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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Determing timestamp of a photo of the stars using a plate solver

This question from 2016 seems to suggest that you need a powerful telescope to get a photo of the stars in such a way that you can use their proper motion to get a timestamp. If this is possible, how ...
requiemman's user avatar
7 votes
1 answer
143 views
+100

Finding stars that would be visible from satellite

I'm working on a mock image of a picture taken from a satellite (like ISS). Lets say I have a camera on ISS pointing in the direction of velocity (I have this velocity vector defined in ITRF and ...
jlipinski's user avatar
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6 votes
1 answer
231 views

First photographic image taken with telescopes to produce astronomically useful results? What telescope was used?

comments on the question and answer(s) to What are the technological advancements that made it possible for modern large telescopes to work with alt-az mounts instead of equatorial mounts? have made ...
uhoh's user avatar
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1 vote
0 answers
54 views

With a non-motorized telescope, can 100 pictures of 0.5 seconds be realigned and merged to get the equivalent of a 50-second long exposure shot?

I have a non-motorized Newton 130/900 telescope. Of course, it's hopeless to do pictures with exposure ~ 1 minute. Even 1 second is probably too much, as seen in Optimal exposure time for photography ...
Basj's user avatar
  • 111
5 votes
2 answers
312 views

Elevation difference of analemmas' taken at different hours and the reason for the tendency of analemmas' being slanted with deviation from the noon

According to Wikipedia, in astronomy, an analemma (/ˌænəˈlɛmə/; from Ancient Greek ἀνάλημμα (analēmma) 'support') is a diagram showing the position of the Sun in the sky as seen from a fixed location ...
Jacob Miller's user avatar
6 votes
1 answer
168 views

Human Brightness perception and contrast

This is kind of an interdisciplinary question on human brightness perception and the ability to distinguish grayscales. To be honest, I wasn't sure if the Physics, Biology or Computer graphics SE site ...
Charles Tucker 3's user avatar
5 votes
2 answers
555 views

Sky illumination based on moon phase and altitude

Does anyone know if there has been any work in determining the impact of the moon on sky brightness based on phase, moon altitude (including below the horizon), location altitude, humidity, etc? This ...
tockpeas's user avatar
0 votes
1 answer
54 views

Instead of a five-element corrector for arced drift trajectories, why didn't the ILMT just use CCDs fabricated w/ slightly non-cartesian pixel layout?

Phys.org's New Indian telescope identifies its first supernova links to the recent arXiv Follow-up strategy of ILMT discovered supernovae. The International Liquid Mirror Telescope is no ordinary ...
uhoh's user avatar
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4 votes
1 answer
234 views

Where can i find dark frames in the ESO archive?

I am doing an image reduction with data from ESO but I can't find dark frames when I download the zip-folder even though I downloaded the associated callibration files. The image reduction I am doing ...
Mich Vaughan's user avatar
1 vote
0 answers
52 views

How do eyepiece mm values equate to telescope tube extension mm values?

I'm trying out a DSLR on my Celestron 70EQ refractor telescope with a DSLR T-ring. The first try didn't magnify very much, and I learned that I need to extend the focus length to magnify the image; I'...
KJ7LNW's user avatar
  • 241
3 votes
1 answer
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Is it possible to detect lyman alpha blobs (LABs) with the lyman-break method?

LABs are luminous extended nebulae of hydrogen gas in the early universe (z ≥ 3) found in overdensities of LAEs (lyman-alpha emitters) and LBGs (lyman-break galaxies). I was wondering if LABs could be ...
Ankit Biswas's user avatar
0 votes
0 answers
96 views

I have access to a planetarium, how to make a video for it?

I have access to a planetarium. And am very excited to try making some video that can be played inside this dome. Can you give some directions? It has about 6 projectors. I dont know what is the video ...
thevikas's user avatar
  • 171
8 votes
2 answers
3k views

How to tell if a meteor video or photograph is fake?

