Questions tagged [photography]

Questions about photography of celestial objects by amateur or professional astronomers. Questions about photography of other objects are off-topic but might be asked on our sister site Photography Stack Exchange.

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1answer
1k views

Why shouldn't you look at the Sun through a camera using eclipse glasses?

One of the NASA approved eclipse glasses manufacturers has the following warning on one of their eclipse glasses: Do NOT look through a camera, telescope or binoculars with ANY eclipse shades on! ...
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1answer
98 views

Night sky timelapse - SO MANY METEORS?

I have really little knowledge of Astronomy in general. Last Monday, I tested my new camera by doing a Night-Sky timelapse. After a little post-processing, i noticed dozens of light streaks going in ...
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How does the Hubble telescope capture long-exposure photos?

I recently learned (if I understood correctly) that the famous Ultra Deep Field photo(s) required something like a 10-day exposure on a very tiny piece of the sky to achieve. How can this occur when ...
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242 views

Planning to revisit Arthur Eddington's experiment from 1919

As the fateful day draws closer, the United States will host a celestial event that comes once in three generations. I plan to witness this first hand at the exact center of greatest eclipse. In the ...
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1answer
988 views

Cooling of astrophotography camera sensor chip

For astrophotography using 'medium size' land telescope at good location, How many time longer exposure, in view of boosting the system's ability to photograph even darker objects, can one gets from ...
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1answer
280 views

What type of camera instruments are used to record optical images in space telescopes like HUBBLE & JWST.?

I am just curious about photos taken by space telescopes What kind of type of camera systems are used in space telescopes like HUBBLE and JWST? Are those cameras systems specially built for that ...
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336 views

Good ways to safely view an Eclipse?

August 21 is going to see a total eclipse across most of the US, and I'm planning a trip to what I hope is an ideal viewing location. What are good ways to safely view the eclipse? I don't want to ...
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2answers
1k views

Algorithm to stack astronomical images

I'm looking for a simple algorithm to compare astronomical images (of the same sky region) against each other, compute their movement and rotation, to finally stack them. At the moment I'm already ...
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1answer
232 views

Image processing techniques to distinguish between stars and galaxies in an image? [closed]

Say I have an arbitary image of stars and galaxies without any extra information (no other spectra info other than image itself). Can you help me distinguish them? Are there any specific features / ...
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1answer
109 views

I want a galaxy count database, also how do I use SDSS skyserver to fetch galaxies?

I'm new to all this and trying to implement galaxy counting. For the initial stage I need raw image data, that is images with galaxies and stars along with a count of how many galaxies there are in ...
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1answer
286 views

Instead of using flexible mirrors, could software be used for adaptive optics?

Telescopes that use adaptive optics now use flexible mirrors to adjust for distortions in the atmosphere. The mirrors are flexed in real time to account for the distortions. I am wondering if it ...
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135 views

Convert RGB pixel value of an image to limiting magnitude

I have taken photos at different exposures from different places of the Orion constellation. I wish to find the effect of skyglow on the limiting magnitude of stars in the Orion constellation. How can ...
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Does supermoon's white light splits into seven colours

I took a photo of SuperMoon 2016 and it was very shiny, the light around it showed seven colours. Was it my camera's effect or was it the moonlight's true colours.
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483 views

Why does the Moon's terminator look "wrong" in this image?

There is a picture of the moon in National Public Radio's on-line article Get Ready For Halloween By Watching The Moon's 'Occultation' Tonight. It looks wrong to me - specifically, the brightness ...
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1answer
220 views

What lens should I use for my Raspberry Pi?

I am building myself a camera that attaches to the back of my Celestron NexStar 4 SE telescope and I am not sure what type of lens to choose to replace the stock lens on the Raspberry Pi camera. I ...
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1answer
238 views

Why does Kepler's "Big Picture" of comet 67P look so strange? And what is the significance?

The observation of comet 67P by the Kepler space telescope has been reported in various science news outlets recently. For example, the image below appeared in the recent NASA news article NASA's ...
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1answer
154 views

Which camera body is best introduction for beginner amateur astrophotographer?

