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Uncommon variable star 23 EP

HD 225041

RA 0.7004° · Dec -24.9453° · star

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Score breakdown

· 5 badges
23 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 23

11 more points to reach Rare.

Badges

  • Variable star · +5
  • Yellow-white F-type star · +3
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 648.6 thousand 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 F0/F2V — 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 10.3 you'll want a small backyard telescope, over in Sculptor.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.3) — hotter and whiter than the Sun, the colour of Sirius or Vega.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

Properties

absmag
-9.7
bv
0.254
constellation
Scl
luminosity
660693.448
mag
10.3
name
HD 225041
spect
F0/F2V
var amplitude
1.16
var designation
RU
var max
9.411
var min
10.571

About HD 225041

HD 225041 is an uncommon variable star. It sits in the constellation Scl, shines at apparent magnitude 10.3 and has spectral type F0/F2V.

Its spectrum reads F0/F2V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 225041 in the constellation Scl. At apparent magnitude 10.3, a small backyard telescope will bring it into view.

Like any astronomical target, HD 225041 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 225041 is an uncommon variable star

HD 225041 scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Yellow-white F-type star, Main-sequence 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.