Pluto is listed on the Planetoids page.
↓ Satellite Atmospheres ↓

RECENT DETECTIONS
Phosphine detected on Venus (JUL): "Phosphine gas in the cloud decks of Venus," Greaves et al. Nature Astron 5, 655-664 (2021). Please also see here for an extended summary of the efforts of Greaves at al. and currently available peer-reviewed work confirming and disconfirming the presence of phosphine on Venus and the implications thereof.

     
AsH3
arsine
ASTROMOLECULE OF THE MONTH FOR FEB 2020
CH3
methyl radical
ASTROMOLECULE OF THE MONTH FOR JAN 2015
CH4
methane
ASTROMOLECULE OF THE MONTH FOR AUG 2004
C2H2
acetylene
ASTROMOLECULE OF THE MONTH FOR JUN 2013
C2H4
ethylene
ASTROMOLECULE OF THE MONTH FOR JAN 2007
C2H6
ethane
C3H8
propane
ASTROMOLECULE OF THE MONTH FOR MAR 2004
C3H4
propyne
C4H2
diacetylene
ASTROMOLECULE OF THE MONTH FOR JUN 2004
C6H6
benzene
CO
carbon monoxide
ASTROMOLECULE OF THE MONTH FOR JUN 2003
CO2
carbon dioxide
ASTROMOLECULE OF THE MONTH FOR MAR 2011
CS
carbon monosulfide
ASTROMOLECULE OF THE MONTH FOR SEP 2006
ClO
chlorine monoxide
GeH4
germane
H2
hydrogen
ASTROMOLECULE OF THE MONTH FOR OCT 2013
HCN
hydrogen cyanide
ASTROMOLECULE OF THE MONTH FOR SEP 2010
HCl 
hydrogen chloride
ASTROMOLECULE OF THE MONTH FOR NOV 2011
HF
hydrogen fluoride
ASTROMOLECULE OF THE MONTH FOR APR 2004
H2O
water
H2S
hydrogen sulfide
ASTROMOLECULE OF THE MONTH FOR NOV 2009
H2S+
ionized H2S
N2
nitrogen
ASTROMOLECULE OF THE MONTH FOR AUG 2008
NH3
ammonia
ASTROMOLECULE OF THE MONTH FOR FEB 2010
NO
nitric oxide
N2O
nitrous oxide
ASTROMOLECULE OF THE MONTH FOR JUN 2014
O2
oxygen
O3
ozone
OCS
carbonyl suifide
ASTROMOLECULE OF THE MONTH FOR SEP 2005
PH3
phosphine
ASTROMOLECULE OF THE MONTH FOR MAR 2007
S3
trisulur
SO
sulfur monoxide
ASTROMOLECULE OF THE MONTH FOR NOV 2012
SO2
sulfur dioxide
ASTROMOLECULE OF THE MONTH FOR AUG 2003
OSSO
disulfur dioxide




SATELLITES

For the most part, the moons of the solar system have very tenuous atmospheres (known as exospheres) that consist of volatile molecules created when surface materials are subject to irradiation by the solar wind or by ions accelerated by the magnetic field of the planet to which the satellite belongs. The one moon with a dense atmosphere is Titan, where the pressure at the surface is about half again as much as the pressure on Earth at sea level. Io has volcanoes that erupt gases into its atmosphere.

EARTH'S MOON
Luna CH4 (1975)    CO (1975)    NH3 (1975)
H2O (2021)
MOONS OF JUPITER
Callisto CO2 (1992)    O2 (2003)
Europa O2 (1995)    H2O (2019)
Ganymede O3 (1996)    O2 (1998)
Io SO2 (1990)    SO (1996)    S2 (2000)    NaCl (2003)
MOONS OF SATURN
Dione O3 (1997)    CO2 (2016)    O2 (2016)
Rhea O3 (1997)    CO2 (2016)    O2 (2016)
N2H4 (2021)
Titan CH4 (1944)    H2 (1972)    C2H4 (1981)    C2H6 (1981)
HCN (1981)    C4H2 (1991)    HC3N (1991)    C2N2 (1991)
N2 (1982)    CO (1983)    C2H2 (1984)    H2O (1998)
C3H8 (2003)    C6H6 (2003)    HNC (2011)    C4N2(nd) (2015)
C2H5CN (2015)    C3H4 (2019)    c-C3H2 (2020)    CH3C3N (2020)
MOONS OF NEPTUNE
Triton CH4 (1979)    N2 (1989)    CO (2010)
pink=tentative detection
Image credit: https://phys.org/news/2015-02-solar-yearbook.html


Acknowledgments

Listings of molecular species found in the atmospheres of the planets are taken in part from Photochemistry of Planetary Atmospheres by Y. L. Yung & W. B. DeMore (Oxford University Press, New York), 1999.

Images of the planets are adapted from Views of the Solar System by Calvin J. Hamilton.



Maintained by DE Woon
Updated 20 July 2021