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Questions tagged [telescope]

Questions related to the physical instruments for astronomical observations.

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Nexstar 8SE trouble with sharp focus even watching distant trees

I have just received my Nexstar 8SE. Before planets, I have been trying to bring distant trees to sharp focus but to my disappointment, I am having subtle shades while watching tree edges. I tried to ...
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How can anyone analyse a planet using just some photons? [on hold]

I read the facts that there is a planet that is covered with burning ice and there is a planet where wind speed is 1000 times greater than that of earth and there is a planet in which depth of ocean ...
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1answer
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Array of telescopes with single orbiting collector?

Might such a thing give better images than we could get from other virtual telescopes with multiple collectors? Or is having multiple collectors not a limiting factor? Could a single collector ...
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Where exactly is the modification that first corrected the spherical aberration in Hubble's primary mirror?

The April 2015 CBS News article How NASA fixed Hubble's flawed vision - and reputation describes the modification taken to the Hubble Space Telescopes by the Space Shuttle that was used to correct for ...
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2answers
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What magnification is required to see detail on Mars / other local bodies?

I have a 125mm Jones Bird newtonian telescope (very shoddy) with 6x lens (2× + 3×) essentially we were able to see a very small O (yeah that's to scale) with varied shades of red. Is Mars far away ...
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1answer
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Type of telescope on Star Trek

In the first episode of Star Trek: Discovery, we learn that Captain Georgiou has an old-fashioned telescope in her ready room. Michael Burnham inherits it a bit later in the season. I wonder if anyone ...
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1answer
52 views

Is the Celestron astromaster 130 EQ Model able to see nebulas and galaxies?

Is the Celestron astromaster 130 EQ Model able to see nebulas and galaxies? If this telescope is not able to see nebulae, please suggest me the best one telescopes for nebulas.
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1answer
57 views

Is it possible to see an image with radio telescope of something not so far away in detail?

Can an image of a person using a radio telescope see a person from far away? Could a radio telescope be made to see someone walking on Mars? https://space.stackexchange.com/questions/30477/could-we-...
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74 views

Amateur observing

I'm new to this could someone tell me if I'd be able to see planets with the Celestron Cometron FirstScope described as below on argos.co.uk: A compact, easy to use and powerful 76mm reflector ...
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5answers
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Edu-Science telescope

I don't know much about astronomy, but my kids are asking for telescopes to view planets, stars etc. Could anyone tell me if this Eduscience telescope is any good? This kit contains a 40x with a ...
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1answer
37 views

Celestron Astromaster EQ130

I recently purchased a Celestron Astromaster EQ130 telescope and have absolutely no clue about telescopes but would love to learn. I have set this up but cannot even get a decent view of the moon, any ...
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5answers
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Is it possible to mount a telescope on a plane? Is it beneficial?

I was wondering if any planes had mounted telescopes with the intent to observe the stars. I understand that the atmosphere itself can warp and hinder incoming light and even completely obscure views ...
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2answers
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Upgrading telescope from 5“ to 8” or 10"?

I currently have Celestron Nexstar 130STL. I am trying to upgrade my telescope to next one. I examined Meade 8"ACF Goto telescope, but I was not too thrilled about it. It gave me better view, but ...
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1answer
89 views

Looking at ourselves with a powerful telescope?

Could a small curved mirror and/or lens in Earth's orbit be aimed at a different hemisphere from where you are be be viewed with a powerful telescope to see the ground through the mirror? Would a more ...
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1answer
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Need help with the calculations/conversion of a celestial object

I'm developing a telescope controller open-source application. I started this project with a very little knowledge of Astronomy. Basically, the app is going to send data to telescope over a wireless ...
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2answers
68 views

What are some good telescopes for a programmer? [closed]

I’ve never purchased a telescope and I was considering buying one. However, I wasn’t sure what to look for. I love to tinker and so a telescope that I can program with libraries such as SPICE would be ...
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3answers
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Eyepiece diameter for small focal length planetary viewing on a large dobsonian?

