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Uncommon exoplanet 33 EP

HD 75784 c

RA 133.0992° · Dec 13.2331° · exoplanet

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Long-period world +10
  • Frozen world +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Multi-planet system · +6

Trivia

What makes it special

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

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • Crowded system. One of at least 2 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 7.8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around February — that's when to go looking.

Could we get there?

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

Properties

density gcc
4.7
diameter km
163279.36
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2018
dist ly
278.6419
eccentricity
0.489
eq temp k
149.31
host star teff
4867
insolation
0.0808
mag
7.84
mass earth
1792.5612
name
HD 75784 c
orbital period days
7900
radius earth
12.8
semi major au
8.4
spect
G5
sys num planets
2
sys num stars
1

About HD 75784 c

HD 75784 c is an uncommon exoplanet. It lies about 278.6 light-years from Earth, shines at apparent magnitude 7.84, has spectral type G5 and has an equilibrium temperature near 149 K.

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

How to see it

At apparent magnitude 7.84, it is an easy target for binoculars.

Like any astronomical target, HD 75784 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 75784 c is an uncommon exoplanet

HD 75784 c scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period 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.