← Back to dex
Rare star 41 EP

HD 9974

RA 24.7318° · Dec 58.1563° · star

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 3 badges
41 pts · Rare
Rare 50 pts → Epic
  • Wolf-Rayet star (shedding itself) +34
  • Never sets (northern circumpolar) +4
  • Star +3
Total score 41

9 more points to reach Epic.

Badges

  • Star · +3
  • Never sets (northern circumpolar) · +4
  • Wolf-Rayet star (shedding itself) · +34

Trivia

Hard to believe

  • True brightness. It pours out about 461.3 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 WN3+... — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.

Find it in the sky

  • How to spot it. At magnitude 10.7 you'll want a small backyard telescope, over in Cassiopeia.
  • 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 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) — 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 9910 K, against the Sun's 5778 K.

Properties

absmag
-9.33
bv
0.018
constellation
Cas
luminosity
469894.1086
mag
10.67
name
HD 9974
spect
WN3+...

About HD 9974

HD 9974 is a rare star. It sits in the constellation Cas, shines at apparent magnitude 10.67 and has spectral type WN3+....

Its spectrum reads WN3+... — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.

How to see it

Look for HD 9974 in the constellation Cas. At apparent magnitude 10.67, a small backyard telescope will bring it into view.

Like any astronomical target, HD 9974 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 9974 is a rare star

HD 9974 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, Never sets (northern circumpolar) and Wolf-Rayet star (shedding itself) — 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.