/r/Astronomy

Photograph via snooOG

The amateur hobby of humanity since the dawn of time and scientific study of celestial objects.

Everything to do with Astronomy

General Rules

For sub rules, please visit the redesigned reddit page.

"Astronomy compels the soul to look upward, and leads us from this world to another."

"We are a way for the cosmos to know itself."

Answers to Common Questions

How do I Become an Astronomer/What do Astronomers Do?

What telescope/accessories should I buy?

What should I look for in the sky?

What Was That Bright Moving Object I Saw?

Where Can I Learn About Astronomy?

Can I Get Help With Homework?

Sister Sub-Reddits

/r/Astronomy

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1

10x50 Binos OR 300mm f/4.5 lens with eyepieces?

Hello, I need to choose a better visual device and I own 2 different choices:

Nikon Aculon 10x50 binoculars

Tair-3S 300mm f/4.5 USSR old lens, with an adapter for astro cameras (can't remember the name) that I found out I can add eyepieces. I have Celestron X-cel 26mm and 9mm eyepieces (and a x2 barlow).

I know optically they are similar. The binoculars are f/5, probably have better modern coatings, are more portable than the other huge lens + eyepieces. On the other hand the Tair-3S gives me the option of 4 different FOVs (2 EPs + barlow), but also needs to be mounted on a tripod.

0 Comments
2024/02/12
10:54 UTC

2

Binoculars (15x70, or 20x80) or Beginner Telescope?

I am an avid astrophysics and astronomy reader, but recently, I am tempted to start seeing the sky with a pair of Astronomy Binoculars or get a basic telescope.

Here is Why I am Considering Binoculars

  • Portability
  • Ease of setup
  • They will be used due to the above two factors
  • I always travel with a tripod as I am a photographer as well, so using 15x70s or 20x80s is not an issue with a tripod
  • Wider field of view

Here's why I am worried with Binoculars

  • I always travel with a tripod as a photographer, so using 15x70s or 20x80s is okay with a tripod. Telescope.
  • Although these binoculars are mid-range expenses, they aren't very cheap either

Here's why I am considering a Telescope

  • It's a known that I'll see more deep space objects and better view of the planets

Here's what's my dilemna against getting a telescope

  • May not be used as much as a binocular
  • More expensive

I talked with a few local suppliers, and they straightaway said, " Do not buy binoculars. You will not see anything. " They recommend at least a starter telescope.

What would you all recommend? Will I actually not see much with a binocular or is it something that the local retailers are advising me against to push me into buying a Telescope?

6 Comments
2024/02/12
10:22 UTC

1

Texas, Good places to View Eclipse on April 8th?

Hey there! Not sure if this is the right sub but I figured here's a good place to ask. So, my family and I have a hotel room in San Marcos, TX as areas in and around Fredericksburg, TX were completely booked. Originally we were planning to go to Enchanted Rock State Park and view the eclipse from there but when I went to reserve a Day Pass it seems as though everybody has already reserved it. So, unless they'll still let us in to Enchanted Rock regardless, are there any other places y'all could suggest around the area out in the Hill Country that might be a good place to view? I'm not sure of any other state parks in the area or any other public places and I'd prefer we not have to stop on the side of the road for the event. Any help is seriously appreciated, thank you!

1 Comment
2024/02/12
06:48 UTC

2

Puzzling "meteor" shower 12 Feb Southern Hemisphere

12 Feb at about 0230hrs AEDT for about 10 minutes I watched this from about 35 degrees S.

in a very small patch of sky (about the size of my palm at arm's length) low SSE (well below the Southern Cross and diagonally down from it, about 2/3 of the way to the horizon.
numerous meteors of varying brightness and roughly satellite speeds
brightening then fading on a very short path.
all travelling roughly SE
Up to 3 visible at once, I stopped counting after a while but there were well over 20, not exactly parallel paths, but all roughly headed SE.

Actually, typing this, they can't have been meteors - pretty sure they were reflecting light, not burning up.

I've seen Starlink - those are usually all in a chain and all visible at once. These were only 1 to 3 visible at one time and not all on the same path and even following slightly different headings and variable brightnesses plus they were brightening and fading in a very short distance.

5 Comments
2024/02/12
03:19 UTC

120

Rosette Nebula

1 Comment
2024/02/11
23:02 UTC

81

The Weather Finally Permitted Me To Capture The Jellyfish Nebula in SHO.

