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Uncommon star 32 EP

HD 101766

RA 175.4774° · Dec -75.1180° · star

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Score breakdown

· 4 badges
32 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • Deep red star +8
  • Star +3
  • Orange K-type star +3
Total score 32

2 more points to reach Rare.

Badges

  • Star · +3
  • Orange K-type star · +3
  • Supergiant · +18
  • Deep red star · +8

Trivia

Hard to believe

  • True brightness. It pours out about 4.6 million times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads K2Ib/II — 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 supergiant, hundreds of times wider than the Sun.

Find it in the sky

  • How to spot it. At magnitude 8.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Musca.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around March — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 1.5) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3750 K, against the Sun's 5778 K.

Properties

absmag
-11.82
bv
1.53
constellation
Mus
luminosity
4655860.9352
mag
8.18
name
HD 101766
spect
K2Ib/II

About HD 101766

HD 101766 is an uncommon star. It sits in the constellation Mus, shines at apparent magnitude 8.18 and has spectral type K2Ib/II.

Its spectrum reads K2Ib/II — 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 101766 in the constellation Mus. At apparent magnitude 8.18, it is an easy target for binoculars.

Like any astronomical target, HD 101766 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 101766 is an uncommon star

HD 101766 scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Orange K-type star, Supergiant and Deep red 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.