David's Astronomy Pages Images - Session 1358 (2025-09-05)

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Session Notes

Nova Ser 2025 (V691 Ser)     AT 2022rhq - Transient AT 2023sze - CV Type Transient  (non-detection) AT 2023vzm - Transient  (non-detection) AT 2024wys - CV Type Transient AT 2024aaxv - Type CV? Transient  (non-detection) AT 2025kml - Type CV? Transient  (non-detection) AT 2025usz - Type Nova Transient AT 2025vel - Transient  (non-detection)     NGC 797 - Spiral Galaxy with Type Ia Supernova 2025pel  (non-detection)     UGC 1206 - Galaxy with Type Ia Supernova 2025pao UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw       - C/2025 A6 (Lemmon) attempt failed (due to cloud / poor sky transparency) - M33 w/Nova M33 AT2025ofe, UGC 1325 w/SN2024aedt, UGC 1814 w/SN2025oas attempts failed (due to poor sky transparency / moonlit sky)     Variable Stars (photometric monitoring) - U And, TT Ari, T CrB, S Cyg, BL Lac     Nearby Stars (astrometric monitoring) - Barnards Star, EV Lac

- All-night session (7.3r).     - 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 2025-09-05 >>           -

Observing Result

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Nova Ser 2025 (V691 Ser)

Nova Ser 2025  (Serpens) Nova Ser 2025 discovered 2025-07-17.908 UT by New Milky Way Survey (TCP J18385851-0351482 - discovered 2025-07-17.909 UT by ZTF Alias: ZTF25abbsdyb, N Ser 2025, V691 Ser Discovery Magnitude 11.9

Nova Ser 2025 - 2025-09-05 (T+50.0d) Image below (2025-09-05.949) was taken 50.0 days after discovery of Nova Ser 2025 Position of nova (distinct but fading) is shown by white cross-hairs Measured Magnitude +14.31 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 22:49 UT (#1358065-69) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova Ser 2025 - Earlier Image, 2025-08-09 (T+23.1d) Image below (2025-08-09.997) was taken 23.1 days after discovery Position of nova (bright) is shown by white cross-hairs Measured Magnitude +12.93 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-10 00:04 UT (#1346013-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova Ser 2025 on Novae 2025 Page >>

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AT 2022rhq - Transient

AT 2022rhq (Cepheus) AT 2022rhq (Type: ulens?) discovered 2022-08-15.826 UT by Gaia Alias: Gaia22dkb Alerting Magnitude 15.02 (G-Gaia Filter) vs Historic Magnitude 15.37 +/- 0.09 SD Bright red gal.plane source candidate microlensing event or Be-type outburst rises by 0.4 mag  ( TNS 2022rhq | Gaia22dkb )

AT 2022rhq - 2025-09-06 (T+1117.2d) Image below (2025-09-06.006) was taken 1117.2 days after discovery of 2022rhq Position of reported transient (faint but distinct) is shown by white cross-hairs Measured Magnitude +15.02 (Clear Filter), (coincidentally the same mag value as the Gaia's discovery/alerting mag Looking at repeating pattern in Light Curve on the Gaia22dkb page, it would seem that the transient is more likely a Be-type variable rather than a microlensing event

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-06 00:16 UT (#1358100-04) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022rhq on Transients 2022 Page >>

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AT 2023sze - CV Type Transient  (non-detection)

AT 2023sze (Aquila) AT 2023sze (Type: CV) discovered 2023-09-18.316 UT by ATLAS using ATLAS Haleakala Telescope Alias: ATLAS23sti Discovery Magnitude 16.75 (cyan-ATLAS Filter)  ( TNS 2023sze )

AT 2023sze - 2025-09-05 (T+718.6d) Image below (2025-09-05.934) was taken 718.6 days after discovery of 2023sze Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.5 (Clear Filter),

Annotated CCD Image (100% size, linear scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 22:30 UT (#1358059-61) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023sze on Transients 2023 Page >>

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AT 2023vzm - Transient  (non-detection)

AT 2023vzm (Delphinus) AT 2023vzm (Type: unk) discovered 2023-10-29.094 UT by GEOTS using 0.36-m f/2 astrograph Telescope Alias: GEOTS-Balaji-2023-021, TCP J20170886+1310433, ZTF23abnpiqz Discovery Magnitude 15.8 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 18.0  ( TNS 2023vzm )

