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Common variable star 21 EP

HD 64191

RA 118.1966° · Dec 1.5974° · 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
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 21

1 more point to reach Uncommon.

Badges

  • Variable star · +5
  • Yellow-white F-type star · +3
  • Giant star · +6
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F0IIIvar — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 9.3 you'll want a small backyard telescope, over in Canis Minor.
  • 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 January — that's when to go looking.

Could we get there?

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

Properties

absmag
3.261
bv
0.25
constellation
CMi
dist ly
528.616
luminosity
4.3212
mag
9.31
name
HD 64191
spect
F0IIIvar
var amplitude
0.32
var designation
AD
var max
9.213
var min
9.533

About HD 64191

HD 64191 is a common variable star. It lies about 528.6 light-years from Earth, sits in the constellation CMi, shines at apparent magnitude 9.31 and has spectral type F0IIIvar.

Its spectrum reads F0IIIvar — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 64191 in the constellation CMi. At apparent magnitude 9.31, a small backyard telescope will bring it into view.

Like any astronomical target, HD 64191 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 64191 is a common variable star

HD 64191 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, Yellow-white F-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.