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Uncommon variable star 24 EP

HD 198141

RA 312.2321° · Dec -20.6190° · star

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Score breakdown

· 6 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Giant star +6
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • Orange K-type star +3
  • A named variable star +3
Total score 24

10 more points to reach Rare.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • 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 K2III + F/G — 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 Capricornus.
  • 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 August — that's when to go looking.

Could we get there?

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

Properties

absmag
4.603
bv
0.745
constellation
Cap
dist ly
254.0155
luminosity
1.2555
mag
9.06
name
HD 198141
spect
K2III + F/G
var amplitude
0.26
var designation
BM
var max
9.015
var min
9.275

About HD 198141

HD 198141 is an uncommon variable star. It lies about 254 light-years from Earth, sits in the constellation Cap, shines at apparent magnitude 9.06 and has spectral type K2III + F/G.

Its spectrum reads K2III + F/G — 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 198141 in the constellation Cap. At apparent magnitude 9.06, a small backyard telescope will bring it into view.

Like any astronomical target, HD 198141 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 198141 is an uncommon variable star

HD 198141 scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, On the zodiac, 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.