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Rare variable star 40 EP

HD 144921

RA 241.8636° · Dec 24.9083° · star

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Score breakdown

· 6 badges
40 pts · Rare
Rare 50 pts → Epic
  • Strongly variable +10
  • Sun-like G-type star +8
  • Deep red star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • A named variable star +3
Total score 40

10 more points to reach Epic.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Sun-like G-type star · +8
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G3pe-K0(M3) — 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 8.3 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Hercules.
  • 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 May — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 36 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-0.653
bv
1.563
constellation
Her
dist ly
2051.2955
luminosity
158.9278
mag
8.34
name
HD 144921
spect
G3pe-K0(M3)
var amplitude
0.74
var designation
SX
var max
8.098
var min
8.838

About HD 144921

HD 144921 is a rare variable star. It lies about 2,051.3 light-years from Earth, sits in the constellation Her, shines at apparent magnitude 8.34 and has spectral type G3pe-K0(M3).

Its spectrum reads G3pe-K0(M3) — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 144921 in the constellation Her. At apparent magnitude 8.34, it is an easy target for binoculars.

Like any astronomical target, HD 144921 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 144921 is a rare variable star

HD 144921 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Distant (over 1,000 light-years), Sun-like G-type star, Deep red 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.