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Common exoplanet 17 EP

HD 29021 b

RA 69.4681° · Dec 60.6763° · 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
  • Gas giant +4
Total score 17

5 more points to reach Uncommon.

Badges

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

Trivia

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

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 7.8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • 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. ≈ 1.8 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 157.8 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
3.64
diameter km
164554.98
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
101.0885
eccentricity
0.453
eq temp k
163.2
host star teff
5560
inclination
33.7
insolation
0.1252
mag
7.76
mass earth
1420.693
name
HD 29021 b
orbital period days
1365
radius earth
12.9
semi major au
2.294
spect
G5
sys num planets
1
sys num stars
1

About HD 29021 b

HD 29021 b is a common exoplanet. It lies about 101.1 light-years from Earth, shines at apparent magnitude 7.76, has spectral type G5 and has an equilibrium temperature near 163 K.

Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

How to see it

At apparent magnitude 7.76, it is an easy target for binoculars.

Like any astronomical target, HD 29021 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 29021 b is a common exoplanet

HD 29021 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, Gas giant 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.