Questions tagged [deep-sky-observing]
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38
questions
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3answers
54 views
What is a good focal length for DSO
I found two telescopes that i'd like to buy, but one has 900mm focal length ((Skywatcher Newton 114/900 EQ1)) and the other has 500mm focal length ((National Geographic Dobson N 114/500)).
My ...
1
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1answer
65 views
How is the distance of a star from Earth calculated in the HYG star database
The HYG star database can be found here
From the hygdata_v3.csv file, how are the cartesian (x,y,z) coordinates calculated? (Is there a mathematical formula for this?)
And in the dso.csv file, there ...
2
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0answers
26 views
Detect sources near image edge with python photutils
As my question suggests, I 'm trying to use a python library photutils in order to detect sources from MUSE cube. MUSE (Multi Unit Spectroscopic Explorer) is an ...
2
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0answers
41 views
Approximately how many light years across (arclength) was the furthest reaches of the Hubble Ultra Deep Field?
I can find the area($11^2$ arcminutes) and lengths ($200$ arcseconds per side) but if I were to consider just the furthest region (arclength) of the survey, about how many light years across would ...
2
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1answer
225 views
DSO in a 60mm telescope
I am thinking about buying a telescope, but here in Brazil they are very expensive and hard to find where to buy. So, the better telescope I can pay for is a Celestron Powerseeker 60AZ. My main ...
1
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1answer
66 views
How can I use my current camera whose zoom lens can't be removed behind an f/6 refractor for as an astrophotography?
I am looking at an Astrotech AT60ED (60 mm f/6 with a field flattener) and a Digi-Kit telescope adapter to do astrophotography, mainly deep-sky and I'm wondering if I can use my current Panasonic DMC-...
0
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1answer
68 views
Astronomical animations of deep space objects
Is there any real animations from NASA or others (not simulation or Artist's impression) like this
https://svs.gsfc.nasa.gov/vis/a000000/a004400/a004442/frames/730x730_1x1_30p/
or this
https://...
2
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1answer
82 views
Do large telescopes, especially plans for the LSST, avoid saturation artifacts from the brightest stars and planets? If so, how?
This interesting answer to What is the LSST's plan to address frequent satellite trails in data? quotes:
From the LSST webpage:
The first group of Starlink satellites are sufficiently bright during ...
14
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1answer
996 views
Will LSST make a significant increase in the rate of astronomical event alerts?
The NPR news article and podcast New Telescope Promises To Revolutionize Astronomy updates the status of the "Large Synoptic Survey Telescope under construction on Cerro PachĆ³n in Chile".
NPR's Joe ...
3
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3answers
131 views
What causes these asteroid trails to be so strangely shaped and repeated?
The Phys.org news item Hubble is the ultimate multitasker: Discovering asteroids while it's doing other observations includes the image below.
What causes these asteroid trails to be so strangely ...
3
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2answers
533 views
How to locate nebulas visible through AstroMaster 114 telescope without device assistance?
I will be going to the desert this month and it's my understanding that the night sky will be very dark there. I've got some practice locating the planets but I'd really like to get a look at a nebula ...
1
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1answer
111 views
When a rogue brown dwarf star hits a white dwarf star, will the collision at most cause a nova? [closed]
When a rogue brown dwarf star hits a white dwarf star, will the collision at most cause a nova?
Or can the explosion be heavier?
16
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3answers
1k views
What is the “lost light” in this unusual Hubble Deep Sky image?
The Daily Galaxy article āThe Lost Hubbleā āNew! Deepest Image of the Universe Ever Taken says:
To produce the image a group of researchers from the Instituto de AstrofĆsica de Canarias (IAC) led ...
2
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1answer
49 views
Cases of gravitational lensing resulting in a recognizable image of an extended object?
There are several different classifications of gravitational lensing phenomenon.
Here I am asking for any examples of strong lensing where the lensed image of an extended object is magnified and ...
3
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2answers
151 views
I've seen some stars tonight. What could I possibly have been looking at with these pictures?
The weather tonight here is great and I decided to shoot some hand-held (too bad I don't have any tripod) night mode pictures shot with P10. I have no experience in stars observation therefore I can't ...
1
vote
2answers
50 views
How to find a deep sky object 1° NE from a given star
I am an amateur so sorry for any misunderstanding.
I am trying to find a deep-sky object located 1Ā° north east from the Ī“ Cas star. I am using the Stellarium ...
