History
Prior to the discovery of the nebula, the central star of the Stingray Nebula was known as He3-1357, which Karl Gordon Henize classified as an A or B type Hα emission line star in 1967. It was observed in 1971 to be a pre-planetary nebula (PPNe) when it seemed to be an asymptotic giant branch (AGB) B1 supergiant. Planetary nebula (PN) emission lines were identified in this star in 1989 by the IUE (Parthasarathy et al. 1993). As the nebula would be newly formed and very small, ground-based observations were not able to resolve it; so Bobrowsky observed it with the Hubble Space Telescope, discovering the nebula, which he named the "Stingray Nebula."
Read more about this topic: Stingray Nebula
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