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Uncommon variable star 33 EP

HD 118769

RA 205.0777° · Dec -57.6132° · star

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Bright giant +12
  • Strongly variable +10
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 33

1 more point to reach Rare.

Badges

  • Variable star · +5
  • Yellow-white F-type star · +3
  • Bright giant · +12
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F7/F8II — 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 7.8 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Centaurus.
  • 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 April — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out orange (B−V 0.9) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
  • 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.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 4950 K, against the Sun's 5778 K.

Properties

absmag
-12.18
bv
0.918
constellation
Cen
luminosity
6486344.3355
mag
7.82
name
HD 118769
spect
F7/F8II
var amplitude
0.93
var designation
XX
var max
7.304
var min
8.234

About HD 118769

HD 118769 is an uncommon variable star. It sits in the constellation Cen, shines at apparent magnitude 7.82 and has spectral type F7/F8II.

Its spectrum reads F7/F8II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 118769 in the constellation Cen. At apparent magnitude 7.82, it is an easy target for binoculars.

Like any astronomical target, HD 118769 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 118769 is an uncommon variable star

HD 118769 scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

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