:INFO
Mini-neptune around Kepler-48
It is 2.71 times Earth's radius, closest in size to Neptune, and 14.6 times Earth's mass, at 4.01 g/cm3, less dense than Earth. A year there lasts 9.67 days. The host star Kepler-48 runs at 5194 K with 0.88 times the Sun's mass.

:STATS
[icon:TARGET] Radius | 2.71 Earth radii
[icon:CHART] Mass | 14.6 Earth masses
[icon:CLOCK] One year | 9.67 days
[icon:STAR] Host star | Kepler-48 at 5194 K
[icon:USERS] Distance | 1000 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.078% at each transit

:TIMELINE
🔭🪐📅
2012-01-01 | Kepler-48 b, Kepler-48 c
2014-01-01 | Kepler-48 d

:CHECKLIST
What the archive holds on this planet
[ ] A radius from transit photometry. Yes.
[ ] A weight, not just a width. Yes.
[ ] A density, which decides rock or gas. Yes.
[ ] A semi-major axis. No.
[ ] A measured temperature rather than a derived one. No.
[ ] An eccentricity, so we know if the orbit is a circle. No.

:PATH
What the transit gives
The depth of the dip is the ratio of the two discs, so the radius follows.

:NOTE
Found by Kepler in 2012. Kepler watched a single field continuously, so it found the planets that come round often. A world with a long year simply never repeated within the mission.

:NOTE
Size from the shadow, mass from elsewhere. Most transiting planets never get the second half, and without it composition stays a guess.

:NOTE
Kepler-48 has 5 known planets. Planets in company tug on each other, and those tugs are measurable, which is how masses get pinned down without a wobble.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-48%20c
NASA Exoplanet Archive: source data, including the values not used here