Trash star 11 EP

HD 215312

RA 341.0497° · Dec -0.9535° · star

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Score breakdown

· 3 badges

11 pts · Trash

Trash 15 pts → Common

White A-type star +5
Star +3
On the zodiac +3

Total score 11

4 more points to reach Common.

Badges

Star · +3
On the zodiac · +3
White A-type star · +5

Trivia

Hard to believe

True brightness. It pours out about 2.2 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 A3 — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

Find it in the sky

How to spot it. At magnitude 9 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Aquarius.
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 August — 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 0.3) — 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 7560 K, against the Sun's 5778 K.

Properties

absmag: -11.01
bv: 0.285
constellation: Aqr
luminosity: 2208004.733
mag: 8.99
name: HD 215312
spect: A3

Nearby objects

About HD 215312

HD 215312 is a trash star. It sits in the constellation Aqr, shines at apparent magnitude 8.99 and has spectral type A3.

Its spectrum reads A3 — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 215312 in the constellation Aqr. At apparent magnitude 8.99, it is an easy target for binoculars.

Like any astronomical target, HD 215312 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 215312 is a trash star

HD 215312 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 3 science badges — Star, On the zodiac and White A-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.