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Uncommon exoplanet 31 EP

HD 34445 d

RA 79.4207° · Dec 7.3527° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Richly packed system +14
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Richly packed system · +14
  • Orbits a Sun-like star · +8

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.
  • Crowded system. One of at least 6 planets orbiting its star.

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 7.3 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 December — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.754
diameter km
77430.134
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2017
dist ly
150.3276
eccentricity
0.027
eq temp k
476.32
host star teff
5836
insolation
8.6625
mag
7.31
mass earth
30.7
name
HD 34445 d
orbital period days
117.87
radius earth
6.07
semi major au
0.4817
spect
G0 V
sys num planets
6
sys num stars
1

About HD 34445 d

HD 34445 d is an uncommon exoplanet. It lies about 150.3 light-years from Earth, shines at apparent magnitude 7.31, has spectral type G0 V and has an equilibrium temperature near 476 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 7.31, it is an easy target for binoculars.

Like any astronomical target, HD 34445 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 34445 d is an uncommon exoplanet

HD 34445 d scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Richly packed system 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.