Blue Planetary (NGC 3918)
The Blue Planetary (NGC 3918) is a planetary nebula in the
constellation Centaurus, 2.5 degrees northwest
of the star Delta Crux, that was discovered and named by John Herschel in 1834. In a 25-cm telescope, at low to medium power (75 to 120×),
it appears as a small pale blue disk similar to that of Neptune.
The image shown here was taken by the Hubble Space Telescope.
||2,600 light-years (800 pc)
||R.A. 11h 50m 18s,
Dec. -57° 10' 57"
||PN G294.6 + 04.7,
PK 294+04 1, ARO 514
AND STAR CLUSTERS