Uncommon variable star 27 EP

HD 137626

RA 232.7076° · Dec -65.5993° · star

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Score breakdown

· 5 badges

27 pts · Uncommon

Uncommon 34 pts → Rare

Bright giant +12
Variable star +5
Gently variable +4
Yellow-white F-type star +3
A named variable star +3

Total score 27

7 more points to reach Rare.

Badges

Variable star · +5
Yellow-white F-type star · +3
Bright giant · +12
Gently variable · +4
A named variable star · +3

Trivia

What it actually is

Spectral class. Its spectrum reads F8II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Where it is in life. It is a bright giant, well on its way to the largest stars there are.
It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Find it in the sky

How to spot it. At magnitude 7.8 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Triangulum Australe.
Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
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 0.8) — 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.

Properties

absmag: -12.19
bv: 0.808
constellation: TrA
luminosity: 6546361.7407
mag: 7.81
name: HD 137626
spect: F8II
var amplitude: 0.17
var designation: LR
var max: 7.715
var min: 7.885

Nearby objects

About HD 137626

HD 137626 is an uncommon variable star. It sits in the constellation TrA, shines at apparent magnitude 7.81 and has spectral type F8II.

Its spectrum reads F8II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 137626 in the constellation TrA. At apparent magnitude 7.81, it is an easy target for binoculars.

Like any astronomical target, HD 137626 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 137626 is an uncommon variable star

HD 137626 scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Yellow-white F-type star, Bright giant, Gently variable and A named variable 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.