296 days ago
Dominic Ford, Editor
From the Outer Planets feed
Saturn will enter retrograde motion, halting its usual eastward movement through the constellations, and turning to move westwards instead. This reversal of direction is a phenomenon that all the solar system's outer planets periodically undergo, a few months before they reach opposition.
The retrograde motion is caused by the Earth's own motion around the Sun. As the Earth circles the Sun, our perspective changes, and this causes the apparent positions of objects to move from side-to-side in the sky with a one-year period. This nodding motion is super-imposed on the planet's long-term eastward motion through the constellations.
The diagram below illustrates this. The grey dashed arrow shows the Earth's sight-line to the planet, and the diagram on the right shows the planet's apparently movement across the sky as seen from the Earth:
The retrograde motion of a planet in the outer solar system. Not drawn to scale.
2022 apparition of Saturn
|04 Jun 2022||–||Saturn enters retrograde motion|
|14 Aug 2022||–||Saturn at opposition|
|22 Oct 2022||–||Saturn ends retrograde motion|
Saturn enters retrograde motion as its 2022 apparition gets underway, although it has already been visible for some weeks in the pre-dawn sky.
Its celestial coordinates as it enters retrograde motion will be:
|Object||Right Ascension||Declination||Constellation||Magnitude||Angular Size|
The coordinates above are given in J2000.0.
From Ashburn , it will be visible in the dawn sky, rising at 00:53 (EDT) and reaching an altitude of 34° above the southern horizon before fading from view as dawn breaks around 05:04.
Over the following weeks, Saturn will reach its highest point in the sky four minutes earlier each night, gradually becoming visible in the evening sky, as well as the pre-dawn sky, as it approaches opposition.
The sky on 04 Jun 2022
|The sky on 04 June 2022|
5 days old
All times shown in EDT.
The circumstances of this event were computed using the DE430 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.
|02 Aug 2021||– Saturn at opposition|
|14 Aug 2022||– Saturn at opposition|
|27 Aug 2023||– Saturn at opposition|
|08 Sep 2024||– Saturn at opposition|