1834 Palach

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1834 Palach
Discovery [1]
Discovered by L. Kohoutek
Discovery site Bergedorf Obs.
Discovery date 22 August 1969
MPC designation (1834) Palach
Named after
Jan Palach (Czech student)[2]
1969 QP
main-belt ·  · (outer)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 47.26 yr (17,260 days)
Aphelion 3.2373 AU
Perihelion 2.8142 AU
3.0258 AU
Eccentricity 0.0699
5.26 yr (1,922 days)
0° 11m 14.28s / day
Inclination 9.4352°
Physical characteristics
Dimensions 17.156±0.414[5]
18.059±0.264 km[6]
19.52 km (calculated)[3]
20.23±0.87 km[7]
3.1358±0.0009 h[8]
3.139±0.001 h[9]
0.14 (assumed)[3]
S (assumed)[3]
11.3[1][3] · 11.50[6][7] · 11.54±0.20[10]

1834 Palach, provisional designation 1969 QP, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 22 August 1969 by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg, Germany, and named after Czech student Jan Palach.[2][11]

Orbit and classification[edit]

Palach is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[4][12]:23

It orbits the Sun in the outer main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,922 days). Its orbit has an eccentricity of 0.07 and an inclination of 9° with respect to the ecliptic.[1] As no precoveries were taken, and no prior identifications were made, Palach's observation arc begins with its official discovery observation in 1969.[11]

Physical characteristics[edit]

Rotation period[edit]

In September 2006, a rotational lightcurve for Palach was obtained from photometric observations made by French amateur astronomer Laurent Bernasconi at St. Michel sur Meu. It gave a rotation period of 3.139 hours with a brightness amplitude of 0.16 magnitude (U=2).[9] In May 2010, a second lightcurve, obtained by Zachary Pligge at Oakley Southern Sky Observatory, Australia, gave a period of 3.1358 hours with an amplitude of 0.13 (U=2).[8]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Palach measures between 17.16 and 20.23 kilometers in diameter, and its surface has an albedo between 0.109 and 0.151.[5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Eoan asteroids of 0.14 and calculates a diameter of 19.52 kilometers with an absolute magnitude of 11.3.[3]


It was named in memory of Czech student Jan Palach (1948–1969), who burned himself to death, as a protest against the Soviet occupation of Czechoslovakia that followed and ended the national reform movement known as the Prague Spring.[2] The official naming citation was published by the Minor Planet Center on 25 August 1991 (M.P.C. 18643).[13]


  1. ^ a b c d "JPL Small-Body Database Browser: 1834 Palach (1969 QP)" (2016-11-23 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1834) Palach. Springer Berlin Heidelberg. p. 147. ISBN 978-3-540-00238-3. Retrieved 15 December 2016. 
  3. ^ a b c d e f "LCDB Data for (1834) Palach". Asteroid Lightcurve Database (LCDB). Retrieved 15 December 2016. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 21 November 2017. 
  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 15 December 2016. 
  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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 15 December 2016. 
  7. ^ 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 15 December 2016. 
  8. ^ a b Pligge, Zachary; Monnier, Adam; Pharo, John; Stolze, Kellen; Yim, Arnold; Ditteon, Richard (January 2011). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2010 May". The Minor Planet Bulletin. 38 (1): 5–7. Bibcode:2011MPBu...38....5P. ISSN 1052-8091. Retrieved 15 December 2016. 
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1834) Palach". Geneva Observatory. Retrieved 15 December 2016. 
  10. ^ 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 15 December 2016. 
  11. ^ a b "1834 Palach (1969 QP)". Minor Planet Center. Retrieved 15 December 2016. 
  12. ^ 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. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 December 2016. 

External links[edit]