1849 Kresák

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1849 Kresák
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 14 January 1942
MPC designation (1849) Kresák
Named after
Ľubor Kresák
(Slovak astronomer)[2]
1942 AB · 1948 EO
1951 WC2
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 75.29 yr (27,500 days)
Aphelion 3.1076 AU
Perihelion 3.0009 AU
3.0542 AU
Eccentricity 0.0175
5.34 yr (1,950 days)
0° 11m 4.92s / day
Inclination 10.765°
Physical characteristics
Dimensions 21.776±2.427 km[5]
26.14 km (calculated)[3]
19.1008±0.0153 h[6]
0.057 (assumed)[3]
C (assumed)[3]
11.191±0.002 (R)[6] · 11.28[5] · 11.5[1] · 11.61±0.32[7] · 11.64[3]

1849 Kresák, provisional designation 1942 AB, is a carbonaceous Eoan asteroid from the outer region of the asteroid belt, approximately 24 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory in the middle of World War II on 14 January 1942.[8] The asteroid was later named after Slovak astronomer Ľubor Kresák.[2]

Orbit and classification[edit]

Kresák is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[4][9]:23 It orbits the Sun in the outer main-belt at a distance of 3.0–3.1 AU once every 5 years and 4 months (1,950 days). Its orbit has an eccentricity of 0.02 and an inclination of 11° with respect to the ecliptic.[1] The body's observation arc begins 6 days after its official discovery observation.[8]

Physical characteristics[edit]

Kresák has been characterized as a carbonaceous C-type asteroid.[3]

Rotation period[edit]

In January 2012, a rotational lightcurve of Kresák was obtained from photometric observations at the Palomar Transient Factory in California. In the R-band, it gave a rotation period of 19.10 hours with a brightness variation of 0.19 magnitude (U=2).[6]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Kresák measures 21.7 kilometers in diameter, and its surface has an albedo of 0.114,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 26.1 kilometers with an absolute magnitude of 11.64.[3]


This minor planet was named in honor of Slovak astronomer Ľubor Kresák (1927–1994) from the Slovak Academy of Sciences in Bratislava and president of IAU's Commission 20 in the 1970s.[2]

Kresák is known for his theoretical work on meteors and the question of their relationship with comets and minor planets, as well as for the rediscovery of the short-period comet 41P/Tuttle–Giacobini–Kresák at the Skalnaté Pleso Observatory in 1951.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3935).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 1849 Kresak (1942 AB)" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1849) Kresák. Springer Berlin Heidelberg. p. 148. ISBN 978-3-540-00238-3. Retrieved 14 December 2016. 
  3. ^ a b c d e f g "LCDB Data for (1849) Kresák". Asteroid Lightcurve Database (LCDB). Retrieved 14 December 2016. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 21 November 2017. 
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 14 December 2016. 
  6. ^ a b c 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 14 December 2016. 
  7. ^ 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. 
  8. ^ a b "1849 Kresak (1942 AB)". Minor Planet Center. Retrieved 14 December 2016. 
  9. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 21 November 2017. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 December 2016. 

External links[edit]