Trash star 14 EP

HD 149641

RA 249.5613° · Dec -46.9316° · star

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Score breakdown

· 3 badges

14 pts · Trash

Trash 15 pts → Common

Giant star +6
White A-type star +5
Star +3

Total score 14

1 more point to reach Common.

Badges

Star · +3
White A-type star · +5
Giant star · +6

Trivia

What it actually is

Spectral class. Its spectrum reads A6III — 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 giant. It has already exhausted its core hydrogen and swollen up enormously in response.

Find it in the sky

How to spot it. At magnitude 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Ara.
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 May — that's when to go looking.

Its true colour

Its true colour. Measured through blue and visual filters it comes out yellow (B−V 0.6) — almost exactly the Sun's own shade — a stellar twin in colour, if not in size.
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 5880 K, against the Sun's 5778 K.

Properties

absmag: -12.54
bv: 0.622
constellation: Ara
luminosity: 9036494.7372
mag: 7.46
name: HD 149641
spect: A6III

Nearby objects

About HD 149641

HD 149641 is a trash star. It sits in the constellation Ara, shines at apparent magnitude 7.46 and has spectral type A6III.

Its spectrum reads A6III — 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 149641 in the constellation Ara. At apparent magnitude 7.46, it is an easy target for binoculars.

Like any astronomical target, HD 149641 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 149641 is a trash star

HD 149641 scores 14 points on Spacedle's rarity scale, which places it in the trash tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Star, White A-type star and Giant 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.