David's Astronomy Pages Images - Session 621 (2018-08-23)

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Session Notes

C/2016 R2 (PANSTARRS) - Comet     Z And - Variable Star (Type ZAND)     NGC 6426 - Globular Cluster (Herschel II-587) NGC 6755 - Open Cluster (Herschel VII-19)     Photometric Monitoring - Variables     - RX And, U And, Z And, TT Ari, CI Cyg,     BL Lac, CY Lyr, DY Per, GK Per, ER UMa   SS Her attempt failed due to CCD frosting     Astrometric Monitoring - Nearby Stars   - Ross 248 (And HH), 61 Cyg, Groombridge 34, Teegardens Star

- Night Session (4.1 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 transfer and reporting of AllSky Cloud Measurements for current and next targets, and confirm other code was working as expected. - - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding - Ambient Temperature:  6°C (minimum) - CCD Temperature:  -15°C (77% av. power) & -20°C (85% av. power) - Notes from 2018-08-23 >>

C/2016 R2 (PANSTARRS) - Comet

C/2016 R2 (PANSTARRS) (passing through Ursa Major) Sun distance 2.84 AU, Est. Mag +15.8. The tiny galaxy at below left is PGC 2393752, catalog mag +17.4)

Annotated CCD Image (100% size, Cropped) 5 x 60s exposure (average combine), 3x3 binning, C Filter  2018-08-24 02:09 UT (#621132-36) 12" LX200R  (at f/10.4) + ST-10XME (Autoguided using TS 80mm APO + ZWO ASI178MC) (Average Guide Error 0.9" rms, PHD2)

C/2016 R2 (PANSTARRS) - Earlier Image (2017-12-13) (passing through Gemini) Sun distance 3.02 AU (Bright object in upper-left corner of the image is the +7.2 mag star HIP 22221)

CCD Image (50% size, Linear Scaling) 2 x 60s exposure (average combine), 3x3 binning, C Filter  2017-12-13 22:29h UT (#607079-80) 12" LX200R  (at f/10.4) + ST-10XME (Autoguided using TS 80mm APO + ZWO ASI178MC)

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Z And - Variable Star (Type ZAND)

Z And (Andromeda) N/W Offsets (W 3.5', N -3.7' for Z And) are now being correctly imported and applied in order to get both the variable star and the associated check & comparison stars all within the same frame

Annotated CCD Image (50% size) 3 x 5 sec exposure (average combine), 3x3 binning, C Filter 2018-07-25 01:17 UT (#621092-98) 12" LX200R  (at f/10.4) + ST-10XME

Z And - Previous Image (2018-07-25) N/W offsets held in the Targets Database where not correctly  imported with the Observing Plan and caused the images to centre Z And  within the frame but not contain the necessary comparison stars

Annotated CCD Image (50% size) 5 sec exposure (single frame), 3x3 binning, C Filter 2018-07-25 00:48 UT (#615013) 12" LX200R  (at f/10.4) + ST-10XME

Z And - Earlier Reference Image (2006)

Annotated CCD Image 30s exposure, 2x2 binning, C Filter 2006-11-18 03:07h UT (#153267) 8" LX200 + ST-7E

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NGC 6426 - Globular Cluster (Herschel  II-587)

NGC 6426 / Herschel II-587 (Ophiuchus) (Taken at Altitude 15.9, Airmass 3.6)

CCD Image (50% size) 4 x 60 sec exposure (average combine), 3x3 binning, C Filter 2018-08-24 00:12 UT (#621036-39) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 (Average Guide Error 1.7" rms, PHD2)

NGC 6426 / Herschel II-587 - detail

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

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NGC 6755 - Open Cluster (Herschel  VII-19)

NGC 6755 / Herschel VII-19 (Aquila)

CCD Image (50% size) 7 x 30 sec exposure (average combine), 3x3 binning, C Filter 2018-08-24 00:26 UT (#621046-52) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 (Average Guide Error 1.2" rms, PHD2) [ Full Size Image ]

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