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Rare exoplanet 39 EP

BD+45 564 b

RA 32.9470° · Dec 45.9242° · exoplanet

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Score breakdown

· 3 badges
39 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

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 9.7 you'll want a small backyard telescope.
  • 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 October — that's when to go looking.

Properties

density gcc
0.944
diameter km
173484.32
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2021
dist ly
174.8914
eccentricity
0.12
eq temp k
238.82
habitable zone
yes
host star teff
5004
inclination
2.579
insolation
0.579
mag
9.67
mass earth
432.2466
name
BD+45 564 b
orbital period days
307.88
radius earth
13.6
semi major au
0.83
spect
K1
sys num planets
1
sys num stars
1

About BD+45 564 b

BD+45 564 b is a rare exoplanet. It lies about 174.9 light-years from Earth, shines at apparent magnitude 9.67, has spectral type K1 and has an equilibrium temperature near 239 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 9.67, a small backyard telescope will bring it into view.

Like any astronomical target, BD+45 564 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 BD+45 564 b is a rare exoplanet

BD+45 564 b scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, In the habitable zone and Gas giant — 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.