David's Astronomy Pages Images - Session 623 (2018-08-31)

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Images (S624)

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Session Notes

37P/Forbes - Comet     NGC 6803 - Planetary Nebula     Photometric Monitoring - Variables     - RX And, U And, Z And, R CrB, CI Cyg,     S Cyg, SS Cyg, AM Her, U Her, BL Lac, CY Lyr, DY Per, GK Per, FG Sge   V Sge attempt failed (aborted)     Astrometric Monitoring - Nearby Stars   - Ross 248 (And HH), 61 Cyg, Groombridge 34, Teegardens Star

- Night Session (3.5 hours duration). - Fully Automated operation  (Session was monitored remotely from indoors to observe and intervene if required). - Main aim of the session was to acquire images of a selection of variable stars, nearby stars, star clusters and deep sky targets. Secondary aims were to test recent software fixes & modifications of the Observatory Control Program (CCDApp2). - - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding - Ambient Temperature:  12°C (minimum) - CCD Temperature:  -15°C (94% av. power) - Notes from 2018-08-31 >>

37P/Forbes - Comet

37P/Forbes (passing through star-field in Pisces) Sun Distance 1.98 AU Comet is marked by white cross hairs

Annotated CCD Image (50% size) 5 x 60 sec exposure (average combine), 3x3 binning, C Filter 2018-08-31 23:09 UT (#623111-15) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

37P/Forbes - detail

Annotated CCD Image (100% size, cropped) Image details as above

Negative CCD Image (100% size, cropped) Image details as above

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NGC 6803 - Planetary Nebula

Object in Sky Tour, p84 Ast Now Aug 2017

NGC 6803 (Aquila) PL.Neb is marked by white cross hairs

Annotated CCD Image (50% size) 4 x 60 sec exposure (average combine), 3x3 binning, C Filter 2018-08-31 21:11 UT (#623010-13) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6803 - detail NGC 6803 lies at centre of image below, but it appears very stellar like with no indication of it being a Pl. Neb

CCD Image (100% size, linear scale, cropped) Image details as above

CCD Image (100% size, log scale, cropped) Image details as above

NGC 6803 - spectroscopic image Compared to adjacent stars which display normal spectroscopic continuums NGC 6803's spectrum is very different and comprises two principal points of high intensity which is typical of planetary nebula whose light is principally made up of emission lines at just a few discrete wavelengths (in the boxes below zero order image it on the left whilst 1st order image lies to the right).  The 1st order image of NGC 6803 with two principle points of lights is overlaid onto the zero order image of an adjacent star.

Annotated CCD Image (100% size, rotated, cropped) 3 x 90 sec exposure (average combine), 3x3 binning, S Filter (star analyser 100) 2018-08-31 21:11 UT (#623016-18) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

CCD Image (50% size) Image details as above

NGC 6803 - Earlier Image (2002) Star-field surrounding NGC 6803 Planetary Nebula (Aquila)

CCD Image (100% size) 5 x 30 sec exposure.  2x2 binning,  (#25013-18) 2002-09-12 22:04 to 22:09h UT 8" LX200 + ST-7E CCD Camera

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