Jupiter and Io

Minnesota Skies: April 2020

Your local guide to observing celestial objects and events

Published03/31/2020 , by Deane Morrison, Thaddeus LaCoursiere & Sarah Komperud

By Deane Morrison

April opens with spectacular views of planets in both the morning and evening skies. Early risers who look to the southeast will see Jupiter, brilliant in the predawn darkness. Off to the east of Jupiter, red Mars hangs right below golden Saturn.

But this closeness doesn’t last. The very next day, it will be obvious that Saturn has moved away from Mars. In fact, both Saturn and Jupiter are heading westward, away from the red planet. On the 9th, Saturn will be almost exactly midway between Mars, to the left, and Jupiter. By month’s end, the gap between Mars and Saturn will have opened to nearly 20 degrees.

While Saturn and Jupiter are pulling away from Mars, Earth is moving closer. During April the distance to Mars drops from 135 million miles to 114 million miles. Also, Jupiter is slowly drifting closer to Saturn. In December these two planets make a very close pass.

In the evening sky, Venus visits the lovely Pleiades star cluster. On the 1st, the cluster hovers close above the queen of planets. The next night, Venus has arrived at the border, and on the 3rd the planet appears to be another star in the cluster. On the 4th, Venus is above the Pleiades, and from then on the two objects rapidly separate. The one wrinkle is the bright waxing moon that shines those nights, so keep your binoculars handy.

And if that weren’t enough, April’s full moon is one of the closer ones this year and qualifies as a “supermoon.” It rises the evening of the 7th, looking not only bigger and brighter than usual, but very round because it’ll be only a couple of hours or so from the moment of perfect fullness. Also, have a look on the 25th, when a young crescent moon of the next cycle appears below Venus and next to Aldebaran, the eye of Taurus, the bull.

April ends with an astronomically based holiday that the ancient Celts (and many contemporary ones) called Beltane. It was celebrated on May 1, which began formally at sundown April 30 and was one of four “cross-quarter” days falling midway between an equinox and a solstice. The night of April 30 was when evil spirits that had been wreaking havoc since Halloween—another cross-quarter day—had a last fling. At dawn on May 1, they had to begin their annual six-month exile from the world of humans. Beltane was, and is, a celebration of the coming summer and hopes for an abundant harvest.

Sky-lights

April 1 and throughout the month
Looking to the southeast Mars, Jupiter, and Saturn form a line in the early morning sky, around 5 am. All three will be present in the dawn sky throughout the month, with Mars moving further and further away from Saturn throughout the month.

April 14
Algol, the Demon Star, in the constellation of Perseus,will be at minimum brightness for roughly two hours starting around 8:00 pm CDT, but won’t be visible until after sunset. Look for it low to the northwest starting around 9 pm.

April 16–26
Happening mid- to late-April, the Lyrid meteor shower peaks in the early morning hours of April 22. With a new Moon on the 23, the last week of the Lyrids should be great for early risers.  Although nothing is guaranteed with meteor showers, the Lyrids have been known to produce split-second fireballs, so head outside to try to catch one! 

April 26
Look for the waxing crescent Moon between the horns of Taurus at around 9:30 pm CDT. The Moon will be a few finger widths down and to the left of Beta (β) Tauri, which will form a triangle with the Moon and Venus.  Look for Venus almost a full hand-width to the right of the Moon.

Moon Phases

April 1—First Quarter Moon
The Moon is one quarter of its way through its orbit around the Earth, which makes half the Moon illuminated and half dark from our perspective.

April 8—Full Moon
The Moon is located on the opposite side of the Earth as the Sun and the side we see is fully illuminated.

April 14—Last Quarter Moon
This phase occurs when the Moon is three-quarters of the way through its orbit around the Earth.

April 23—New Moon
The Moon is located on the same side of the Earth as the Sun and is not visible in the night sky. This is the best time of the month to observe faint objects like galaxies and star clusters because there is no moonlight to interfere.

April 30—First Quarter Moon
The Moon is one quarter of its way through its orbit around the Earth, which makes half the Moon illuminated and half dark from our perspective.