David's Astronomy Pages Images - Session 1024 (2022-08-04)

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C/2017 K2 (PANSTARRS) - Comet     NGC 6701 - Spiral Galaxy with Transient AT 2022nxe NGC 6745 - Spiral Galaxy with Type IIn Supernova 2022prr NGC 6888 - Nebula (Caldwell 27)       - C/2021 O3 (PANSTARRS) attempt failed (due to failed guiding/lost star)     Variable Stars (photometric monitoring) - RX And, Z And, SS Cyg, BL Lac      Nearby Stars (astrometric monitoring) - HH And, 61 Cyg, Groombridge 34, EV Lac

- All night session (3.9 hours) - A number of targets were affected by poor image guiding due to PHD2 autoselecting very faint guide stars, with SNR as low as 4-5 which were too easily lost (fixed mid-session by setting minimum guide star SNR to 50).     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 7°C (min) - CCD Temperature:  -10°/-15°C - Notes from 2022-08-04 >>

C/2017 K2 (PANSTARRS) - Comet

C/2017 K2 (PANSTARRS) (passing through Scorpius) Sun Distance 2.47 AU (approaching) Earth Distance 1.89 AU (283.1 million km)		C/2017 K2 (PANSTARRS) - 2022-08-04 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -51.08 arcsec/hr, Dec -62.18 arcsec/hr) Images taken with comet sitting at altitude +7.4°
Annotated CCD Image (50% size, square root scale) 3 x 45s exposure (average combine), 3x3 binning, Clear Filter 2022-08-04 23:14 UT (#1024007-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (100% size, log scale, cropped) 7 x 45s exposure (average combine), 3x3 binning, Clear Filter 2022-08-04 23:16 UT (#1024007-15) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C2017 K2 (PANSTARRS) on Comets 2021 Page >>
Images of C2017 K2 (PANSTARRS) on Comets 2022 Page >>

C/2017 K2 (PANSTARRS)  - False Colour Image Inverse Spectrum

C/2017 K2 (PANSTARRS)  -  2022-08-04 (image affected by light artefact in lower right)

False Colour CCD Image (70% size, log scale) 7 x 45s exposure (average combine), 3x3 binning, Clear Filter 2022-08-04 23:16 UT (#1024007-15) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 6701 - Spiral Galaxy with Transient AT 2022nxe

NGC 6701 with AT 2022nxe (Draco) AT 2022nxe (Type: unk) discovered 2022-06-29.860 UT by Jan Ovidiu Tercu, Gabriel Cristian Neagu  (GLO) ( Galati Astronomical Observatory of the Natural Sciences Museum Complex Galati, Romania ) Discovery magnitude +15.8 (R)  ( TNS 2022nxe )

NGC 6701 with AT 2022nxe - 2022-08-05 (T+36.2d) Image below (2022-08-05.058) was taken 36.2 days after discovery of 2022nxe Position of reported transient (visible ?) is shown by white cross-hairs Measured magnitude ? (unable to determine using SExtractor)

Annotated CCD Image (150% size,  square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2022-08-05 01:32 UT (#1024075-78) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6701 - Reference Image Magenta cross-hairs drawn at the coordinates of AT 2022nxe Apart from the bright arm on the galaxy the reference image doesn't appear to any obvious object at the AT 2022nxe coordinates Transient is therefore consider to be confirmed. The TNS 2022nxe web page still shows the object type as  'Unknown' as of 2022-08-10.

PanStarrs Reference Image captured from Aladin display

Images of AT 2022nxe (NGC 6701) on Transients 2022 Page

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NGC 6745 - Spiral Galaxy with Type IIn Supernova 2022prr

NGC 6745 with SN 2022prr (Lyra) SN 2022prr (Type: IIn) discovered 2022-07-27.300 UT by ASAS-SN Alias: ASASSN-22jne Discovery Mag +17.3  ( Rochester Supernova site | TNS 2022prr )

NGC 6745 with SN 2022prr (T+8.7d)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2022-08-05 00:03 UT (#1024027-31) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6745 with SN 2022prr - 2022-08-04 (T+8.7d) Image below (2022-08-04.996) was taken 8.7 days after discovery of 2022prr Position of SN (bright) is shown by white cross-hairs Measured magnitude +14.92

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2022-08-05 00:03 UT (#1024027-31) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6745 - Spiral Galaxy (Ref Image)

Reference Image (SDSS Image captured from Aladin)

Images of SN 2022prr (NGC 6745) on Supernovae 2022 Page >>

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NGC 6888 - Nebula (Caldwell 27)

NGC 6888 (Cygnus) Alias: Caldwell 27 Mosaic 1 x 2

Annotated CCD Image Mosaic (70% size, square root scale) 2 x ( 2 x 90s) exposure (average combine), 3x3 binning, Clear Filter 2022-08-05 00:26 UT (#1024034-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6888 - Earlier Image (2010)

CCD Image (linear scale, 35% size) 3 x 60s exposure (average combine), 3x3 binning, C Filter 2010-08-20 22:07 hUT (#423073-75) 12" LX200R  (at f/9.7) + ST-10XME [ Full Size ]

NGC 6888 - Earlier Image (2005)

CCD Image Mosaic (54% size) 60s exposure, C Filter 2005-09-03 02:07 h UT (#93213-15) 8" LX200 Classic + ST-7E [ Full Size ]

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