2021, March 5: Moon, Antares, 3 Morning Planets

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2021, March 5: An hour before sunrise, the gibbous moon is 5.0° to the upper right of Antares.

March 5, 2021: About an hour before sunrise, find the slightly gibbous moon to the upper right of the star Antares in the southern sky.  The morning triple dip of planets – Jupiter, Mercury, and Saturn – is low in the east-southeast before sunrise.  Mercury passes Jupiter this morning.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:19 a.m. CST; Sunset, 5:46 p.m. CST.  Check local sources for sunrise and sunset times for your location.

This morning, the slightly gibbous moon is in the southern sky during morning twilight. (The moon reaches its Last Quarter phase at 7:30 p.m. CST this evening.)  The moon is 5.0° to the upper right of Antares (“the rival of Mars”), the brightest star in Scorpius.  Note that the lunar orb is 4.2° to the lower left of Graffias (“the crab”).  Use a binocular to see the starfield behind the moon.

2021, March 5: Jupiter, Mercury, and Saturn are visible during bright morning twilight in the east-southeast. Jupiter is about 5° up in the east-southeast, with Mercury 0.3° to its upper left. The Jupiter – Saturn gap is 8.6°.

Three planets are visible during bright twilight.  The brightest is Jupiter.  Thirty minutes before sunrise use a binocular to find it about 5° in altitude in the east-southeast.  Mercury passes the Jovian Giant this morning.  This speedy planet is 0.3° to the upper left of Jupiter. 

Saturn is 8.6° to the upper right of Jupiter, more than a binocular field away.  To find Saturn, put Jupiter at the lower left of the field, then move the binocular slightly to the upper right.  Saturn will appear in the view.

Detailed Note: One hour before sunrise, the moon (21.7d, 57%) is 26° up in the south, 5.0° to the upper right of Antares (α Sco, m = 1.0) and 4.2° to the lower left of Graffias (β Sco, m = 2.5).  Use a binocular to see the starfield behind the moon. Fifteen minutes later, Saturn is nearly 7° up in the east-southeast.  Jupiter is 8.6° of ecliptic longitude east of Saturn.  With a clear horizon, you might find Jupiter very low in the sky.  Thirty minutes before sunrise, use a binocular to locate Jupiter about 5° up in the east-southeast, with Mercury 0.3° to its upper left.  One hour after sunset, Mars is nearly 60° up in the west-southwest.  It is 2.8° to the left of Alcyone.  With a binocular spot 37 Tauri (37 Tau, m = 4.3), 2.6° to the upper left of Mars. The moon is at its Last Quarter phase at 7:30 p.m. CST.

Read more about the planets during March 2021.

2021, July 6: Venus, Mars Final Approach

July 6, 2021:  In less than a week, brilliant Venus passes Mars in the west-northwestern sky after sunset.  This evening the two planets are 3.8° apart.  Venus is over 18° to the lower right of the star Regulus.

2021, July 1- 7, Morning Moon

July 1 – July 7, 2021, the waning crescent appears in the eastern sky.  Early in the viewing period, the moon is among the dim stars of Pisces.  As the week progresses, the moon wanes and moves farther eastward, appearing near Taurus.

2021, July 5: Earth at Aphelion

July 5, 2021:  Our planet Earth reaches its farthest point in its yearly trek around the sun.  Our seasons are not related to Earth’s distance from the sun.  Coincidentally, the moon is at its farthest point from Earth today.

2021, July 4: Venus Aims at Mars

July 4, 2021: The Venus – Mars conjunction is eight days away.  This evening Venus moves to within 5° of the Red Planet.



Categories: Astronomy, Sky Watching

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