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This system consists of two yellow giants having types G0III and G8III (some sources give K0III), similar masses and brightness. The orbital period of the components is 104 days. The fact that one of the stars has a later spectral type is very convenient . It has stronger spectral lines of metals, including sodium. This allows you to immediately recognize which star is approaching and which is currently moving away. I made 3 observations so far with using a DIY 3D printed LowSpec spectrograph in the version v2 designed by @Paul Gerlach and a 1800 l/mm holographic grating. Based on these observations, the spectral spread for both observations for the sodium line is 0.79 Å (0.079 nm) or 4 pixels, which gives a difference of radial velocities of 40 km/s. Assuming that component A belongs to G8III and component B to G0III: 2019-12-03 component A was moving at relative vr to the barycenter of the system of -20 km/s and component B was moving at a relative vr of +20 km/s. 2020-01-23 component A was moving at a relative vr of +20 km/s and component B was moving at a relative vr of -20 km/s. I called radial speeds relative, because the radial velocity of the Capella barycenter to the Solar System wasn't included. I took the radial velocity of the Capella barycenter into account and I received this phase plot: The background is the plot of radial velocities from paper: M. Weber, K. G. Strassmeier, 2011, The spectroscopic orbit of Capella revisited https://arxiv.org/pdf/1104.0342.pdf
On the 2nd of July I closed my curtains one night before I went to bed but, before they were shut I noticed a strange multicoloured light flickering low in the sky in the northern celestial hemisphere. I Thought to myself if that is a star it looks amazing. The next night (3rd of July) I decided to take another look at this multicoloured light which was still there, Only this time I used my binoculars, I was seeing blues, greens & reds. We have all seen stars by looking up into the sky but, I have never seen a star create multi colours before. It makes you feel excited inside and you think that no one else can see this until you tell them and share the same experience together. I believe I was looking at the Capella Star which is the brightest star in the constellation Auriga and your not kidding it is bright. I cant wait to have another look tonight to see if the multi colours are still there. I would like to have taken at picture of it but I am not setup to do that just yet as I am very new to star gazing. I wish someone here can confirm what I saw and to post a picture of it would be awesome. Nikon Prostaff 3s 8 x 42