Quote:
Originally Posted by astroron
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Hi Ron,
Andrea Ghez of the UCLA Keck Galactic Centre Group is probably the Worlds leading authority on this. She has been studying the high velocity stars in orbit around the super massive black hole candidate Sag A*(pronounced Sag A star) for over 15 yrs. The star in closest orbit S02, which attains a velocity of 6000 km/sec at closest approach, it has a very elliptical orbit.
In August this year Andrea Ghez reported on her data for a complete orbit of S02. This enabled her to refine not only the mass of Sag A* but also the distance to the Galactic Centre (R0).
I posted her paper on this forum in a post titled "Implications of refining R0"
When I work out how to post a link to it I will include it in another reply.
Regards
Trevor