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Common variable star 19 EP

HR 7222

RA 285.9270° · Dec 21.2684° · star

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Score breakdown

· 5 badges
19 pts · Common
Common 22 pts → Uncommon
  • Giant star +6
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 19

3 more points to reach Uncommon.

Badges

  • Variable star · +5
  • Yellow-white F-type star · +3
  • Giant star · +6
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F2III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • 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 6.6 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Sagitta.
  • 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 July — that's when to go looking.

Could we get there?

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

Properties

absmag
1.315
bv
0.323
constellation
Sge
dist ly
373.6035
luminosity
25.9418
mag
6.61
name
HR 7222
spect
F2III
var amplitude
0.04
var designation
LT
var max
6.587
var min
6.627

About HR 7222

HR 7222 is a common variable star. It lies about 373.6 light-years from Earth, sits in the constellation Sge, shines at apparent magnitude 6.61 and has spectral type F2III.

Its spectrum reads F2III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HR 7222 in the constellation Sge. At apparent magnitude 6.61, it is an easy target for binoculars.

Like any astronomical target, HR 7222 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 7222 is a common variable star

HR 7222 scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Yellow-white F-type star, Giant 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.