Questions tagged [deep-sky-observing]
Questions about stellar objects which are too faint to observe with faint naked eye or even too far away for Earth-bound telescopes.
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questions
2
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0answers
43 views
How to use DeepSkyStacker to increase detail, reduces noise, and not lose colour?
I had my first attempt at shooting the Orion Nebula and am pleased that I saw it for the first time. Very exciting. I shot 10 frames and then stacked them using DeepSkyStacker which brought out all ...
0
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0answers
51 views
Why can't ESA/NASA build a handful of Gaia telescopes and launch them into different positions in space for better accuracy?
I've noticed that many stars in GAIA DR2 have highly uncertain distances. Why can't a space agency send multiple Gaia spacecraft into orbit around different places (One in L2 Earth, one in ...
4
votes
1answer
108 views
Why was StDr56 discovered only now?
StDr56 is a newly discovered planetary nebula (maybe). link1 link2
It was found by amateur astronomers Marcel Drechsler and Xavier Strottner.
According to the above articles, it's pretty big:
With an ...
1
vote
1answer
63 views
How big would the supernova when a neutron star collides with another neutron star? [closed]
If two neutrons stars that are orbiting were to collide, how big would the supernova explosion be?
Would a new black hole or a new supernova remnant be formed?
1
vote
1answer
142 views
Eyepieces and accessories recommendations for a Starblast 4.5-inch scope in a city as well as darker suburbs, and kid friendly?
For the Starblast 4.5 Telescope I currently have an Orion 7-21mm Zoom eyepiece attached on top of a 2x Barlow lens. I like them because of the magnification they give stacked together and the zoom ...
1
vote
3answers
249 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
vote
1answer
89 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
votes
0answers
40 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
44 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
votes
1answer
382 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
vote
1answer
79 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
votes
1answer
69 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
votes
1answer
84 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
votes
1answer
1k 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 Pachón in Chile".
NPR's Joe ...
3
votes
3answers
144 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
votes
2answers
773 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
vote
1answer
124 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
votes
3answers
1k views
What is the “lost light” in this unusual Hubble Deep Sky image?
The Daily Galaxy article “The Lost Hubble” –New! Deepest Image of the Universe Ever Taken says:
To produce the image a group of researchers from the Instituto de Astrofísica de Canarias (IAC) led ...
2
votes
1answer
52 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
votes
2answers
182 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 ...
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vote
2answers
57 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 1° north east from the δ Cas star. I am using the Stellarium ...
3
votes
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 ...
4
votes
4answers
962 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
votes
1answer
355 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
votes
1answer
180 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
votes
1answer
149 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
votes
1answer
244 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 ...
4
votes
2answers
149 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
votes
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
votes
1answer
478 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
votes
1answer
107 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
votes
1answer
283 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
votes
0answers
70 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
457 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 ...
3
votes
2answers
1k 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?
1
vote
1answer
125 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
votes
1answer
455 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
votes
1answer
121 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
votes
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
votes
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
votes
1answer
191 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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3answers
7k 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 ...
