description Hubble's Variable Nebula Overview
The Hubble’s Variable Nebula, formally designated NGC 2261, is a reflection nebula located in the Monoceros constellation. It's notable for its fluctuating brightness observed by Edwin Hubble in 1916, a key piece of evidence supporting his theories about extragalactic distances. Astronomers and researchers studying stellar evolution, planetary formation, and the properties of interstellar dust clouds find this object particularly useful for detailed observation and analysis.
help Hubble's Variable Nebula FAQ
What is NGC 2261 and why is it called Hubble's Variable Nebula?
NGC 2261 is a reflection nebula in the constellation Monoceros that was studied by Edwin Hubble in 1916 at the Yerkes Observatory. It is called 'variable' because its shape and brightness visibly change over periods of weeks and months.
Why does Hubble's Variable Nebula change appearance?
The nebula's changing appearance is believed to be caused by shadows cast by dense dust clouds moving near its illuminating source, the variable star R Monocerotis. As these dust features shift, they alter the amount of light reflected by the nebula's gas and dust.
Can Hubble's Variable Nebula be seen with an amateur telescope?
Yes, NGC 2261 can be observed with a moderate amateur telescope under dark sky conditions, appearing as a small, comet-like fan shape. It is best viewed from the Northern Hemisphere during winter months when Monoceros is well positioned in the sky.
Was Hubble's Variable Nebula imaged by the Hubble Space Telescope?
Yes, the Hubble Space Telescope captured a well-known image of NGC 2261 early in the telescope's mission. This was fitting given that Edwin Hubble, for whom both the nebula and the telescope are named, first documented its variability in 1916.
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