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Rare exoplanet 35 EP

HD 69830 d

RA 124.6010° · Dec -12.6364° · exoplanet

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Score breakdown

· 5 badges
35 pts · Rare
Rare 50 pts → Epic
  • Its star is visible to the naked eye +12
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 35

15 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12
  • Orbits a Sun-like star · +8

Trivia

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.
  • Crowded system. One of at least 3 planets orbiting its star.

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 you can see it with your own eyes from a dark site.
  • 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 January — 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. ≈ 719.8 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.13
diameter km
56765.09
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2006
dist ly
40.9623
eccentricity
0.07
eq temp k
308.1
host star teff
5385
insolation
1.5182
mag
5.96
mass earth
18.1
name
HD 69830 d
orbital period days
197
radius earth
4.45
semi major au
0.63
spect
K0V
sys num planets
3
sys num stars
1

About HD 69830 d

HD 69830 d is a rare exoplanet. It lies about 41 light-years from Earth, shines at apparent magnitude 5.96, has spectral type K0V and has an equilibrium temperature near 308 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 5.96, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 69830 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 69830 d is a rare exoplanet

HD 69830 d scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Neptune-like, Multi-planet system, Its star is visible to the naked eye 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.