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Rare variable star 38 EP

Cor Caroli

RA 194.0071° · Dec 38.3184° · star

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Score breakdown

· 7 badges
38 pts · Rare
Rare 50 pts → Epic
  • Naked-eye visible +8
  • Has a proper name +8
  • Variable star +5
  • White A-type star +5
  • Blue-white star +5
  • Gently variable +4
  • A named variable star +3
Total score 38

12 more points to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Has a proper name · +8
  • White A-type star · +5
  • Blue-white star · +5
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A0spe... — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • 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 2.9 you can see it with your own eyes from a dark site, over in Canes Venatici.
  • 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 April — 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. ≈ 2 million years at Voyager 1's speed (17 km/s).

Properties

absmag
0.157
bv
-0.115
constellation
CVn
dist ly
114.8033
luminosity
75.3703
mag
2.89
name
Cor Caroli
named
yes
spect
A0spe...
var amplitude
0.08
var designation
Alp-2
var max
2.863
var min
2.943

About Cor Caroli

Cor Caroli is a rare variable star. It lies about 114.8 light-years from Earth, sits in the constellation CVn, shines at apparent magnitude 2.89 and has spectral type A0spe....

Its spectrum reads A0spe... — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for Cor Caroli in the constellation CVn. At apparent magnitude 2.89, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Cor Caroli 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 Cor Caroli is a rare variable star

Cor Caroli scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 12 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Has a proper name, White A-type star, Blue-white 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.