Abstract
We studied the kinematics of the galactic supernova remnant (SNR) G206.9+2.3 (PKS 0646+06) in the [SII] &λ; 6717 and 6731 Å lines, as one of the initial steps of a long-term project to determine kinematical distances to galactic SNRs with optical counterparts. We obtained the kinematic distance to this nebula by first showing that the filaments detected were in fact the optical counterpart of the radio SNR. The distance estimated here is slightly greater than that of the Monoceros Loop. We estimate that G206.9+2.3 is located about 2.2 kpc from the Sun, in a zone where several background and foreground nebulae at different velocities are seen in projection. We measured a shock velocity of 86 km s^{-1} and a linear diameter of 18 pc. Finally, we calculated the energy deposited in the interstellar medium by the SN explosion as 1.7×10^{49} ergs and concluded that the SNR is in the radiative phase of evolution with an age of 6.4×10^{4} years.
