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Uncommon variable star 25 EP

HD 206155

RA 325.0078° · Dec 9.1848° · star

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Score breakdown

· 5 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Variable star +5
  • White A-type star +5
  • A named variable star +3
  • Main-sequence star +2
Total score 25

9 more points to reach Rare.

Badges

  • Variable star · +5
  • White A-type star · +5
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A7Vvar — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • 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.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around August — that's when to go looking.

Could we get there?

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

Properties

absmag
0.415
bv
0.12
constellation
Peg
dist ly
664.2689
luminosity
59.4292
mag
6.96
name
HD 206155
spect
A7Vvar
var amplitude
0.58
var designation
EE
var max
6.943
var min
7.523

About HD 206155

HD 206155 is an uncommon variable star. It lies about 664.3 light-years from Earth, sits in the constellation Peg, shines at apparent magnitude 6.96 and has spectral type A7Vvar.

Its spectrum reads A7Vvar — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 206155 in the constellation Peg. At apparent magnitude 6.96, it is an easy target for binoculars.

Like any astronomical target, HD 206155 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 206155 is an uncommon variable star

HD 206155 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, White A-type star, Main-sequence star, Strongly 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.