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Uncommon star 26 EP

HD 269781

RA 83.5936° · Dec -67.0232° · star

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Score breakdown

· 3 badges
26 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • White A-type star +5
  • Star +3
Total score 26

8 more points to reach Rare.

Badges

  • Star · +3
  • White A-type star · +5
  • Supergiant · +18

Trivia

Hard to believe

  • True brightness. It pours out about 972.7 thousand times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads A0Iae — 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 luminous supergiant — among the largest and rarest stars in the galaxy.

Find it in the sky

  • How to spot it. At magnitude 9.9 you'll want a small backyard telescope, over in Dorado.
  • 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 December — 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 0.1) — 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.

Properties

absmag
-10.14
bv
0.08
constellation
Dor
luminosity
990831.9449
mag
9.86
name
HD 269781
spect
A0Iae

About HD 269781

HD 269781 is an uncommon star. It sits in the constellation Dor, shines at apparent magnitude 9.86 and has spectral type A0Iae.

Its spectrum reads A0Iae — 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 269781 in the constellation Dor. At apparent magnitude 9.86, a small backyard telescope will bring it into view.

Like any astronomical target, HD 269781 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 269781 is an uncommon star

HD 269781 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, White A-type star and Supergiant — 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.