David's Astronomy Pages Images - Session 1116 (2023-04-20)

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Session Notes

C/2019 T4 (ATLAS) - Comet AT 2023vp - CV Type Transient AT 2023cuo - Type ulens? Transient     NGC 2169 - Open Cluster (Hidden Treasures 36) NGC 2175 - Open Cluster with Nebulosity (Hidden Treasures 37) NGC 5915 - Spiral Galaxy with Type Ia Supernova 2023cpt     UGC 4025 - Spiral Galaxy with Type Ia Supernova 2023boc     Variable Stars (photometric monitoring) - SS Cyg, BL Lac, CY Lyr      Nearby Stars (astrometric monitoring) -  HH And, Groombridge 34, HIP 53798

- All night session (7.0 hours). Interrupted for 2.5 hours by cloud/haar. Session commenced with Dusk Flats (C Filter, 2x2 & 3x3)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 2.5°C (min) - CCD Temperature:   -20°C - Notes from 2023-04-20 >>     -

C/2019 T4 (ATLAS) - Comet

C/2019 T4 (ATLAS) - 2023-04-21 (passing through Serpens) Sun Distance 4.97 AU Earth Distance 4.15 AU (620.2 million km)		C/2019 T4 (ATLAS) - 2023-04-21 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -13.92 arcsec/hr, Dec 24.78 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2023-04-21 01:36 UT (#1116093-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, square root scale, cropped) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2023-04-21 01:38 UT (#1116093-99) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2019 T4 (ATLAS) on Comets 2023 Page >>

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AT 2023vp - CV Type Transient

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AT 2023cuo - Type ulens? Transient

AT 2023cuo (Scutum) AT 2023cuo (Type: ulens?) discovered 2023-03-07.226 UT by Gaia Alias: Gaia23baf Alerting Magnitude 10.14 (g-GAIA Filter) vs Historic Magnitude 10.45 +/- 0.06) Bright blue gal.plane source candidate microlensing event or Be-type outburst rises by 0.3 mag  ( TNS 2023cuo | Gaia23baf)

AT 2023cuo - 2023-04-21 (T+44.9d) Image below (2023-04-21.114) was taken 44.9 days after discovery of 2023cuo Position of reported CV Transient (distinct) is shown by white cross-hairs Measured magnitude +10.77

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2023-04-21 02:50 UT (#1116147-50) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023cuo on Transients 2023 Page >>

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NGC 2169 - Open Cluster (H VIII-24, Hidden Treasures 36)

NGC 2169 (Orion) Alias: H VIII-24, Hidden Treasures 36   [ Herschel 400 Objects ]  [ Hidden Treasures ]  [ Open Star Clusters ]

Annotated CCD Image (70% size, linear scale) 9 x 30s exposure (average combine), 3x3 binning, Clear Filter 2023-04-20 21:51 UT (#1116062-70) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2175 - Open Cluster with Nebulosity (Hidden Treasures 37)

NGC 2175 (Orion) Hidden Treasures 37   [ Hidden Treasures ]  [ Open Star Clusters ]

Colour CMOS Image (17% size, asinh stretched, cropped) 50 x 20s exposure (stacked), 1x1 binning, gain 250 2023-04-20 22:09 UT (#Set1, 23_01_35) TS 80mm APO, ZWO ASI178MC & PHD2 Auto-guided using 12" LX200R (at f/10.4) + ST-10XME [ Larger Image, 36% size ] Frames acquired using SharpCap Processed & displayed using SiriL 1.0.6 / 1.2.0

NGC 2175 - Monochrome ( Red )

CMOS Image (17% size, asinh stretched, R, cropped ) Monochrome (Red) Image details as above

NGC 2175 - Detail, Monochrome (Red)

CMOS Image (17% size, asinh stretched, R, cropped, with extra Stretched in PaintShop Pro to highlight nebulosity) Image details as above

Negative CMOS Image (17% size, asinh stretched, R, cropped, with extra Stretched in PaintShop Pro to highlight nebulosity) Image details as above

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NGC 5915 - Spiral Galaxy with Type Ia Supernova 2023cpt

NGC 5915 with SN 2023cpt (Libra) SN 2023cpt (Type: Ia, z=0.00758) discovered 2023-02-27.356 UT by ATLAS Alias: ATLAS23cxk Discovery Mag 17.10 (cyan-ATLAS filter)  ( Rochester Supernova site | TNS 2023cpt )

NGC 5915 with SN 2023cpt - 2023-04-21 (T+52.7d) Image below (2023-04-21.050) was taken 52.7 days after discovery of 2023cpt Position of reported SN (faint but distinct) is shown by white cross-hairs

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2023-04-21 01:21 UT (#1116086-90) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023cpt (NGC 5915) on Supernova 2023 Page >>

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UGC 4025 - Spiral Galaxy with Type Ia Supernova 2023boc

UGC 4025 with SN 2023boc (Canis Minor) SN 2023boc (Type: Ia) discovered 2023-02-12.234 UT by ZTF Alias: ZTF23aacfiuv Discovery Mag 18.00 (r-ZTF filter)  ( Rochester Supernova site | TNS 2023boc )

UGC 4025 with SN 2023boc - 2023-04-20 (T+67.7d) Image below (2023-04-20.937) was taken 67.7 days after discovery of 2023boc Position of reported SN (faint) is shown by white cross-hairs

Annotated CCD Image (150% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2023-04-20 22:33 UT (#1116075-76) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023boc (UGC 4025) on Supernova 2023 Page >>

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