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Common variable star 21 EP

HD 118238

RA 204.0347° · Dec -33.4791° · 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 K2IIIp — 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 9.1 you'll want a small backyard telescope, over in Centaurus.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Could we get there?

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

Properties

absmag
1.879
bv
1.205
constellation
Cen
dist ly
886.2934
luminosity
15.4312
mag
9.05
name
HD 118238
spect
K2IIIp
var amplitude
0.18
var designation
V764
var max
8.949
var min
9.129

About HD 118238

HD 118238 is a common variable star. It lies about 886.3 light-years from Earth, sits in the constellation Cen, shines at apparent magnitude 9.05 and has spectral type K2IIIp.

Its spectrum reads K2IIIp — 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 118238 in the constellation Cen. At apparent magnitude 9.05, a small backyard telescope will bring it into view.

Like any astronomical target, HD 118238 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 118238 is a common variable star

HD 118238 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.