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Rare star 43 EP

HIP 87942

RA 269.4829° · Dec -22.9758° · star

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Score breakdown

· 6 badges
43 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Toward the galactic centre +8
  • Deep red star +8
  • Star +3
  • On the zodiac +3
  • Yellow-white F-type star +3
Total score 43

7 more points to reach Epic.

Badges

  • Star · +3
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Deep red star · +8

Trivia

Hard to believe

  • True brightness. It pours out about 1.8 million 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 F2Ib-II+... — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 9.2 you'll want a small backyard telescope, 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 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 3690 K, against the Sun's 5778 K.

Properties

absmag
-10.79
bv
1.573
constellation
Sgr
luminosity
1803017.7409
mag
9.21
name
HIP 87942
spect
F2Ib-II+...

About HIP 87942

HIP 87942 is a rare star. It sits in the constellation Sgr, shines at apparent magnitude 9.21 and has spectral type F2Ib-II+....

Its spectrum reads F2Ib-II+... — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HIP 87942 in the constellation Sgr. At apparent magnitude 9.21, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 87942 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 87942 is a rare star

HIP 87942 scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.

That score comes from 6 science badges — Star, Toward the galactic centre, On the zodiac, Yellow-white F-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.