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Uncommon variable star 24 EP

HR 7224

RA 284.7193° · Dec 69.5313° · star

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Score breakdown

· 6 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Variable star +5
  • White A-type star +5
  • Blue-white star +5
  • Never sets (northern circumpolar) +4
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 24

10 more points to reach Rare.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • White A-type star · +5
  • Blue-white star · +5
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A0p Si — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • 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 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Draco.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around July — 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. ≈ 12.2 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-0.124
bv
-0.169
constellation
Dra
dist ly
695.4285
luminosity
97.6338
mag
6.52
name
HR 7224
spect
A0p Si
var amplitude
0.04
var designation
EE
var max
6.499
var min
6.539

About HR 7224

HR 7224 is an uncommon variable star. It lies about 695.4 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 6.52 and has spectral type A0p Si.

Its spectrum reads A0p Si — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HR 7224 in the constellation Dra. At apparent magnitude 6.52, it is an easy target for binoculars.

Like any astronomical target, HR 7224 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 HR 7224 is an uncommon variable star

HR 7224 scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), White A-type star, Blue-white 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.