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Rare exoplanet 39 EP

HD 111998 b

RA 193.2954° · Dec -3.5531° · exoplanet

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Score breakdown

· 3 badges
39 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • 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. 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 6.1 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Could we get there?

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

Properties

density gcc
3.91
diameter km
164554.98
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2016
dist ly
108.3611
eccentricity
0.13
eq temp k
275.49
habitable zone
yes
host star teff
6557
inclination
90
insolation
0.8918
mag
6.1101
mass earth
1525.5764
name
HD 111998 b
orbital period days
810
radius earth
12.9
semi major au
1.91
spect
F6 V
sys num planets
1
sys num stars
1

Nearby objects

About HD 111998 b

HD 111998 b is a rare exoplanet. It lies about 108.4 light-years from Earth, shines at apparent magnitude 6.11, has spectral type F6 V and has an equilibrium temperature near 275 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 6.11, it is an easy target for binoculars.

Like any astronomical target, HD 111998 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 111998 b is a rare exoplanet

HD 111998 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 3 science badges — Confirmed exoplanet, In the habitable zone and Gas giant — 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.