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Rare variable star 40 EP

HIP 25540

RA 81.9097° · Dec 11.4275° · star

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Score breakdown

· 7 badges
40 pts · Rare
Rare 50 pts → Epic
  • Strongly variable +10
  • Sun-like G-type star +8
  • Distant (over 1,000 light-years) +6
  • In Orion's hunting ground +6
  • Variable star +5
  • A named variable star +3
  • Main-sequence star +2
Total score 40

10 more points to reach Epic.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • In Orion's hunting ground · +6
  • Sun-like G-type star · +8
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G5Vpe — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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 10.6 you'll want a small backyard telescope, over in Orion.
  • Northern sky. It rides the northern half of the sky — an easier target the further north 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. Impossible with our current technology — and the next millennium of it.

Properties

absmag
3.076
bv
0.988
constellation
Ori
dist ly
1062.3974
luminosity
5.1239
mag
10.64
name
HIP 25540
spect
G5Vpe
var amplitude
1.28
var designation
CO
var max
10.325
var min
11.605

About HIP 25540

HIP 25540 is a rare variable star. It lies about 1,062.4 light-years from Earth, sits in the constellation Ori, shines at apparent magnitude 10.64 and has spectral type G5Vpe.

Its spectrum reads G5Vpe — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HIP 25540 in the constellation Ori. At apparent magnitude 10.64, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 25540 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 25540 is a rare variable star

HIP 25540 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), In Orion's hunting ground, Sun-like G-type star, Main-sequence 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.