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  • What is the actual resolution of Event Horizon Telescope?
    I The Shadow of the Supermassive Black Hole" states that Event Horizon Telescope has theoretical diffraction-limit resolution of ~25 μas Another wiki article states that M87* has Swartzschild radius of 5 9×10 -4 parsecs Combined with the distance of 16 4 million parsecs, this gives me angular size of 14 8 microarceconds
  • universe - Accelerated expansion - Astronomy Stack Exchange
    I try to understand the accelerated expansion of the universe, and my first idea to do so was to draw a graph of the speed of objects (in km s) relative to their distance (in MParsecs) My data sou
  • By type, how far out do we have good star maps?
    At a distance of 10 parsecs it would have an apparent magitude of 14 97, and at a distance of 100 parsecs it would have an apparent magnitude of 19 97 Groombridge 34 A has an absolute magnitude of 10 32 and is a M1 5V star
  • Determine distance from the galactic center in DS9
    1 degree is not 25 8 parsecs at the distance to the galactic center Start with the distance to the galactic center from our location, multiply by the tangent of the angle from the galactic center to get the distance from the center (excluding the line of site component, which may dominate)
  • Newest parsec Questions - Astronomy Stack Exchange
    A quick (elementary) check on arsecond conversion to sky distance in parsecs I just wanted to double check I had something correct If an object, say a nebula, is measured to roughly have a diameter or extent of, say, 250 arcseconds, would its diameter in parsec simply
  • parallax - A quick (elementary) check on arsecond conversion to sky . . .
    A quick (elementary) check on arsecond conversion to sky distance in parsecs Ask Question Asked 9 years, 4 months ago Modified 9 years, 4 months ago
  • galaxy - How can we calculate velocity of an object given the distance . . .
    If you had the distance from a celestial object, in parsecs, how would you calculate the velocity of the said object? Edit: I'm sorry I don't have more context, the specific questions is: "A galaxy that is 10 million parsecs away will be moving at what velocity?"
  • star - Proxima as Supernova - Astronomy Stack Exchange
    Proxima Centauri can't explode as supernova as it is about 2 orders of magnitude too small and light But if a supernova were to happen from that distance? How bright would it be? You can use the formula: $$\text {Apparent magnitude} = \text {Absolute magnitude}+5log_ {10} (distance)-5$$ where the distance is in parsecs Proxima centauri is 1 3 parsecs distant A supernova typically has an
  • How would I search within an angular distance of an object . . .
    1 I'm interested in the learning about the local densities around galaxies I've found myself a bit confused on how to relate angular distances (arcseconds) with physical distances (parsecs) when thinking about distances between two distant galaxies For example, let's say the average distance between galaxies within clusters is a few megaparsecs
  • observational astronomy - How can I calculate the distance between a . . .
    If a star has a parallax of (say) 0 5 arcseconds, then its distance is 2 parsecs (about 6 5 light years) Often the parallax is quoted in "milli-arcseconds" or "mas" If a star has a parallax of 25 mas, its distance is 1000 25 =40 parsecs (about 130 light years) For very distant stars, you should be aware that the uncertainty is very significant





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