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Rare star 35 EP

HIP 97520

RA 297.3105° · Dec 26.7941° · star

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Score breakdown

· 3 badges
35 pts · Rare
Rare 50 pts → Epic
  • Blazing O-type star +26
  • Giant star +6
  • Star +3
Total score 35

15 more points to reach Epic.

Badges

  • Star · +3
  • Blazing O-type star · +26
  • Giant star · +6

Trivia

Hard to believe

  • True brightness. It pours out about 237.7 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 O9.5III — 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 a giant. It has already exhausted its core hydrogen and swollen up enormously in response.

Find it in the sky

  • How to spot it. At magnitude 11.4 you'll want a small backyard telescope, over in Vulpecula.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out yellow (B−V 0.8) — almost exactly the Sun's own shade — a stellar twin in colour, if not in size.
  • 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
-8.61
bv
0.781
constellation
Vul
luminosity
242102.9047
mag
11.39
name
HIP 97520
spect
O9.5III

About HIP 97520

HIP 97520 is a rare star. It sits in the constellation Vul, shines at apparent magnitude 11.39 and has spectral type O9.5III.

Its spectrum reads O9.5III — 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 97520 in the constellation Vul. At apparent magnitude 11.39, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 97520 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 97520 is a rare star

HIP 97520 scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, Blazing O-type star and Giant 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.