I have a 12" dobsonian with a 1500mm focal length and want to do some higher magnification planetary viewing. Currently my highest magnification is ~80x via my 19mm eyepiece (calculated here), but I ...
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0answers
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How does this telescope work, and what is it for?

Procrastinating, I clicked on a suggested video (How Large Can a Telescope Be?) and after about 01:20 I saw a clip of a telescope shown below. I was confused as I ...
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2answers
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Telescopes for beginner astrophotography

I'm a fairly experienced photographer and have enjoyed taking lots of photos of the night sky with my existing gear - wide angle starscapes over pretty hills, mostly. I'd like to move on, having ...
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3answers
214 views

What's the difference between a Newtonian telescope and a regular telescope

So, recently I was shopping for telescopes and I decided on the following telescope: https://www.amazon.com/Celestron-21049-127EQ-PowerSeeker-Telescope/dp/B0007UQNKY/ I had exactly $180 to spend, ...
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2answers
564 views

Which telescopes model is being shown to Albert Einstein in this file footage? What event might this be?

In the Economist video Why does time pass? there is some file footage of Albert Einstein attending some event where a model of a large telescope is on display, and being described to Prof. Einstein. ...
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1answer
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I am beginner here.Could any one please suggest telescope on AliExpress [closed]

I am beginner and eager to buy telescope for viewing planets and deep sky objects. I have gone though several posts here and found that only magnification is not so important but along magnification ...
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Things to be aware of when designing a custom equatorial fork mount

I'm still relatively new to amateur astronomy, and I would like to get into astrophotography. I've looked at different equatorial mounts, and I think I like the benefits of fork mounts. I'd like to ...
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1answer
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What is the meaning of “bright unresolved sources”

In many articles talking about telescopes, they talk often of "bright, unresolved sources". "bright" usually mean that the magnitude should be less than a certain threshold, (or that the signal to ...
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2answers
180 views

Why can’t I see any detail on planets?

I really want to know why I can’t see detail on planets. This summer my Dad and I went on a trip to Utah I went outside to look at the planets and couldn’t see detail on Mars, Saturn, and Jupiter. ...
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3answers
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Air temperature range recommendation for observations in a summer night with an entry level telescope?

Recent nights where I try to make my first observations with the entry levell telescope Seben with 114 mm mirror it seems that for lenses less than 6 mm details go lost due to warm air refraction (as ...
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1answer
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Can this mirror be cleaned?

I dug up my old 6" Dobsonian telescope from storage and the mirror looks like the following: The picture is down the tube, so you can see the spider holding the secondary. To my eye, the spots look ...
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1answer
42 views

First Telescope SkyWatcher Heritage 5" Tabletop Dobsonian Telescope

I have been star gazing for awhile with a pair of binoculars and now I am ready to step it up a bit and purchase a telescope. I have been looking at the SkyWatcher Heritage 5" Tabletop Dobsonian ...
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1answer
77 views

I have a Model 36050 telescope

My Model 36050 telescope came with the H6mm, H20mm and the green filtered moon lenses. It has a 360mm focal length and a 50mm diamiter. What can be seen with it?
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What is the highest resolution image of the moon taken from Earth's surface?

According to this article: https://www.theguardian.com/science/2018/jul/26/star-spotted-speeding-near-milky-way-black-hole-for-first-time the Very Large Telescope is "powerful enough to see a tennis ...
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1answer
46 views

Beginner looking for extra eyepieces for telescope

I have a Bushnell Voyager Reflector telescope. It came with 2 eyepieces: k4mm and k20mm. And I am trying to find additional eyepieces to zoom in further on planets and stars, but the bushnell website ...
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2answers
115 views

Struggling to use my new telescope

I recently got my first telescope, a Bushnell reflector telescope. I spent a good while setting up my alignment. And I can see the moon perfectly! I went to look at another, Mars. I got it aligned in ...
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131 views

Does the size of the atom limit the focal length of telescopes?

Does the size of the atom place a theoretical limit on a telescope's focal length (and thus, resolution)? It seems to me that that the allowed margin of error for parabolic mirrors drops with an ...
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Do we know at which angle the Event Horizon Telescope will look at the accretion disk of Sagittarius A*?

