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Uncommon star 32 EP

HD 53177

RA 106.0002° · Dec -4.6235° · 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

What it actually is

  • Spectral class. Its spectrum reads K5Ib — 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 7.4 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Monoceros.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around January — 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 1.9) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3280 K, against the Sun's 5778 K.

What's in a name

  • Its catalogue. The HD number is from the Henry Draper Catalogue, in which Annie Jump Cannon personally classified the spectra of nearly 400,000 stars — still the largest such feat by one person.

Properties

absmag
-12.56
bv
1.898
constellation
Mon
luminosity
9204495.7175
mag
7.44
name
HD 53177
spect
K5Ib

Nearby objects

About HD 53177

HD 53177 is an uncommon star. It sits in the constellation Mon, shines at apparent magnitude 7.44 and has spectral type K5Ib.

Its spectrum reads K5Ib — 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 53177 in the constellation Mon. At apparent magnitude 7.44, it is an easy target for binoculars.

Like any astronomical target, HD 53177 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 53177 is an uncommon star

HD 53177 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.