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Uncommon star 32 EP

HR 2679

RA 106.6499° · Dec -12.3939° · star

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Score breakdown

· 4 badges
32 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • Hot blue B-type star +6
  • Blue-white star +5
  • Star +3
Total score 32

2 more points to reach Rare.

Badges

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

Trivia

What it actually is

  • Spectral class. Its spectrum reads B7Iab... — 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. Drop it where the Sun is and its surface would engulf the inner planets.

Find it in the sky

  • How to spot it. At magnitude 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in, 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.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out blue-white (B−V -0.1) — the hallmark of a surface far hotter than the Sun's.
  • 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 11990 K, against the Sun's 5778 K.

Properties

absmag
-13.52
bv
-0.124
constellation
CMa
luminosity
22284351.4927
mag
6.48
name
HR 2679
spect
B7Iab...

About HR 2679

HR 2679 is an uncommon star. It sits in the constellation CMa, shines at apparent magnitude 6.48 and has spectral type B7Iab....

Its spectrum reads B7Iab... — 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 2679 in the constellation CMa. At apparent magnitude 6.48, it is an easy target for binoculars.

Like any astronomical target, HR 2679 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 2679 is an uncommon star

HR 2679 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 4 science badges — Star, 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.