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5318 Dientzenhofer, provisional designation 1985 HG1, is a stony background asteroid from the inner regions of the asteroid belt, approximately 6 kilometers (3.7 miles) in diameter. It was discovered on 21 April 1985, by Czech astronomer Antonín Mrkos at the Kleť Observatory in Bohemia, Czech Republic.[1] The transitional S-type asteroid has a rotation period of 8.06 hours.[4] It was named after the German Baroque architects Christoph and Kilian Ignaz Dientzenhofer.[1]

5318 Dientzenhofer
Discovery [1]
Discovered byA. Mrkos
Discovery siteKleť Obs.
Discovery date21 April 1985
MPC designation(5318) Dientzenhofer
Named after
Christoph Dientzenhofer
Kilian Ignaz Dientzenhofer
(German Baroque architects)
1985 HG1 · 1983 UL1
1985 JZ · 1988 CX2
main-belt[1][2] · (inner)
background[3] · Flora[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc46.48 yr (16,975 d)
Aphelion2.5941 AU
Perihelion1.9861 AU
2.2901 AU
3.47 yr (1,266 d)
0° 17m 3.84s / day
Physical characteristics
Mean diameter
5.41 km (calculated)[4]
6.267±0.116 km[5][6]
8.062±0.001 h[7]
8.062±0.002 h[8]
0.24 (assumed)[4]
SMASS = Sk[2][3]


Orbit and classificationEdit

Dientzenhofer is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[4]

The asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.6 AU once every 3 years and 6 months (1,266 days; semi-major axis of 2.29 AU). Its orbit has an eccentricity of 0.13 and an inclination of 3° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in May 1971, or 14 years prior to its official discovery observation at Klet.[1]

Physical characteristicsEdit

In the Bus–Binzel SMASS classification, Dientzenhofer is an Sk-subtype, that transitions from the stony S-type to the uncommon K-type asteroids.[2][3]

Rotation periodEdit

In 2016, two rotational lightcurves of Dientzenhofer were obtained from photometric observations by Italian astronomers at the Eurac Observatory (C62), Astronomical Observatory University of Siena (K54) and Carpione Observatory (K49). Lightcurve analysis gave an identical rotation period of 8.062 hours with a brightness amplitude of 0.70 and 0.84 magnitude, respectively (U=3-/3), indicative of a non-spheroidal shape.[4][7][8]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Dientzenhofer measures 6.267 kilometers in diameter and its surface has an albedo of 0.215,[5][6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 5.41 kilometers based on an absolute magnitude of 13.5.[4]


This minor planet was named after Christoph Dientzenhofer (1655–1722) and his son Kilian Ignaz Dientzenhofer (1689–1751), members of the Dientzenhofer family of architects. Christoph and Kilian Ignaz are known for the churches and monasteries built in Prague during the 17th and 18th century in the Bohemian Baroque architecture style.[1] The official naming citation was published by the Minor Planet Center on 9 January 2001 (M.P.C. 41934).[10]


  1. ^ a b c d e f "5318 Dientzenhofer (1985 HG1)". Minor Planet Center. Retrieved 26 May 2018.
  2. ^ a b c d e f "JPL Small-Body Database Browser: 5318 Dientzenhofer (1985 HG1)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2018.
  3. ^ a b c d "Asteroid 5318 Dientzenhofer". Small Bodies Data Ferret. Retrieved 26 May 2018.
  4. ^ a b c d e f g h "LCDB Data for (5318) Dientzenhofer". Asteroid Lightcurve Database (LCDB). Retrieved 26 May 2018.
  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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 26 May 2018.
  6. ^ 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 May 2018. (catalog)
  7. ^ a b Casalnuovo, Giovanni Battista (July 2017). "Lightcurve Analysis for Ten Main Belt Asteroids". The Minor Planet Bulletin. 44 (3): 178–180. Bibcode:2017MPBu...44..178C. ISSN 1052-8091. Retrieved 26 May 2018.
  8. ^ a b Salvaggio, Fabio; Marchini, Alessandro; Papini, Riccardo (October 2016). "Lightcurve and Rotation Period Determination for 5318 Dientzenhofer and 9083 Ramboehm". The Minor Planet Bulletin. 43 (4): 348–349. Bibcode:2016MPBu...43..348S. ISSN 1052-8091. Retrieved 26 May 2018.
  9. ^ 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 May 2018.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 May 2018.

External linksEdit