Hi all, 
It's often said that great discoveries are made by building on work done by others and Edwin Hubble's discovery in 1923 that M31 was not a Nebula, but in fact a galaxy of it's own is no exception.

His remarkable and perspective shifting discovery was made possible by Henrietta Swan Leavitt's work, providing astronomers with the first standard candle. Her discovery allowed one to know the true luminosity of a Cepheid by simply observing its pulsation period. This in turn allowed Hubble to determine the distance to the star, by comparing its known luminosity to its observed brightness and thus changing our understanding of the Universe.  The star in question is known as V1. 

Today is actually the anniversary of the death of Henrietta Swan Leavitt.

 Image consists of 411 frames of 60 and 120 second exposures

Asi 2600mc through a Takahashi Epsilon 160ed mounted on an AzEq6

Stacked in APP, Processed in APP, PI and PS

Regards,
Richard.

Excellent Image

That's a beautiful image, and the back story was great - Thanks Richard!

Clear skies, 
Darren. 

Great image Richard,

Will your next project be to plot the light curve

Michael.

Bruno wrote:

Excellent Image

Thanks very much.
 

Until_then-Goodnight! wrote:

That's a beautiful image, and the back story was great - Thanks Richard!

Clear skies, 
Darren. 

Thanks Darren, I enjoyed reading about their discoveries. 
 

michael_murphy wrote:

Great image Richard,

Will your next project be to plot the light curve

Michael.

Thanks Michael, it's on my to do list