LkCa 15, Diameter if 1 light day away · Large and Small Magellanic Clouds - Real Size?
The star lies 457 light-years from Earth in the constellation Taurus. LkCa 15 is only about 2 million years old. The sun, by contrast, is about 4.6 billion years old. LkCa 15 has about the same mass as the sun.
Christian Science Monitor, 2011:
How are planets born? LkCa 15 could give scientists first-ever peek.
By Pete Spotts, Staff writer OCTOBER 19, 2011
If this star is 1 light day away, how big is it?
I take "same mass as sun" as implying "same volume as sun", though that is less certain in terms of star development, as envsaged by these heliocentrics and deep timers.
457 light years * 365.25 light days / light year = 166,919.25 light days
166,919.25 light days : 1 light day
How large is the sun?
Equatorial radius 695,700 km = equatorial diameter of 1,391,400 km
1,391,400 km : 166,919.25 = 8.3357671448919163 km
or 8 336 meters
or 5.180 miles/HGL