S Ori 52
S Ori 52 is an astronomical object of an uncertain nature in the Delta Orionis cluster and is in spectral class L. It was first observed using the W. M. Keck Observatory in Mauna Kea. Its mass is estimated to be between 2 and 8 Jupiter masses. The exact nature of the object remains controversial and studies show it could be a sub-brown dwarf, an isolated planet, or that it could simply be an older brown dwarf lying in the foreground of the Orionis cluster.
- "Discovery of Young, Isolated Planetary Mass Objects in the σ Orionis Star Cluster" by M. R. Zapatero Osorio, V. J. S. Béjar1, E. L. Martı́n, R. Rebolo1, D. Barrado y Navascués, C. A. L. Bailer-Jones and R. Mundt in Science 6 October 2000 Vol. 290 no. 5489 pp. 103-107 doi:10.1126/science.290.5489.103
- Stellar Spectral Classification, by Richard O. Gray and Christopher J. Corbally (page 433)
- "S Orionis 70: Just a Foreground Field Brown Dwarf?". Adsabs.harvard.edu. Retrieved 2013-11-16.
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