David's Astronomy Pages Images - Session 1357 (2025-09-04)

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Session Notes

C/2017 K2 (PANSTARRS) - Comet  (non-detection) C/2024 E1 (Wierzchos) - Comet C/2025 A6 (Lemmon) - Comet     AT 2022arp - CV Type Transient  (non-detection) AT 2022vyq - CV Type Transient  (non-detection) AT 2023ct - CV Type Transient AT 2023yga - Type YSO Transient AT 2025lc - CV Type Transient AT 2025md - CV Type Transient, V1948 Cyg AT 2025voc - Type CV? Transient AT 2025wbs - Type CV? Transient  (non-detection)     NGC 6802 - Open Cluster     SN 2025jtq - Type II Supernova in WISEA Galaxy (PGC 134730) SN 2025taz - Type Ia Supernova in WISEA Galaxy (PGC 166556)     UGCA 23 - Spiral Galaxy (PGC 7806)     Realtime Pictures from Current/Latest Session >>     Variable Stars (photometric monitoring) - TBA     Nearby Stars (astrometric monitoring) - None

- All-night session (6.3hr). Initial part of session delayed & interrupted by cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature : 9°C (min). - CCD Temperature:  -10°/ -15°C - Notes from 2025-09-04 >>           -

Observing Result

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C/2017 K2 (PANSTARRS) - Comet (non-detection)

C/2017 K2 (PANSTARRS) -  2025-09-05 (passing through Gemini) Sun Distance 9.46 AU (receeding) C/2017 K2 (PANSTARRS) - 2025-09-05 Earth Distance 9.78 AU (1463.8 million km)		C/2017 K2 (PANSTARRS) - 2025-09-05 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -16.87 arcsec/hr, Dec 5.28 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 5 x 120s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 00:12 UT (#1357076-80) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (125% size, square root scale, cropped) Image details as left
Images of C2017 K2 (PANSTARRS) on Comets 2021 Page >>
Images of C2017 K2 (PANSTARRS) on Comets 2022 Page >>
Images of C2017 K2 (PANSTARRS) on Comets 2023 Page >>
Images of C2017 K2 (PANSTARRS) on Comets 2024 Page >>
Images of C2017 K2 (PANSTARRS) on Comets 2025 Page >>

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C/2024 E1 (Wierzchos) - Comet

C/2024 E1 (Wierzchos) - 2025-09-04 (passing through Corona Borealis) Sun Distance 2.49 AU (approaching) Earth Distance 2.57 AU (385.1 million km)		C/2024 E1 (Wierzchos) - 2025-09-04 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 10.80 arcsec/hr, Dec -66.76 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-04 22:57 UT (#1357039-41) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) Image details as left
Images of C/2024 E1 (Wierzchos) on Comets 2025 Page >>

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C/2025 A6 (Lemmon) - Comet

C/2025 A6 (Lemmon) - 2025-09-05 (passing through Gemini) Sun Distance 1.42 AU (approaching) Earth Distance 1.91 AU (285.0 million km)		C/2025 A6 (Lemmon) - 2025-09-05 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 72.90 arcsec/hr, Dec 27.08 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 02:51 UT (#1357147-49) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, log scale, cropped) 15 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 02:58 UT (#1357147-61) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2025 A6 (Lemmon) on Comets 2025 Page >>

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 AT 2022arp - CV Type Transient  (non-detection)

AT 2022arp (Cygnus) AT 2022arp (Type: CV) discovered 2022-01-29.585 UT by GEOTS using 0.36-m f/2 astrograph telescope Alias: GEOTS-2022-001 Discovery Mag 15.7 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 18.0  ( TNS 2022arp )

AT 2022arp - 2025-09-05 (T+1314.5d) with HIP 100587 (catalog mag +4.43)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 02:16 UT (#1357124-28) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022arp - 2025-09-05 (T+1314.5d) Image below (2025-09-05.092) was taken 1314.5 days after discovery of 2022arp Position of reported transient (distinct) is shown by white cross-hairs Non-Detection Limiting Magnitude 18.7

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 02:16 UT (#1357124-28) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022arp on Transients 2022 Page >>

