Solar System Gets its Ducks in a Row – Sky & Telescope

Dawn planet line


All five bright planets fan out in order of their distance from the Sun across the dawn sky now through early July. One of the prettiest mornings to view them will be June 24th, when a striking crescent Moon joins the crew. You can start earlier — 60 to 90 minutes before sunrise — to spot Mars, Jupiter and Saturn. To add Venus and Mercury, which nestle low in the solar glow, you’ll need to observe closer to sunrise. Use this sunrise calculator to plan your outing. As the Moon passes through, we’ll see successive conjunctions or appulses. The Moon appears near Jupiter on June 21st; Mars on June 22nd, Venus on June 26th, and Mercury on June 27th.
Sky & Telescope graphics

Like a peacock spreading its feathers, the solar system’s five brightest planets will fan out in a beautiful display at dawn through early July. Even more amazing, they’ll be in correct order outward from the Sun starting with Mercury at the eastern horizon followed by Venus, Mars, Jupiter, and ending at Saturn. Standing under the spread will feel like looking out the window of spaceship Earth at our place in the cosmic order.

1921 planet line
The most compact line of planets in order of distance in more than a century occurred in November 1921 when they spanned an arc just 44° long. During the present day lineup the planets were closest at 91° on June 3rd, but Mercury wasn’t visible visually at that time because it was too faint (magnitude 2.3).
Stellarium

This rare event last occurred in the morning sky in December 2004. Turning to the evening sky, we saw similar planet lines in October 1997 and September 1995, but Mercury’s elongation at those times was no more than 10°, restricting the view to sharp- eyed observers in tropical latitudes. For US skywatchers the last similar grand spread took place in July 1957. Yikes, I was barely four years old!

best dates

I encourage you to get up early at least one morning for a look. Invite friends. Bring the kids. There will be multiple opportunities for viewing, but the two choicest opportunities occur on June 24 (described above) and June 26, when Venus and the filament-thin Moon meet in conjunction. While it’s not a once-in-a-lifetime event, the next opportunity won’t be till March 2041. Call me impatient, but I’m not making any assumptions about the future.

Planets portrait
Meet the celebrities. Efrain Morales of Puerto Rico created this group portrait of the planets, including the Sun, taken through his telescope. Yes, Uranus and Neptune will also be there — more details below.
Efrain Morales

The alignment is essentially a naked-eye event — the only requirements are clear to partly cloudy skies and an unobstructed east-northeastern horizon. That said, I strongly recommend you bring a pair of binoculars to help in digging out Mercury, which will hover low in the solar glow just a few degrees above the horizon for mid-northern and mid-southern latitude observers. Assuming an open view and haze-free air I think you’ll see Mercury without optical aid. But a backup glass will guarantee you won’t be shorted a planet. The other four will be much easier to spot.

Planets June 17
I took this photo from the Lake Superior shoreline in Duluth, Minnesota, at 4:15 am Friday, June 17th. Four planets are visible with Mercury a bit too low to show through the horizon haze. Its visibility should improve in the coming week. Details: 16-mm lens, full-frame sensor.
Bob King

You’ll want to be outside a little early to get oriented and find a comfortable place to settle in for a view. An hour and 15 minutes before local sunrise is perfect. A lake, farmer’s field, or a high lookout point with an unobstructed east-northeastern horizon makes an ideal location. Venus will be bright and low, with Mercury on the verge of rising at that time. All five planets will be best visible, depending on your latitude, from about 1 hour to 40 minutes before sunrise. Since that time is critical to planning, use this sunrise calculator to find out when the Sun comes up for your location.

Solar system June 24, 2022
In this godlike view looking down from above Earth’s North Pole, you can see how the planets fan out across the solar system on June 24.
JPL HORIZONS with additions by Bob King

Photo tips

Since many of us will want to photograph the span, you may want to do advance reconnaissance to include suitable foreground scenery. On June 20th, the pack extends across about 102° of sky, increasing to 116° by month’s end. For a full-frame DSLR camera, you’ll need at least a 12- to 14-mm lens — with horizontal fields of view of 104° to 112°, respectively — to squeeze them all in. Cropped sensor cameras require even shorter focal lengths. Since these lenses don’t come cheap, a better alternative would be to take several photos of the scene with a standard lens and combine them into a single image using an imaging program like Paint (packaged with Windows 10/11), Mac OS Photos , or Photoshop. Check YouTube for videos showing how it’s done.

Your creative hand will also be needed during post-processing because of the wide difference in lighting between the darker southern sky, where Mars, Jupiter and Saturn reside, and the bright belly of the eastern horizon, where the inner planets hide.

All planets by size
This map-diagram shows all the planets (except the Moon) according to relative size and their appearance in a small telescope on June 24, 2022.
Stellarium with additions by Bob King

See every planet

Don’t forget to include Earth in the lineup! You can do this by using the waning Moon as a proxy. Or just look around and admire the landscape. If you’re a completist, you’ll want to also search for Uranus and Neptune. They’re up there, too, even if they screw up the order. Both are visible in either binoculars or a small telescope. And while we’re at it let’s include 4 Vesta, a representative of the main asteroid belt. Maps below provide the positions of these three additional objects.

How beautifully these five tiny lights demonstrate the essential flatness of the solar system. Looking up, you can practically see the ecliptic etched into the sky. When pointed out, even a neophyte will quickly grasp the “shape” of our neighborhood and Earth’s place within it. And while flat Earthers will argue you to death about the sphericity of our planet or lack thereof, at least we can all agree this month that the solar system is as flat as a thin crust pizza.

Vesta locator
Vesta, shining at magnitude 6.7, hangs out in Aquarius near Tau (τ) Aquarii between Saturn and Jupiter. North is up in all charts. Stars are shown at magnitude 7.5.
Stellarium with additions by Bob King
Neptune locator
Neptune barely budgets during the viewing period because it’s stationary on June 28th. Stars at magnitude 8.5.
Stellarium with additions by Bob King
Uranus locator
Uranus lodges in Aries just above the head of Cetus at magnitude 5.8. It also moves slowly and will be easy to keep track of. Stars shown at magnitude 6.5.
Stellarium with additions by Bob King

Read more about this and other celestial events this month in the June 2022 issue of Sky & Telescope.


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