← Back to dex
Epic variable star 63 EP

Bet Dor

RA 83.4063° · Dec -62.4898° · star

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 8 badges
63 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Intrinsically luminous (Mv < −2) +10
  • Strongly variable +10
  • Naked-eye visible +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 63

15 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Naked-eye visible · +8
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Intrinsically luminous (Mv < −2) · +10
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F6Ia — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a luminous supergiant — among the largest and rarest stars in the galaxy.
  • 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 3.8 you can see it with your own eyes from a dark site, over in Dorado.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • 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
-3.687
bv
0.64
constellation
Dor
dist ly
1006.6544
luminosity
2598.9624
mag
3.76
name
Bet Dor
spect
F6Ia
var amplitude
0.68
var designation
Bet
var max
3.407
var min
4.087

About Bet Dor

Bet Dor is an epic variable star. It lies about 1,006.7 light-years from Earth, sits in the constellation Dor, shines at apparent magnitude 3.76 and has spectral type F6Ia.

Its spectrum reads F6Ia — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for Bet Dor in the constellation Dor. At apparent magnitude 3.76, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Bet Dor 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 Bet Dor is an epic variable star

Bet Dor scores 63 points on Spacedle's rarity scale, which places it in the epic tier. Another 15 points would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, Distant (over 1,000 light-years), Naked-eye visible, Yellow-white F-type star, Supergiant, Intrinsically luminous (Mv < −2), 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.