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Uncommon exoplanet 27 EP

HIP 57274 c

RA 176.1705° · Dec 30.9576° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Puffy low-density world +12
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Puffy low-density world · +12
  • 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. 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.

Properties

density gcc
0.249
diameter km
181138.04
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
84.3498
eccentricity
0.05
eq temp k
437.32
host star teff
4640
insolation
48.8832
mag
8.97
mass earth
130
name
HIP 57274 c
orbital period days
32.03
radius earth
14.2
semi major au
0.178
spect
K4 V
sys num planets
3
sys num stars
1

Nearby objects

About HIP 57274 c

HIP 57274 c is an uncommon 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 437 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 8.97, it is an easy target for binoculars.

Like any astronomical target, HIP 57274 c 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 c is an uncommon exoplanet

HIP 57274 c scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Puffy low-density world 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.