RA 271.3852° · Dec -28.4903° · exoplanet
6 more points to reach Rare.
KMT-2017-BLG-0428L b is an uncommon exoplanet. It lies about 17,612.4 light-years from Earth, spans roughly 2.23 Earth radii, weighs about 5.59 Earth masses and belongs to a system of 1 known planets.
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.
Like any astronomical target, KMT-2017-BLG-0428L 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.
KMT-2017-BLG-0428L b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Sub-Neptune 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.