Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  HD261055  ·  HD261231  ·  HD261264  ·  HD261389  ·  HD261659  ·  HD261660  ·  Hubble's Nebula  ·  Hubble's variable neb  ·  LBN 920  ·  NGC 2261
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NGC 2261, LBN920, Hubble's variable nebula in Monoceros, José Joaquín Pérez
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NGC 2261, LBN920, Hubble's variable nebula in Monoceros

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NGC 2261, LBN920, Hubble's variable nebula in Monoceros, José Joaquín Pérez
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NGC 2261, LBN920, Hubble's variable nebula in Monoceros

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Hubble's variable nebula is named after the American astronomer Edwin P. Hubble, who carried out some of the early studies of this object. It is a fan-shaped cloud of gas and dust which is illuminated by R Monocerotis (R Mon), the bright star at the bottom end of the nebula. Dense condensations of dust near the star cast shadows out into the nebula, and as they move the illumination changes, giving rise to the variations first noted by Hubble. The star itself, lying about 2,500 light-years from Earth, cannot be seen directly, but only through light scattered off of dust particles in the surrounding nebula.

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NGC 2261, LBN920, Hubble's variable nebula in Monoceros, José Joaquín Pérez