2021, April 18: Jupiter, Saturn, Morning Planets


April 18, 2021: The bright morning planets, Jupiter and Saturn, are in the southeastern sky before sunrise.  Capricornus is the starry background for this giant planet duo.  Daylight is 13 hours, 30 minutes long.

Chart Caption – 2021, April 18: The morning planets, Jupiter and Saturn, are in the southeast before sunrise, in front of the stars of Capricornus.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:05 a.m. CDT; Sunset, 7:35 p.m. CDT.  Check local sources for sunrise and sunset times for your location.

The length of daylight has stretched to 13 hours, 30 minutes. Daylight continues to grow 2-3 minutes each day and another 31 minutes by month’s end.

Bright morning planets, Jupiter and Saturn, are in the southeast before sunrise.  One hour before sunup, Saturn is over 17° in altitude above the southeast horizon.  The planet seems to move very slowly compared to the starry background.  This morning it is 1.6° to the upper right of the star Theta Capricorni (θ Cap on the chart).  Use a binocular to see the starry background with the morning planets.

Bright Jupiter – the brightest “star” in the region – is nearly 14° to the lower left of Saturn. The Jovian Giant rises 2.3 hours before sunrise.

In the starfield, Jupiter is 3.2° to the upper left of Deneb Algiedi, “the kid’s tail,” (δ Cap) and 0.2° to the lower left of Mu Capricorni (μ Cap).

During the last three mornings, Mu Capricorni has seemed to intermingle with Jupiter’s moons in a telescope eyepiece.  The star is over a million times farther away than Jupiter, but along the same line of sight.

This morning Jupiter and the star are still in the eyepiece of a low-power spotting scope or telescope, although they are near opposite edges.

Detailed Note: One hour before sunrise, Jupiter is nearly 13° in altitude above the east-southeast horizon.  It is 3.2° to the upper left of Deneb Algiedi and 0.2° to the lower left of μ Cap.  Saturn is 13.9° to the upper right of Jupiter and 1.6° to the upper right of θ Cap.  One hour after sunset, the moon (7.0d, 38%) is nearly two-thirds of the way up in the west-southwest, among the stars of Gemini, 9.5° to the lower right of Pollux (β Gem, m = 1.2). Use a binocular to spot Wasat (“the middle of the sky,” δ Gem, m = 3.5) 4.8° to the upper left of the crescent and Mebsuta (‘the outstretched paw of the lion,” ε Gem, m =3.0) 4.6° to the moon’s lower right.  Mars – nearly 18° to the moon’s lower right – is above the horns of Taurus, 4.3° to the upper right of ζ Tau.  Mercury is at superior conjunction at 8:49 p.m. CDT.

Read more about the planets during April 2021.

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.

2021, July 24: Four Evening Planets, Moon

July 24, 2021: After sunset, Venus and Mars are in the western sky.  A little later during evening hours, the moon is near Jupiter and Saturn in the southeast.

2021, July 29: Jupiter – Mars Opposition

July 29, 2021:  Jupiter and Mars are 180° apart along the ecliptic.  Dim Mars sets in the west-northwest as Jupiter rises in the east-southeast.  This event signals that soon both appear in the sky simultaneously.

Categories: Astronomy, Sky Watching

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