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Common exoplanet 19 EP

HD 285507 b

RA 61.7557° · Dec 15.3349° · exoplanet

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Score breakdown

· 3 badges
19 pts · Common
Common 22 pts → Uncommon
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 19

3 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10

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

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • 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. 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 10.5 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 November — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.651
diameter km
176035.56
discovery facility
Fred Lawrence Whipple Observatory
discovery method
Radial Velocity
discovery year
2013
dist ly
146.8658
eccentricity
0.09
eq temp k
736.35
host star teff
4503
insolation
53.0123
mag
10.49
mass earth
311.4734
name
HD 285507 b
orbital period days
6.0881
radius earth
13.8
semi major au
0.06
spect
K4.5 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 285507 b

HD 285507 b is a common exoplanet. It lies about 146.9 light-years from Earth, shines at apparent magnitude 10.49, has spectral type K4.5 V and has an equilibrium temperature near 736 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 10.49, a small backyard telescope will bring it into view.

Like any astronomical target, HD 285507 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 285507 b is a common exoplanet

HD 285507 b scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Tidally locked — 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.