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Common variable star 20 EP

HD 222317

RA 354.8790° · Dec 28.2465° · star

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Score breakdown

· 5 badges
20 pts · Common
Common 22 pts → Uncommon
  • Sun-like G-type star +8
  • Variable star +5
  • A named variable star +3
  • Main-sequence star +2
  • Barely variable (under 0.05 mag) +2
Total score 20

2 more points to reach Uncommon.

Badges

  • Variable star · +5
  • Sun-like G-type star · +8
  • Main-sequence star · +2
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G2V — a G-type star: the very same spectral class as our own Sun.
  • 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.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 7 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 September — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
3.553
bv
0.658
constellation
Peg
dist ly
162.5092
luminosity
3.3022
mag
7.04
name
HD 222317
spect
G2V
var amplitude
0.04
var designation
KT
var max
7.025
var min
7.065

About HD 222317

HD 222317 is a common variable star. It lies about 162.5 light-years from Earth, sits in the constellation Peg, shines at apparent magnitude 7.04 and has spectral type G2V.

Its spectrum reads G2V — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 222317 in the constellation Peg. At apparent magnitude 7.04, it is an easy target for binoculars.

Like any astronomical target, HD 222317 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 222317 is a common variable star

HD 222317 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, Sun-like G-type star, Main-sequence star, Barely variable (under 0.05 mag) 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.