Emission nebula | |
---|---|
Planetary nebula | |
Observation data: J2000 epoch | |
Right ascension | 15h 16m 49.95679s [1] |
Declination | −45° 38′ 58.6109″ [1] |
Distance | 7.7 kly (2.4 kpc) [2] ly |
Apparent dimensions (V) | 13–14 ″ [3] |
Constellation | Lupus |
Designations | ESO 274-7, IC 1168, [4] NGC 5882 [5] |
NGC 5882 is a small [4] planetary nebula [3] in the southern constellation of Lupus, positioned about 1.5° to the southwest of the star Epsilon Lupi. [6] It was discovered by English astronomer John Herschel on July 2, 1834 from the Cape of Good Hope observatory. [4] John L. E. Dreyer described it as "very small, round, quite sharp". [7] It is located at a distance of approximately 7.7 kilolight-years from the Sun. [2]
This nebular region consists of the cast-off outer atmosphere of an aging star. It is roughly elliptical in shape with several clumps of ionized material, and is surrounded by a larger region of low-level emission that extends for three times the nominal diameter of the main nebula. [3] The nebula is expanding with an average velocity of 12.5 km/s. It consists of two shells: the inner shell is elliptical and measures 11″ × 6″, while the more rapidly expanding outer shell is rounder with a diameter of 15″. The inner shell has what appears to be multiple bubble-like shapes. The clumps in the outer shell may be the result of instabilities. [8]
The elemental abundances of the nebula are very similar to those in the Sun, except for a times two enrichment of nitrogen. The latter suggests that the central star did not go through second dredge-up. The central star has an apparent visual magnitude of 13.43. It shines with 830 times the luminosity of the Sun and has 22.7% of the Sun's radius. [3] It is displaced slightly from the center of symmetry for the nebula. [8]
Emission nebula | |
---|---|
Planetary nebula | |
Observation data: J2000 epoch | |
Right ascension | 15h 16m 49.95679s [1] |
Declination | −45° 38′ 58.6109″ [1] |
Distance | 7.7 kly (2.4 kpc) [2] ly |
Apparent dimensions (V) | 13–14 ″ [3] |
Constellation | Lupus |
Designations | ESO 274-7, IC 1168, [4] NGC 5882 [5] |
NGC 5882 is a small [4] planetary nebula [3] in the southern constellation of Lupus, positioned about 1.5° to the southwest of the star Epsilon Lupi. [6] It was discovered by English astronomer John Herschel on July 2, 1834 from the Cape of Good Hope observatory. [4] John L. E. Dreyer described it as "very small, round, quite sharp". [7] It is located at a distance of approximately 7.7 kilolight-years from the Sun. [2]
This nebular region consists of the cast-off outer atmosphere of an aging star. It is roughly elliptical in shape with several clumps of ionized material, and is surrounded by a larger region of low-level emission that extends for three times the nominal diameter of the main nebula. [3] The nebula is expanding with an average velocity of 12.5 km/s. It consists of two shells: the inner shell is elliptical and measures 11″ × 6″, while the more rapidly expanding outer shell is rounder with a diameter of 15″. The inner shell has what appears to be multiple bubble-like shapes. The clumps in the outer shell may be the result of instabilities. [8]
The elemental abundances of the nebula are very similar to those in the Sun, except for a times two enrichment of nitrogen. The latter suggests that the central star did not go through second dredge-up. The central star has an apparent visual magnitude of 13.43. It shines with 830 times the luminosity of the Sun and has 22.7% of the Sun's radius. [3] It is displaced slightly from the center of symmetry for the nebula. [8]