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Common variable star 21 EP

HIP 22750

RA 73.4063° · Dec -19.4336° · star

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Score breakdown

· 4 badges
21 pts · Common
Common 22 pts → Uncommon
  • Strongly variable +10
  • Variable star +5
  • 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
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F4 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 11.7 you'll want a small backyard telescope, over in Eridanus.
  • 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 December — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 13.2 million years at Voyager 1's speed (17 km/s).

Properties

absmag
4.902
constellation
Eri
dist ly
749.784
luminosity
0.9532
mag
11.71
name
HIP 22750
spect
F4
var amplitude
0.92
var designation
BB
var max
10.977
var min
11.897

About HIP 22750

HIP 22750 is a common variable star. It lies about 749.8 light-years from Earth, sits in the constellation Eri, shines at apparent magnitude 11.71 and has spectral type F4.

Its spectrum reads F4 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HIP 22750 in the constellation Eri. At apparent magnitude 11.71, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 22750 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 HIP 22750 is a common variable star

HIP 22750 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 4 science badges — Variable star, Yellow-white F-type 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.