© NASA/Cassini

Saturn enters retrograde motion

Dominic Ford, Editor
From the Outer Planets feed

Objects: Saturn
Please wait
Loading 0/4
Click and drag to rotate
Mouse wheel to zoom in/out
Touch with mouse to dismiss
The sky at

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.

2157 apparition of Saturn

12 Jan 2157 – Saturn enters retrograde motion
20 Mar 2157 – Saturn at opposition
29 May 2157 – Saturn ends retrograde motion

Observing Saturn

Saturn enters retrograde motion as its 2157 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
Saturn 12h09m20s 1°29'N Virgo 0.7 18.3"

The coordinates above are given in J2000.0.

From Ashburn , it will be visible in the morning sky, becoming accessible around 23:44, when it reaches an altitude of 11° above your eastern horizon. It will then reach its highest point in the sky at 04:50, 52° above your southern horizon. It will be lost to dawn twilight around 06:41, 44° above your south-western horizon.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

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 28 Mar 2024

The sky on 28 March 2024
Sunrise
06:58
Sunset
19:29
Twilight ends
21:00
Twilight begins
05:27

18-day old moon
Waning Gibbous

86%

18 days old

Planets
Rise Culm. Set
Mercury 07:29 14:14 20:59
Venus 06:24 12:10 17:56
Moon 22:00 03:15 08:23
Mars 05:43 11:09 16:35
Jupiter 08:42 15:39 22:36
Saturn 06:07 11:43 17:19
All times shown in EDT.

Source

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.

Related news

12 Jan 2157  –  Saturn enters retrograde motion
20 Mar 2157  –  Saturn at opposition
29 May 2157  –  Saturn ends retrograde motion
24 Jan 2158  –  Saturn enters retrograde motion

Image credit

© NASA/Cassini

Share

Ashburn

Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EDT

Color scheme