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Uncommon exoplanet 31 EP

HD 30177 b

RA 70.4771° · Dec -58.0208° · exoplanet

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Score breakdown

· 5 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • Crowded system. One of at least 2 planets orbiting its star.

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 8.4 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 November — that's when to go looking.

Could we get there?

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

Properties

density gcc
7.2
diameter km
160728.12
discovery facility
Anglo-Australian Telescope
discovery method
Radial Velocity
discovery year
2002
dist ly
181.2994
eccentricity
0.186
eq temp k
148
host star teff
5680
inclination
65.5
insolation
0.0995
mag
8.41
mass earth
2622.0844
name
HD 30177 b
orbital period days
2539
radius earth
12.6
semi major au
3.49
spect
G8 V
sys num planets
2
sys num stars
1

About HD 30177 b

HD 30177 b is an uncommon exoplanet. It lies about 181.3 light-years from Earth, shines at apparent magnitude 8.41, has spectral type G8 V and has an equilibrium temperature near 148 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 8.41, it is an easy target for binoculars.

Like any astronomical target, HD 30177 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 30177 b is an uncommon exoplanet

HD 30177 b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Multi-planet system and Orbits a Sun-like star — 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.