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Uncommon exoplanet 31 EP

HD 330075 b

RA 237.4055° · Dec -49.9639° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Puffy low-density world +12
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • Puffy low-density world · +12

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.

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 9.4 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 May — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.287
diameter km
182413.66
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2004
dist ly
147.7451
eccentricity
0
eq temp k
990
host star teff
5000
insolation
292.3345
mag
9.36
mass earth
152.5584
name
HD 330075 b
orbital period days
3.3877
radius earth
14.3
semi major au
0.04
spect
K1
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 330075 b

HD 330075 b is an uncommon exoplanet. It lies about 147.7 light-years from Earth, shines at apparent magnitude 9.36, has spectral type K1 and has an equilibrium temperature near 990 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 9.36, a small backyard telescope will bring it into view.

Like any astronomical target, HD 330075 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 330075 b is an uncommon exoplanet

HD 330075 b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

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