3137 Horky

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3137 Horky
Discovery [1]
Discovered by A. Mrkos
Discovery site Kleť Obs.
Discovery date 16 September 1982
MPC designation (3137) Horky
Named after
(Czech hill and village)
1982 SM1 · 1971 UC2
1976 AC
main-belt[1][2] · (inner)
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 68.17 yr (24,900 d)
Aphelion 2.8571 AU
Perihelion 1.9482 AU
2.4026 AU
Eccentricity 0.1892
3.72 yr (1,360 d)
0° 15m 52.92s / day
Inclination 2.4738°
Physical characteristics
Mean diameter
6.685±0.089 km[4]
SMASS = C[2]

3137 Horky, provisional designation 1982 SM1, is a background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 16 September 1982, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic. The likely stony asteroid was named for a hill near the Czech village of Horky.[1]

Orbit and classification[edit]

Orbital diagram of Horky

Horky is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 9 months (1,360 days; semi-major axis of 2.4 AU). Its orbit has an eccentricity of 0.19 and an inclination of 2° with respect to the ecliptic.[2]

The body's observation arc begins with a precovery taken at Palomar Observatory in November 1949, almost 33 years prior to its official discovery observation at Klet.[1]

Close approaches[edit]

On 1 May 2019, Horky will pass 15 Eunomia at a distance of 1,440,000 km (0.0096 AU). It is also projected to make close approaches to 29 Amphitrite, 7 Iris and 10 Hygiea.[2]

Physical characteristics[edit]

In the SMASS classification, Horky is a carbonaceous C-type asteroid.[2] However, based on the obtained albedo by the Wide-field Infrared Survey Explorer (WISE), it is rather a stony S-type (see below). As of 2018, no rotational lightcurve of this asteroid has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, Horky measures 6.685 kilometers in diameter and its surface has an albedo of 0.207,[4] which indicates that is likely of a stony rather than carbonaceous composition. It has an absolute magnitude of 13.3.[2]


This minor planet was named after a hill and its nearby village Horky in the Czech Republic, where the discoverer installed his first telescope in 1939.[1] The official naming citation was published by the Minor Planet Center on 29 November 1993 (M.P.C. 22828).[5]


  1. ^ a b c d e f "3137 Horky (1982 SM1)". Minor Planet Center. Retrieved 27 April 2018. 
  2. ^ a b c d e f g h i "JPL Small-Body Database Browser: 3137 Horky (1982 SM1)" (2018-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2018. 
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 27 April 2018. 
  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 27 April 2018. 
  5. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2018. 

External links[edit]