2021, January 10: Mercury, Jupiter, and Saturn, Group Closely

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2021: January 10: After sunset, Jupiter, Saturn, and Mercury fit into a tight circle. Mercury is 1.6° to the lower left of Saturn and 2.8° below Jupiter.

January 10, 2021:  Mercury makes a pretty triangle with Jupiter and Saturn, nearly 3 weeks after the giant planets’ great conjunction.  This close grouping is of three planets is unusual.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 7:17 a.m. CST; Sunset, 4:40 p.m. CST.  Check local sources for sunrise and sunset times for your location.

Speedy Mercury is with Jupiter and Saturn low in the west-southwest at about 30 minutes after sunset.  Because of the bright twilight, use a binocular to first locate bright Jupiter.  Saturn is 2.2° to the lower right of the Jovian Giant.  Mercury, brighter than Saturn and dimmer than Jupiter, is 1.6° to the lower left of Saturn and 2.8° below Jupiter.

This is the closest grouping since Mercury, Venus, and Mars clustered together on May 21, 2011.  The three planets fit within a circle that is 2°23’ in diameter.

Mercury joins Venus and Jupiter in 34 days (Feb 13) in a wider grouping (4°36’).  This grouping occurs when the planets are merely 10° from the sun.

From this date we wait until April 20, 2026 to see Mercury, Mars, and Saturn clustered in a 1° 40’ circle.

This evening the planets are setting early; this makes the window small to observe them before they disappear below the horizon.

Jupiter sets only 68 minutes after sunset.  To see this tight grouping star looking 30 minutes after sunset for about the next 15 minutes.

Detailed Note: Thirty minutes after sunset, Jupiter, about 7° up in the west-southwest, is 2.2° to the upper left of Saturn. Use a binocular to locate them, especially Saturn.  Mercury (m = −0.9) makes a pretty triangle with Jupiter and Saturn.  It is 1.6° to the lower left of Saturn and 2.8° below Jupiter. The three planets fit within a small circle (2°23’) This is the tightest grouping since Mercury, Venus, and Mars clustered together (2°8’) on May 21, 2011. Mercury joins Venus and Jupiter in 34 days (Feb 13) in a wider grouping (4°36’), although this grouping occurs a mere 10° west of the sun. From this date we wait until April 20, 2026 to see Mercury, Mars, and Saturn clustered in a 1° 40’ circle. Read about Mars during January.

Read more about the planets during January.

2021, July 29: Jupiter – Mars Opposition

July 29, 2021: The Jupiter – Mars opposition occurs this evening.  The planets are 180° apart as viewed from our planet.  Mars is setting as Jupiter rises.

2021, July 27: Four Evening Planets

July 27, 2021:  Evening Star Venus, Mars, Saturn and Jupiter are in the evening sky.  Mars is nearing its conjunction with Regulus in two evenings.

2021, July 26: Evening Sky, Mars Closes In

July 26, 2021:  Four bright planets are in the evening sky.  Mars closes in on Regulus for their conjunction in three evenings.  Brilliant Evening Star Venus appears to the upper left of the impending Mars – Regulus conjunction.  Saturn and Jupiter are low in the southeastern sky after sunset.

2021, July 25: Evening Sky, Mars on Final Approach

July 25, 2021:  Four evenings before its conjunction with Regulus, find Mars in the western sky to the lower right of Venus.  As the calendar day ends, look for the moon below bright Jupiter.



Categories: Astronomy, Sky Watching

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