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Trash star 11 EP

HD 188934

RA 299.4068° · Dec 0.2417° · star

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Score breakdown

· 2 badges
11 pts · Trash
Trash 15 pts → Common
  • Deep red star +8
  • Star +3
Total score 11

4 more points to reach Common.

Badges

  • Star · +3
  • Deep red star · +8

Trivia

Hard to believe

  • True brightness. It pours out about 1.5 million 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 R... — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

Find it in the sky

  • How to spot it. At magnitude 9.4 you'll want a small backyard telescope, over in Aquila.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • 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 deep orange-red (B−V 2) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3130 K, against the Sun's 5778 K.

What's in a name

  • Its catalogue. The HD number is from the Henry Draper Catalogue, in which Annie Jump Cannon personally classified the spectra of nearly 400,000 stars — still the largest such feat by one person.

Properties

absmag
-10.64
bv
2.039
constellation
Aql
luminosity
1570362.8043
mag
9.36
name
HD 188934
spect
R...

Nearby objects

About HD 188934

HD 188934 is a trash star. It sits in the constellation Aql, shines at apparent magnitude 9.36 and has spectral type R....

Its spectrum reads R... — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

How to see it

Look for HD 188934 in the constellation Aql. At apparent magnitude 9.36, a small backyard telescope will bring it into view.

Like any astronomical target, HD 188934 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 188934 is a trash star

HD 188934 scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.

That score comes from 2 science badges — Star and Deep red 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.