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Common exoplanet 15 EP

HIP 57274 d

RA 176.1705° · Dec 30.9576° · 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

  • 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. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 March — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
0.321
diameter km
181138.04
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
84.3498
eccentricity
0.27
eq temp k
183.59
host star teff
4640
insolation
1.5183
mag
8.97
mass earth
167.4
name
HIP 57274 d
orbital period days
431.7
radius earth
14.2
semi major au
1.01
spect
K4 V
sys num planets
3
sys num stars
1

Nearby objects

About HIP 57274 d

HIP 57274 d is a common exoplanet. It lies about 84.3 light-years from Earth, shines at apparent magnitude 8.97, has spectral type K4 V and has an equilibrium temperature near 184 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 8.97, it is an easy target for binoculars.

Like any astronomical target, HIP 57274 d 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 57274 d is a common exoplanet

HIP 57274 d 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.