iotw2430 — Image of the Week
A ‘Butterfly’ from Death’s Door
24 July 2024: This ghostly, butterfly-shaped planetary nebula, captured with Gemini North, one half of the International Gemini Observatory, supported in part by the U.S. National Science Foundation and operated by NSF NOIRLab, is known as Kohoutek 3-46. Kohoutek 3-46 derives its name from the prolific planetary nebula hunter who discovered it, Czech astronomer Luboš Kohoutek. Located in the constellation Cygnus, Kohoutek 3-46 is estimated to be around 20,000 years old and around 7200 light-years away. The term ‘planetary nebula’ is a misnomer, since these nebulae are unrelated to planets. The term originates from their planet-like round shape, more obviously seen in this earlier NOIRLab Image of the Week. Kohoutek 3-46 has expanded into an unusual bipolar shape, classified by its well-defined hourglass shape, prominent equatorial ring and marked waist. About 10–20% of planetary nebulae are bipolar. No matter the shape they take on, these glowing clouds of gas form after a star …