Trash star 13 EP

HD 72831

RA 128.4718° · Dec -33.4902° · star

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Score breakdown

· 3 badges

13 pts · Trash

Trash 15 pts → Common

White A-type star +5
Subgiant (leaving the main sequence) +5
Star +3

Total score 13

2 more points to reach Common.

Badges

Star · +3
White A-type star · +5
Subgiant (leaving the main sequence) · +5

Trivia

Hard to believe

True brightness. It pours out about 2.9 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 A0IV/V — 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.
Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.

Find it in the sky

How to spot it. At magnitude 8.7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Pyxis.
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 January — 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.

Properties

absmag: -11.32
bv: 0.124
constellation: Pyx
luminosity: 2937649.652
mag: 8.68
name: HD 72831
spect: A0IV/V

Nearby objects

About HD 72831

HD 72831 is a trash star. It sits in the constellation Pyx, shines at apparent magnitude 8.68 and has spectral type A0IV/V.

Its spectrum reads A0IV/V — 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 72831 in the constellation Pyx. At apparent magnitude 8.68, it is an easy target for binoculars.

Like any astronomical target, HD 72831 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 72831 is a trash star

HD 72831 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, White A-type star and Subgiant (leaving the main sequence) — 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.