2020, December 13: Saturn or Bust, Mars in Eastern Sky

Jupiter and Saturn, December 13, 2020
2020, December 13: One hour after sunset, Jupiter is 0.8° to the lower right of Saturn. Find them low in the southwestern sky.

December 13, 2020: The Great Conjunction countdown: 8 days! Jupiter’s gap to Saturn is 0.8° as the planets appear in the southwest after sunset.  Farther east, Mars continues its eastward march in Pisces.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 7:10 a.m. CST; Sunset, 4:20 p.m. CST.  Check local sources for sunrise and sunset times for your location.

Jupiter continues to close in on Saturn eight evenings before the Great Conjunction of 2020.  This evening bright Jupiter is 0.8° to the lower right of Saturn.

Great Conjunction Countdown: 8 days.

Begin looking for them as night falls in the southwestern sky.  Jupiter is the brightest star in the region.  Saturn is dimmer and to Jupiter’s upper left.  Find them before they get too low in the sky.  From about 45 minutes after sunset to 90 minutes after sunset, they are in their best location to see.  Jupiter sets about 2.5 hours after sunset.  Saturn follows a few minutes later.

Mars, December 13, 2020
2020, December 13: One hour after sunset, Mars is in the southeast. It is 0.7° to the upper left of Zeta Piscium (ζ Psc) and 2.7° to the lower left of Epsilon Piscium (ε Psc).

Mars is farther east.  It is over halfway up in the sky in the southeast.  It is the brightest star in the region as it marches eastward in front of the starry background of Pisces.

Use a binocular to spot it near Zeta Piscium (ζ Psc on the chart) and Epsilon Piscium (ε Psc).  Notice Hamal on the chart and find it in the sky.  Mars is heading generally in that direction and passes below the star later next month.

Read about Mars during December.

Detailed note: One hour after sunset Saturn is over 16° in altitude in the southwest, 0.8° to the upper left of Jupiter. Great Conjunction Countdown: 8 days.  Farther east Mars is over 45° up in the southeast, 0.7° to the upper left of ζ Psc and 2.7° to the lower left of ε Psc.

For more about the Great Conjunction, read our feature article. This is the closest Jupiter – Saturn conjunction since 1623.

Read more about the planets during December.


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Categories: Astronomy, Sky Watching

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