3
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1answer
75 views
Studies of isotropy from different ends of the visible universe?
Have there been studies to compare structures that are 26 billion light years distant (i.e. from one side of the observable universe to the other) to search for faint differences?
19
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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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4answers
891 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
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1answer
290 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 ...
4
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1answer
178 views
Might the SpaceX Roadster intercept any ongoing surveys?
There are star survey telescopes in space, and on Earth. I don't really know how to begin to know where they will all be looking for the next few months. On the off-chance that someone does, or can ...
4
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1answer
143 views
What have we learned from the observation of most distant galaxies [closed]
We have seen galaxies around 13 billion years old. Since these galaxies formed so early in the history of the known universe, are there observables about these galaxies that are apparently different ...
0
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1answer
224 views
Buying a telescope for the first time. How important is the focal ratio and is a computerised telescope worth it?
I'm wanting to purchase a telescope for the first time. I've narrowed it down to 2 options based on what I've discovered from researching and my price range. I mainly want do planetary observations ...
3
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2answers
147 views
What is the largest (angular) dark area in the sky?
Question
Within our current knowledge, what is the largest (circular, say) area in the sky which is empty/dark? I'm thinking in terms of angular size.
Motivation
I was wondering what was the ...
13
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4answers
1k views
Why are there so many seemingly blue-shifted galaxies in deep space
NASA released this image of deep space. The way light shifting vis-a-vis universe expansion is supposed to work is by making the furthest galaxies appear mostly red-shifted. But NASA's image shows ...
2
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1answer
428 views
Power of the James Webb Space Telescope [duplicate]
I have heard that the JWST will be capable of looking at the early stages of the universe. However I have also heard that it won't be capable of detecting the Oort Cloud that supposedly provides ...
0
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1answer
105 views
SDSS. Google Sky and DeCaLs
(1) Please go through following image
Possible Super Red Giant?
However sdss shows it as galaxy! Am I missing something.
(2) Google Sky shows object in latitude and logitude format like this.
Is ...
2
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1answer
279 views
Has the most luminous object in the universe been found?
It's hard to search through the entire (observable) universe, but the most luminous thing there is must on the other hand be easy to find. Can we now say that the most luminous quasar we know, is the (...
3
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0answers
67 views
How does one find the extinction coefficient of a particular galaxy? [closed]
I am doing photometry on a number of objects in a number of different galaxies. I need the extinction coefficients for these galaxies for various filters passes. Is there some database that displays ...
5
votes
1answer
448 views
Why are Hubble images “Cut”
Whenever you take a look at a photo that is taken by hubble,
Lets say M87 or Eagle Nebula or maybe Ultra Deep space field,
The Image is always "Cut"
Like this :
or this
I want to know reason ...
2
votes
2answers
937 views
Calculating area of visible sky
Can we calculate the area of sky visible to us from the point we are standing?I mean is there any idea or experiment to calculate it?
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1answer
123 views
What is the line of light in galaxy cluster MACS J1206?
I noticed this in a thread from world building, what is the continuous line of light in MACS J1206 slightly right of center in this picture? The only thing I could think of would be the side view of a ...
8
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1answer
433 views
Have we detected galaxies which have red-shifted beyond the visible light range?
According to this answer it is possible for galaxies' light to move beyond the visible frequencies due to redshift:
...
5
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1answer
120 views
Red shifting galaxies
I am an amateur astronomer please correct if any of my understandings are wrong. We all know that from the Hubble's ultra deep field image the most distant galaxies which were created shortly after ...
2
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4answers
2k views
Is it difficult to see DSO in your eyepiece?
I want to know if bringing the image of a DSO in eyepiece generally represents a problem for beginners in astronomy.
3
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1answer
142 views
Sloan digital sky survey galaxies
I am trying to get some data from the Sloan digital sky survey (SDSS). This task turned out to be challenging for me as someone with only little knowledge about astronomy and maybe someone here can ...
5
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1answer
186 views
Space objects visible from earth
I recently saw the International Space Station without a telescope. Are there any other man-made space objects that can be seen using bare eyes?
11
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2answers
6k views
Are Barlow Lenses Good For Deep Sky Observing?
I'm using a 750mm (focal length) by 150mm (aperture) newtonian reflector and I've been curious about using Barlow lenses on deep sky objects.
Some of the astronomers at my local observatory say that ...
