2024, July 29: Pretty Moon-Pleiades Conjunction

July 29, 2024: Before sunrise, look for a Moon-Pleiades conjunction.  The planet Uranus is nearby and in the same binocular field of view.

The crescent moon, Venus, Aldebaran and the Pleiades, July 17, 2020.
2020, July 17: The crescent moon is in a group with Venus and Aldebaran as the Pleiades appear above the scene during early morning twilight.

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by Jeffrey L. Hunt

Chicago, Illinois: Sunrise, 5:42 a.m. CDT; Sunset, 8:12 p.m. CDT.  Check local sources for sunrise and sunset times. Times are calculated by the US Naval Observatory’s MICA computer program.

Here is today’s planet forecast:

Morning Sky

Moon-Pleiades Conjunction

Moon Pleiades conjunction
Chart Caption – 2024, July 29: Bright Jupiter, Mars, and the crescent moon are with bright stars in the eastern sky before sunrise.

An hour before sunrise, step outside to look for the crescent moon, 36% illuminated, over halfway up in the sky in the east-southeast.  The moonlight is bright enough to illuminate the ground, casting shadows, while washing out the dimmer stars.

Moon Pleiades conjunction
Chart Caption – 2024, July 29: Through a binocular the moon fits tightly into the same field with Uranus and the Pleiades star cluster.

The Pleiades star cluster, part of Taurus, is 6.7° to the lunar orb’s lower left.  The star cluster and lunar crescent fit tightly into a binocular field, with the moon to the upper right and the stellar collection’s brightest stars to the lower left.

Planet Uranus is in the same field of view to the lower right.  Once you marvel at the moon and star cluster, locate the stars 13 Tauri (13 Tau on the chart) and 14 Tauri (14 Tau).  They are nearly the same brightness as Uranus.  Move the binocular slightly so they are near the center of the field, to the aquamarine planet’s lower left.

Mars and Hyades

Jupiter Mars in Taurus
Chart Caption – 2024, July 28-August 4: Through a binocular, Mars moves through the same field with Aldebaran and the Hyades star cluster.

Mars, 7.2° to the Pleiades lower left, is marching eastward in front of Taurus toward a conjunction with Jupiter next month.  The Red Planet appears in the same binocular field with Aldebaran, the Bull’s brightest star, and the Hyades star cluster.

Jupiter

Jupiter' Great Red Spot
Photo Caption – Jupiter (NASA Photo)

Bright Jupiter is over 30° above the eastern horizon, 8.1° to Mars’ lower left, and 6.1° to Aldebaran’s upper left.  It is the brightest starlike body in the sky this morning, nearly 10 times brighter than Capella, the bright star about 25° to its upper left.

Orion

September 9, 2022: Orion, Sirius, and Procyon are in the southeast before sunrise.
Photo Caption – September 9, 2022: Orion, Sirius, and Procyon are in the southeast before sunrise.

Below the planets and the moon, Orion the Hunter continues its climb into the morning sky.  Its brightest stars, Bellatrix, Betelgeuse, and Rigel are easily visible from a view with a clear horizon.  While the Hunter’s three belt stars are higher each morning, use a binocular to see them.

Saturn

2024, July 29: Saturn is in the south-southwest before sunrise.
Chart Caption – 2024, July 29: Saturn is in the south-southwest before sunrise.

Saturn is visible at this hour, less than halfway up in the south-southwest.  It is in front of an Aquarius’ dim starfield.

Saturn Retrogrades
Chart Caption – 2024, June 30: Saturn appears to move westward against the stars until November 15th.

The planet is retrograding, an illusion as Earth overtakes the more-distant planet.  The line of sight from Earth to the outer planetary bodies normally moves eastward against the distant starfield.  As Earth catches the planet, the line of sight shifts westward, making the planet appear to back up compared to the stars.

Saturn retrogrades, 2024
Chart Caption – 2024: Saturn retrogrades through a single binocular field of view in front of Aquarius during 2024.

The planet’s entire retrograde motion is visible through a binocular.  Earth passes between Saturn and the sun during early September.  The line of sight shifts eastward again during November.

Evening Sky

Mercury and Venus

Venus and Mercury in the east-northeast during morning twilight.
Photo Caption – Venus and Mercury in the east-northeast during morning twilight.

Mercury and Venus are hidden by bright evening twilight.  They set at nearly the same time, around 50 minutes after sundown.

Mercury is moving toward a morning appearance during early September, passing between Earth and Sun next month.

Venus is slowly making its way into the western sky after nightfall as the Evening Star.  Its first appearance is affected by the low angle the solar system makes with the western horizon after sunset.  While the planet is 15° from the sun, it is only 8° above the horizon at sunset, the effects of this low angle.  The planet’s visibility suffers from this poor angle until mid-November, when it sets after the end of evening twilight.  By early January 2025, it sets four hours after the sun, gaining 150 minutes of setting time during a short interval.

Begin looking for Venus with a binocular in two evenings at 30 minutes after sundown.

Saturn After Nightfall

2024, July 29: At three hours after sunset, Saturn is in the east-southeast.
Chart Caption – 2024, July 29: At three hours after sunset, Saturn is in the east-southeast.

Saturn rises less than two hours after nightfall.  An hour later, the Ringed Wonder is less than 15° above the east-southeast horizon. 

Tomorrow morning it is again in the south-southwestern sky.  The waning crescent moon is near Mars.

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