Uncommon variable star 33 EP

HD 177300

RA 286.6588° · Dec -51.4176° · star

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Score breakdown

· 5 badges

33 pts · Uncommon

Uncommon 34 pts → Rare

Supergiant +18
Variable star +5
Gently variable +4
Yellow-white F-type star +3
A named variable star +3

Total score 33

1 more point to reach Rare.

Badges

Variable star · +5
Yellow-white F-type star · +3
Supergiant · +18
Gently variable · +4
A named variable star · +3

Trivia

What it actually is

Spectral class. Its spectrum reads F4Ib — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Where it is in life. It is a supergiant, hundreds of times wider than the Sun.
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 7.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Telescopium.
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 July — that's when to go looking.

Its true colour

Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.5) — a shade brighter and crisper than our own Sun.
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: -12.81
bv: 0.523
constellation: Tel
luminosity: 11587773.5616
mag: 7.19
name: HD 177300
spect: F4Ib
var amplitude: 0.4
var designation: BL
var max: 7.095
var min: 7.495

Nearby objects

About HD 177300

HD 177300 is an uncommon variable star. It sits in the constellation Tel, shines at apparent magnitude 7.19 and has spectral type F4Ib.

Its spectrum reads F4Ib — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 177300 in the constellation Tel. At apparent magnitude 7.19, it is an easy target for binoculars.

Like any astronomical target, HD 177300 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 177300 is an uncommon variable star

HD 177300 scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Yellow-white F-type star, Supergiant, 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.