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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.

2
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2answers
77 views

Why do we use filters in telescopes for astronomical imaging?

I have read that if we image without a filter we get no information about the color or SED of objects. Can anyone elaborate the reasons for using filters for imaging/photometry? What happens if we ...
1
vote
1answer
63 views

Calculating the Size of Earth in the Apollo 8 Earthrise Photo

I was debating with someone online (I know, great way to get nowhere fast) regarding the size of Earth as it appears in the famous 'Earthrise' photos from Apollo 8. Below is an accurate (almost pixel-...
2
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0answers
30 views

Why can't I use automatic photometry on IRIS?

I'm trying to do photometry on my stacked images of the night sky, but when I use the program IRIS and try to do automatic photometry, it always says it's a wrong image number and in every example of ...
1
vote
1answer
60 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-...
14
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3answers
3k views

Which part of the milky way does the image show?

As a general question and more in specific regarding the image above: Which part of the milky way, planets, stars, clusters are included in the image? How can I know which entities are included in ...
4
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2answers
50 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
votes
1answer
51 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
66 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
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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
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1answer
106 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 ...
2
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2answers
97 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?
5
votes
3answers
272 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
52 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
82 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
150 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
59 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
55 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
2answers
206 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
230 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
122 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
58 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
39 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
98 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
33 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
353 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
257 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
216 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 ...
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0answers
36 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
291 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 (...
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0answers
53 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
12k 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
115 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
647 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
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2answers
392 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
89 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
373 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 ...
3
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2answers
184 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
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3answers
656 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
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1answer
193 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
923 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
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1answer
82 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
510 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 ...
8
votes
0answers
147 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
357 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
177 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
307 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
576 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
136 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
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1answer
143 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 / ...