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Rare variable star 48 EP

HD 9250

RA 23.1801° · Dec 63.5938° · star

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Score breakdown

· 7 badges
48 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Sun-like G-type star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • Gently variable +4
  • A named variable star +3
Total score 48

2 more points to reach Epic.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Never sets (northern circumpolar) · +4
  • Sun-like G-type star · +8
  • Supergiant · +18
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G0Ib — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a supergiant, hundreds of times wider 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 7.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Cassiopeia.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around October — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Properties

absmag
-1.326
bv
1.303
constellation
Cas
dist ly
1638.975
luminosity
295.3929
mag
7.18
name
HD 9250
spect
G0Ib
var amplitude
0.19
var designation
V636
var max
7.107
var min
7.297

About HD 9250

HD 9250 is a rare variable star. It lies about 1,639 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 7.18 and has spectral type G0Ib.

Its spectrum reads G0Ib — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 9250 in the constellation Cas. At apparent magnitude 7.18, it is an easy target for binoculars.

Like any astronomical target, HD 9250 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 9250 is a rare variable star

HD 9250 scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), Never sets (northern circumpolar), Sun-like G-type star, Supergiant, 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.