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Uncommon variable star 32 EP

75Sig Gem

RA 115.8280° · Dec 28.8835° · star

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Score breakdown

· 7 badges
32 pts · Uncommon
Uncommon 34 pts → Rare
  • Naked-eye visible +8
  • 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 32

2 more points to reach Rare.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • 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 K1III SB — 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 4.2 you can see it with your own eyes from a dark site, over in Gemini.
  • 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 January — that's when to go looking.

Could we get there?

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

Properties

absmag
1.312
bv
1.118
constellation
Gem
dist ly
125.06
luminosity
26.0136
mag
4.23
name
75Sig Gem
spect
K1III SB
var amplitude
0.08
var designation
Sig
var max
4.205
var min
4.285

About 75Sig Gem

75Sig Gem is an uncommon variable star. It lies about 125.1 light-years from Earth, sits in the constellation Gem, shines at apparent magnitude 4.23 and has spectral type K1III SB.

Its spectrum reads K1III SB — 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 75Sig Gem in the constellation Gem. At apparent magnitude 4.23, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 75Sig Gem 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 75Sig Gem is an uncommon variable star

75Sig Gem scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, 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.