Perturbation of the Mars atmosphere by the near-collision with Comet C/2013 A1 (Siding Spring)

Roger V. Yelle, A. Mahieux, S. Morrison, V. Vuitton, S. M. Hörst

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The martian upper atmosphere could be strongly perturbed by the near collision with Comet C/2013 A1 (Siding Spring). Significant mass and energy will be deposited in the upper atmosphere of Mars if the comet coma is sufficiently dense. We predict that comet H2O production rates larger than 1028 molecules/s would produce temperature increases exceeding 30K and the H density in the upper atmosphere will approximately double. The temperature perturbation will persist for several hours and the increased H density for tens of hours. Drag on orbiting spacecraft may increase by substantial factors, depending upon comet activity, because of the thermal perturbation to the atmosphere. Observation of these perturbations may provide insight into the thermal and chemical balances of the atmosphere.

Original languageEnglish (US)
Pages (from-to)202-210
Number of pages9
StatePublished - Jul 15 2014


  • Atmospheres, structure
  • Comets
  • Mars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Perturbation of the Mars atmosphere by the near-collision with Comet C/2013 A1 (Siding Spring)'. Together they form a unique fingerprint.

Cite this