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Trash star 13 EP

HIP 18338

RA 58.8156° · Dec 55.5051° · star

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Score breakdown

· 3 badges
13 pts · Trash
Trash 15 pts → Common
  • Hot blue B-type star +6
  • Never sets (northern circumpolar) +4
  • Star +3
Total score 13

2 more points to reach Common.

Badges

  • Star · +3
  • Never sets (northern circumpolar) · +4
  • Hot blue B-type star · +6

Trivia

Hard to believe

  • True brightness. It pours out about 158.5 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 B — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

Find it in the sky

  • How to spot it. At magnitude 11.8 you'll want a small backyard telescope, over in Camelopardalis.
  • 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 November — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out orange (B−V 0.9) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
  • 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 5110 K, against the Sun's 5778 K.

Properties

absmag
-8.17
bv
0.86
constellation
Cam
luminosity
161435.8557
mag
11.83
name
HIP 18338
spect
B

About HIP 18338

HIP 18338 is a trash star. It sits in the constellation Cam, shines at apparent magnitude 11.83 and has spectral type B.

Its spectrum reads B — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HIP 18338 in the constellation Cam. At apparent magnitude 11.83, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 18338 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 18338 is a trash star

HIP 18338 scores 13 points on Spacedle's rarity scale, which places it in the trash tier. Another 2 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, Never sets (northern circumpolar) and Hot blue B-type 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.