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Rare star 36 EP

HIP 82436

RA 252.7089° · Dec -74.5385° · star

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Score breakdown

· 4 badges
36 pts · Rare
Rare 50 pts → Epic
  • Blazing O-type star +26
  • Blue-white star +5
  • Star +3
  • Main-sequence star +2
Total score 36

14 more points to reach Epic.

Badges

  • Star · +3
  • Blazing O-type star · +26
  • Main-sequence star · +2
  • Blue-white star · +5

Trivia

Hard to believe

  • True brightness. It pours out about 731.1 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 O9.5V — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.

Find it in the sky

  • How to spot it. At magnitude 10.2 you'll want a small backyard telescope, over in Apus.
  • 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 June — 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 -0.2) — 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.

Properties

absmag
-9.83
bv
-0.17
constellation
Aps
luminosity
744731.9739
mag
10.17
name
HIP 82436
spect
O9.5V

About HIP 82436

HIP 82436 is a rare star. It sits in the constellation Aps, shines at apparent magnitude 10.17 and has spectral type O9.5V.

Its spectrum reads O9.5V — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.

How to see it

Look for HIP 82436 in the constellation Aps. At apparent magnitude 10.17, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 82436 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 HIP 82436 is a rare star

HIP 82436 scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Blazing O-type star, Main-sequence star 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.