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AT 2022vyq - CV Type Transient  (non-detection)

AT 2022vyq (Cygnus) AT 2022vyq (Type: CV) discovered 2022-09-25.008 UT by Gaia Alias: Gaia22eah, ASASSN-14av Discovery Mag 16.80 (G-Gaia Filter) vs Historic Magnitude 20.39 +/- 0.48 SD Outburst in candidate CV ASASSN-14av  ( TNS 2022vyq | Gaia22eah )

AT 2022vyq - 2025-09-04 (T+1076.0d) Image below (2025-09-04.972) was taken 1076.0 days after discovery of 2022vyq Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-04 23:22 UT (#1357056-60) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022vyq on Transients 2022 Page >>

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AT 2023ct - CV Type Transient

AT 2023ct (Vulpecula) AT 2023ct (Type: CV) discovered 2023-01-06.215 UT by Gaia Alias: Gaia23adp Alerting Magnitude 15.33 (G-Gaia Filter) vs Historic Magnitude 16.68 +/- 0.42 SD Erratic source shows brightening event: candidate YSO/CV?  ( TNS 2023ct | Gaia23adp )

AT 2023ct - 2025-09-05 (T+972.9d) Image below (2025-09-05.069) was taken 972.9 days after discovery of 2023ct Position of reported transient (very faint) is shown by white cross-hairs Measured Magnitude +17.21 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 01:43 UT (#1357110-14) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023ct on Transients 2023 Page >>

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AT 2023yga - Type YSO Transient

AT 2023yga (Sagitta) AT 2023yga (Type: YSO) discovered 2023-11-19.768 UT by Gaia Alias: Gaia23dhi Alerting Magnitude 16.74 (G-Gaia Filter) vs Historic Magnitude 18.02 +/- 0.56 SD Erratic source shows brightening event: candidate YSO/CV?  ( TNS 2023yga | Gaia23dhi )

AT 2023yga - 2025-09-04 (T+655.2d) Image below (2025-09-04.944) was taken 655.2 days after discovery of 2023yga Position of reported transient (not easily visible at this image scale) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-04 22:45 UT (#1357035-37) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2023yga - 2025-09-04 (T+655.2d) - Detail Image below (2025-09-04.944) was taken 655.2 days after discovery of 2023yga Position of reported transient (very faint) is shown by white cross-hairs Estimated Magnitude +17.7 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-04 22:45 UT (#1357035-37) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023yga on Transients 2023 Page >>

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AT 2025lc - CV Type Transient

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AT 2025md - CV Type Transient, V1948 Cyg

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AT 2025voc - Type CV? Transient

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AT 2025wbs - Type CV? Transient

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NGC 6802 - Open Cluster

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SN 2025jtq - Type II Supernova in WISEA Galaxy (PGC 134730)

SN 2025jtq (Cetus) Alias: In WISEA J005731.88-172146.9 / PGC 134730 SN 2025jtq (Type: II) discovered 2025-05-04.420 UT by ASAS-SN using ASASSN-Cassius Telescope Alias: ASASSN-25bs Discovery Magnitude 15.90 (g-Sloan Filter) vs Prior Non-Detection Limiting Magnitude 16.8  ( TNS 2025jtq )

SN 2025jtq - 2025-09-05 (T+123.7d) Image below (2025-09-05.135) was taken 123.7 days after discovery of 2025jtq Position of reported supernova (distinct) is shown by white cross-hairs Poor quality image (poor sky transparency / light cloud)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 03:22 UT (#1357166-70) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2025jtq - Earlier Image 2025-08-17 (T+104.7d) Image below (2025-08-17.076) was taken 104.7 days after discovery of 2025jtq Position of reported supernova (distinct) is shown by white cross-hairs Measured Magnitude, Gal. Centre & SN +15.60 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-17 01:57 UT (#1350094-98) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025jtq (in WISEA Galaxy) on Supernova 2025 Page >>

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SN 2025taz - Type Ia Supernova in WISEA Galaxy (PGC 166556)

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UGCA 23 - Spiral Galaxy (PGC 7806)

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