period of 4.8 hours and is likely elongated in shape.[4][10] It was later named after 15th-century theologian Jan Hus.[2]

1840 Hus
Shape model of Hus from its lightcurve
Discovery[1]
Discovered byL. Kohoutek
Discovery siteBergedorf Obs.
Discovery date26 October 1971
Designations
(1840) Hus
Named after
Jan Hus (early Reformer)[2]
1971 UY · 1931 TS3
1935 NC · 1953 CG
main-belt[1][3] · (outer)[4]
Koronis[5][6]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc86.72 yr (31,673 d)
Aphelion2.9646 AU
Perihelion2.8731 AU
2.9188 AU
Eccentricity0.0157
4.99 yr (1,821 d)
174.31°
0° 11m 51.36s / day
Inclination2.4077°
40.525°
14.250°
Physical characteristics
Mean diameter
12.446±0.193 km[7][8]
12.592±0.123 km[9]
4.7483±0.0008 h[10]
0.2554±0.0232[9]
0.261±0.043[8]
S (family-based)[11]
11.6[9]
11.7[1][3][4]

    Orbit and classification

    Hus is a core member of the Koronis family (605),[5][6] a very large asteroid family of almost 6,000 known asteroids with nearly co-planar ecliptical orbits.[11] It orbits the Sun in the outer main-belt at a distance of 2.9–3.0 AU once every 5 years (1,821 days; semi-major axis of 2.92 AU). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic.[3] Hus was first observed as 1931 TS3 at the Lowell Observatory in October 1931. The body's observation arc begins with its observation as 1953 CG at the Goethe Link Observatory in January 1953, more than 18 years prior to its official discovery observation at Hamburg.[1]

    Naming

    This minor planet was named after Czech Jan Hus (1372–1415), a fifteenth century Bohemian theologian, rector of Charles University in Prague and forerunner of the protestant reformation. He was condemned to death by the Council of Constance and burned at the stake for his reformation ideas.[2] Jan Hus is also known as John Huss in the English speaking world. The official naming citation was published by the Minor Planet Center on 20 December 1974 (M.P.C. 3757).[12]

    Physical characteristics

    Based on the asteroid's membership to the Koronis family and its relatively high geometric albedo determined by the Wide-field Infrared Survey Explorer (WISE), Hus is very likely a stony S-type asteroid.

    Rotation period and pole

    In June 2006, a rotational lightcurve of Hus was obtained from photometric observations taken by Maurice Clark at the Chiro Observatory (320) in Western Australia. Lightcurve analysis gave a rotation period of 4.780±0.002 hours with a high brightness variation of 0.85 magnitude (U=2-), strongly indicative of an elongated, non-spherical shape.[13] In March 2016, a synthetic lightcurve gave a similar period of 4.749057±0.000001 hours, using sparse-in-time photometry data from the Lowell Photometric Database (U=n.a.).[14] More recent lightcurve analysis during observations of the 1840 Hus apparition in 2020, from the MIT Koronis Family Asteroids Rotation Lightcurve Observing Program, gave a secure rotation period of 4.7483±0.0008 hours.[10]

    Diameter and albedo

    According to the survey carried out by NASA's WISE telescope with its subsequent NEOWISE mission, Hus measures 12.4 and 12.6 kilometers in diameter, and its surface has an albedo of 0.261 and 0.255, respectively.[7][8][9] Conversely, the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057, rather than one for a stony body, as indicated by WISE/NEOWISE – and calculates therefore a twice as large diameter of 25.4 kilometers, as the lower the albedo, the larger the body's diameter for a constant absolute magnitude.[4]

    References
    1. "1840 Hus (1971 UY)". Minor Planet Center. Retrieved 7 December 2018.
    2. Schmadel, Lutz D. (2007). "(1840) Hus". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 147. doi:10.1007/978-3-540-29925-7_1841. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 1840 Hus (1971 UY)" (2018-06-30 last obs.). Jet Propulsion Laboratory. Retrieved 7 December 2018.
    4. "LCDB Data for (1840) Hus". Asteroid Lightcurve Database (LCDB). Retrieved 7 December 2018.
    5. "Asteroid 1840 Hus". Small Bodies Data Ferret. Retrieved 7 December 2018.
    6. "Asteroid (1840) Hus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 October 2019.
    7. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M. Retrieved 7 December 2018.
    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. S2CID 118745497.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    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. S2CID 35447010. (catalog)
    10. Slivan, Stephen M.; McLellan-Cassivi, Claire; Shishido, Rila; Wang, Nieky (April 2021). "Rotation Period of Koronis Family Member 1840 Hus". The Minor Planet Bulletin. 48 (2): 112. Bibcode:2021MPBu...48..112S.
    11. 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. S2CID 119280014.
    12. Schmadel, Lutz D. (2009). "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.
    13. Clark, Maurice (July 2010). "Asteroid Lightcurves from the Chiro Observatory". The Minor Planet Bulletin. 37 (3): 89–92. Bibcode:2010MPBu...37...89C. ISSN 1052-8091.
    14. 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. S2CID 118427201.

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