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Rare star 40 EP

HR 3692

RA 139.0960° · Dec -44.2657° · star

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Score breakdown

· 5 badges
40 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Naked-eye visible +8
  • Deep red star +8
  • Star +3
  • Orange K-type star +3
Total score 40

10 more points to reach Epic.

Badges

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

Trivia

What it actually is

  • Spectral class. Its spectrum reads K3Ib — 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 5.1 you can see it with your own eyes from a dark site, over in Vela.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around February — 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 1.6) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3600 K, against the Sun's 5778 K.

What's in a name

  • Its catalogue. The HR number is from the Bright Star Catalogue — roughly 9,100 stars, essentially everything the unaided eye can see.

Properties

absmag
-14.88
bv
1.636
constellation
Vel
luminosity
77983011.0523
mag
5.12
name
HR 3692
spect
K3Ib

About HR 3692

HR 3692 is a rare star. It sits in the constellation Vel, shines at apparent magnitude 5.12 and has spectral type K3Ib.

Its spectrum reads K3Ib — 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 HR 3692 in the constellation Vel. At apparent magnitude 5.12, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 3692 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 3692 is a rare star

HR 3692 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, Naked-eye visible, 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.