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Rare variable star 49 EP

46Psi1Aur

RA 96.2246° · Dec 49.2879° · star

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Score breakdown

· 7 badges
49 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Naked-eye visible +8
  • Deep red star +8
  • Variable star +5
  • Gently variable +4
  • Orange K-type star +3
  • A named variable star +3
Total score 49

1 more point to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Orange K-type star · +3
  • Supergiant · +18
  • Deep red star · +8
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads K5Iabvar — 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 supergiant. Drop it where the Sun is and its surface would engulf the inner planets.
  • 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.

Find it in the sky

  • How to spot it. At magnitude 4.9 you can see it with your own eyes from a dark site, over in Auriga.
  • 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.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 1.9) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3270 K, against the Sun's 5778 K.

Properties

absmag
-15.08
bv
1.905
constellation
Aur
luminosity
93756200.6926
mag
4.92
name
46Psi1Aur
spect
K5Iabvar
var amplitude
0.44
var designation
Psi-1
var max
4.765
var min
5.205

About 46Psi1Aur

46Psi1Aur is a rare variable star. It sits in the constellation Aur, shines at apparent magnitude 4.92 and has spectral type K5Iabvar.

Its spectrum reads K5Iabvar — 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 46Psi1Aur in the constellation Aur. At apparent magnitude 4.92, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 46Psi1Aur 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 46Psi1Aur is a rare variable star

46Psi1Aur scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Orange K-type star, Supergiant, Deep red 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.