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  2. Binary star - Wikipedia

    en.wikipedia.org/wiki/Binary_star

    a is the distance between the two stellar centers, and; m 1 and m 2 are the masses of the two stars. If a is taken to be the semimajor axis of the orbit of one body around the other, then r 1 is the semimajor axis of the first body's orbit around the center of mass or barycenter, and r 2 = a − r 1 is the semimajor axis of the second body's ...

  3. Stellar parallax - Wikipedia

    en.wikipedia.org/wiki/Stellar_parallax

    As distances between the two points of observation are increased, the visual effect of the parallax is likewise rendered more visible. NASA 's New Horizons spacecraft performed the first interstellar parallax measurement on 22 April 2020, taking images of Proxima Centauri and Wolf 359 in conjunction with earth-based observatories.

  4. List of nearest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_stars

    Inaccuracies of these measured parameters make determining the true minimum distances of any encountering stars or brown dwarfs fairly difficult. [72] One of the first stars known to approach the Sun particularly close is Gliese 710. The star, whose mass is roughly half that of the Sun, is currently 62 light-years from the Solar System.

  5. Zeta Reticuli - Wikipedia

    en.wikipedia.org/wiki/Zeta_Reticuli

    The distance between the two stars is at least 3,750 AU (0.06 light-year, or almost a hundred times the average distance between Pluto and the Sun), so their orbital period is 170,000 years or more. [18] Both stars share similar physical characteristics to the Sun, [16] so they are considered solar analogs.

  6. List of the most distant astronomical objects - Wikipedia

    en.wikipedia.org/wiki/List_of_the_most_distant...

    This number is wrong; originally announced in 1891, the figure was corrected in 1910 to 40 ly (60 mas). From 1891 to 1910, it had been thought this was the star with the smallest known parallax, hence the most distant star whose distance was known. Prior to 1891, Arcturus had previously been recorded of having a parallax of 127 mas.

  7. Sirius - Wikipedia

    en.wikipedia.org/wiki/Sirius

    Sirius is a binary star system consisting of two white stars orbiting each other with a separation of about 20 AU [e] (roughly the distance between the Sun and Uranus) and a period of 50.1 years. The brighter component, termed Sirius A, is a main-sequence star of spectral type early A , with an estimated surface temperature of 9,940 K . [ 14 ]

  8. Mizar and Alcor - Wikipedia

    en.wikipedia.org/wiki/Mizar_and_Alcor

    The uncertainty is due to no-one knowing exactly how far away the stars are. If they are exactly the same distance from us then the distance between them is only 17 800 AU (0.281 ly). [7] Between Mizar and Alcor, the 8th-magnitude star Sidus Ludoviciana is a distant background object.

  9. 61 Cygni - Wikipedia

    en.wikipedia.org/wiki/61_Cygni

    61 Cygni / ˈ s ɪ ɡ n i / is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of about 659 years. Of apparent magnitude 5.20 and 6.05, respectively, they can be seen with binoculars in city skies or with the naked eye in rural areas without light pollution.

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