RBC EXT8 explained

RBC EXT8 is a globular cluster in the galaxy Messier 31, 27 kpc from the Galaxy Center. The spectral lines reveal levels of iron 800 times lower than the Sun. Its position is right ascension 00h53m14s.53, declination +41°33′24′′. (J2000 equinox) according to the Revised Bologna Catalogue (10).^[1] Its magnitude is 15.79, and 15.5" across.^[2]

Notes and References

1. https://arxiv.org/pdf/2010.07395.pdf An extremely metal-deficient globular cluster in the Andromeda Galaxy
2. http://de.arxiv.org/abs/1404.5807v1 The outer halo globular cluster system of M31 - I. The final PAndAS catalogue