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Uncommon exoplanet 27 EP

HD 185283 b

RA 295.3234° · Dec -56.3221° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Long-period world +10
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

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 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 July — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.903
diameter km
173484.32
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2023
dist ly
102.3967
eccentricity
0.07
eq temp k
93.97
host star teff
4848
inclination
91
insolation
0.013
mag
9.03
mass earth
413.1769
name
HD 185283 b
orbital period days
4060
radius earth
13.6
semi major au
4.6
spect
K3 V
sys num planets
1
sys num stars
1

About HD 185283 b

HD 185283 b is an uncommon exoplanet. It lies about 102.4 light-years from Earth, shines at apparent magnitude 9.03, has spectral type K3 V and has an equilibrium temperature near 94 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 9.03, a small backyard telescope will bring it into view.

Like any astronomical target, HD 185283 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 185283 b is an uncommon exoplanet

HD 185283 b 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, Frozen world and Long-period 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.