APOD: When Z is for Mars (2023 Apr 15)

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APOD Robot
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APOD: When Z is for Mars (2023 Apr 15)

Post by APOD Robot » Sat Apr 15, 2023 4:06 am

Image When Z is for Mars

Explanation: A composite of images captured about a week apart from mid August 2022 through late March 2023, this series traces the retrograde motion of ruddy-colored Mars. Progressing from lower right to upper left Mars makes a Z-shaped path as it wanders past the Pleiades and Hyades star clusters, through the constellation Taurus in planet Earth's night sky. Seen about every two years, Mars doesn't actually reverse the direction of its orbit to trace out the Z-shape though. Instead, the apparent backwards or retrograde motion with respect to the background stars is a reflection of the orbital motion of Earth itself. Retrograde motion can be seen each time Earth overtakes and laps planets orbiting farther from the Sun, the Earth moving more rapidly through its own relatively close-in orbit. High in northern hemisphere skies the Red Planet was opposite the Sun and at its closest and brightest on December 8, near the center of the frame. Seen close to Mars, a popular visitor to the inner Solar System, comet ZTF (C/2022 E3), was also captured on two dates, February 10 and February 16.

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orin stepanek
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Re: APOD: When Z is for Mars (2023 Apr 15)

Post by orin stepanek » Sat Apr 15, 2023 2:59 pm

We had this subject Once befor; but today's photo is a lot nicer! :lol2:
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Smile today; tomorrow's another day!

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Re: APOD: When Z is for Mars (2023 Apr 15)

Post by canopia » Sat Apr 15, 2023 4:08 pm

Yes, actually quite a few times before, thanks Orin. :)

Tunç Tezel
orin stepanek wrote: Sat Apr 15, 2023 2:59 pm We had this subject Once befor; but today's photo is a lot nicer! :lol2: