3141 Buchar

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3141 Buchar
Discovery [1]
Discovered byA. Mrkos
Discovery siteKleť Obs.
Discovery date2 September 1984
MPC designation(3141) Buchar
Named after
Emil Buchar[1]
(Czechoslovakian astronomer)
1984 RH · 1952 PE
1952 RQ · 1953 UF
1953 VK2 · 1977 NM
1977 OE · 1979 YW9
A905 CE
main-belt · (outer)[2][3]
background[4] · Cybele
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc113.21 yr (41,350 d)
Aphelion3.6579 AU
Perihelion3.1382 AU
3.3980 AU
6.26 yr (2,288 d)
0° 9m 26.28s / day
Physical characteristics
Mean diameter
35.91 km (derived)[3]
36.05±2.2 km[5]
40.13±0.87 km[6]
11.41±0.01 h[7]
0.0656 (derived)[3]
D (S3OS2)[8]
C (assumed)[3]

3141 Buchar, provisional designation 1984 RH, is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately 36 kilometers (22 miles) in diameter. It was discovered on 2 September 1984, by Czech astronomer Antonín Mrkos at the Kleť Observatory.[1] The D-type asteroid has a rotation period of 11.4 hours.[3] It was named in memory of Czechoslovakian astronomer Emil Buchar.[1]

Orbit and classification[edit]

Buchar is located in the dynamical region of the Cybele asteroids. It is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outermost asteroid belt at a distance of 3.1–3.7 AU once every 6 years and 3 months (2,288 days; semi-major axis of 3.4 AU). Its orbit has an eccentricity of 0.08 and an inclination of 11° with respect to the ecliptic.[2] In February 1905, the asteroid was first observed as A905 CE at Heidelberg Observatory, where the body's observation arc begins with its observation as 1952 RQ in September 1952, or 32 years prior to its official discovery observation at Klet.[1]

Physical characteristics[edit]

Buchar has been characterized as dark D-type asteroid in both the Tholen-like and Bus–Binzel-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).[8] It is also an assumed C-type asteroid.[3]

Rotation period[edit]

In November 2004, a rotational lightcurve of Buchar was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave a rotation period of 11.41 hours with a brightness amplitude of 0.47 magnitude (U=2+).[7]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the Japanese Akari satellite, Buchar measures between 36.05 and 40.13 kilometers in diameter and its surface has an albedo between 0.069 and 0.0858.[5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0656 and a diameter of 35.91 kilometers based on an absolute magnitude of 10.8.[3]


This minor planet was named in memory of Czechoslovakian astronomer Emil Buchar (1901–1979), discoverer of asteroid 1055 Tynka and one of the pioneers of satellite geodesy. He was a professor of astronomy and geodesy at Czech Technical University in Prague.[1] The official naming citation was published by the Minor Planet Center on 29 November 1993 (M.P.C. 22828).[9]


  1. ^ a b c d e f "3141 Buchar (1984 RH)". Minor Planet Center. Retrieved 12 May 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 3141 Buchar (1984 RH)" (2018-04-27 last obs.). Jet Propulsion Laboratory. Retrieved 12 May 2018.
  3. ^ a b c d e f g h "LCDB Data for (3141) Buchar". Asteroid Lightcurve Database (LCDB). Retrieved 12 May 2018.
  4. ^ a b "Asteroid 3141 Buchar – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  6. ^ a b c d 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. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (3141) Buchar". Geneva Observatory. Retrieved 12 May 2018.
  8. ^ a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 12 May 2018.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 May 2018.

External links[edit]