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The fastest star ever seen is moving at 8% the speed of light

Apr 7, 2020
They don’t mention this in the article but that star is going so fast that for every year on that star 1 year and 28 hours passes on Earth! That star has also gained noticeable mass traveling so fast.So that would have to be taken into account when calculating it’s mass as well.
Shades of “Miller’s Planet”!
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Oct 22, 2019
Very good here on the article, shorter but sweet :) There are 7 stars documented now moving rapidly around Sgr A*, the SMBH at the center of the Milky Way. These stars estimated masses range 2.0 to 6.1 solar masses for the fastest star in the group. That is an enormous amount of kinetic energy in the stars motion.

'The fastest star ever observed', https://phys.org/news/2020-08-fastest-star-1.html also 'S62 and S4711: Indications of a population of faint fast moving stars inside the S2 orbit -- S4711 on a 7.6 year orbit around Sgr~A*', https://arxiv.org/abs/2008.04764

My observation. The arXiv PDF is attached. Angular resolution 20 mas at 8000 pc distance = 160 AU, 120 mas = 960 AU. This fits well with Table 3 orbital parameters shown, e.g. pericenter distance (in AU), its apocentre distance (in AU). "ABSTRACT We present high-pass filtered NACO and SINFONI images of the newly discovered stars S4711-S4715 between 2004 and 2016. Our deep H+K-band (SINFONI) and K-band (NACO) data shows the S-cluster star S4711 on a highly eccentric trajectory around Sgr A* with an orbital period of 7.6 years and a periapse distance of 144 AU to the super massive black hole (SMBH). S4711 is hereby the star with the shortest orbital period and the smallest mean distance to the SMBH during its orbit to date...Table 3. Additional orbital and relativistic parameters for S62, S4711, S4712, S4713, S4714, S4715 stars in comparison with S2 star." My observation, Table 3. on page 7 shows the seven stars studied and orbital and velocity parameters. S62 is listed as the fastest, moving at 6.7% c or at least 20124 km/s. Table 2 (page 5) shows S62 estimated mass at 6.1 Msun. Other stars are 2.0 to 2.8 Msun.
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