I currently own an old 1980s Celestron eight inch orange tube schmidt cassegrain telescope with tripod. I am seriously looking to dive into some astrophotography. I also own an olympus pen epl3 ...
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61 views

Amateur astronomy plan for GCSE students

I'm designing an amateur astronomy observational plan for GCSE Astronomy students here in the UK. I would like some advise to the suitability of what I have selected as the content. For the beginner ...
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1answer
209 views

Why are the stars in my image so green (false color image, HSO palette)?

This is my first try in false color imaging. The target was IC5070 - the pelican nebula. I took around 3 hours of data (around 1h for Ha, SII and OIII). Then after stacking did an LRGB combination in ...
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1answer
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Could this be a cosmic ray hit on my cameras sensor (CMOS, DSLR)?

While taking pictures of the bubble nebula I noticed a very strange artifact on only one of my pictures. It can't be a satellite since its not a straight line and this is a 90s exposure that should ...
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1answer
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How far into intergalactic space would you have to go to see the Milky Way?

If in the distant future a ship were somehow able to move beyond the galaxy and into intergalactic space, how far would it have to go before we could look out a window and see the Milky Way in its ...
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4answers
287 views

Would space-based telescopes need to remain in the shadow of Earth to avoid light interference from the sun?

So I am thinking about orbiting telescopes tonight and I was thinking that it would probably be beneficial to keep them in the shadow of the Earth or some other space body to avoid light interference. ...
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1answer
644 views

Unable to achieve focus

I feel like this is going to be a duplicate of this question, Astrophotography - Unable to achieve focus with current setup. However, the suggestions to go to a straight adapter doesn't apply in my ...
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471 views

Having some weird issues with my tracking (Advanced VX)

I need your help! I am having some weird tracking issues with my tripod (Advanced VX). When I setup and calibrated my scope yesterday I took this picture of NGC6888 (90s exposure): As you can see ...
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2answers
526 views

How to find which part of the sky a photo contains?

I was taking some photo stacks yesterday, and I also took a plenty of random ones (pointed not at a specific object) too at 200mm. However, I've ended with a shot but I have no idea where I pointed ...
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Which astronomical objects do we have images of, taken at ground level? [closed]

I am looking for images of astronomical objects taken at the ground level of the actual object, by something on the actual object, i.e. the Mars Rover. Is this the complete list and accurate?. Earth ...
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1answer
329 views

How did single dish (or single receiver) radio telescopes originally generate images?

That actually sums up my question nicely: How did single dish (or single receiver) radio telescopes originally generate images? - or at least 2D intensity maps or contour plots. Early radio ...
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1answer
340 views

What is the highest granularity focal-plane array on a dish radio telescope? Or is this the ONLY ONE?

There is a short Wikipedia article Focal Plane Arrays that enumerates some projects, but my question is more along the lines of what is (at least) nearly complete or in "first light" phase, even if ...
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2answers
476 views

Calculating the Diameter of Jupiter through Image

I was trying to calculate the diameter of Jupiter from a picture I took of it. Here's the information I was able to get that I needed to calculate the diameter: Focal Length of Telescope: 1.2 m ...
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1answer
649 views

Is the Sun slightly blue in the center? - Wavelength-dependent limb darkening of the Sun

I've slightly modified the title to try to attract some attention. If we call sunlight "white" and limb darkening is a result of seeing deeper at normal incidence and shallower at oblique incidence, ...
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752 views

Can I use an array of inexpensive cameras as an alternative to a telescope?

The link below describes how an array of inexpensive cameras can create very detailed images. Would this work for astronomy? https://graphics.stanford.edu/papers/CameraArray/
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1answer
916 views

Open source alternative for RegiStar (align, rotate, and combine images into single frame)

I'm looking for a free, open-source and Linux compatible alternative to the RegiStar software. I need it to automatically combine several images into a single frame, where each individual image shows ...
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1answer
366 views

How do I get focussed images with my T-adaptor and 6mm eyepeice?