1 Comment
2024/02/11
22:17 UTC

58

NGC 1788

1 Comment
2024/02/11
22:03 UTC

16

Why is the February Snow Moon a 'Micromoon'

0 Comments
2024/02/11
14:53 UTC

15

I have a question for all of you astronomers and astronomy adjacent:

We are in Hawaii on the big island facing west, and in the crescent moon this evening on the upper right hand side of the crescent both me and my friend see some sort of shadow, and I wondered if anyone could explain to me what that is, we are just looking with our naked eyes.

12 Comments
2024/02/11
05:00 UTC

54

IC2118 - The Witchhead Nebula

1 Comment
2024/02/11
02:59 UTC

168

My Favorite Saturn '23 + Live View Video

11 Comments
2024/02/11
01:58 UTC

567

M101 from my 44 year old telescope.

20 Comments
2024/02/11
00:03 UTC

1

Looking for info on the tilt of Saturn

I'm having a hard time finding a lot of info on the tilt of Saturn relative to Earth. I am looking for a list of dates when the Earth will be viewing the rings edge-on such as March next year, and when the planet will appear to be at full tilt with the rings most visible. I have seen the dates when we crossed the plane in the 90's and 2009 and the next time it will happen after this 2025 time, but I cant just find a chart of dates past those years, past and future. I was just curious of what the angle is now and the years the rings will be most visible next. Also I was looking for info on why the plane crossing can happen 1,2, or 3 times.

8 Comments
2024/02/10
22:39 UTC

45

The first SpaceX Dragon, departing the ISS into the void of space

1 Comment
2024/02/10
22:12 UTC

957

My best astrophoto yet..

19 Comments
2024/02/10
21:52 UTC

200

The Cygnus Region

12 Comments
2024/02/10
18:11 UTC

251

Starless Galaxy Discovered by Astronomers

26 Comments
2024/02/10
15:23 UTC

21

Exoplanets transits question

Forgive me if this has been done to death, but having searched a bit, I cannot find an answer:

Using the 'transit' method and dipping of observed light to infer exoplanets, what proportion of stars have orbital systems that lie perpendicular (as opposed to in the same plane) as our vantage point? Do all, or most, planetary system in our galaxy orbit at or near the same plane as the galactic plane? I think I read that our solar system orbits at some (small?) deviation from the galactic plane.

If time allowed, I'd also like to know about the bias that must be there in observing exoplanets that orbit very close to their star: observing Planet Earth, an ExoAstronomer would have to wait 365 (or is it 366?) days. Observing transits of the outer planets, including our gas giants would be a protracted endeavour.

Are there any teaching resources that specifically address these questions that you could point me to?

12 Comments
2024/02/10
08:33 UTC

130

NGC 4874

6 Comments
2024/02/09
22:39 UTC

108

M 42 (Orion’s Nebula)

3 Comments
2024/02/09
21:29 UTC

0

im so stupid

i thought a green ring i was seeing around a star was an atmosphere it was infact an nebula. also im kinda new to astromy

13 Comments
2024/02/09
20:48 UTC

43

Is there any high budget CGI of what happened to Jupiter in july 1994?

I mean high budget CGI like what's in the marvel or harry potter films. I'm talking about when fragments of Comet Shoemaker-Levy 9 collided with Jupiter in July 1994, penetrating deep into Jupiter's atmosphere, and the immense pressure and temperature within Jupiter's atmosphere caused the comet fragments to vaporize and explode.

9 Comments
2024/02/09
18:30 UTC

2

Past trajectory calculation and gravitational capture

Let's imagine we have a celestial body with a large mass like the sun or a planet, isolated enough in space (to minimize the effects of other celestial bodies) and an asteroid is captured by this celestial body and remains in a stable orbit.

Subsequently, by observing the movement of these two bodies over a period of time, is it possible by reversing the time in the calculations to find the moment when the asteroid "escapes" from gravity, or can this information be "lost"? Is there a connection with the entropy principle and the arrow of time?

2 Comments
2024/02/09
16:44 UTC

73

What are the most fascinating things in space to you?

The most fascinating thing to me is the size of the universe. The first next star, Proxima Centauri, is about 4.2 light years away, and theoretically if Voyager were to make that journey, it would take us about 70,000 years to reach our destination.

And where is the size of our galaxy, which is about 100,000 light years. Or the size of the visible or even invisible part of the cosmos.

I've read articles that say if the Sun is the size of a ping pong, our galaxy would be the size of the Earth to the Moon multiple by 200. Andromeda would be as far as the Earth to Saturn in real time.

97 Comments
2024/02/09
13:02 UTC

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