David's Astronomy Pages Images - Session 1320 (2025-05-05)

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Session Notes

104P/Kowal - Comet  (non-detection) C/2022 E2 (ATLAS) - Comet     AT 2023jtw - Type ulens Transient  (non-detection) AT 2025img - CV Type Transient     ARK 479 - Galaxy with Type Ia Supernova 2024agly M31 - Spiral Galaxy with Nova M31 2025-04a? M31 - Spiral Galaxy with Nova M31 2025-04c? M31 - Spiral Galaxy with Nova M31 2025-04d?  (non-detection)     NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw     UGC 10058 - Spiral Galaxy with Type II Supernova 2025gvs       - 29P/Schwassmann-Wachmann attempt failed (due to uneven sky background)     Variable Stars (photometric monitoring) - T CrB, AM Her, BL Lac     Nearby Stars (astrometric monitoring) - HH And (Ross 248)

- All-night session (4.4 hr)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:1°C (min) - CCD Temperature: -20°/-25°C - Notes from 2025-05-05 >>     -

Observing Result

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104P/Kowal - Comet  (non-detection)

104P/Kowal - 2025-05-06 (passing through Sagittarius) Sun Distance 5.26 AU (receeding) Earth Distance 4.49 AU (671.3 million km)		104P/Kowal - 2025-05-06, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -15.32 arcsec/hr, Dec 2.64 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 01:57 UT (#1320104-08) 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 above
Images of 104P/Kowal on Comets 2022 Page >>

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C/2022 E2 (ATLAS) - Comet

C/2022 E2 (ATLAS) - 2025-05-06 (passing through Andromeda) Sun Distance 4.21 AU (receeding) Earth Distance 5.00 AU (748.4 million km)		C/2022 E2 (ATLAS) - 2025-05-06 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 12.09 arcsec/hr, Dec 7.26 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 5 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 01:42 UT (#1320094-98) 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/2022 E2 (ATLAS) on Comets 2023 Page >>
Images of C/2022 E2 (ATLAS) on Comets 2024 Page >>
Images of C/2022 E2 (ATLAS) on Comets 2025 Page >>

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AT 2023jtw - Type ulens Transient (non-detection)

AT 2023jtw (Scutum) AT 2023jtw (Type: ulens) discovered 2023-05-30.834 UT by XOSS Alias: KATS23K001, TCP J18265948-1217262 Discovery Mag +13.20 (Clear Filter) Microlens event candidate classified by XOSS.   ( TNS 2023jtw )

AT 2023jtw - 2025-05-06 (T+706.3d) Image below (2025-05-06.090) was taken 706.3 days after discovery of 2023jtw Position of earlier transient (faded / not visible) is shown by white cross-hairs

Annotated CCD Image (125% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 02:16 UT (#1320112-15) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT2023jtw on Transients 2023 Page >>

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AT 2025img - CV Type Transient

AT 2025img (Leo) AT 2025img (Type: CV) discovered 2025-04-26.795 UT by MASTER Alias: MASTER OT J105835.04+054705.5 Discovery Mag 16.2 (Other Filter) vs Prior Non-Detection Limiting Magnitude 20.1 Likely progenitor is identified as DR3 3816231274612268544 in the GAIA DR3 database (g-mag of 20.428), implying a brightness increase of approximately 5 magnitudes (Δmag ≈ 5.2). This feature and its spectrum suggest  a cataclysmic variable (CV).  ( TNS 2025img )

AT 2025img - 2025-05-05 (T+9.2d) Image below (2025-05-05.985) was taken 9.2 days after discovery of 2025img Position of reported transient (faint) is shown by white cross-hairs Measured Magnitude +15.86 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-05-05 23:41 UT (#1320042-46) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025img on Transients 2025 Page >>

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ARK 479 - Galaxy with Type Ia Supernova 2024agly

ARK 479 with SN 2024agly (Serpens) SN 2024agly (Type: Ia) discovered 2024-12-31.530 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF24acahvpc Discovery Magnitude 16.93 (r-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot  ( TNS 2024agly )

ARK 479 with SN 2024agly - 2025-05-05 (T+125.4d) Image below (2025-05-05.956) was taken 125.4 days after discovery of 2024agly Position of reported SN (not separately distinguishable, likely faded) is indicated by white cross-hairs.

