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Uncommon variable star 22 EP

HD 128575

RA 220.6767° · Dec -74.3115° · star

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Score breakdown

· 5 badges
22 pts · Uncommon
Uncommon 34 pts → Rare
  • Sun-like G-type star +8
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 22

12 more points to reach Rare.

Badges

  • Variable star · +5
  • Sun-like G-type star · +8
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G3/G5V — a G-type star: the very same spectral class as our own 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.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 8.4 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Apus.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around May — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Getting there

  • Aboard Voyager 1. ≈ 3.1 million years at Voyager 1's speed (17 km/s).

Properties

absmag
4.8
bv
0.63
constellation
Aps
dist ly
175.1644
luminosity
1.0471
mag
8.45
name
HD 128575
spect
G3/G5V
var amplitude
0.46
var designation
NT
var max
8.312
var min
8.772

About HD 128575

HD 128575 is an uncommon variable star. It lies about 175.2 light-years from Earth, sits in the constellation Aps, shines at apparent magnitude 8.45 and has spectral type G3/G5V.

Its spectrum reads G3/G5V — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 128575 in the constellation Aps. At apparent magnitude 8.45, it is an easy target for binoculars.

Like any astronomical target, HD 128575 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 128575 is an uncommon variable star

HD 128575 scores 22 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 12 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Sun-like G-type star, Main-sequence star, Gently 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.