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Rare exoplanet 34 EP

HD 3167 d

RA 8.7401° · Dec 4.3807° · exoplanet

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Score breakdown

· 5 badges
34 pts · Rare
Rare 50 pts → Epic
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 34

16 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

Trivia

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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • Crowded system. One of at least 4 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 9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Could we get there?

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

Properties

density gcc
2.26
diameter km
33293.682
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2017
dist ly
154.2388
eccentricity
0.35
eq temp k
865
host star teff
5338
inclination
39
insolation
88.9
mag
8.97
mass earth
7.3
name
HD 3167 d
orbital period days
8.3967
radius earth
2.61
semi major au
0.077
spect
K0 V
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 3167 d

HD 3167 d is a rare exoplanet. It lies about 154.2 light-years from Earth, shines at apparent magnitude 8.97, has spectral type K0 V and has an equilibrium temperature near 865 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 8.97, it is an easy target for binoculars.

Like any astronomical target, HD 3167 d 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 3167 d is a rare exoplanet

HD 3167 d scores 34 points on Spacedle's rarity scale, which places it in the rare tier. Another 16 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Sub-Neptune, Tidally locked, Multi-planet system 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.