RA 302.3754° · Dec 47.8714° · star
2 more points to reach Rare.
HD 191738 is an uncommon variable star. It lies about 3,197.6 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 8.65 and has spectral type R3v.
Its spectrum reads R3v — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
Look for HD 191738 in the constellation Cyg. At apparent magnitude 8.65, it is an easy target for binoculars.
Like any astronomical target, HD 191738 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
HD 191738 scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, Distant (over 1,000 light-years), Deep red star, Strongly variable and A named variable star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.