Hubble's variable nebula

Hubble's variable nebula

(NGC 2261) A fan-shaped reflection nebula in the constellation Monoceros that is illuminated by the variable star R Monocerotis. R Mon, an infrared source, is a very young stellar object surrounded by a disk of dust and ejecting a bipolar outflow; this causes the brightness and outline of the nebula to vary. The nebula is a Herbig–Haro object. It takes its name from the great US astronomer Edwin Hubble, who first noticed its variability.

Hubble's Variable Nebula

[′həb·əlz ¦ver·ē·ə·bəl ′neb·yə·lə]
(astronomy)
A variable-brightness nebula associated with variable stars and fan-shaped in appearance.
References in periodicals archive ?
Hubble's Variable Nebula was the first object photographed by the 200-inch Hale Telescope at Mt Palomar in 1949.
Turning to variable nebulae, the Director opened with a pair of images of Hubble's variable nebula, taken by Nick James in 2010 March and Maurice Gavin in 2010 November, which showed clear changes to the structure of the nebula over those eight months.
All but one, Hubble's variable nebula, are generally poorly studied.
Hubble's Variable Nebula was originally discovered by William Herschel in 1783, but its variability was only noticed by Edwin Hubble in 1916.