Do we know at which angle the Event Horizon Telescope will look at the accretion disk of Sagittarius A*? Additionally, would it matter if we are exactly in the plane with the accretion disk, i.e. ...
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1answer
119 views

Orion Skyquest xt8i Intelliscope Dobsonian Telescope Lens

I have the telescope in the title, which camps with 10mm and 25mm eyepieces. Both cannot really see anything in detail past the moon. All planets look like stars. What are good eyepieces for seeing ...
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4answers
8k views

Why are we building larger land-based telescopes instead of launching larger ones into space?

This question is a follow-up to Do bigger telescopes equal better results? How much bigger does a ground-based mirror have to be to match what a space-based one can do? I guess I'm asking primarily ...
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4answers
195 views

Is it practical to build a giant telescope in Moon? (Considering the fact that the atmosphere of moon is very rare)

China's FAST (Five-hundred-meter Aperture Spherical radio Telescope) is the largest radio telescope in the world.(This is huge!!!) As we all know Space Telescopes are better than Earth-Based ...
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1answer
91 views

How many galaxies can be seen in a given patch of sky

Similar to the question asked here, but my question is not about what can be seen with the naked eye but rather what might be seen if pointing my Newtonian reflector (full specs outlined below) at an ...
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1answer
61 views

Surface brightness of deep-sky objects and telescope specs

I'm new to amateur astronomy, and I recently acquired my first small telescope. I've just learned a bit about surface brightness after an unsuccessful night of trying to locate a few nebulae that were ...
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1answer
75 views

How to understand Kepler telescope under large aspherical wavefront

To my understanding, a Kepler telescope is designed to conjugate one plane to another. For example scale down/up the incoming wavefront onto a wavefront sensor for measurement. It works well for small ...
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3answers
306 views

Relation between angular resolution and aperture?

The angular resolution of a telescope is given by $\frac{1.22\lambda}{D}$. This should mean that the smaller the aperture D, the higher the angular resolution. But it is exactly the opposite - why?
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Why do we use solar filters instead of simply reducing aperture of the telescope?

Everywhere I read that to view the Sun in the telescope, one has to use a solar filter. The filter must be handled carefully to avoid any holes in it and even mustn't be stretched so as to avoid ...
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2answers
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Need help in creating telescope

I have 100cm F.L objective and 10cm F.L eyepiece 10cm in diameter and double convex both. what are the planetary objects I can see with telescope made with these lenses. I also have a double convex ...
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2answers
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Names of specific galaxies in Hubble's XDF

I'm working on a little side project that traces and identifies galaxies in Hubble's XDF using OpenCV. This is my current progress with tracing the more prominent galaxies: I was wondering if there ...
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1answer
43 views

Best locations for large telescopes at high northern latitudes

Large optical telescopes want to be located at high altitude (get above as much of the atmosphere as possible). I get the impression that there is also a preference for low latitude (see as much of ...
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0answers
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Meade LX200GPS electronic RA movement very slow

I use a Meade 200 LX GPS. Last night between viewings it was placed in Sleep mode. On return the scope was making noises as if the motor was running. The scope was stationary, but had moved to what ...
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2answers
204 views

My first pictures of Jupiter

Well, I'll start off by saying I am certain I am doing it wrong! Now that I got that out of the way here is my image: I have a feeling I can't see the planet because I need a filter to block out the ...
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3answers
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How do I obtain the brightness of a star in the night sky?

I am planning to conduct a research which involves observing the brightness of a star. So far, I haven't been able to obtain much information as to how I may go forward with the observation process. I'...
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1answer
102 views

About bigger resolution of telescopes [closed]

Any idea about the design of new better telescope having small length of diameter and having more resolving power.
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3answers
198 views

Photographing Venus with a phone through a telescope

I took a picture of Venus through my telescope (Celestron Astromaster 130eq) using a 10mm lens with a Barlow lens. The picture isn't really good since I took it with my phone and I still don't have a ...