David's Astronomy Pages Images - Session 1321 (2025-05-07)

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Session Notes

144P/Kushida - Comet  (non-detection)     AT 2023apa - CV Type Transient  (non-detection) AT 2025img - CV Type Transient AT 2025jpj - CV Type Transient     NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw       - 29P/Schwassmann-Wachmann attempt failed (due to thin cloud &  variable / uneven sky background)     Variable Stars (photometric monitoring) - T CrB, U Her     Nearby Stars (astrometric monitoring) - None

- Post midnight session (2.5 hr)     - 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 2025-05-07 >>     -

Observing Result

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144P/Kushida - Comet   (non-detection)

144P/Kushida - 2025-05-08 (passing through Libra) Sun Distance 4.15 AU (receeding) Earth Distance 3.15 AU (471.8 million km)		144P/Kushida - 2025-05-08 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -30.03 arcsec/hr, Dec 7.90 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-05-08 00:30 UT (#1321029-32) 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) Image details as left
Images of 144P/Kushida on Comets 2009 Page >>
Images of 144P/Kushida on Comets 2023 Page >>
Images of 144P/Kushida on Comets 2024 Page >>

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AT 2023apa - CV Type Transient  (Non-Detection)

AT 2023apa (Hercules) AT 2023apa (Type: CV) discovered 2023-01-25.079 UT by MASTER Alias: MASTER OT J174235.17+200502.8 Discovery magnitude 16.9 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 20.4  ( TNS 2023apa )

AT 2023apa - 2025-05-08 (T+834.0d) Image below (2025-05-08.050) was taken 834.0 days after discovery of 2023apa Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude + 19.4 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-05-08 01:15 UT (#1321063-67) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023apa 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 - 2025-05-08 (T+11.2d) Image below (2025-05-08.013) was taken 11.2 days after discovery of 2025img Position of earlier transient (faded & no longer visiblet) is shown by white cross-hairs Non-Detection Limiting Magnitude +17.5 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-05-08 00:20 UT (#1321022-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025img - Earlier Image, 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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AT 2025jpj - CV Type Transient

AT 2025jpj (Lyra) AT 2025jpj (Type: CV) discovered 2025-05-03.765 UT by XOSS Alias: KATS25J001, TCP J18473499+2905579 Discovery Mag 16.39 (Clear Filter) CV candidate classified by XOSS  ( TNS 2025jpj )

AT 2025jpj - 2025-05-08 (T+4.3d) Image below (2025-05-08.056) was taken 4.3 days after discovery of 2025jpj Position of reported  transient (very faint) is shown by white cross-hairs Measured Magnitude +17.26 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-08 01:27 UT (#1321070-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025jpj on Transients 2025 Page >>

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NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw

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