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Common exoplanet 17 EP

HD 177565 b

RA 286.7176° · Dec -37.8122° · exoplanet

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Score breakdown

· 3 badges
17 pts · Common
Common 22 pts → Uncommon
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 17

5 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • 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. 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. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 6.2 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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.

Getting there

  • Aboard Voyager 1. ≈ 969.6 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.3
diameter km
51024.8
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
55.1787
eccentricity
0.0593
eq temp k
539.21
host star teff
5627
insolation
14.5941
mag
6.15
mass earth
15.1
name
HD 177565 b
orbital period days
44.505
radius earth
4
semi major au
0.246
spect
G8V
sys num planets
1
sys num stars
1

About HD 177565 b

HD 177565 b is a common exoplanet. It lies about 55.2 light-years from Earth, shines at apparent magnitude 6.15, has spectral type G8V and has an equilibrium temperature near 539 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 6.15, it is an easy target for binoculars.

Like any astronomical target, HD 177565 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 177565 b is a common exoplanet

HD 177565 b scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Neptune-like 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.