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Rare star 40 EP

HR 6672

RA 268.7252° · Dec -24.8871° · star

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Score breakdown

· 4 badges
40 pts · Rare
Rare 50 pts → Epic
  • Blazing O-type star +26
  • Toward the galactic centre +8
  • Star +3
  • On the zodiac +3
Total score 40

10 more points to reach Epic.

Badges

  • Star · +3
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • Blazing O-type star · +26

Trivia

What it actually is

  • Spectral class. Its spectrum reads O7/O8 — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.

Find it in the sky

  • How to spot it. At magnitude 6.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Sagittarius.
  • 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 June — 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) — 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 10110 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
-13.82
bv
0.001
constellation
Sgr
luminosity
29376496.5196
mag
6.18
name
HR 6672
spect
O7/O8

About HR 6672

HR 6672 is a rare star. It sits in the constellation Sgr, shines at apparent magnitude 6.18 and has spectral type O7/O8.

Its spectrum reads O7/O8 — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.

How to see it

Look for HR 6672 in the constellation Sgr. At apparent magnitude 6.18, it is an easy target for binoculars.

Like any astronomical target, HR 6672 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 6672 is a rare star

HR 6672 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 4 science badges — Star, Toward the galactic centre, On the zodiac and Blazing O-type 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.