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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.

2
votes
1answer
45 views

Measure an angle in the sky from a photo?

Let's say I have an picture of the sky or of an landscape and I want to measure an angle in the celestial sphere. Is there any software for that? In real life I would use the empirical hand gestures ...
5
votes
1answer
46 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 ...
18
votes
2answers
4k views

What did I photograph?

Last night I was experimenting with my mobile phone shooting the night sky adjusting some settings like shutter time and ISO. One of the first pictures I thought was a complete failure, I only ...
3
votes
1answer
87 views

Is the dot on the photo - Mars?

The below photos were taken yesterday (August 4, 2018) at about 10 p.m. from the plane over the Black Sea. We were seeing the light dot on the left for at least 10-20 minutes. It looked like a bright ...
1
vote
2answers
85 views

Can a telescope image be amplified to see more by adding distant lenses or mirrors?

Could a lens or mirror be placed in orbit on the same flight path with other parts to make a telescope or on the horizon of the moon to see farther with the Hubble?
4
votes
3answers
194 views

Why do photos of Earth always have a black background?

if we are in the milky way, and people are able to take photographs from Earth that look like this: Then how come almost all of Earth's photos look like this? In the first photo, we are seeing what ...
4
votes
1answer
48 views

Does the focus of terrestial telecopes need adjustment for the distance of astronomical objects?

My rudimentary experience of photography and telescopes suggests that with commonly affordable optics any object beyond the range of hundreds to thousands of feet will be in adequate focus at the ...
4
votes
1answer
80 views

Is it possible to image a meteor so the rock is visible?

I was wondering what one would see if they were to look through a telescope tracking a meteor as it shot through the sky. Technology aside, would one be able to see the object tumbling or would it ...
5
votes
4answers
133 views

Measurement uncertainty of the computed center of gravity from pixel image

Establishing the position of celestial bodies (stars, and other objects) is based on imaging technology. Depending on the resolution of the imaging sensor used, an object is identified by a group of ...
3
votes
1answer
50 views

How to improve the quality of an image of the planets when taken through the eyepiece of a telescope with a dlsr camera

I have a reflector telescope with a 114mm aperture and 1000mm focal length. I find that to get the clearest image I can use a 4mm eyepiece, or with my 5x barlow a 20mm however, seeing that I am very ...
3
votes
1answer
51 views

Astrophotography: Is there a rule to the color mapping?

As I understand it most astrophotography is colored using filters and multiple exposures. I would assume that blue filters would be used for higher frequency emissions and red filters for lower ...
4
votes
3answers
199 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 ...
1
vote
3answers
173 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
1answer
109 views

How to calculate the position to be to see ISS passing in front of the moon or the sun?

I would like to know how to calculate the time/date of the ISS passing in front of the moon (between the observer and the moon) or the sun, or to calculate the position in which the observer have to ...
1
vote
1answer
55 views

How could I determine what areas of the Milky Way will be visible?

There is a new moon on Saturday, and the forecast in my area of Winnipeg, Manitoba, Canada calls for clear skies on that night. I would like to take a widefield astrophotograph. I have no idea what ...
1
vote
0answers
35 views

Why stars are not visible in photos of Planets from space [duplicate]

The night sky from many parts of the Earth, away from any city lights and pollution, is full of starts, mostly the stars of the Milky Way Galaxy is what fills the night sky densely. In many photos of ...
2
votes
2answers
66 views

Location of the milky way in August in Death Valley

I am going to be in Death Valley around August 8th. I was hoping to take a milky way shot with my camera when there. I would be shooting around 10pm. I am using google maps to scout out popular ...
1
vote
1answer
25 views

Does a set moon sky equal a new moon sky?

I am planning some astrophotography. And comparing two times. On one night I plan a midnight shoot when a waning crescent moon rises at 1am. This is 1 week ahead of the new moon. The other night ...
3
votes
1answer
180 views

What's the rationale behind the false colours in solar observation photographs?

Images from SOHO, SDO and other sun observatories are often coloured differently for different wavelengths or temperatures: http://www.nasa.gov/mission_pages/sunearth/science/Sun-Wavelength-Chart....
3
votes
1answer
179 views

How do we calculate the image circle of a telescope at prime focus?

I'm trying to find a suitable CCD and telescope combination. So, I want to make sure that the image circle of the telescope circumscribes the CCD. But I'm unable to find anything that tells me how to ...
5
votes
1answer
200 views

How (the heck) was this photo of Venus at inferior conjunction (between us and the Sun) taken?

