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Rare star 41 EP

HD 96917

RA 167.1776° · Dec -57.0658° · star

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Score breakdown

· 3 badges
41 pts · Rare
Rare 50 pts → Epic
  • Blazing O-type star +26
  • Bright giant +12
  • Star +3
Total score 41

9 more points to reach Epic.

Badges

  • Star · +3
  • Blazing O-type star · +26
  • Bright giant · +12

Trivia

What it actually is

  • Spectral class. Its spectrum reads O9II: — 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 bright giant, well on its way to the largest stars there are.

Find it in the sky

  • How to spot it. At magnitude 7.1 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Centaurus.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • 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 0.1) — 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.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 9230 K, against the Sun's 5778 K.

Properties

absmag
-12.91
bv
0.08
constellation
Cen
luminosity
12705741.0521
mag
7.09
name
HD 96917
spect
O9II:

About HD 96917

HD 96917 is a rare star. It sits in the constellation Cen, shines at apparent magnitude 7.09 and has spectral type O9II:.

Its spectrum reads O9II: — 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 HD 96917 in the constellation Cen. At apparent magnitude 7.09, it is an easy target for binoculars.

Like any astronomical target, HD 96917 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 96917 is a rare star

HD 96917 scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, Blazing O-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.