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Results tagged with distances
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user 31410
Questions regarding the amount of space between two objects, the units, or measurement thereof.
5
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2
answers
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What is the distance from Alpha Centauri to Barnard's Star?
Alpha Centauri AB is the closest star system to Earth (4.366 ly), followed closely by Barnard's star (5.988 ly). The closest star system to Alpha Centauri is Luhman 16 (3.8 ly from α Cen). So I am won …
- 6,733
4
votes
1
answer
67
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Why is WISE J0521+1025's distance so uncertain?
If you look at the Wikipedia page List of nearest stars and brown dwarfs
, you'll notice that all stars mentioned in the list have a very precise value; all are $\pm0.02$ ly (except for GJ 1005, but i …
- 6,733
1
vote
What's the difference between minutes and arcminutes?
One minute has two definitions. One is 1/60th of an hour, or 60 seconds, while the other is 1/60th of a degree. Typically, one minute is shorthand for "arcminute." You can tell between the two by repl …
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2
votes
Converting parsecs to light years in the dumbest way possible
You asked for a dumb, tedious way of doing it. So here it is, in all its glory
One parsec is defined as $$\dfrac{1}{\tan(1'')} \text{ AU}=\dfrac{648000}{\pi} \text{ AU}$$
As $1 \text{ AU} = 1495978707 …
- 6,733
4
votes
Accepted
Since Proxima Centauri orbits the other two Alpha Centauri stars, will it eventually be fart...
In about 26,000 years, Proxima Centauri will no longer be the closest star. Instead, Alpha Centauri AB will be the closest, but only for about ~7000 years, soon replaced by Ross 248 for 10000 years, a …
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1
vote
1
answer
57
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Cosmological redshift to distance calculation: Why are imaginary numbers involved?
I was looking at this question and read through the linked article http://arxiv.org/pdf/astro-ph/0007341v1.pdf. When I was attempting to compute the distance between two galaxies using the following f …
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1
vote
Cosmological redshift to distance calculation: Why are imaginary numbers involved?
It turns out that using the $\Lambda = 0$ formula for our universe does not work, as eshaya pointed out. Going to the section where $\Lambda \neq 0$, the paper presents this integral: $$\chi\left(z\ri …
- 6,733
0
votes
0
answers
59
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How long does it take for a galaxy (or other object) to disappear behind the cosmic sight ho...
After looking at this question, I am wondering, how long does it take for a galaxy or other space object, to disappear from our view from the Milky Way due to the expansion of the universe? Assume GN- …
- 6,733
3
votes
1
answer
2k
views
Minimum distance between planets
In our solar system, MOIDs (minimum orbital intersection distance) of different planets reach a minimum of ~30 million miles (Mercury and Venus). However, other star systems have more compact planets. …
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3
votes
1
answer
555
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Approximate spectral type and luminosity given apparent magnitude and distance
I am looking at the data acquired from the Gaia DR2 survey. I found that most of the stars had their distance and apparent magnitude catalogued, but not their spectral type and luminosity class. Is th …
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