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Uncommon exoplanet 33 EP

HD 19994 b

RA 48.1943° · Dec -1.1964° · exoplanet

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Score breakdown

· 4 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12
  • 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. 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 5.1 you can see it with your own eyes from a dark site.
  • 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 November — 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. ≈ 1.3 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.951
diameter km
173484.32
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2003
dist ly
73.464
eccentricity
0.063
eq temp k
350.1
host star teff
6188
insolation
2.2324
mag
5.0634
mass earth
435.41
multi star system
yes
name
HD 19994 b
orbital period days
466.2
radius earth
13.6
semi major au
1.305
spect
F8 V
sys num planets
1
sys num stars
3

About HD 19994 b

HD 19994 b is an uncommon exoplanet. It lies about 73.5 light-years from Earth, shines at apparent magnitude 5.06, has spectral type F8 V and has an equilibrium temperature near 350 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 5.06, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 19994 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 19994 b is an uncommon exoplanet

HD 19994 b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Its star is visible to the naked eye 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.