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By fragmentation modeling of 39 bright and faint Geminids, we deduced that thermal stress causes their initial cracking. This stress is generated in meteoroids after they enter the Earth's atmosphere and before ablation begins.

• Henych, T., Borovička, J., Čapek, D., Vojáček, V., Spurný, P., Koten, P., Shrbený, L., 2026. Geminids are initially cracked by atmospheric thermal stress. Accepted for publication in Astronomy & Astrophysics, arXiv.org reprint
  

A contributed talk given at the IMC 2024 conference in Kutná Hora, Czechia.

• Small Geminids are more fragile than large ones, 20 September 2024[pdf, 913 KB]
• WGN 52.6 article

A contributed talk at the interplanetary matter seminar in Modra, Slovakia.

• Semiautomatic fragmentation modeling of meteoroids of different masses, 22 May 2024[pdf, 1.2 MB]

We used the fragmentation modeling program to describe the physical properties of centimeter-sized Geminid meteoroids. We find that Geminids are made of coherent and compact carbonaceous material and derive the distribution of their mechanical strength proxy.

• Henych, T., Borovička, J., Vojáček, V., Spurný, P., 2024. Mechanical strength distribution in Geminid meteoroids derived via fireball modeling. Astronomy & Astrophysics 683, A229, 13 pages, arXiv.org reprint
  

A talk at the Astronomical Institute seminar in Ondřejov.

• Geminids are made of compact carbonaceous material, 4 December 2023[pdf, 1.9 MB]

A contributed talk given at the ACM 2023 conference in Flagstaff, Arizona, USA.

• Mechanical strength of Geminid meteoroids from detailed modeling, 23 June 2023[pdf, 1.0 MB]

A talk at the astronomical seminar at Masaryk University in Brno.

• Modeling of fireballs or speaking stones, 17 April 2023[pdf, 4.3 MB]

We developed a semi-automatic program for meteoroid fragmentation modeling using parallel genetic algorithms. It allows us to determine the most probable fragmentation cascade of the meteoroid, and also to specify its initial mass and velocity and their uncertainties.

• Henych, T., Borovička, J., Spurný, P., 2023. Semi-automatic meteoroid fragmentation modeling using genetic algorithms. Astronomy & Astrophysics 671, A23, 16 pages, arXiv.org reprint
  

A talk at the Astronomical Institute seminar in Ondřejov.

• Automatic fireball data modeling, 29 March 2021[pdf, 2.3 MB]

A novel approach to fragment size distribution interpretation of this extremly young family is taken in this paper. The main controlling process is the newly identified spall regime of cratering.

• Henych, T. and Holsapple, K. A., 2018. Interpretations of family size distributions: The Datura example. Icarus~304, pp. 127–134, arXiv.org reprint
  popular article on sciencetrends.com
  

A role of many small collisions on the overall asteroid shapes is investigated in this article.

• Henych, T. and Pravec, P. 2015. Slowly increasing elongations of non-spherical asteroids caused by collisions. MNRAS~454, Issue 2, pp. 1704–1710, arXiv.org reprint

A talk given at the Summer Interdepartmental Meeting of the Astronomical Institute in Ondřejov.

• Subcatastrophic collisions between asteroids, 1 June 2015[pdf, 5.6 MB]

A contributed talk given at the workshop in Belgrade, Serbia.

• Subcatastrophic collisions between asteroids, 12 February 2015[pdf, 4.2 MB]

Člověk vykoná delší pouť, aby na jejím konci zjistil, že je zase na začátku.

• excitation of asteroid rotations through impacts[pdf, 1.7 MB]
• vše související s dizertační prací

The article contains main ideas of our recent research on collisional excitation of asteroid rotations. It is described more thoroughly in the thesis above.

• Henych, T. and Pravec, P., 2013. Asteroid rotation excitation by subcatastrophic impacts. MNRAS~432, Issue 2, pp. 1623–1631, arXiv.org reprint

Krátký příspěvek na květnovém vyškovském novoluní (2012).

• O dvojplanetkách, štěněti a družici GAIA[pdf, 75 KB]
• obrázky k přednášce[tar.gz, 752 KB]

Přednáška pronesená na Podzimním astronomickém kursu ve Vyškově v září 2011.

• hobiti sluneční soustavy[pdf, 142 KB]
• obrázky k přednášce[tar.gz, 20 MB]

Plantáž je v mírném svahu, který je ale v závěru prudší, než se zdá na první pohled. Chuť je sladší, květová, velmi jemná, postupně však na jazyku trpkne a aftertaste je víc než drsný… tentokrát o binárních asteroidech.

• dynamické charakteristiky binárních asteroidů[pdf, 321 KB]

Práce, do které jsem po určitou dobu destiloval většinu svých schopností a investoval nemálo času. Je to o planetkách…

• světelné křivky planetek[pdf, 429 KB]