David's Astronomy Pages Images - Session 1318 (2025-04-30)

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Images (S1319)

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Session Notes

29P/Schwassmann-Wachmann - Comet     AT 2024accj - Type AGN Transient AT 2025fma - Type CV? Transient  (non-detection) AT 2025img - CV Type Transient     M31 - Spiral Galaxy with Nova M31 2025-04c?     NGC 2407 - Elliptical Galaxy with Type Ia Supernova 2025gmc       - UGC 5695 w/SN2025cfc & VV 410 w/SN2025hjz attempts failed (due to cloud)     Realtime Pictures from Current/Latest Session >>     Variable Stars (photometric monitoring) - T CrB, RZ LMi, BL Lac     Nearby Stars (astrometric monitoring) - Barnards Star, 61 Cyg, Groombridge 34

- Attemped all-night session (4.4 hr)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 8.5°C (min) - CCD Temperature: -10°/-15°C - Notes from 2025-04-30 >>     -

Observing Result

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29P/Schwassmann-Wachmann - Comet 

29P/Schwassmann-Wachmann - 2025-04-30 (passing through Leo) Sun Distance 6.27 AU Earth Distance 5.98 AU (895.0 million km) Poor quality image (uneven sky background)		29P/Schwassmann-Wachmann - 2025-04-30 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 3.68 arcsec/hr, Dec -1.44 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 8 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-04-30 23:21 UT (#1318037-44) 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 29P/Schwassmann-Wachmann on Comets 2023 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2024 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2025 Page >>

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AT 2024accj - Type AGN Transient

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AT 2025fma - Type CV? Transient

AT 2025fma (Cepheus) AT 2025fma (Type: CV?) discovered 2025-03-18.947 UT by XOSS Alias: KATS25F031, TCP J20412701+6308245 Discovery Mag 16.08 (Clear Filter) CV candidate classified by XOSS  ( TNS 2025fma )

AT 2025fma - 2025-05-01 (T+43.1d) Image below (2025-05-01.019) was taken 43.1 days after discovery of 2025fma Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.6 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-01 00:35 UT (#1318089-92) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025fma - Earlier Image, 2025-04-11 (T+23.1d) Image below (2025-04-11.057) was taken 23.1 days after discovery of 2025fma Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +18.25 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-11 01:31 UT (#1314128-32) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025fma on Transients 2025 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 - 2025-04-30 (T+4.2d) Image below (2025-04-30.988) was taken 4.2 days after discovery of 2025img Position of reported transient (faint) is shown by white cross-hairs Measured Magnitude +15.32 (Clear Filter) Poor quality image (uneven background / cloud, single frame)

Annotated CCD Image (100% size, square root scale, cropped) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-04-30 23:42 UT (#1318053) 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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M31 - Spiral Galaxy with Nova M31 2025-04c?

M31 with Nova M31 2025-04c? (Andromeda) Nova M31 2025-04c? (Type: unk) discovered 2025-04-16.111 UT by Kamil Hornoch et al. Alias: PNV J00433279+4116281 Discovery Magnitude 16.58 +/- 0.08  (Clear Filter)  ( Discovery Image )

M31 -Spiral Galaxy with Nova M31 2025-04c? - 2025-05-01 (T+14.9d) Cam2 Reference Image Position of Nova M31 2025-04c? (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) 2025-05-01 02:12 UT TS 80mm APO, ZWO ASI178MC

M31 -Spiral Galaxy with Nova M31 2025-04c? - 2025-05-01 (T+14.9d) Transient position (not readily distinguishable) is shown by white circle

Annotated CCD Image (70% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-01 01:22 UT (#1318119-23) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova M31 2025-04c? - 2025-05-01 (T+14.9d) Image below (2025-05-01.051) was taken 14.9 days after discovery of Nova M31 2025-04c? Position of reported transient (very faint) is shown by white cross-hairs  Estimated Magnitude +17.4 (Clear Filter

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-01 01:22 UT (#1318119-23) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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

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NGC 2407 - Elliptical Galaxy with Type Ia Supernova 2025gmc

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UGC 12293 - Spiral Galaxy with Transient AT 2025gyi

UGC 12293 with AT 2025gyi (Pegasus) AT 2025gyi (Type: unk) discovered 2025-04-07.505 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF25aalvyrp Discovery magnitude 18.36 (r-ZTF Filter)  ( TNS 2025gyi)

UGC 12293 with AT 2025gyi - 2025-05-01 (T+23.6d) Image below (2025-05-01.067) was taken 23.6 days after discovery of 2025gyi Position of reported transient (very faint) is shown by white cross-hairs Estimated Magnitude +18.5 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-05-01 01:44 UT (#1318126-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025gyi (in UGC 12293) on Transients 2025 Page >>

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