With the Perseids at their peak, many people are sharing amazing photographs and videos — and some of them clearly more exercises in special effects than actual sky-watching. My daughter's friend sent ...
mattdm's user avatar
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3 votes
1 answer
121 views

What are these dark artifacts in this New Horizons image?

Are these photographic artifacts of some kind and if so how would they occur? They are almost the same exact shape and size. It is a photo of the Kuiper Belt from the New Horizon space probe taken ...
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1 vote
0 answers
46 views

How to align iOptron Skyguider Pro with iPolar camera without computer?

I’m considering the iOptron Skyguider Pro star tracker with the iPolar camera, but this requires a computer. How do you align this star tracker if you have a problem with the computer, don’t have the ...
Listerone's user avatar
  • 111
1 vote
1 answer
194 views

How to mount a 2" filter to a DSLR or mirrorless camera?

I'm considering using a 2" filter for astrophotography with DSLR and mirrorless cameras. Filters are typically measured in mm, but I understand that a "2 inch" filter is really a 48mm ...
Ana's user avatar
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8 votes
0 answers
204 views

Is there a standard deconvolution procedure to remove JWST's diffraction pattern yet? If so, would Arp 220 be a good candidate on which to try it?

Source: Webb captures the spectacular galactic merger Arp 220 Shining like a brilliant beacon amidst a sea of galaxies, Arp 220 lights up the night sky in this view from the NASA/ESA/CSA James Webb ...
uhoh's user avatar
  • 31.3k
4 votes
2 answers
221 views

Narrowband imaging wavelengths in NIR?

Lines giving useful (& beautiful) data in visible spectrum are well known - H-b, O-III, H-a, S-II. Unfortunately light pollution is strongest in visible light. Are there similar relatively bright ...
BarsMonster's user avatar
7 votes
1 answer
201 views

Did they ever figure out why Parker's WISPR cameras were able to see the surface of Venus? Mischaracterized filter, or unexpected atmospheric window?

Credit: NASA/Johns Hopkins APL/Naval Research Laboratory/Guillermo Stenborg and Brendan Gallagher Also refer to the technical material cited in the Space Exploration SE question How brightly does ...
uhoh's user avatar
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3 votes
1 answer
65 views

What components (parts) are needed to connect telescope to DSLR?

I have several years of experience with DSLR photography and some astro photography (milkyway) with DSLR. Recently, my wife gifted me an explore scientific ED80 APO telescope. I have an old Nikon ...
Uday Shankar S's user avatar
8 votes
1 answer
149 views

What are the twinkling stars in the New Horizons Arrokoth approach?

I've circled them in this edit: Source: https://commons.m.wikimedia.org/wiki/File:New_Horizons_Approach_to_Arrokoth.ogv Note, this has generated frames, see the source....
Rabbi Kaii's user avatar
14 votes
2 answers
3k views

How did asteroid (7482) 1994 PC1 get its "face"? Is it reconstructed from optical or radar imaging, or something else?

(Image sources linked below) NPR's March 10, 2023 Newly found asteroid has a 'very small chance' of hitting Earth, NASA says includes an image of what looks like a computer reconstructed 3D surface of ...
uhoh's user avatar
  • 31.3k
2 votes
0 answers
51 views

Angular extent of this composite Chandra / JWST image of the Tarantula Nebula?

I thought I’d ask this question here, as I couldn’t readily find the answer looking through online resources. What is the angular extent of the composite Chandra / JWST image of the Tarantula Nebula ...
Bruce Simonson's user avatar
11 votes
2 answers
2k views

Small bright constellation on the photo

I did a photo of the night sky and wanted to find a constellation on it. I've suggestion that it is Delphinus constellation. Could you please help me figure it out. Also, I'm curios about good way to ...
pacman's user avatar
  • 247
4 votes
1 answer
115 views

Why does one object (star?) in this JWST image have two sets of six+plus+two diffraction spikes but another, similar object nearby have only one?

