David's Astronomy Pages Images - Session 590 (2015-10-29)

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Images (S591)

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Session Notes

M27 - Planetary Nebula (Dumbbell Nebula), attempt     Photometric Monitoring - Variables   - R CrB, BL Lac, FG Sge, U Sge, V Sge, WZ Sge - Z And, CI Cyg, SS Cyg, U Her attempts failed (poor sky/link failure)     Astrometric Monitoring - Nearby Stars   - Barnards Star - 61 Cyg attempt failed (poor sky/link failure)

- Late night session (1.5 hrs duration) - Session operated under semi-automated control, with remote monitoring from indoors computer.   - Ambient Temperature:  temperature gradually falling from 6°C to minimum of 4°C (minimum) by end of session - CCD operation -15°C (at 46% average cooling).  - Planned objectives of the session were to monitor selected variable stars & nearby stars and acquire images of selected gallery objects. - Raw FIT files were originally mislaid, but were found again and processed on 2019-08-16

M27 - Planetary Nebula (Dumbbell Nebula), Attempt

M27 (Vulpecula) Attempted imaging of M27 nebula failed due to multiple issues a) poor telescope tracking (only 1 out of 5 frames usable) b) poor sky transparency c) poor flat field (obvious large dust mote) (compare best frame with this image with the earlier image 2012)

CCD Image (50% size) 60s exposure (single frame), 3x3 binning, C Filter 2015-10-29 19:59 UT (#590280) 12" LX200R (at f/10.4) + ST-10XME

M27 - Earlier Image (2012)

CCD Image (35% size) 3  x 60s exposure (average combine), 2x2 binning, C Filter  2012-11-02 18:31 hUT (#520003-07) 12" LX200R  (at f/9.7) + ST-10XME [ Full Size Image ]

M27 - Earlier Detail (2012)

CCD Image (60% size, cropped) Image details as above [ Full Size Image ]

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