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Common variable star 21 EP

HD 196818

RA 312.4052° · Dec -80.1336° · star

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Score breakdown

· 5 badges
21 pts · Common
Common 22 pts → Uncommon
  • Giant star +6
  • Variable star +5
  • Gently variable +4
  • Orange K-type star +3
  • A named variable star +3
Total score 21

1 more point to reach Uncommon.

Badges

  • Variable star · +5
  • Orange K-type star · +3
  • Giant star · +6
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads K0IIIp — 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 a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • 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 7.9 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Octans.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • 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
1.303
bv
1.077
constellation
Oct
dist ly
683.7652
luminosity
26.2301
mag
7.91
name
HD 196818
spect
K0IIIp
var amplitude
0.22
var designation
CF
var max
7.764
var min
7.984

About HD 196818

HD 196818 is a common variable star. It lies about 683.8 light-years from Earth, sits in the constellation Oct, shines at apparent magnitude 7.91 and has spectral type K0IIIp.

Its spectrum reads K0IIIp — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.

How to see it

Look for HD 196818 in the constellation Oct. At apparent magnitude 7.91, it is an easy target for binoculars.

Like any astronomical target, HD 196818 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 196818 is a common variable star

HD 196818 scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Orange K-type star, 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.