Kerbin, is that you? ;-)

[jlcarneiro]

Excerpt from the post source (below):

"Manser and his team calculated that the planetesimal — which orbits close to the white dwarf every two hours — must be unusually dense and no larger than 600 kilometres in diameter, in order to avoid being ripped apart by the star’s gravitational forces."

https://medium.com/predict/small-dense-planet-observed-orbiting-white-dwarf-star-dedd9d5e9088

The only difference is Kerbol is not a white dwarf... :-P

Edited June 16, 2019 by jlcarneiro

[Geonovast]

Kerbin's diameter is 1,200 km.

[ussoldier2002]

Is the sun white outside of the atmosphere like it is in real life? I never thought to pay attention to that before. I know that it still wouldn't be a white dwarf just sayin lol.

[Challyss]

Kerbin's orbit is 6 hours 

[RealKerbal3x]

1 minute ago, Challyss said:

Kerbin's orbit is 6 hours 

It rotates in six hours, but it orbits Kerbol in 426 days.

[Challyss]

Exactly, true, I'm stupid. Thank you ! 

Edited June 17, 2019 by Challyss

[magnemoe]

This its a bit real science rather than KSP but some hot rocky planets has idiotic high density like above 15 kg / liter. 
Points towards that degenerated matter in the core of gas giants are metastable and remind compressed after the gas and probably part of the solid core has been blown away. 
Other options is error or an planet entirely of very heavy metals who is little plausible