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2021, April 20: Bright Jupiter, Saturn, Morning Planets

Twilight

Twilight is the period of time before or after sunset when the upper atmosphere is illuminated by the sun that is below the horizon.

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April 20, 2021: Bright Jupiter and Saturn are in the southeastern sky before sunrise, gently moving eastward compared to the starry backdrop of Capricornus.

Chart – Caption – 2021, April 20: Jupiter and Saturn are in the southeastern sky before sunrise, with Capricornus as the starry background.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:02 a.m. CDT; Sunset, 7:38 p.m. CDT.  Check local sources for sunrise and sunset times for your location.

Morning Sky

Morning planets Jupiter and Saturn are in the southeast before sunrise.  One hour before sunrise, Jupiter is over 13° above the east-southeast horizon.  It is the brightest star in the region, and it outshines all other stars in the sky this morning.

Look at Jupiter with a binocular, you can see up to four of its largest satellites.  The binocular also reveals the starry background.  The Jovian Giant is 3.4° to the upper left of Deneb Algiedi (δ Cap on the chart), 0.5° to the lower left of Mu Capricorni (μ Cap) and 2.6° to the upper right of Iota Aquarii (ι Aqr).  Jupiter is nearing the Aquarius – Capricornus border.

Saturn is dimmer than Jupiter, and 14.1° to the upper right of Jupiter.  The Ringed Wonder is slowly inching toward Theta Capricorni (θ Cap.)

Detailed Note: The moon is at its First Quarter phase at 1:59 a.m. CDT.  One hour before sunrise, Jupiter is over 13° above the east-southeast horizon.  In the starfield, Jupiter is 3.4° to the upper left of Deneb Algiedi, 0.5° to the lower left of μ Cap, and 2.6° to the upper right of ι Aqr.  Saturn – 14.1° to the upper right of Jupiter – is 1.5° to the upper right of θ Cap.  The Ringed Wonder is 18.0° up in the southeast.  Twenty minutes after sunset, brilliant Venus is nearly 2° above the west-northwest horizon as it makes its first evening appearance. An hour after sunset, Mars is about 40° up in the west, 5.0° to the upper right of ζ Tau. The Red Planet is 3.7° to the lower right of M35.  Use a binocular to see the star cluster.  The moon (9.0d, 58%) is nearly 70° up in the south-southwest.  It is between Pollux and Regulus (α Leo, m = 1.3), nearly 17° to the lower left of Pollux and 20° to the upper right of Regulus.  Even with the moon’s brightness, use a binocular to spot the Beehive star cluster (M44, NGC 2632), 3.9° to the lower right of the moon.

Read more about the planets during April 2021.

2021, December 28:  Venus Slips, Mercury Hops

December 28, 2021:  Brilliant Venus is quickly slipping from the evening sky.  Mercury appears beneath Venus after sunset.  This duo is joined by Jupiter and Saturn.  In the morning, Mars is near Antares and the moon near Spica.

2021, December 27:  Mars – Antares Conjunction

December 27, 2021:  The Red Planet Mars passes Antares this morning before sunrise.  At the same hour, the moon is near Spica.  The three bright planets – Venus, Saturn, and Jupiter – are in the evening sky.

2021, December 21:  Winter Solstice

December 21, 2021:  The winter solstice occurs at 9:59 a.m. CST.  Mars is in the morning sky along with a bright moon.  The planet pack – Venus, Jupiter, and Saturn – is in the southwestern sky after sunset.

2021, December 19-21:  Gemini Moon

December 19, 20, and 21, 2021:  The bright moon leading up to the winter solstice appears in the western sky before sunrise in front of Gemini.

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