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Uncommon variable star 31 EP

HD 104425

RA 180.3880° · Dec 43.0417° · star

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Score breakdown

· 6 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Bright giant +12
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • Gently variable +4
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 31

3 more points to reach Rare.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • Yellow-white F-type star · +3
  • Bright giant · +12
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F6II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 8.8 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Ursa Major.
  • 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 March — that's when to go looking.

Could we get there?

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

Properties

absmag
3.057
bv
0.485
constellation
UMa
dist ly
469.9654
luminosity
5.2143
mag
8.85
name
HD 104425
spect
F6II
var amplitude
0.2
var designation
HX
var max
8.75
var min
8.95

About HD 104425

HD 104425 is an uncommon variable star. It lies about 470 light-years from Earth, sits in the constellation UMa, shines at apparent magnitude 8.85 and has spectral type F6II.

Its spectrum reads F6II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 104425 in the constellation UMa. At apparent magnitude 8.85, it is an easy target for binoculars.

Like any astronomical target, HD 104425 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 104425 is an uncommon variable star

HD 104425 scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), Yellow-white F-type star, Bright giant, 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.