Questions tagged [telescope]

Questions related to the physical instruments for astronomical observations.

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2
votes
1answer
90 views

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 ...
3
votes
1answer
53 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 ...
28
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5answers
7k views

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 ...
2
votes
2answers
244 views

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 ...
1
vote
3answers
142 views

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 ...
6
votes
3answers
495 views

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 ...
4
votes
2answers
105 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 ...
4
votes
2answers
162 views

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 ...
2
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5answers
1k views

what can I see with this telescope?

I'm very new to astronomy and wondering what I can see with these specs, I honestly have no clue what a lot of these specs mean, and need help thanks. Features: Maximum magnification: 675x Large ...
5
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3answers
5k 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, ...
-1
votes
1answer
489 views

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 ...
3
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0answers
45 views

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 ...
6
votes
1answer
393 views

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 ...
2
votes
1answer
114 views

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 ...
2
votes
1answer
155 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 ...
2
votes
1answer
469 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?
2
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0answers
867 views

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 ...
2
votes
1answer
93 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 ...
6
votes
2answers
190 views

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. ...
3
votes
2answers
340 views

What's the difference between optical telescopes and solar telescopes?

Solar radiation is strong. Following problems for solar telescopes may be telescope site selection and temperature control. I wonder the telescopes themselves and their instruments are different?
1
vote
2answers
203 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 ...
4
votes
1answer
151 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 ...
37
votes
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 ...
4
votes
1answer
204 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 ...
3
votes
4answers
842 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 ...
5
votes
1answer
221 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 ...
8
votes
1answer
305 views

Is there a cosmic, rather than technological, upper limit to what a telescope can resolve?

Space radio interferometers could have a baseline of millions of kilometers, but is there a point where a larger baseline doesn't improve the resolution anymore because the photons observed are ...
4
votes
3answers
974 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?
4
votes
2answers
8k views

Equation to find distance between objective and eyepiece

I have a home made astronomical telescope with 100 cm objective lens and 5 cm eyepiece.when viewing an object in infinity the distance between eyepiece and objective is 105 cm. So how could I ...
5
votes
2answers
300 views

How do I find the RA of sunset and sunrise in a specific location?

I want to make some observations with a telescope in Hawaii on Mauna Kea but I am living somewhere else (not Hawaii) and I want to plan a night's viewing on the Hawaiian telescope. How do I find the ...
3
votes
2answers
162 views

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 ...
4
votes
3answers
180 views

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 ...
6
votes
2answers
1k views

How to align equatorial mount in the Southern Hemisphere?

I'm new to astronomy and recently got myself a telescope with an equatorial mount. I've found lots of resources online showing how to align the telescope but they all operate on the assumption that ...
1
vote
1answer
68 views

Focusing with Meade Audiostar

I recently upgraded from a Meade ETX-RA to and ETX-EC and bought a used Audiostar controller. My EC came with a Meade autofocuser and one of the old (I think it’s 494) controllers that has the focus ...
1
vote
2answers
6k views

what magnification is required to see jupiter, saturn, venus and mars with a 50mm refractor scope with f/12 ratio and 600mm focal lenth

i have a beginner telescope of 50mm and want to see planets it is arefractor with f/12 ratio and two eyepieces of 5mm and 10mm and i want to see mars, Jupiter, Saturn and venus. my max zoom ix 120x ...
5
votes
2answers
160 views

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 ...
1
vote
1answer
94 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 ...
4
votes
0answers
49 views

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 ...
1
vote
1answer
497 views

Replacing Meade ETX with computerized mount

I've been using a Meade ETX 90 for a few years now. Since it doesn't have the new computerized mount (with goto), I am looking into buying one to swap out. Where might I find this and is there a more ...
-3
votes
1answer
114 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.
3
votes
2answers
248 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 ...
2
votes
3answers
83 views

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'...
1
vote
3answers
1k 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 ...
3
votes
2answers
136 views

Can a telescope detect a blackbody?

I'd like to determine the distance at which a telescope with a certain set of parameters (sensitivity, collector area) can detect a blackbody with certain other parameters (temperature, emitting area)....
1
vote
1answer
460 views

How can I find out the maximum magnification of my telescope?

I have a Meade DS-2080AT-LNT. It's an inexpensive scope that I've had for several years. It has a couple of eyepieces with it, but nothing that will let you get a really good look at planets. I doubt ...
0
votes
2answers
99 views

Need help with telescope mount; stars have tails

If I take a shot longer than 20 seconds, the stars get a tail. I have a Celestron Advanced GT mount with starshoot autoguide scope. I use a cannon can on a 9" Celestron scope. I can't get a picture ...
2
votes
1answer
70 views

South or North Celestial Pole

I'm really confused with this one. Almost all documentation says you must start with your telescope pointing to the Celestial Pole and for the lucky ones who live in the north you can use Polaris. ...
5
votes
3answers
8k views

Do bigger telescopes equal better results?

There are many large reflecting/optical telescopes around the world, just to name a few: the Very Large Telescope, Large Zenith Telescope, and European Extremely Large Telescope. My question is does ...
3
votes
3answers
151 views

How are telescopes protected from blinding light and satellite glares?

I imagine a situation must happen sometimes where a telescope watching a very dark object may catch a bright flash of light or a reflection off of a satellite. If that's even a concern at all (maybe ...
1
vote
2answers
520 views

how to connect two eyepieces together with the x3 Barlow lens

how to connect two eyepieces together with the x3 Barlow lens I have 10mm,25mm, and x3 Barlow. Is there any way to connect them together to archive the maximum magnification of 105mm?

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