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Common variable star 21 EP

HD 16761

RA 40.5031° · Dec 30.9358° · star

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Score breakdown

· 6 badges
21 pts · Common
Common 22 pts → Uncommon
  • Variable star +5
  • Subgiant (leaving the main sequence) +5
  • On the zodiac +3
  • Orange K-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 21

1 more point to reach Uncommon.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • Orange K-type star · +3
  • Subgiant (leaving the main sequence) · +5
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads K0IV — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
  • Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.
  • 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 6.8 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Aries.
  • 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 October — that's when to go looking.

Could we get there?

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

Properties

absmag
1.254
bv
1.036
constellation
Ari
dist ly
421.3903
luminosity
27.441
mag
6.81
name
HD 16761
spect
K0IV
var amplitude
0.03
var designation
AY
var max
6.796
var min
6.826

About HD 16761

HD 16761 is a common variable star. It lies about 421.4 light-years from Earth, sits in the constellation Ari, shines at apparent magnitude 6.81 and has spectral type K0IV.

Its spectrum reads K0IV — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.

How to see it

Look for HD 16761 in the constellation Ari. At apparent magnitude 6.81, it is an easy target for binoculars.

Like any astronomical target, HD 16761 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 16761 is a common variable star

HD 16761 scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, On the zodiac, Orange K-type star, Subgiant (leaving the main sequence), 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.