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Common star 20 EP

HR 2066

RA 89.1407° · Dec 28.9423° · 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

What it actually is

  • Spectral class. Its spectrum reads A2II — 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 6.3 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Auriga.
  • 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 December — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.3) — hotter and whiter than the Sun, the colour of Sirius or Vega.
  • 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.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 7620 K, against the Sun's 5778 K.

Properties

absmag
-13.65
bv
0.275
constellation
Aur
luminosity
25118864.3151
mag
6.35
name
HR 2066
spect
A2II

About HR 2066

HR 2066 is a common star. It sits in the constellation Aur, shines at apparent magnitude 6.35 and has spectral type A2II.

Its spectrum reads A2II — 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 HR 2066 in the constellation Aur. At apparent magnitude 6.35, it is an easy target for binoculars.

Like any astronomical target, HR 2066 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 2066 is a common star

HR 2066 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.