3.52 NGC 6809/M 55
The PSPC observation has been published by Johnston et al. (1996); four
sources detected with the PSPC are also found with the longer HRI
observation. One of these, X9, is within the (large) cluster core, and may
belong to the cluster. The HRI positions are more accurate than the
previously published positions based on the PSPC, but in the absence of an
optical identification the bore sight cannot be determined accurately.
M.55. A nne globular cluster 10' in diameter. The background of faint stars
is less dense near the center than in most clusters of this type. 4 s.n.