NGC 6210
Template:Short description Template:Infobox nebula
NGC 6210, sometimes also known as the Turtle Nebula,[1] is a planetary nebula located in the constellation Hercules, approximately Script error: No such module "convert". from the Sun.[2] It is positioned about 38° above the galactic plane at a vertical distance of about Script error: No such module "convert". and thus has little extinction from intervening interstellar dust.[3] This object was first recorded as a star-like feature by Joseph Lalande on March 22, 1799. However, credit for the discovery of a nebula goes to Wilhelm Struve in 1825. John L. E. Dreyer described it as, "a planetary nebula, very bright, very small, round, disc and border".[4]
This nebula is "very amorphous and irregular" in shape, but forms a rough ellipsoid.[3] It consists of two parts; a bright inner region filled with arches and filaments spanning 13″ × 16", and a larger and fainter outer volume that has a pair of "tubular" structures. The inner region has an expansion velocity ranging over 19–24 km/s.[2] The emission from the outer part of the nebula is only about 1% of the total.[3]
The central star has an apparent visual magnitude of 12.66 and the spectrum matches a hydrogen-rich star of type O(H). It has an estimated temperature of Script error: No such module "val".. The abundances of the nebula suggest a low initial mass for the central star, probably Script error: No such module "val"..[3] Outflow from this star has been measured with velocities of Script error: No such module "val"., and the estimated mass loss rate is Script error: No such module "val". yr−1. There appears to be a collaminated jet feature to the northwest, suggesting the central star is ejecting material along two and possibly four such directions.[5]
Gallery
-
The center of NGC 6210
References
<templatestyles src="Reflist/styles.css" />
Cite error: <ref> tag with name "SIMBAD" defined in <references> is not used in prior text.
<ref> tag with name "GaiaDR2" defined in <references> is not used in prior text.Script error: No such module "Check for unknown parameters".