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Rare star 34 EP

HR 2812

RA 110.5564° · Dec -19.0166° · star

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Score breakdown

· 5 badges
34 pts · Rare
Rare 50 pts → Epic
  • Bright giant +12
  • Naked-eye visible +8
  • Hot blue B-type star +6
  • Blue-white star +5
  • Star +3
Total score 34

16 more points to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Hot blue B-type star · +6
  • Bright giant · +12
  • Blue-white star · +5

Trivia

What it actually is

  • Spectral class. Its spectrum reads B5II/III — 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 bright giant, well on its way to the largest stars there are.

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 4.9 you can see it with your own eyes from a dark site, over in Canis Major.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around January — 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. ≈ 8.5 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-0.904
bv
-0.039
constellation
CMa
dist ly
481.056
luminosity
200.2627
mag
4.94
name
HR 2812
spect
B5II/III

About HR 2812

HR 2812 is a rare star. It lies about 481.1 light-years from Earth, sits in the constellation CMa, shines at apparent magnitude 4.94 and has spectral type B5II/III.

Its spectrum reads B5II/III — 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 2812 in the constellation CMa. At apparent magnitude 4.94, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 2812 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 2812 is a rare star

HR 2812 scores 34 points on Spacedle's rarity scale, which places it in the rare tier. Another 16 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, Naked-eye visible, Hot blue B-type star, Bright giant 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.