1840 Hus

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1840 Hus
Discovery [1]
Discovered by L. Kohoutek
Discovery site Bergedorf Obs.
Discovery date 26 October 1971
MPC designation (1840) Hus
Named after
Jan Hus (early Reformer)[2]
1971 UY · 1931 TS3
1935 NC · 1953 CG
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 85.46 yr (31,215 days)
Aphelion 2.9651 AU
Perihelion 2.8685 AU
2.9168 AU
Eccentricity 0.0166
4.98 yr (1,820 days)
0° 11m 52.08s / day
Inclination 2.4088°
Physical characteristics
Dimensions 12.446±0.193[4]
12.592±0.123 km[5]
25.44 km (calculated)[3]
4.749057 h[6]
4.780±0.002 h[7]
0.057 (assumed)[3]
11.6[5] · 11.7[1][3] · 12.10±0.19[8]

1840 Hus, provisional designation 1971 UY, is an asteroid from the outer regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg, Germany.[9] It was later named after 15th-century theologian Jan Hus.[2]

Orbit and classification[edit]

Hus orbits the Sun in the outer main-belt at a distance of 2.9–3.0 AU once every 4 years and 12 months (1,820 days). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic.[1]

The first astrometric record of Hus is a precovery taken at Lowell Observatory in 1931. Its first used observation was another precovery taken at Goethe Link Observatory in 1953, extending the body's observation arc by 18 years prior to its official discovery observation. At both these observatories, the asteroid was also identified as 1931 TS3 and 1953 CG, respectively.[9]

Physical characteristics[edit]

Rotation period and pole[edit]

In June 2006, a rotational lightcurve of Hus was obtained from photometric observations taken at Chiro Observatory in Western Australia. It gave a rotation period of 4.780 hours with a brightness variation of 0.85 magnitude (U=2-).[7] A second lightcurve was published in March 2016, gave a similar period of 4.749 hours, using sparse-in-time photometry data from the Lowell Photometric Database (U=n.a.).[6]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer 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.[5][4] However, the Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for carbonaceous asteroids of 0.057, rather than one for a stony body, as indicated by WISE/NEOWISE. CALL therefor calculates 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.[3]


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 approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3757).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 1840 Hus (1971 UY)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 December 2016. Retrieved 1 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1840) Hus. Springer Berlin Heidelberg. p. 147. ISBN 978-3-540-00238-3. Archived from the original on 12 March 2016. Retrieved 14 December 2016. 
  3. ^ a b c d e f "LCDB Data for (1840) Hus". Asteroid Lightcurve Database (LCDB). Archived from the original on 4 March 2016. Retrieved 14 December 2016. 
  4. ^ a b c 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 14 December 2016. 
  5. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Archived (PDF) from the original on 29 July 2017. Retrieved 14 December 2016. 
  6. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909Freely accessible. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 14 December 2016. 
  7. ^ a b 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. Retrieved 14 December 2016. 
  8. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 14 December 2016. 
  9. ^ a b "1840 Hus (1971 UY)". Minor Planet Center. Retrieved 14 December 2016. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Archived from the original on 1 July 2017. Retrieved 14 December 2016. 

External links[edit]