Mars's 687-day orbit around the Sun will carry it to its furthest point to the Sun – its aphelion – at a distance of 1.67 AU.
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.
Finding Mars
Mars's distance from the Sun doesn't affect its appearance. From South El Monte, at the moment of aphelion it will be visible in the morning sky, becoming accessible around 18:49, when it reaches an altitude of 7° above your eastern horizon. It will then reach its highest point in the sky at 00:39, 66° above your southern horizon. It will be lost to dawn twilight around 06:06, 12° above your western horizon.
A chart of the path of Mars across the sky in 2138 can be found here, and a chart of its rising and setting times here.
The position of Mars at the moment it passes aphelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude | Angular Size |
| Mars | 11h00m10s | 11°01'N | Leo | -1.1 | 13.7" |
The coordinates above are given in J2000.0.
The sky on 16 Jul 2026
| The sky on 16 July 2026 | ||||||||||||||||||||||||||||||||||
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7% 2 days old |
All times shown in PDT.
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Source
The circumstances of this event were computed using the DE440 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.
Related news
| 20 Jan 2138 | – Mars enters retrograde motion |
| 01 Mar 2138 | – Mars at opposition |
| 03 Mar 2138 | – Mars at perigee |
| 12 Apr 2138 | – Mars ends retrograde motion |
Image credit
© NASA/Hubble Space Telescope