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Anomaly exoplanet 81 EP

HD 147513 b

RA 246.0058° · Dec -39.1930° · exoplanet

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Score breakdown

· 7 badges
81 pts · Anomaly
Anomaly 120 pts → Mythic
  • In the habitable zone +30
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Disputed — it may not be there at all +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 81

39 more points to reach Mythic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Its star is visible to the naked eye · +12
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12
  • Disputed — it may not be there at all · +10

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. 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 May — that's when to go looking.

Properties

controversial
yes
density gcc
0.823
diameter km
174759.94
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2003
dist ly
42.0846
eccentricity
0.26
eq temp k
244.43
habitable zone
yes
host star teff
5883
insolation
0.5609
mag
5.37
mass earth
385
multi star system
yes
name
HD 147513 b
orbital period days
528.4
radius earth
13.7
semi major au
1.32
spect
G3/5V
sys num planets
1
sys num stars
2

About HD 147513 b

HD 147513 b is an anomaly exoplanet. It lies about 42.1 light-years from Earth, shines at apparent magnitude 5.37, has spectral type G3/5V and has an equilibrium temperature near 244 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 5.37, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 147513 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 147513 b is an anomaly exoplanet

HD 147513 b scores 81 points on Spacedle's rarity scale, which places it in the anomaly tier. Another 39 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Its star is visible to the naked eye, Orbits a Sun-like star, Two suns in its sky and Disputed — it may not be there at all — 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.