2023, January 31: Morning Mercury, Three Evening Planets

January 31, 2023: Mercury is visible before sunrise in the southeastern sky. Venus, Jupiter and Mars are in the evening sky.  The moon is near the Bull’s horns.

Moon in the Bull's Horns. October 8, 2020
2020, October 8: Among the stars along the ecliptic, the gibbous moon, overexposed and behind the tree leaves, is 3.3° to the upper left of Zeta Tauri (ζ Tau), the Southern Horn of Taurus, and nearly 7° to the lower left of Elnath, the Northern Horn.

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by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 7:04 a.m. CST; Sunset, 5:04 p.m. CST.  Check local sources for sunrise and sunset times for your location.  Times are calculated from the U.S. Naval Observatory’s MICA computer program.

Jupiter’s Great Red Spot’s transit times, when it is in the center of the planet in the southern hemisphere: 5:16 UT, 15:11 UT; Feb. 1, 1:12 UT. Convert the time to your time zone. In the US, subtract five hours for EST, six hours for CST, and so on.  Use a telescope to see the spot.  Times are from Sky & Telescope magazine.

Today at month’s end, daylight is 10 hours.

Summaries of Current Sky Events

MARS OPPOSITION SUMMARY

SUMMARY FOR VENUS AS AN EVENING STAR

Here is today’s planet forecast:

Morning Sky

2023, January 31: Mercury is in the southeast before sunrise, to the lower left of Altair.
Chart Caption – 2023, January 31: Mercury is in the southeast before sunrise, to the lower left of Altair.

Mercury is in the southeastern sky before sunrise.  It is bright, but near the horizon, becoming more difficult to see each morning.  At 45 minutes before sunup, the solar system’s innermost planet is nearly 6° above the horizon and over 30° to the lower right of Altair that is about 20° up in the east.

Evening Sky

2023, January 31: Venus and Jupiter are in the west after sundown.
Chart Caption – 2023, January 31: Venus and Jupiter are in the west after sundown.

With Saturn’s departure from the evening sky, three bright planets are visible simultaneously after sunset.  The big show is in the southwestern sky with Venus and Jupiter.  The Evening Star is nearly 15° above the west-southwest horizon at 45 minutes after sundown.  It is 30° to the lower right of the Jovian Giant.

Venus is stepping eastward faster than Jupiter.  Venus overtakes the slower-moving planet on March 1st.  From February 20th through March 11th, the two planets are within 10° of each other.  This is a slow-moving, but very bright event, centered on conjunction evening.

2023, January 31: The moon is near Elnath after sunset with Mars nearby.
Chart Caption – 2023, January 31: The moon is near Elnath after sunset with Mars nearby.

Farther eastward, the bright moon, 81% illuminated, is over halfway up in the sky above the east-southeast horizon.  It is near Taurus’ northern horn, Elnath.

Mars is nearly 10° to the upper right of the lunar orb and 8.2° to the upper left of Aldebaran, Taurus’ brightest star.  The Red Planet passed the star last night and its eastward march continues. At 7:12 p.m. CST, Jupiter is nearly 30° above the west-southwest horizon and the Great Red Spot is at the center of the planet in the southern hemisphere through a telescope.  Sky watchers farther westward see the planet higher in the sky.

Jupiter
Jupiter (NASA Photo)

At 7:12 p.m. CST, Jupiter is nearly 30° above the west-southwest horizon and the Great Red Spot is at the center of the planet in the southern hemisphere through a telescope.  Sky watchers farther westward see the planet higher in the sky.

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