This great answer by @gerrit discussing planetary phases seen in visible light contains the image I've included below. According to the Wikimedia Commons link these are ESO images from the Venus ...
1
vote
0answers
34 views

Tracking a heliographic coordinate on CCD

Given the latitude and longitude of a heliographic coordinate, I want to place the point on a CCD image and simulate its motion for a particular duration. Though I am able to track the motion of a ...
6
votes
2answers
226 views

Can Drizzle Integration increase resolution beyond theoretical resolution of telescope?

So I was wondering, if drizzle integration actually increases details in your image if the drizzled image results in higher resolution in terms of arcseconds / pixel than the telescope would allow (...
1
vote
0answers
46 views

RAW Astro-Photography and weird patterns upon Retinex algorithm use [closed]

Some years ago I've made some RAW pictures of the Orion and Aquila constellations, and then let it through Retinex algorithms. The effects are below. Can someone properly or accurately explain ...
35
votes
6answers
11k views

How do we have photos of galaxies so far away?

A possible answer for this is that, light emitted from the galaxies travelled a billion miles all the way to earth, where the hubble space telescope picked up this light through its sensors, and was ...
0
votes
1answer
113 views

A real light source, or an artifact?

I was taking shots of the 2017 eclipse using my D7200 camera with a 1000 ND filter. As I was going through the pictures after downloading them to a pc, I noticed that there's what appears to be a tiny ...
0
votes
1answer
542 views

How to photograph Saturn

I have been given an old telescope (Newtonian, 910mm) and I got a mount for my DSLR and I'm trying to take some pictures of various objects. In particular, I'm trying to photograph Saturn, but I'm ...
5
votes
2answers
383 views

Weird Blob near Polaris?

I need help identifying a blob. Last night I took a picture of Polaris, and there is a weird blob in it that I can't identify. Star charts and other pictures on the 'net do not show this blob. I ...
2
votes
2answers
83 views

How to reduce star trailing when taking long exposure photographs?

My telescope's sidereal tracking is lousy: it just doesn't work. To overcome this, when taking long-exposure photographs through it, what's the best way to reduce star trailing?
0
votes
1answer
285 views

Retrofitting a DSLR camera to a super-cheap Tasco reflector telescope

I was given a 1995 vintage Tasco "302003" Newtonian telescope recently and have had some exciting success with it. I have managed to view the Moon in beautiful detail and also had my first glimpse of ...
0
votes
0answers
35 views

Filters and solar photography

I have a ThorLabs FL632.8 filter (632.8nm == filter here) typically used for laser experiments in addition to a ND filter = 5.0. I've created a filter holder to fit in front of the front element of a ...
3
votes
2answers
155 views

Practicing image processing and analysis

I'm just getting into image processing and analysis using Python, and I'm looking for astronomical images (preferably raw, unprocessed images) to practice on. Can anyone suggest some places I can ...
4
votes
3answers
342 views

How do I see the milky way?

I've travelled to farms at night, and away from civilation. I don't really know alot about astronomy, but my goal is to see something like this: Stars, lots of them, but that "thick purple cluster of ...
0
votes
1answer
168 views

Solar Telescope Projector Screen? [& intro telescope for solar eclipse]

I don't know very much about telescopes; I used one a few times as a kid, but that's about it. I understand the general design & use of reflectors & refractors, but I don't know enough to ...
6
votes
1answer
745 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! ...
0
votes
1answer
79 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 ...
6
votes
2answers
348 views

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 ...
6
votes
0answers
130 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 ...
5
votes
1answer
295 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 ...
1
vote
1answer
153 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 ...
7
votes
3answers
301 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 ...
2
votes
2answers
448 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 ...
0
votes
0answers
131 views

Good unix based software to determine only galaxies in an image?

I found SExtractor but is there anything better? I only want galaxies in the image. I only have jpeg / RGB data. No FITS Data. Can anyone suggest something? Edit: Can someone tell me how to use ...
0
votes
1answer
127 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 / ...
1
vote
1answer
79 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 ...
3
votes
1answer
152 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 ...
2
votes
0answers
96 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 ...
3
votes
3answers
184 views

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.
0
votes
0answers
87 views

Given RA,DEC and date (or week) how can I obtain online a detailed image of the sky?

Given the RA, DEC and specific date (or week) how can I obtain a detailed image of the sky? Is it there any available site? The purpose is to extract the parallax by comparing with other image that ...
4
votes
1answer
201 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 ...