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Uncommon star 30 EP

HD 211971

RA 334.8573° · Dec 60.1478° · star

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Score breakdown

· 4 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • White A-type star +5
  • Never sets (northern circumpolar) +4
  • Star +3
Total score 30

4 more points to reach Rare.

Badges

  • Star · +3
  • Never sets (northern circumpolar) · +4
  • White A-type star · +5
  • Supergiant · +18

Trivia

What it actually is

  • Spectral class. Its spectrum reads A2Ib — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • Where it is in life. It is a supergiant, hundreds of times wider than the Sun.

Find it in the sky

  • How to spot it. At magnitude 6.9 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Cepheus.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around August — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out orange (B−V 0.9) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 5090 K, against the Sun's 5778 K.

Properties

absmag
-13.13
bv
0.866
constellation
Cep
luminosity
15559656.3161
mag
6.87
name
HD 211971
spect
A2Ib

About HD 211971

HD 211971 is an uncommon star. It sits in the constellation Cep, shines at apparent magnitude 6.87 and has spectral type A2Ib.

Its spectrum reads A2Ib — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 211971 in the constellation Cep. At apparent magnitude 6.87, it is an easy target for binoculars.

Like any astronomical target, HD 211971 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.

Why HD 211971 is an uncommon star

HD 211971 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Never sets (northern circumpolar), White A-type star and Supergiant — 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.