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Rare star 40 EP

HR 6447

RA 261.0783° · Dec -60.6738° · star

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Score breakdown

· 5 badges
40 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Naked-eye visible +8
  • Hot blue B-type star +6
  • Blue-white star +5
  • Star +3
Total score 40

10 more points to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Hot blue B-type star · +6
  • Supergiant · +18
  • Blue-white star · +5

Trivia

What it actually is

  • Spectral class. Its spectrum reads B8Ib/II — 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 supergiant, hundreds of times wider than the Sun.

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 5.8 you can see it with your own eyes from a dark site, over in Ara.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around June — 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. ≈ 15.6 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-1.417
bv
-0.067
constellation
Ara
dist ly
888.7086
luminosity
321.2181
mag
5.76
name
HR 6447
spect
B8Ib/II

About HR 6447

HR 6447 is a rare star. It lies about 888.7 light-years from Earth, sits in the constellation Ara, shines at apparent magnitude 5.76 and has spectral type B8Ib/II.

Its spectrum reads B8Ib/II — 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 HR 6447 in the constellation Ara. At apparent magnitude 5.76, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 6447 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 HR 6447 is a rare star

HR 6447 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, Naked-eye visible, Hot blue B-type star, Supergiant and Blue-white 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.