Observation by John Hughes: Messier 97
Uploaded by
John Hughes
Observer
John Hughes
Observed
2021 Feb 28 - 21:35
Uploaded
2021 Mar 03 - 21:52
Objects
M97
Planetarium overlay
Constellation
Ursa Major
Field centre
RA: 11h14m
Dec: +55°01'
Position angle: +2°51'
Field size
0°33' × 0°26'
Equipment
- StellaLyra RC8
- ZWO ASI1600mm Pro Cool
- SkyWatcher EQ6R-Pro
- Chroma 1.25” 3nm Ha filter
Exposure
300 s exposure, Gain 139, Offset 30
Location
North Essex
Target name
Messier 97
Title
Messier 97
About this image
Last year I purchased a 8 inch Ritchey Chretien scope and have spent several months trying to get it collimated. In the end I reset the primary mirror, collimated as close as I could by eye using a Cheshire then made the remaining adjustments using an out of focus star.
A subsequent test run was undertaken capturing Messier 97 shown here. The image was then uploaded to Astrometry.net to see whether the native focal length was out or not. Thankfully the report back revealed a focal length of 1,604 mm compared to a factory setting of 1,600 mm. I will take that result.
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