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Uncommon variable star 25 EP

HR 1837

RA 82.5830° · Dec 4.2048° · star

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Score breakdown

· 6 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • In Orion's hunting ground +6
  • Giant star +6
  • Variable star +5
  • Orange K-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 25

9 more points to reach Rare.

Badges

  • Variable star · +5
  • In Orion's hunting ground · +6
  • Orange K-type star · +3
  • Giant star · +6
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads K2IIIvar — 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 6.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Orion.
  • 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 December — that's when to go looking.

Could we get there?

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

Properties

absmag
0.108
bv
1.28
constellation
Ori
dist ly
541.7875
luminosity
78.8497
mag
6.21
name
HR 1837
spect
K2IIIvar
var amplitude
0.03
var designation
CK
var max
6.196
var min
6.226

About HR 1837

HR 1837 is an uncommon variable star. It lies about 541.8 light-years from Earth, sits in the constellation Ori, shines at apparent magnitude 6.21 and has spectral type K2IIIvar.

Its spectrum reads K2IIIvar — 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 HR 1837 in the constellation Ori. At apparent magnitude 6.21, it is an easy target for binoculars.

Like any astronomical target, HR 1837 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 HR 1837 is an uncommon variable star

HR 1837 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, In Orion's hunting ground, Orange K-type star, Giant star, Barely variable (under 0.05 mag) 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.