4090 Říšehvězd

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4090 Říšehvězd
Discovery [1]
Discovered by A. Mrkos
Discovery site Kleť Obs.
Discovery date 2 September 1986
MPC designation (4090) Říšehvězd
Named after
Říše hvězd
(astronomy journal)[2]
1986 RH1 · 1931 FF
1971 KB · 1982 KX
1988 AR3 · 1989 GU
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 86.03 yr (31,421 days)
Aphelion 2.8513 AU
Perihelion 1.8632 AU
2.3573 AU
Eccentricity 0.2096
3.62 yr (1,322 days)
0° 16m 20.28s / day
Inclination 1.3288°
Physical characteristics
Dimensions 6.27 km (calculated)[3]
7.195±0.299 km[4][5]
4.5312±0.0090 h (R)[6]
4.550±0.020 h (R)[7]
4.5553±0.0090 h (R)[6]
0.20 (assumed)[3]
12.91±0.24[8] · 13.080±0.160 (R)[7] · 13.114±0.002 (R)[6] · 13.2[1] · 13.38[3] · 13.4[4]

4090 Říšehvězd, provisional designation 1986 RH1, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter.

It was discovered by Czech astronomer Antonín Mrkos at Kleť Observatory on 2 September 1986. Named for the astronomy journal Říše hvězd, it is known as the one with the most diacritics in its name among all named minor planets.[2][9]

Classification and orbit[edit]

The S-type asteroid asteroid orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 7 months (1,322 days). Its orbit has an eccentricity of 0.21 and an inclination of 1° with respect to the ecliptic.[1] The first observation was made at the U.S. Yerkes Observatory in 1931, extending the asteroid's observation arc by 55 years prior to its official discovery.[9]

Physical characteristics[edit]

In 2009 and 2014, several rotational lightcurves were obtained for this asteroid at the Palomar Transient Factory. They gave a concurring rotation period between 4.53 and 4.56 hours with a brightness variation between 0.32 and 0.41 magnitude (U=2/2/2).[6][7]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 7.2 kilometers in diameter and its surface has an albedo of 0.149,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 6.3 kilometers, based on an absolute magnitude of 13.38.[3]


This minor planet was named after the periodically released Czech popular astronomy journal Říše hvězd ("the realm of stars"), which was initially published by the Czech Astronomical Society.[2]

Říše hvězd reported discoveries in the fields of astronomy, astrophysics and space exploration and supplied information about the Czech–Slovak astronomical community. The body's name was proposed by Jana Tichá, Miloš Tichý and Zdeněk Moravec.[2] Naming citation was published on 28 August 1996 (M.P.C. 27734).[10]

See also[edit]

  • Jiří Grygar, chairman of the Czech Astronomical Society and editor at Říše hvězd


  1. ^ a b c d "JPL Small-Body Database Browser: 4090 Risehvezd (1986 RH1)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4090) Říšehvězd. Springer Berlin Heidelberg. p. 349. ISBN 978-3-540-00238-3. Retrieved 25 October 2016. 
  3. ^ a b c d e f "LCDB Data for (4090) Říšehvězd". Asteroid Lightcurve Database (LCDB). Retrieved 25 October 2016. 
  4. ^ 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. Retrieved 25 October 2016. 
  5. ^ 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 5 December 2016. 
  6. ^ a b c d 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 25 October 2016. 
  7. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493Freely accessible. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 25 October 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 25 October 2016. 
  9. ^ a b "4090 Risehvezd (1986 RH1)". Minor Planet Center. Retrieved 25 October 2016. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 October 2016. 

External links[edit]