Sunday, October 11, 2020

Breezy Night at Harvard

On 10/8 I travelled to Harvard, MA on a hunch the gusty winds would die down and clouds clear by the time I started imaging. Astronomical twilight was just after 8 PM. By that time it was still breezy but not gusty prompting me to leave the dew cap off to eliminate its 'sail' effect. While this reduced wind's effect it also allowed some late evening dew to form and stray light pollution from passing cars. 

Targets included IC1396 which I actually missed 😕, IC5146, M13, NGC6888, NGC7293 (Helix Nebula) and Sharpless 155.  NGC7293 was plagued by apparent light pollution in its low southern location.  Of the listed targets only IC5146, M13, NGC6888 and Sharpless 155 are worth showing below. NGC 6888 continues to be a tough target for me even with 300s exposures and directly overhead. At only 120s exposures NGC 5146 and Sharpless 155 were surprisingly accessible. I might try 300s exposures on Sharpless 155 in the future to bring out more nebulosity. 

UPDATE: I now know that it's better to acquire a bunch of 30s to 60s exposures for the equivalent time of 120s to 300s exposures.

M13

NGC 5146

NGC 6888 (Crescent Nebula)

Sharpless 155

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