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Uncommon exoplanet 29 EP

HD 170469 b

RA 277.2955° · Dec 11.6954° · exoplanet

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Score breakdown

· 4 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Two suns in its sky +12
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12

Trivia

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 8.2 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 June — 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. ≈ 3.4 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.411
diameter km
179862.42
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2007
dist ly
196.2742
eccentricity
0.11
eq temp k
209.6
host star teff
5842
insolation
0.3188
mag
8.21
mass earth
209.7678
multi star system
yes
name
HD 170469 b
orbital period days
1145
radius earth
14.1
semi major au
2.24
spect
G5 IV
sys num planets
1
sys num stars
2

About HD 170469 b

HD 170469 b is an uncommon exoplanet. It lies about 196.3 light-years from Earth, shines at apparent magnitude 8.21, has spectral type G5 IV and has an equilibrium temperature near 210 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 8.21, it is an easy target for binoculars.

Like any astronomical target, HD 170469 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 170469 b is an uncommon exoplanet

HD 170469 b scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Orbits a Sun-like star and Two suns in its sky — 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.