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Trash variable star 13 EP

HD 19684

RA 47.9952° · Dec 46.1286° · star

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Score breakdown

· 4 badges
13 pts · Trash
Trash 15 pts → Common
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 13

2 more points to reach Common.

Badges

  • Variable star · +5
  • Yellow-white F-type star · +3
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F0 — 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.

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 7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Perseus.
  • 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 November — 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. ≈ 6.4 million years at Voyager 1's speed (17 km/s).

Properties

absmag
1.731
bv
0.301
constellation
Per
dist ly
362.3955
luminosity
17.6848
mag
6.96
name
HD 19684
spect
F0
var amplitude
0.03
var designation
V889
var max
6.949
var min
6.979

About HD 19684

HD 19684 is a trash variable star. It lies about 362.4 light-years from Earth, sits in the constellation Per, shines at apparent magnitude 6.96 and has spectral type F0.

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

How to see it

Look for HD 19684 in the constellation Per. At apparent magnitude 6.96, it is an easy target for binoculars.

Like any astronomical target, HD 19684 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 19684 is a trash variable star

HD 19684 scores 13 points on Spacedle's rarity scale, which places it in the trash tier. Another 2 points would lift it into a rarer tier.

That score comes from 4 science badges — Variable star, Yellow-white F-type star, Barely variable (under 0.05 mag) 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.