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This is an ongoing project with observations continuing.


2023 Spectra of SS433
HAG 24" RC 'David Harris' telescope, Lhires III spectroscope 300gr/mm, ZWO ASI2600MM Pro camera.
Analysis with RSpec software.
Graph of position of Hα lines over time in 2023
The red and blue Hα line positions change as the jets from the black hole precess.
This is caused by the opposing jets pointing towards the Earth and then away as they precess.
Thus the H line from the jets cycle from blue shifted to red shifted over the prescession period of 162.4 days.
The green plot shows the brightest line from hydrogen in the system but not in the jets.

The large gap in the data was due to telescope unavailability.

The red and blue curves are the best fit sine curves to the data,
they should cross at the wavelength of the Hα line in green.
However, light from the jets is affected by time dilation around the black hole
which causes the light to be 'stretched' to longer wavelengths (relativistic doppler effect)
and thus they cross at longer wavelength.