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Uncommon exoplanet 27 EP

HD 11506 c

RA 28.2107° · Dec -19.5074° · 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

  • 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 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 October — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.255
diameter km
178586.8
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2008
dist ly
167.1908
eccentricity
0.228
eq temp k
374.44
host star teff
6123
insolation
3.6537
mag
7.51
mass earth
127.1314
name
HD 11506 c
orbital period days
223.92
radius earth
14
semi major au
0.771
spect
G0 V
sys num planets
3
sys num stars
1

Nearby objects

About HD 11506 c

HD 11506 c is an uncommon exoplanet. It lies about 167.2 light-years from Earth, shines at apparent magnitude 7.51, has spectral type G0 V and has an equilibrium temperature near 374 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 7.51, it is an easy target for binoculars.

Like any astronomical target, HD 11506 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 HD 11506 c is an uncommon exoplanet

HD 11506 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.