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Uncommon exoplanet 29 EP

HD 30669 b

RA 72.1199° · Dec -28.4191° · exoplanet

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Score breakdown

· 4 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Puffy low-density world +12
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Puffy low-density world · +12
  • Orbits a Sun-like star · +8

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 9.1 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 December — 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. ≈ 3.3 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.281
diameter km
182413.66
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2014
dist ly
189.4458
eccentricity
0.18
eq temp k
151.45
host star teff
5400
insolation
0.0987
mag
9.12
mass earth
149.37
name
HD 30669 b
orbital period days
1684
radius earth
14.3
semi major au
2.69
spect
G9 V
sys num planets
1
sys num stars
1

About HD 30669 b

HD 30669 b is an uncommon exoplanet. It lies about 189.4 light-years from Earth, shines at apparent magnitude 9.12, has spectral type G9 V and has an equilibrium temperature near 151 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 9.12, a small backyard telescope will bring it into view.

Like any astronomical target, HD 30669 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 30669 b is an uncommon exoplanet

HD 30669 b scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Puffy low-density world and Orbits a Sun-like star — 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.