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Rare star 49 EP

Alcyone

RA 56.8712° · Dec 24.1051° · star

Real photograph of Alcyone 📷 Real photo
NASA, ESA, AURA/Caltech, Palomar Observatory
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Score breakdown

· 8 badges
49 pts · Rare
Rare 50 pts → Epic
  • Intrinsically luminous (Mv < −2) +10
  • Naked-eye visible +8
  • Has a proper name +8
  • Hot blue B-type star +6
  • Giant star +6
  • Blue-white star +5
  • Star +3
  • On the zodiac +3
Total score 49

1 more point to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Has a proper name · +8
  • On the zodiac · +3
  • Hot blue B-type star · +6
  • Giant star · +6
  • Blue-white star · +5
  • Intrinsically luminous (Mv < −2) · +10

Trivia

What it actually is

  • Spectral class. Its spectrum reads B7III — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 2.9 you can see it with your own eyes from a dark site, over in Taurus.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Getting there

  • Aboard Voyager 1. ≈ 7.1 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-2.61
bv
-0.086
constellation
Tau
dist ly
403.1595
luminosity
963.829
mag
2.85
name
Alcyone
named
yes
spect
B7III

About Alcyone

Alcyone is a rare star. It lies about 403.2 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 2.85 and has spectral type B7III.

Its spectrum reads B7III — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for Alcyone in the constellation Tau. At apparent magnitude 2.85, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Alcyone 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 Alcyone is a rare star

Alcyone scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 8 science badges — Star, Naked-eye visible, Has a proper name, On the zodiac, Hot blue B-type star, Giant star, Blue-white star and Intrinsically luminous (Mv < −2) — 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.