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Uncommon star 26 EP

HD 7583

RA 18.3771° · Dec -73.3362° · 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 704.7 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 A0Ia0 — 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 10.2 you'll want a small backyard telescope, over in Tucana.
  • 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 October — 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
-9.79
bv
0.138
constellation
Tuc
luminosity
717794.2913
mag
10.21
name
HD 7583
spect
A0Ia0

About HD 7583

HD 7583 is an uncommon star. It sits in the constellation Tuc, shines at apparent magnitude 10.21 and has spectral type A0Ia0.

Its spectrum reads A0Ia0 — 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 7583 in the constellation Tuc. At apparent magnitude 10.21, a small backyard telescope will bring it into view.

Like any astronomical target, HD 7583 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 7583 is an uncommon star

HD 7583 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.