I have a Celestron 5se + canon 650d. They are mated with the celestron t-ring and the 93625 t-adaptor. I want to take magnified photos of planets with the camera. But if I add an eyepiece to the t-...
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1answer
113 views

How accurately can you tell the time using a photo of the stars?

If I were to go out on a clear night, in an area with low light pollution, and take a photo of the stars, could an expert analyze the photo and figure out what date the photo is from? We can assume a ...
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2answers
76 views

How was precision astrometry done before digital imaging?

Did they just put a ruler on the photographic plate? Quite some precision must have been required to discover Neptune from its influence on Uranus for example.
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1answer
283 views

Unknown moving objects [closed]

Last night, I used my new Sony WX500 camera to get long exposure pictures of the sky from my backyard. I used the "Heavens Above" app to find out when satellite flares would happen and I even got a ...
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2answers
497 views

Photodetector Question: Does converting an RGB image to grayscale produce the same result as using a grayscale image detector?

FYI my application is not astronomy related, but I know astronomy folks have a lot of knowledge of photodetection and spectrometry instrumentation, so I am seeking this community's help. I'm ...
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1answer
129 views

Why are radar images of comets shaded only on one side?

NASA published a picture of a comet the other day. The image shows the comet being lit from above. See NASA's picture below. However, since it is a radar image, I would have assumed to get a shading ...
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1answer
72 views

Could the Sun's bending of light be measured on photographic plates before Einstein's prediction?

It was predicted from Newtonian physics already in the 18th century that gravity should bend light, but not by as much as general relativity predicts. This was first confirmed during a solar eclipse ...
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509 views

Are all the photos of the universe really so colorful or is it just visual effects that are added later?

Do the colorful pictures of the universe show how it looks like that in reality or is it just a visual effect that is added later.
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Dish antenna as parabolic mirror for OPTICAL telescope?

Can I use a chrome painted dish TV antenna as a parabolic reflector for my optical telescope? Given that glass mirrors are quite expensive, I am thinking of using a Dish TV antenna and coating its ...
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2answers
639 views

Would Adaptive Optics be Useful in Radio Astronomy?

This Question and Answer got me thinking. If atmospheric seeing at visible wavelengths is the result of refractive index inhomogeneity, would it also be a similar problem for mm to cm wavelengths? ...
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1answer
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How are the gaps filled in images captured by CCD arrays?

Large telescopes don't use a single CCD; they use arrays of them. Since CCDs can't be seamlessly joined, this means that every captured image must have gaps. But, the resulting images almost never ...
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1answer
181 views

Diameter of Astronomical Object Using Magnification

I took a picture of Jupiter through my telescope, using an iPhone. I know the magnification of the telescope lens I used, and can Google to get the magnification of the iPhone lens (the magnification ...
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3answers
111 views

Orion Constellation request

This isn't a question so much as a request. I'm looking for an image of the Orion constalletion I could use, but I would like to have a very high resolution HD image, whereby a lot of the deep sky ...
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2answers
414 views

Acquirable Raw Data in Amateur Astrophotography

What raw data can I possibly acquire from an 8" Classical Dobsonian Telescope, and a DSLR? Could anything eye-opening to amateur astronomers be computed or calculated first-hand with such equipment? I'...
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1answer
249 views

Is there a database for stars? [duplicate]

I'm interested, is there any database of stars which I could browse on the internet? It would be good, because I could read their parameters, features and maybe find a picture about it. Thanks!
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Successor to the Hubble Telescope

Are there any plans for the 'Hubble2'? Maybe with an even bigger mirror capable of even finer resolution, to look even deeper into the origins of the universe? If so, when can we expect to see it in ...
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3answers
426 views

Disc of the milky way

For those that haven't seen this link - please have a look as it's a an awe-inspiring 360 interactive panormic image of the milky way (may need a bit of time to load though!). I've found myself idly ...
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Online wide-field star cameras?

Where can I find a large list of online star cameras with wide fields of view? http://www.itelescope.net/all-sky-cameras is one example, but the images are fairly low resolution and there aren't many ...