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Rare variable star 43 EP

HD 237190

RA 58.5907° · Dec 58.6533° · star

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Score breakdown

· 6 badges
43 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Strongly variable +10
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 43

7 more points to reach Epic.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Strongly variable · +10
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 3 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 F5-G1Ib + A: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 8.6 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Camelopardalis.
  • 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 November — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out orange (B−V 1.3) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 4140 K, against the Sun's 5778 K.

Properties

absmag
-11.36
bv
1.291
constellation
Cam
luminosity
3047894.9896
mag
8.64
name
HD 237190
spect
F5-G1Ib + A:
var amplitude
0.78
var designation
RW
var max
8.201
var min
8.981

Nearby objects

About HD 237190

HD 237190 is a rare variable star. It sits in the constellation Cam, shines at apparent magnitude 8.64 and has spectral type F5-G1Ib + A:.

Its spectrum reads F5-G1Ib + A: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 237190 in the constellation Cam. At apparent magnitude 8.64, it is an easy target for binoculars.

Like any astronomical target, HD 237190 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 237190 is a rare variable star

HD 237190 scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), Yellow-white F-type star, Supergiant, 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.