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Rare variable star 36 EP

HD 158443

RA 262.7016° · Dec -33.6099° · star

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Score breakdown

· 6 badges
36 pts · Rare
Rare 50 pts → Epic
  • Bright giant +12
  • Strongly variable +10
  • Variable star +5
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 36

14 more points to reach Epic.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • 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 F8/G0II — 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 7.9 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Scorpius.
  • 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 June — 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 5010 K, against the Sun's 5778 K.

Properties

absmag
-12.1
bv
0.894
constellation
Sco
luminosity
6025595.8607
mag
7.9
name
HD 158443
spect
F8/G0II
var amplitude
0.66
var designation
V482
var max
7.677
var min
8.337

About HD 158443

HD 158443 is a rare variable star. It sits in the constellation Sco, shines at apparent magnitude 7.9 and has spectral type F8/G0II.

Its spectrum reads F8/G0II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 158443 in the constellation Sco. At apparent magnitude 7.9, it is an easy target for binoculars.

Like any astronomical target, HD 158443 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 158443 is a rare variable star

HD 158443 scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, On the zodiac, 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.