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Anomaly exoplanet 83 EP

47 UMa b

RA 164.8648° · Dec 40.4305° · exoplanet

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Score breakdown

· 7 badges
83 pts · Anomaly
Anomaly 120 pts → Mythic
  • In the habitable zone +30
  • Found before the year 2000 +18
  • Its star is visible to the naked eye +12
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 83

37 more points to reach Mythic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12
  • Orbits a Sun-like star · +8
  • Found before the year 2000 · +18

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.

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • 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.
  • Crowded system. One of at least 3 planets orbiting its star.

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 you can see it with your own eyes from a dark site.
  • 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 March — that's when to go looking.

Properties

density gcc
1.92
diameter km
168381.84
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
1996
dist ly
44.9988
eccentricity
0.032
eq temp k
215.23
habitable zone
yes
host star teff
5872
insolation
0.3576
mag
5.0335
mass earth
804.08
name
47 UMa b
orbital period days
1078
radius earth
13.2
semi major au
2.1
spect
G0V
sys num planets
3
sys num stars
1

About 47 UMa b

47 UMa b is an anomaly exoplanet. It lies about 45 light-years from Earth, shines at apparent magnitude 5.03, has spectral type G0V and has an equilibrium temperature near 215 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 5.03, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 47 UMa 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 47 UMa b is an anomaly exoplanet

47 UMa b scores 83 points on Spacedle's rarity scale, which places it in the anomaly tier. Another 37 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Multi-planet system, Its star is visible to the naked eye, Orbits a Sun-like star 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.