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Rare exoplanet 47 EP

HD 165155 b

RA 271.4893° · Dec -29.9173° · exoplanet

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Score breakdown

· 4 badges
47 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 47

3 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

What it actually is

  • 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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

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 June — that's when to go looking.

Could we get there?

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

Properties

density gcc
2.19
diameter km
168381.84
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2016
dist ly
206.644
eccentricity
0.2
eq temp k
239.9
habitable zone
yes
host star teff
5426
insolation
0.5482
mag
9.36
mass earth
918.5287
name
HD 165155 b
orbital period days
434.5
radius earth
13.2
semi major au
1.13
spect
G8 V
sys num planets
1
sys num stars
1

About HD 165155 b

HD 165155 b is a rare exoplanet. It lies about 206.6 light-years from Earth, shines at apparent magnitude 9.36, has spectral type G8 V and has an equilibrium temperature near 240 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 9.36, a small backyard telescope will bring it into view.

Like any astronomical target, HD 165155 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 165155 b is a rare exoplanet

HD 165155 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Gas giant 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.