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-05-05 22:56 UT (#1320021) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024agly (in ARK 479) on Supernova 2024 Page >>

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M31 - Spiral Galaxy with Nova M31 2025-04a?

M31 with Nova M31 2025-04a? (Andromeda) Nova M31 2025-04a? (Type: unk) discovered 2025-04-16.120 UT by Kamil Hornoch et al. Alias: PNV J00423788+4107427 Discovery Magnitude 16.4 (R Filter)  ( Discovery Image )

Nova M31 2025-04a? - 2025-05-06 (T+19.9d) Cam2 Reference Image Position of Nova M31 2025-04a? (not visible in this exposure) is shown by blue circle Limits of M31 Spiral Galaxy is shown by white ellipse

Annotated CMOS Image (16% size) (10s exposure, 1x1 binning) 2025-05-06 00:30 UT TS 80mm APO, ZWO ASI178MC

M31 -Spiral Galaxy with Nova M31 2025-04a? - 2025-05-06 (T+19.9d) Transient position (not readily distinguishable) is shown by white circle

Annotated CCD Image (70% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 00:44 UT (#1320067-71) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova M31 2025-04a? - 2025-05-06 (T+19.9d) Image below (2025-05-06.024) was taken 19.9 days after discovery of Nova M31 2025-04a? Position of reported transient (very faint) is shown by white cross-hairs  Estimated Magnitude +17.8 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 00:44 UT (#1320067-71) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova M31 2025-04a? (in M31) on Transients 2025 Page >>

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M31 - Spiral Galaxy with Nova M31 2025-04c?

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M31 - Spiral Galaxy with Nova M31 2025-04d?  (non-detection)

M31 with Nova M31 2025-04d? (Andromeda) Nova M31 2025-04d? (Type: unk) discovered 2025-04-20.107 UT by Kamil Hornoch et al. Alias: PNV J00430092+4119021 Discovery Magnitude 18.1 (R Filter)  ( Discovery Image )

Nova M31 2025-04d? - 2025-05-06 (T+15.9d) Cam2 Reference Image Position of Nova M31 2025-04d? (not visible) is shown by blue circle Limits of M31 Spiral Galaxy is shown by white ellipse

Annotated CMOS Image (16% size) (10s exposure, 1x1 binning) 2025-05-06 00:54 UT TS 80mm APO, ZWO ASI178MC

M31 -Spiral Galaxy with Nova M31 2025-04d? - 2025-05-06 (T+15.9d) Position of Transient (not distinguishable) is shown by white circle

Annotated CCD Image (70% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 01:06 UT (#1320075-78) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova M31 2025-04d? - 2025-05-06 (T+15.9d) Image below (2025-05-06.041) was taken 15.9 days after discovery of Nova M31 2025-04d? Position of reported transient (not visible) is shown by white cross-hairs  Non-DetectionLimiting Magnitude +17.8 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-06 01:06 UT (#1320075-78) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova M31 2025-04d? (in M31) on Transients 2025 Page >>

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NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw

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UGC 10058 - Spiral Galaxy with Type II Supernova 2025gvs

UGC 10058 with SN 2025gvs (Corona Borealis) SN 2025gvs (Type: II) discovered 2025-04-05.502 UT by ATLAS Alias: ATLAS25dpm Discovery magnitude 17.59 (cyan-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 17.7  ( TNS 2025gvs)

UGC 10058 with SN 2025gvs - 2025-05-05 (T+30.5d) Image below (2025-05-05.966) was taken 30.5 days after discovery of 2025gvs Position of reported supernova (distinct) is shown by white cross-hairs Measured Magnitude +15.45 (Clear Filter)

Annotated CCD Image (175% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-05 23:18 UT (#1320026-29) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025gvs (in UGC 10058) on Supernova 2025 Page >>

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