CNN's February 24, 2023 Astrophysicist says 'there is nothing wrong with not knowing' is basically an opportunity for Neil deGrasse Tyson to give us a pep talk and reminder about the exciting process ...
uhoh's user avatar
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9 votes
3 answers
3k views

Are the 2 planets in this image Venus and Saturn? And is this a fireball shooting star in top right of picture?

I took this picture with my iPhone on January 23, 2023 @6:01pm CST. I am in West Central Alabama very close to the Tenn-Tom Waterway a few miles from the MS state line. I was facing west-southwest. I ...
Tammy Kent's user avatar
2 votes
0 answers
60 views

What would be a good telescope to buy for amateur practice? [ Specifications in description ]

I'm a beginner in Astronomy in general and would like to have something like this with which I could do amateur photography and generally practice. What would be a good telescope to buy with the ...
Sergej Zivkovic's user avatar
2 votes
0 answers
89 views

Does the 500 rule apply to astrophotography with a telescope?

On clear nights, I mount my Samsung Galaxy S10 to my 130mm aperture telescope and take pictures of certain deep-sky objects. Recently, I took pictures of the Orion Nebula. In order to get the optimal ...
Sovereign Inquiry's user avatar
1 vote
0 answers
36 views

How to know aperture when mounting smartphone on telescope?

I have a telescope with a 130mm aperture and a Samsung Galaxy S10, which I mount to my telescope and use to take pictures. When considering the total aperture, how would I calculate the combination ...
Sovereign Inquiry's user avatar
2 votes
1 answer
156 views

Can we simply multiply a positive value to each pixel in order to enhance contrast and to discard Time Delay Integration technique?

As shown in the figure below, the Time Delay Integration (TDI, the right side of the figure) is aimed at accumulating multiple exposures of the same (moving) object, effectively increasing the ...
Rocky Tseng's user avatar
2 votes
1 answer
177 views

Can a Panasonic Lumix DMC-FZ2000 be attached to a Celestron StarSense Explorer DX 130AZ

We recently bought a Celestron StarSense Explorer DX 130AZ for our children and we like to take some pictures of what we are seeing through the telescope. We know that's a beginner telescope and not ...
Scoregraphic's user avatar
1 vote
0 answers
65 views

What do negative values on bright sources in TIRSPEC mean?

I opened a FITs image data from TIRSPEC (NIR imaging) (an HgCdTe infrared imaging sensor) on DS9 and I saw that some of the bright stars have black patches at the center (negative values). Can you ...
Rian's user avatar
  • 503
14 votes
2 answers
327 views

Strange bump in solar spectrum taken with home-made spectrograph

I am an astronomy teacher, and made some kind of spectrograph with a difraction grating, a 3D printed slit, water pipes and a reflex camera. With a group of students we got this picture of the solar ...
Luis López's user avatar
4 votes
0 answers
76 views

Why can four-eight "rays" be seen around all stars in astronomy photographs from the Hubble Space telescope? [duplicate]

In famous astronomy photographs from the Hubble Space telescope such as the Pillars of Creation, each star has four rectilinear "rays" projecting out in the intercardinal directions, and ...
Toivo Säwén's user avatar
6 votes
1 answer
159 views

What is the equation for the radius of a star trail?

I have been studying star paths, and have successfully used the following equations to map star paths in a multiple exposure photograph onto circles of a radius determined by the star's declination ...
AtomPages's user avatar
2 votes
0 answers
66 views

Where does FireCapture save FITS photos during recording?

I made a lot of FITS photos yesterday and accidentally the laptop battery was discharged and it was turned off before I pressed the stop button. Now, I don't see that last session in folder with other ...
Robotex's user avatar
  • 246
2 votes
2 answers
87 views

Optimal exposure time for photography with unmotorized telescope

Since celestial objects move along the sky, taking long exposure shots with an unmotorized telescope will show a straight or slightly curved line of light instead of the still object (star trail). ...
chowder's user avatar
  • 492
2 votes
1 answer
82 views

What parameters can we obtain from imagery of planets?

