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Rare exoplanet 39 EP

HR 810 b

RA 40.6417° · Dec -50.7993° · exoplanet

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Score breakdown

· 4 badges
39 pts · Rare
Rare 50 pts → Epic
  • Found before the year 2000 +18
  • Its star is visible to the naked eye +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12
  • Found before the year 2000 · +18

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. 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 5.4 you can see it with your own eyes from a dark site.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around October — 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. ≈ 992.6 thousand years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 88.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
5.29
diameter km
162003.74
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
1999
dist ly
56.484
eccentricity
0.14
eq temp k
329.57
host star teff
6167
inclination
87
insolation
2.116
mag
5.4
mass earth
1970.5361
name
HR 810 b
orbital period days
302.8
radius earth
12.7
semi major au
0.92
spect
G0V
sys num planets
1
sys num stars
1

About HR 810 b

HR 810 b is a rare exoplanet. It lies about 56.5 light-years from Earth, shines at apparent magnitude 5.4, has spectral type G0V and has an equilibrium temperature near 330 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 5.4, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 810 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 HR 810 b is a rare exoplanet

HR 810 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 4 science badges — Confirmed exoplanet, Gas giant, Its star is visible to the naked eye and Found before the year 2000 — 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.