809 Lundia is a small, binary, V-type asteroid[3] orbiting within the Flora family in the main belt.

A mechanism of interplay between the Yarkovsky effect and nonlinear secular resonances (primarily involving Jupiter and Saturn) has been proposed.

[4] Lightcurve observations in 2005 revealed that Lundia is a binary system of two similarly sized objects orbiting their common centre of gravity.

[5] Due to the similar size of the primary and secondary the Minor Planet Center lists this as a binary companion.

They orbit each other in a period of 15.4 hours,[5] which roughly indicates that the separation between them is very close: to the order of 10–20 km if typical asteroid albedo and density values are assumed.