Common variable star 20 EP

HIP 107983

RA 328.1421° · Dec 47.2288° · star

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Score breakdown

· 5 badges

20 pts · Common

Common 22 pts → Uncommon

Hot blue B-type star +6
Variable star +5
Gently variable +4
A named variable star +3
Main-sequence star +2

Total score 20

2 more points to reach Uncommon.

Badges

Variable star · +5
Hot blue B-type star · +6
Main-sequence star · +2
Gently variable · +4
A named variable star · +3

Trivia

Hard to believe

True brightness. It pours out about 751.6 thousand 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 B9.5Ve — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
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 10.1 you'll want a small backyard telescope, over in Cygnus.
Northern sky. It rides the northern half of the sky — an easier target the further north you are.
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 yellow-white (B−V 0.4) — a shade brighter and crisper than our own Sun.

Properties

absmag: -9.86
bv: 0.436
constellation: Cyg
luminosity: 765596.6069
mag: 10.14
name: HIP 107983
spect: B9.5Ve
var amplitude: 0.11
var designation: V1578
var max: 10.095
var min: 10.205

Nearby objects

About HIP 107983

HIP 107983 is a common variable star. It sits in the constellation Cyg, shines at apparent magnitude 10.14 and has spectral type B9.5Ve.

Its spectrum reads B9.5Ve — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HIP 107983 in the constellation Cyg. At apparent magnitude 10.14, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 107983 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 HIP 107983 is a common variable star

HIP 107983 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Hot blue B-type star, Main-sequence star, 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.