(432949) 2012 HH2 is a resonant trans-Neptunian object, approximately 255 kilometers (160 miles) in diameter, located in the outermost region of the Solar System.

As of 2021[update], no rotational lightcurve of 2012 HH2 has been obtained from photometric observations.

The body's rotation period, pole and shape remain unknown.

[2] Johnston's Archive estimates a mean diameter of 255 kilometers (160 miles), using a standard magnitude-to-diameter conversion with an assumed albedo of 0.09.

[3] Astronomer Mike Brown gives a nearly identical estimates of 253 kilometers (160 miles) for the object's diameter with an albedo of 0.08 and an absolute magnitude of 6.3.