Many thanks again to AIAS Fellow Russ Davis in Florida! These are useful source papers for the same data as I used yesterday. So this is a valuable check by Russ Davis. When converted into S. I. units they give

M = 7.956 ten power 36 kilograms

a = 1.4245 ten power 14 metres

eps = 0.8831

T = 15.56 earth years

so I can now proceed to calculate delta phi = 6 pi MG/ (c squared a (1 – eps squared)) radians per second and convert to degrees per orbit using the orbital interval of 15.56 earth years.

To: EMyrone@aol.com

Sent: 17/04/2017 21:41:01 GMT Daylight Time

Subj: Re: PS to Parameters of Source 2 (Star S2)

Hi Dr. Evans,

I found the following references which identify some of the challenges to achieving an accurate data set for the S stars near the Milk Way center. Perhaps the inconsistent published data you are finding relates to these issues, at least in part.

For convenience, I included both of these papers as file attachments to this email.

Cheers,

Russ Davis

OrbitofS2_Gillessen_2009_ApJ_707_L114.pdf

StellarorbitsintheGalacticCenter_0810.4674v1.pdf

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