Dominic Ford, Editor
From the Outer Planets feed
Unlike most of the planets, which follow almost exactly circular orbits around the Sun which only vary in their distance from the Sun by a few percent, Mars has a significantly elliptical orbit. Its distance from the Sun varies between 1.38 AU and 1.67 AU – a variation of over 20% – meaning that it receives 31% less heat and light from the Sun at aphelion as compared to perihelion.
Mars's distance from the Sun doesn't affect its appearance. From Ashburn, at the moment of perihelion it will be difficult to observe as it will appear no higher than 19° above the horizon. It will become visible around 17:35 (EDT) as the dusk sky fades, 19° above your south-western horizon. It will then sink towards the horizon, setting 2 hours and 46 minutes after the Sun at 19:37.
The exact position of Mars at the moment it passes perihelion will be:
|Object||Right Ascension||Declination||Constellation||Magnitude||Angular Size|
The coordinates above are given in J2000.0.
|The sky on 21 August 2019|
20 days old
All times shown in EDT.
The circumstances of this event were computed using the DE405 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).
This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.
|25 Mar 2029||– Mars at opposition|
|04 May 2031||– Mars at opposition|
|27 Jun 2033||– Mars at opposition|
|15 Sep 2035||– Mars at opposition|
© NASA/Hubble Space Telescope