David's Astronomy Pages CCD Images - Session 620 (2018-08-21)

Images (S619)

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Images (S621)

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Session Notes

R CrB - RCB variable star     Photometric Monitoring - Variables     - None    (R CrB attempted but failed due to software interruption & cloud)     Astrometric Monitoring - Nearby Stars     - None

- Attempted Evening Session (10 mins duration). Initially clear , but clouds quickly rolled in. Wind 15 mph+ - Very short session using Fully Automated operation until session was halted by developing cloud and wind (Session was monitored from within the observatory initially and then remotely from indoors). - Main aim of the session was intended to be test recent bug fix and fine-tuning in my AllSky Software (running on AllSky/Weather computer) to correctly display telescope status, location and next targets (running on Main Observatory Computer). Secondary aims were to acquire images of a selection of deep sky, variable star & nearby star targets. - Dome shutter chain came off the Shutter Drive Sprocket during the session and left the Drive Motor running and believing that it was still opening the shutter. Luckily it wasn't - the shutter was shut.  - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding - Ambient Temperature:  16°C (minimum) increasing to 17 - CCD Temperature:  -10°C (72% av. power) - Notes from 2018-08-21 >>

R CrB  - RCB Variable Star

R CrB (Corona Borealis) Locate Image following initial slew Targeting a point at offset of W -2.0', N 3.5' from R CrB in order to also pick up TT CrB, the image has a pointing error of W: -0.77', N: 2.37', meaning that R CrB lies just off the bottom of this image. (Software interruption and then cloud prevented final target centering and acquisition of main images)

CCD Image (50% size) 10 sec exposure (single frame), 3x3 binning, C Filter 2018-08-21 21:22 UT (#620001) 12" LX200R  (at f/10.4) + ST-10XME

RCrB - reference image (2008)

Annotated CCD Image 3 x 30s exposure (average combine), 2x2 binning, C Filter  2008-05-02 23:32 UT (#285071-73) 8" LX200 + ST-7E

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