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Common exoplanet 19 EP

HD 148427 b

RA 247.1171° · Dec -13.3996° · exoplanet

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Score breakdown

· 3 badges
19 pts · Common
Common 22 pts → Uncommon
  • Disputed — it may not be there at all +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 19

3 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Disputed — it may not be there at all · +10

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.

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 6.9 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 May — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 4.1 million years at Voyager 1's speed (17 km/s).

Properties

controversial
yes
density gcc
0.815
diameter km
174759.94
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
232.712
eccentricity
0.12
eq temp k
451.86
host star teff
5025
inclination
90.2
insolation
4.8905
mag
6.905
mass earth
381.3941
name
HD 148427 b
orbital period days
331.9
radius earth
13.7
semi major au
1.11
spect
K0 III- IV
sys num planets
1
sys num stars
1

About HD 148427 b

HD 148427 b is a common exoplanet. It lies about 232.7 light-years from Earth, shines at apparent magnitude 6.9, has spectral type K0 III- IV and has an equilibrium temperature near 452 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 6.9, it is an easy target for binoculars.

Like any astronomical target, HD 148427 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 148427 b is a common exoplanet

HD 148427 b scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Disputed — it may not be there at all — 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.