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Common exoplanet 15 EP

HD 27894 b

RA 65.1976° · Dec -59.4097° · exoplanet

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Score breakdown

· 3 badges
15 pts · Common
Common 22 pts → Uncommon
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 15

7 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6

Trivia

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • Crowded system. One of at least 3 planets orbiting its star.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 9.4 you'll want a small backyard telescope.
  • 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 November — that's when to go looking.

Properties

density gcc
0.386
diameter km
179862.42
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2005
dist ly
142.9261
eccentricity
0.047
eq temp k
627.88
host star teff
4875
inclination
89
insolation
22.7604
mag
9.36
mass earth
196.7358
name
HD 27894 b
orbital period days
18.0194
radius earth
14.1
semi major au
0.125
spect
K2 V
sys num planets
3
sys num stars
1

About HD 27894 b

HD 27894 b is a common exoplanet. It lies about 142.9 light-years from Earth, shines at apparent magnitude 9.36, has spectral type K2 V and has an equilibrium temperature near 628 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 9.36, a small backyard telescope will bring it into view.

Like any astronomical target, HD 27894 b 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 HD 27894 b is a common exoplanet

HD 27894 b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.