David's Astronomy Pages Images - Session 1305 (2025-03-23)

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Images (S1306)

Objects	Session Notes
29P/Schwassmann-Wachmann - Comet C/2023 A3 (Tsuchinshan-ATLAS) - Comet     AT 2022uam - CV Type Transient AT 2025oj - CV Type Transient  (non-detection) AT 2025esv - Type CV? Transient AT 2025esx - Type CV? Transient AT 2025euu - Type CV? Transient         Variable Stars (photometric monitoring) - T CrB, BL Lac         Nearby Stars (astrometric monitoring) - None	- Late night session (5.4 hr) following early cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 1°C (min) - CCD Temperature: -20° - Notes from 2025-03-23 >>     -

Observing Result

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-03-24 (passing through Leo) Sun Distance 6.27 AU (slowly receeding) Earth Distance 5.47 AU (818.1 million km)		29P/Schwassmann-Wachmann - 2025-03-24 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -10.61 arcsec/hr, Dec 2.79 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 9 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 00:16 UT (#1305016-24) 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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C/2023 A3 (Tsuchinshan-ATLAS) - Comet

C/2023 A3 (Tsuchinshan-ATLAS) - 2025-03-24 (passing through Delphinus) Sun Distance 3.13 AU (receeding) Earth Distance 3.54 AU (530.2 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2025-03-24 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 1.81 arcsec/hr, Dec 26.09 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 10 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 03:22 UT (#1305089-98) 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/2023 A3 Tsuchinshan-ATLAS on Comets 2024 Page >>
Images of C/2023 A3 Tsuchinshan-ATLAS on Comets 2025 Page >>

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AT 2022uam - CV Type Transient

AT 2022uam (Ophiuchus) AT 2022uam (Type: CV) discovered 2022-09-10.493 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia22dvo Alerting Magnitude 15.48 (G-Gaia Filter) vs Historic Magnitude  16.85 +/- 0.34 SD Outburst in known CV  ( TNS 2022uam | Gaia22dvo )

AT 2022uam - 2025-03-24 (T+925.6d) Image below (2025-03-24.091) was taken 925.6 days after discovery of 2022uam Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +16.92 (Clear Filter) Star seems to be within its normal range (16.2 to 17.5 G-Gaia Filter, Gaia)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 02:14 UT (#1305063-67) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022uam on Transients 2022 Page >>

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AT 2025oj - CV Type Transient (non-detection)

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AT 2025esv - Type CV? Transient

AT 2025esv (Cygnus) AT 2025esv (Type: CV?) discovered 2025-03-17.910 UT by XOSS Alias: KATS25F002, TCP J19584776+4119174 Discovery Magnitude 16.93 (Clear Filter)  ( TNS 2025esv )

AT 2025esv - 2025-03-24 (T+6.2d) Image below (2025-03-24.099) was taken 6.2 days after discovery of 2025esv Position of reported transient (very faint, fading) is shown by white cross-hairs Measured Magnitude +17.46 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 02:29 UT (#1305070-73) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025esv on Transients 2025 Page >>

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AT 2025esx - Type CV? Transient

AT 2025esx (Serpens) AT 2025esx (Type: CV?) discovered 2025-03-17.918 UT by XOSS Alias: KATS25F004, TCP J18050011-1130188 Discovery Magnitude 15.68 (Clear Filter)  ( TNS 2025esx )

AT 2025esx - 2025-03-24 (T+6.3d) Image below (2025-03-24.176) was taken 6.3 days after discovery of 2025esx Position of reported transient (very faint) is shown by white cross-hairs Estimated Magnitude +17.6 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 04:20 UT (#1305116-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025esx on Transients 2025 Page >>

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AT 2025euu - Type CV? Transient

AT 2025euu (Perseus) AT 2025euu (Type: CV?) discovered 2025-03-19.629 UT by XOSS Alias: KATS25F011, TCP J03453451+4157182 Discovery Magnitude 13.84 (Clear Filter)  ( TNS 2025euu )

AT 2025euu - 2025-03-24 (T+4.4d) Image below (2025-03-24.035) was taken 4.4 days after discovery of 2025euu Position of reported transient (barely separable) is shown by white cross-hairs Estimated Magnitude +15.0 (Clear Filter)

Annotated CCD Image (200% size, linear scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-24 00:55 UT (#1305034-36) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025euu on Transients 2025 Page >>

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