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Rare variable star 49 EP

61 Cyg

RA 316.7219° · Dec 38.7494° · star

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Score breakdown

· 8 badges
49 pts · Rare
Rare 50 pts → Epic
  • Nearby (<25 ly) +12
  • Strongly variable +10
  • Naked-eye visible +8
  • Binary star +6
  • Variable star +5
  • Orange K-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 49

1 more point to reach Epic.

Badges

  • Variable star · +5
  • Nearby (<25 ly) · +12
  • Naked-eye visible · +8
  • Binary star · +6
  • Orange K-type star · +3
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What makes it special

  • Not one star but two. It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

What it actually is

  • Spectral class. Its spectrum reads K5V — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions 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.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 5.2 you can see it with your own eyes from a dark site, 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.

Properties

absmag
7.488
binary
yes
bv
1.069
constellation
Cyg
dist ly
11.3714
luminosity
0.0881
mag
5.2
name
61 Cyg
spect
K5V
var amplitude
0.68
var designation
V1803
var max
5.002
var min
5.682

About 61 Cyg

61 Cyg is a rare variable star. It lies about 11.4 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 5.2 and has spectral type K5V.

It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

How to see it

Look for 61 Cyg in the constellation Cyg. At apparent magnitude 5.2, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 61 Cyg 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 61 Cyg is a rare variable star

61 Cyg scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, Nearby (<25 ly), Naked-eye visible, Binary star, Orange K-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.