Astronomy Observers Journal

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[Astronomy Observers Journal @AstroObsJournal]

Formulas for Instruments: Exit Pupil:

Ep = Do ÷ M
Ep = Ef ÷ Fn

(Ep = exit pupil, Do = objective diameter in mm,
M = magnification, Ef = eyepiece focal length in mm,
Fn = objective f/number)

Exit Pupil is the diameter of the circle of light that hits the observer’s eye when looking through an eyepiece. If the exit pupil diameter is greater than the observer’s pupil, usually ~7mm, the observer’s eye likely will not see all the light coming from the eyepiece. In such a case the observer may want to consider using a higher magnification. The formulas detailed provide a solution based on either diameter and magnification or focal length and f/number, respectively.

[Damian Peach🔭🪐 @peachastro]

Jupiter with GRS and three moons on May 1st

Before the drawing i spent about 40mins imaging the planet. Seeing was very good at times. Europa at left with Ganymede and Io at right. Ganymede's shadow is cast onto the planet.

This is likely my final image of this apparition as the planet is now getting low in the evening twilight. After 52 nights of imaging and my 28th straight apparition imaging the planet it was a great note to end on.

[Latest in space @latestinspace]

🚨 Vesta, one of the biggest asteroids in our solar system, will be at its brightest of the entire year TONIGHT

Look toward the constellation Libra after sunset to spot it

[Elon Musk @elonmusk]

I love giant machines

[Black Hole @konstructivizm]

Messier 101 - The Pinwheel Galaxy A spiral galaxy in the constellation Ursa Major, located approximately 22 million light-years away.

[Amazing Physics @amazing_physics]

classy shot from Artemis II so far—absolutely stunning

[Curiosity @MAstronomers]

The storm of 800 billion stars.

The light in this photograph is 28 million years old.

It left this galaxy before humans existed.

It crossed unimaginable distances in cold silence — for 28 million years — to end its journey hitting a telescope we built.

Just so you could scroll past it on your phone.

Try to feel that for a second.

[Elon Musk @elonmusk]

Yes

[AstroBin.com @AstroBin_com]

Image of M3, shared on AstroBin by Detlef Scholz, who used a telescope from AstroBin sponsor @TeleskopService: TS-Optics 300mm/12" f/6.4 Ritchey-Chrétien Astrograph (truss).
More: https://t.co/Vv5CY8Yq0d
Image: https://t.co/2BKbYtvvCn
Integration: 8h 7′
Thanks for looking!
S.

[Amazing Physics @amazing_physics]

Are we Alone?

[Science & Nature @Sci_Nature0]

Extremely rare “White Auroras” have been spotted over Norway—and the sky put on a show few people ever get to witness.
Photographers out chasing the northern lights expected the usual waves of green and purple. Instead, they were stunned by something far rarer: ghostly white auroras stretching across the sky.
Soft. Pale. Almost glowing.
It’s one of the rarest aurora displays on Earth.
Scientists explain that white auroras occur when multiple aurora colors strike the human eye at once, blending together until they appear nearly colorless. With so many wavelengths firing simultaneously, the brain can no longer separate them—so it perceives white.
Most aurora hunters spend their entire lives without ever seeing it. This time, Norway delivered the extraordinary.
Cameras across the Arctic captured the eerie light spilling through the darkness like frozen lightning, leaving even experienced skywatchers in awe.
Some described it as otherworldly. Others said it looked like the sky itself was glowing from within.
And for a few unforgettable moments, the heavens above Norway became something almost impossible to believe.

[Amazing Physics @amazing_physics]

What would be the most terrifying discovery we could make on Mars?

[Chuck's Astrophotography @chucksastropho1]

My latest capture - the Needle Galaxy (NGC 4565). It's one of the brightest examples of an edge-on galaxy. It's around 38 million light-years from Earth. I used my Celestron RASA telescope, ZWO ASI533MC color camera, and an Antlia L-Filter from Starfront Observatories, TX.

[AstroBin.com @AstroBin_com]

AstroBin's Image of the Day: "Hewett 1 - The Giant in Sextans" by Bray Falls - https://t.co/4oIJzSC5cE

#astrophotography

[Curiosity @MAstronomers]

The Moon from the International Space Station, through Earth's blue skies.

[Black Hole @konstructivizm]

View of the moon Phobos from the surface of Mars.
NASA

[Andrew McCarthy @AJamesMcCarthy]

These are coronal loops that form following large solar flares. I captured these last year, but there’s similar ones present on the solar limb right now. Great time to observe if you can do so safely!

If I get a break in the clouds I’ll bring you real-time footage.

[Jasmine 🌌🔭 @astro_jaz]

NEW JWST IMAGE OF A BEAUTIFUL EINSTEIN RING

[Space 8K @uhd2020]

Andromeda

[Black Hole @konstructivizm]

A snow filled crater on Mars
NASA