Epic variable star 52 EP

HD 207757

RA 327.7582° · Dec 12.6256° · star

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Score breakdown

· 5 badges

52 pts · Epic

Epic 78 pts → Anomaly

Wolf-Rayet star (shedding itself) +34
Giant star +6
Variable star +5
Gently variable +4
A named variable star +3

Total score 52

26 more points to reach Anomaly.

Badges

Variable star · +5
Wolf-Rayet star (shedding itself) · +34
Giant star · +6
Gently variable · +4
A named variable star · +3

Trivia

Hard to believe

True brightness. It pours out about 3.5 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 WN6 + M3III — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.
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 8.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Pegasus.
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 orange (B−V 1.2) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.

By the numbers

Surface temperature. Its colour puts the surface at roughly 4390 K, against the Sun's 5778 K.

Properties

absmag: -11.52
bv: 1.158
constellation: Peg
luminosity: 3531831.6979
mag: 8.48
name: HD 207757
spect: WN6 + M3III
var amplitude: 0.47
var designation: AG
var max: 8.288
var min: 8.758

Nearby objects

About HD 207757

HD 207757 is an epic variable star. It sits in the constellation Peg, shines at apparent magnitude 8.48 and has spectral type WN6 + M3III.

Its spectrum reads WN6 + M3III — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.

How to see it

Look for HD 207757 in the constellation Peg. At apparent magnitude 8.48, it is an easy target for binoculars.

Like any astronomical target, HD 207757 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 207757 is an epic variable star

HD 207757 scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Wolf-Rayet star (shedding itself), Giant 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.