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Uncommon exoplanet 27 EP

KMT-2017-BLG-2197L b

RA 262.6113° · Dec -30.1593° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Found by microlensing +12
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Found by microlensing · +12

Trivia

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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.

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

  • 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 June — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 447.1 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 39.7 million years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
7.9
diameter km
159452.5
discovery facility
KMTNet
discovery method
Microlensing
discovery year
2025
dist ly
25440.168
mass earth
2809.6031
name
KMT-2017-BLG-2197L b
radius earth
12.5
semi major au
15.91
sys num planets
1
sys num stars
1

Nearby objects

About KMT-2017-BLG-2197L b

KMT-2017-BLG-2197L b is an uncommon exoplanet. It lies about 25,440.2 light-years from Earth, spans roughly 12.5 Earth radii, weighs about 2,809.6 Earth masses and belongs to a system of 1 known planets.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

Like any astronomical target, KMT-2017-BLG-2197L 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 KMT-2017-BLG-2197L b is an uncommon exoplanet

KMT-2017-BLG-2197L b scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant and Found by microlensing — 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.