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Uncommon variable star 26 EP

HD 50949

RA 104.3224° · Dec 41.1177° · star

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Score breakdown

· 4 badges
26 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Deep red star +8
  • Variable star +5
  • A named variable star +3
Total score 26

8 more points to reach Rare.

Badges

  • Variable star · +5
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 1 million times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads R6pv — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • 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 9.8 you'll want a small backyard telescope, 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 January — 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 1.6) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3650 K, against the Sun's 5778 K.

Properties

absmag
-10.2
bv
1.6
constellation
Aur
luminosity
1047128.5481
mag
9.8
name
HD 50949
spect
R6pv
var amplitude
0.8
var designation
UW
var max
9.689
var min
10.489

About HD 50949

HD 50949 is an uncommon variable star. It sits in the constellation Aur, shines at apparent magnitude 9.8 and has spectral type R6pv.

Its spectrum reads R6pv — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

How to see it

Look for HD 50949 in the constellation Aur. At apparent magnitude 9.8, a small backyard telescope will bring it into view.

Like any astronomical target, HD 50949 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 HD 50949 is an uncommon variable star

HD 50949 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 4 science badges — Variable star, Deep red star, 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.