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Common star 20 EP

HIP 47691

RA 145.8568° · Dec -57.2821° · star

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Score breakdown

· 3 badges
20 pts · Common
Common 22 pts → Uncommon
  • Bright giant +12
  • White A-type star +5
  • Star +3
Total score 20

2 more points to reach Uncommon.

Badges

  • Star · +3
  • White A-type star · +5
  • Bright giant · +12

Trivia

Hard to believe

  • True brightness. It pours out about 307.6 thousand 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 A1II — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.

Find it in the sky

  • How to spot it. At magnitude 11.1 you'll want a small backyard telescope, over in Carina.
  • 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 yellow-white (B−V 0.6) — a shade brighter and crisper than our own Sun.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

Properties

absmag
-8.89
bv
0.56
constellation
Car
luminosity
313328.5724
mag
11.11
name
HIP 47691
spect
A1II

About HIP 47691

HIP 47691 is a common star. It sits in the constellation Car, shines at apparent magnitude 11.11 and has spectral type A1II.

Its spectrum reads A1II — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HIP 47691 in the constellation Car. At apparent magnitude 11.11, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 47691 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 HIP 47691 is a common star

HIP 47691 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, White A-type star and Bright giant — 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.