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CEN 16, also known as ALS 19608, is a O-type main sequence star in the constellation of Sagittarius. The star is located in the center of the Omega Nebula, roughly light years (or parsecs) away. The star has an apparent visual magnitude of 13.69. The star was discovered in March 1976 in a survey of stars in the Omega Nebula.
CEN 16 is a massive, young late O-type main sequence star in the Omega Nebula. The star has a spectral type of O8.5V found using data from the Very Large Telescope, meaning it is still in the main-sequence phase. The star is also believed to very massive with a spectroscopic-derived stellar mass of . The star has a rotational velocity of km/s. The star is predicted to be extremely young with an age of only four million years. The star has an estimated radius of 10.9 . The diameter was found using a stellar luminosity of , and an effective temperature of .<br />
In November 2024, it was discovered that a potential brown dwarf companion may orbit CEN 16. The unconfirmed brown dwarf companion has a radius of 7.5 and a mass of 70 . The candidate brown dwarf companion has a calculated temperature of 2,884 K, and a luminosity of 0.033 . CEN 16 B has a semi-major axis of 883.5 astronomical units. CEN 16 B is notable because substellar objects orbiting O-type main sequence stars are exceptionally rare. According to the Extrasolar Planets Encyclopaedia, CEN 16 B is the only substellar object found around a O-type main sequence star.