The ongoing monitoring of the Galactic center and Sgr A*, the central
supermassive black hole, produces surprising and unexpected findings. This goes
hand in hand with the technical evolution of ground- and space-based telescopes
and instruments, but also with the progression of image filter techniques such
as the Lucy Richardson algorithm. As we continue to trace the members of the S
cluster close to Sgr A* on their expected trajectory around the supermassive
black hole, we present the finding of a new stellar source, which we call
S4716. The newly found star orbits SgrA* in about 4.0 yr and can be detected
with NIRC2 (Keck), OSIRIS (Keck), SINFONI (VLT), NACO (VLT), and GRAVITY
(VLTI). With a periapse distance of about 100 au, S4716 shows an equivalent
distance toward Sgr A* as S4711. These fast-moving stars undergo a similar
dynamical evolution, since S4711-S4716 share comparable orbital properties. We
will furthermore draw a connection between the recent finding of a new faint
star called S300 and the data presented here. Additionally, we observed a
blend-star event with S4716 and another newly identified S star S148 in 2017.
Preprint
Comment: 33 pages, 23 figures, published at ApJ
Subjects: Astrophysics - Astrophysics of Galaxies; Astrophysics - Solar and Stellar Astrophysics