Hecates Tholus

Hecates Tholus

MarsGeo-Mount
name=Hecates Tholus


caption=
location=
latitude=32.1
N_or_S=N
longitude=150.2
E_or_W=E
peak=
discoverer=
eponym=

Hecates Tholus is a Martian volcano, notable for results from the European Space Agency's Mars Express mission which indicate a major eruption took place 350 million years ago. The eruption created a caldera 10km in diameter. It has been suggested that glacial deposits later partly filled the caldera and an adjacent depression. Crater counts indicate this happened as recently as 5 to 20 million years ago. However climate models show that ice is not stable at Hecates Tholus today, pointing to climate change since the glaciers were active. It has been shown that the age of the glaciers correspond to a period of increased obliquity of Mars' rotational axis [cite journal
last = Huber et al.
first = Ernst
authorlink =
title = Discovery of a flank caldera and very young glacial activity at Hecates Tholus
journal = Nature
volume = 434
pages = 356–361
date = 17 March 2005
publisher =
doi = 10.1038/nature03423 ] .

The volcano is at location 32.1°N 150.2°E, in Elysium Planitia, and has a diameter of 183.0 km. It is the northernmost of the Elysium volcanoes; the others are Elysium Mons and Albor Tholus.

In planetary nomenclature, a "tholus" is a "small domical mountain or hill".

ee also

*Geography of Mars
*Climate of Mars

References

External links

* [http://www.google.com/mars/#lat=29.688052&lon=156.533203&zoom=4&q=Hecates%20Tholus Google Mars] - zoomable map centered on Hecates Tholus
* [http://planetarynames.wr.usgs.gov/jsp/FeatureTypesData2.jsp?systemID=4&bodyID=8&typeID=44&system=Mars&body=MarsE&type=Tholus,%20tholi&sort=AName&show=Fname&show=Lat&show=Long&show=Diam&show=Stat&show=Orig List of Martian tholi]
* [http://www.esa.int/SPECIALS/Mars_Express/SEMTXD2PGQD_0.html 3-D view of Hecates Tholus from Mars Express]


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