Abstract
ABSTRACT The discovery of a very sparse star cluster in the constellation Hydra in the southern sky is reported. The cluster was found during a search for peculiar galaxies in a plate from the ESO/SRC IIIa-J Southern Sky Survey, observed at a magnification of 20X. Designated AM-4, the cluster contains approximately 50 stars within a 110 arcsec diameter. Assumptions that the brightest stars in the cluster are red giants and that absorption in the direction of the cluster is low lead to the estimate that the cluster is over 200 kpc distant, and so might be intrinsically rich. The chance discovery of the cluster points up the need for more detailed surveys to determine the actual density of extreme halo or intergalactic globular clusters.
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