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The luminous Type IIn Supernova (SN) 2010jl shows strong evidence for theinteraction of the SN ejecta with dense circumstellar material (CSM). Wepresent observations of SN 2010jl for $t \sim 900$ d after its earliestdetection, including a sequence of optical spectra ranging from $t = 55$ to$909$ d. We also supplement our late time spectra and the photometricmeasurements in the literature with an additional epoch of new, late time$BVRI$ photometry. Combining available photometric and spectroscopic data, wederive a semi-bolometric optical light curve and calculate a total radiatedenergy in the optical for SN 2010jl of $\sim 3.5\times10^{50}$ erg. We alsoexamine the evolution of the H$\alpha$ emission line profile in detail and findevidence for asymmetry in the profile for $t \gtrsim 775$ d that is not easilyexplained by any of the proposed scenarios for this fascinating event. Finally,we discuss the interpretations from the literature of the optical andnear-infrared light curves, and propose that the most likely explanation oftheir evolution is the formation of new dust in the dense, pre-existing CSMwind after $\sim 300$ d.

Optical observations of the luminous Type IIn Supernova 2010jl for over 900 days