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NGC 2899
NGC 2899 is a planetary nebula in the southern constellation of Vela. It was discovered by English astronomer John Herschel on February 27, 1835. This nebula can be viewed with a moderate-sized amateur telescope, but requires a larger telescope to resolve details. NGC 2899 is located at a distance of 1026 ± from the Sun and 7939 ± from the Galactic Center. This nebula has an overall kidney shape that is elongated along an axis from WNW to ESE. The overall topology is bipolar with a significant equatorial structure. This shape is believed to result from a binary star system. The mean expansion rate is 43 km/s, with high velocity structures expanding at 110 km/s. The core mass of the central star is estimated as ~1.2 Solar mass. The nebula lies within a large cavity in the surrounding medium. This opening has quadrupolar shape with a physical dimension of 14 pc. The elongation lies along a position angle of 37 °, which is aligned with the minor axis of the planetary nebula. This opening was most likely crafted by a fast stellar wind coming from the central star during its asymptotic giant branch stage, prior to the formation of a planetary nebula. The shape and filamentary structures suggest the interaction of a binary star system.
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