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Uncommon star 28 EP

HD 106000

RA 183.0032° · Dec -64.5104° · star

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Score breakdown

· 4 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Bright giant +12
  • Under the Southern Cross +8
  • White A-type star +5
  • Star +3
Total score 28

6 more points to reach Rare.

Badges

  • Star · +3
  • Under the Southern Cross · +8
  • White A-type star · +5
  • Bright giant · +12

Trivia

What it actually is

  • Spectral class. Its spectrum reads A2II — 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 bright giant, well on its way to the largest stars there are.

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 Crux.
  • 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 March — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.3) — hotter and whiter than the Sun, the colour of Sirius or Vega.
  • 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 7690 K, against the Sun's 5778 K.

Properties

absmag
-13.46
bv
0.266
constellation
Cru
luminosity
21086281.4993
mag
6.54
name
HD 106000
spect
A2II

About HD 106000

HD 106000 is an uncommon star. It sits in the constellation Cru, shines at apparent magnitude 6.54 and has spectral type A2II.

Its spectrum reads A2II — 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 106000 in the constellation Cru. At apparent magnitude 6.54, it is an easy target for binoculars.

Like any astronomical target, HD 106000 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 106000 is an uncommon star

HD 106000 scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Under the Southern Cross, White A-type star and Bright giant — 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.