NGC 2438 is a planetary nebula in the southern constellation of Puppis.[2] Parallax measurements by Gaia put the central star at a distance of roughly 1,370 light years.[1] It was discovered by William Herschel on March 19, 1786.[3] NGC 2438 appears to lie within the cluster M46, but it is most likely unrelated since it does not share the cluster's radial velocity.[4][5] The case is yet another example of a superposed pair, joining the famed case of NGC 2818.[4][6]
This is a multi-shell planetary nebula with a bright inner nebula with a diameter of 60″, consisting of two somewhat detached shells.[7] It is expanding with a velocity of 37 km/s.[8] The structure is surrounded by a fainter, mostly circular halo that is more visible on the western half,[7] and has a diameter of 130″.[8] The mass of the main nebula is estimated at 0.45 M☉, while the shell has 0.5–0.8 M☉.[7] The main nebula has a temperature of about 10–13,000 K, rising to 15–17,000 K at the inner edge.[9]
The nebula consists of material ejected from the central star during the asymptotic giant branch stage, beginning some 8,500 years ago. The main nebula was formed at about half that age.[8] The central star of this planetary nebula is a 17.7-magnitude white dwarf,[3] with surface temperature of about 75,000 K (74,700 °C).[10] It is one of the hottest stars known.
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NGC2438 is a planetary nebula in the southern constellation of Puppis. Parallax measurements by Gaia put the central star at a distance of roughly 1,370 light...
may form a tidal tail due to a past interaction. The planetary nebula NGC2438 appears to lie within the cluster near its northern edge (the faint almost...
chance alignment. The case is an example of a superimposed pair, similar to NGC2438 and M46. Partly because of their small total mass, open clusters have relatively...
galaxies. List of NGC objects (1–1000) List of NGC objects (1001–2000) List of NGC objects (2001–3000) List of NGC objects (3001–4000) List of NGC objects (4001–5000)...
distance of approximately 5400 light-years from Earth. The planetary nebula NGC2438 is superimposed; it is approximately 2900 light-years from Earth. M46 is...
radial velocities rule out current membership of the planetary nebula NGC2438 in the open cluster M46", Monthly Notices of the Royal Astronomical Society...
of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects...
NGC 2420 is an open cluster in the constellation Gemini. It was discovered by William Herschel in 1783. The cluster is about two billion years old and...
confused with NGC 246, which is also nicknamed the "Skull Nebula." The complex has the following New General Catalogue (NGC) designations: NGC 2237 – Part...
NGC 2264 is the designation number of the New General Catalogue that identifies two astronomical objects as a single object: the Cone Nebula, and the...
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NGC 2008 is a distant spiral galaxy located in the constellation Pictor. Its speed relative to the cosmic microwave background is 10,367 ± 11 km/s, which...
NGC 2485 is a spiral galaxy located in the constellation of Canis Minor. It is located 233 million light-years away from Earth and has an estimated diameter...
Messier 93 or M93, also known as NGC 2447 or the Critter Cluster, is an open cluster in the modestly southern constellation Puppis, the imagined poop...
NGC 2491 is a spiral galaxy located in Canis Minor constellation. It is located 580 million light-years from Earth and has an approximate diameter of...
NGC 2403 (also known as Caldwell 7) is an intermediate spiral galaxy in the constellation Camelopardalis. It is an outlying member of the M81 Group, and...
NGC 2169 is an open cluster in the Orion constellation. It was possibly discovered by Giovanni Batista Hodierna before 1654 and discovered by William...
NGC 2244 (also known as Caldwell 50 or the Satellite Cluster) is an open cluster in the Rosette Nebula, which is located in the constellation Monoceros...
Messier 78 or M78, also known as NGC 2068, is a reflection nebula in the constellation Orion. It was discovered by Pierre Méchain in 1780 and included...
NGC 2146 (also known as the Dusty Hand Galaxy) is a barred spiral galaxy type SB(s)ab pec in the constellation Camelopardalis. The galaxy was discovered...
NGC 2442 and NGC 2443 are two parts of a single intermediate spiral galaxy, commonly known as the Meathook Galaxy or the Cobra and Mouse. It is about 50...
Group galaxies M31 and M32, and a few galaxies beyond the Local Group, e.g. NGC 4395. In these galaxies, the mean square (or root mean square) velocities...
II Program. The catalogue contains 400 objects. All objects are from the NGC. All objects are visible in mid northern latitudes, since they were all observed...
The Flame Nebula, designated as NGC 2024 and Sh2-277, is an emission nebula in the constellation Orion. It is about 1350 light-years away. At that distance...
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