Looking at images for the planets of the solar system in all different wavelengths, I was wondering whether we can deduce any information about the planet itself without using anything other than an ...
Belal Bahaa's user avatar
5 votes
0 answers
133 views

What is this cluster of light trails captured on long exposure images?

I was taking photos of the Perseids meteor shower on 13/08/2022 in Peak District in the UK. The camera was fixed stably on a tripod, set on manual mode, taking 8-second exposures continuously. When I ...
Anthony's user avatar
  • 151
1 vote
0 answers
41 views

iOptron ZEQ25GT mount advice needed

I am interested in purchasing a used iOptron ZEQ25GT mount which is a being sold at $500 by an experienced owner. It is in good condition. Can someone share their experience on using this mount, or ...
user1753541's user avatar
1 vote
1 answer
110 views

Astrometry and Geometric Distortions

CCD's are widely used for astrometry. Since a spherical surface (the celestial sphere) is projected onto a rectangular surface, the plate scale or pixel scale (approximated with 1/focal length etc) is ...
Cheng's user avatar
  • 332
1 vote
0 answers
44 views

Curved milky way image [duplicate]

In today's microsoft bing https://www.bing.com/ background image the milky way is seen as curved. How is this possible?
sno's user avatar
  • 1,457
43 votes
6 answers
7k views

In this image taken by Voyager 1, which is closer: the earth or the moon?

NASA reports this photo was taken 19 Sep 1977 by Voyager 1: It doesn't strike me as obvious how to determine which celestial body is closer to Voyager 1 as the photo was taken. My (not very ...
Rebecca J. Stones's user avatar
1 vote
0 answers
64 views

How to calculate shooting distance for an astronomical object

With a 50mm full frame lens and a 35mm sensor (or film), how far should I be to shoot Earth with earth’s edge just inside top and bottom edge of the resulting image? I don't want any cropping. Earth ...
Ariel Narboada's user avatar
4 votes
0 answers
101 views

Is there a website or app that can add declination and RA grid to an existing photo?

For a few years now, I've been shooting photos of the night sky with just a tripod and my Nikon DSLR. After extensive post-processing to mitigate light pollution, I usually submit the final results ...
user382459's user avatar
7 votes
2 answers
1k views

Finding Scorpius in the Milky Way panorama

I'm searching for the constellation of Scorpius in this image. Unfortunately this is a task too hard for a newbie like me, so I would like to have an hand about that.
matteogost's user avatar
2 votes
1 answer
188 views

How far above the galactic plane would a telescope array need to be in order to image the whole galaxy?

I hope this isn't a stupid question, but Google searches are turning up nothing relevant. I was just thinking about how it's difficult for us to determine the true shape and composition of the Milky ...
Curious Layman's user avatar
1 vote
0 answers
214 views

What settings should I use for my telescope-mounted smartphone to take night sky pictures?

Last night, I managed to take my first successful picture of a nebula--the Orion Nebula (see picture below). I'm incredibly ecstatic, as before I had been limited to taking images of the moon. I used ...
Sovereign Inquiry's user avatar
4 votes
1 answer
151 views

Camera settings for Astrophotography

I own an Orion 10015 StarBlast 4.5 Astro Reflector Telescope and I recently bought a Lumix G7 camera then I bought the adapter needed to attach the camera to the telescope. I tested it today at ...
SoldierCorp's user avatar
9 votes
1 answer
419 views

How to determine the scale on astronomical images?

I've always been amazed at the many beautiful images of objects in the night sky. The Andromeda galaxy is a superb example. But it was only a few years ago that I discovered that Andromeda in those ...
Roger Wood's user avatar
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