HAT-P-38, formally named Horna, is a star located in the northern constellation Triangulum.
It has an apparent magnitude of 12.51,[2] making it readily visible in amateur telescopes but not to the naked eye.
The object is located relatively far at a distance of 821 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a spectroscopic radial velocity of −19.85 km/s.
[5] It radiates 67.72% the luminosity of the Sun[1] from its photosphere at an effective temperature of 5,330 K,[4] giving it a yelllowish-orange hue.
[8] HAT-P-38b had a higher water vapor abundance compared to the latter, indicating that the planet is free of clouds or hazes in its upper atmosphere.