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    Blue Planetary (NGC 3918)

    Blue Planetary, NGC 3918
    A planetary nebula in the constellation Centaurus, 2.5° northwest of Delta Crux, that was discovered and named by John Herschel in 1834. In a 25-cm telescope, at low to medium power (75 to 120x), it appears as a small pale blue disk similar to that of Neptune. The image shown here was taken by the Hubble Space Telescope.


    Visual magnitude 8.1
    Angular size 12"
    Distance 2,600 light-years (800 pc)
    Position R.A. 11h 50m 18s,
    Dec. -57° 10' 57"
    Other designations PN G294.6 + 04.7, PK 294+04 1, ARO 514


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