AT 2023vzm - 2025-09-05 (T+677.8d) Image below (2025-09-05.874) was taken 677.8 days after discovery of 2023vzm Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.8 (Clear Filter),

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 21:08 UT (#1358013-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023vzm on Transients 2023 Page >>

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AT 2024wys - CV Type Transient

AT 2024wys (Sagittarius) AT 2024wys (Type: CV) discovered 2024-09-26.821 UT by Gaia Alias: Gaia24csp Alerting magnitude 16.26 (G-Gaia Filter) vs Historic Magnitude 14.70 +/- 0.23 SD 1.6 mag dimming in erratic red source  ( TNS 2024wys | Gaia24csp )

AT 2024wys - 2025-09-05 (T+344.0d) Image below (2025-09-05.867) was taken 344.0 days after discovery of 2024wys Position of earlier transient (faint, brightening) is shown by white cross-hairs Measured Magnitude +15.04 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 20:51 UT (#1358008-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024wys on Transients 2024 Page >>

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AT 2024aaxv - Type CV? Transient  (non-detection)

AT 2024aaxv (Cygnus) AT 2024aaxv (Type: CV?) discovered 2024-11-11.619 UT by XOSS Alias: KATS24V018, TCP J20582280+3409401 Discovery Magnitude 16.94 (Clear Filter) CV candidate classified by XOSS  ( TNS 2024aaxv )

AT 2024aaxv - 2025-09-05 (T+298.3d) Image below (2025-09-05.890) was taken 298.3 days after discovery of 2024aaxv Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.2 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 21:30 UT (#1358020-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024aaxv on Transients 2024 Page >>

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NGC 797 - Spiral Galaxy with Type Ia Supernova 2025pel  (non-detection)

NGC 797 with SN 2025pel (Andromeda) SN 2025pel (Type: Ia) discovered 2025-06-17.194 UT by GOTO using GOTO-North Telescope Alias: GOTO25dpa Discovery Magnitude 18.41 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 20.20  ( TNS 2025pel )

NGC 797 with SN 2025pel - 2025-09-06 (T+80.9d) Image below (2025-09-06.056) was taken 80.9 days after discovery of 2025pel Position of reported supernova (not visible) is indicated by white cross-hairs Estimated Magnitude +17.8 (Clear Filter) Poor quality image (suboptimal sky transparency or bright sky)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-06 01:31 UT (#1358137-41) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025pel (in NGC 797) on Supernova 2025 Page >>

SN 2024jjc - Previous Supernova in NGC 797 (Andromeda) SN 2024jjc (Type: II) discovered 2024-05-26.481 UT by ZTF Alias: ZTF24aaoupov Discovery Magnitude 17.19 (r-ZTF Filter)  ( TNS 2024epz )

NGC 797 with SN 2024jjc - 2024-08-04 (T+69.6d) Image below (2024-08-04.034) was taken 69.6 days after discovery of 2024jjc Position of reported supernova (faint) is indicated by white cross-hairs. Estimated Magnitude +17.7 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-08-04 00:58 UT (#1222078-82) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024jjc (in NGC 797) on Supernova 2024 Page >>

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AT 2025kml - Type CV? Transient  (non-detection)

AT 2025kml (Pegasus) AT 2025kml (Type: CV?) discovered 2025-05-15.899 UT by XOSS Alias: PSP25I, TCP J22513664+3334177 Discovery Magnitude 16.21 (Clear Filter) [ TNS 2025kml ]

AT 2025kml - 2025-09-05 (T+113.1d) Image below (2025-09-05.990) was taken 113.1 days after discovery of 2025kml Positon of reported transient (not visible) is shown by white cross hairs.   Non-Detection Limiting Magnitude +18.8 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 23:55 UT (#1358093-97) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025kml on Transients 2024  Page >>

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AT 2025usz - Type Nova Transient

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AT 2025vel - Transient  (non-detection)

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UGC 1206 - Galaxy with Type Ia Supernova 2025pao

UGC 1206 with SN 2025pao (Pisces) SN 2025pao (Type: Ia) discovered 2025-06-26.454 UT by CRTS Alias: SNhunt473, GOTO25ein, ATLAS25gwy, ZTF25ababeev Discovery Magnitude 17.5 (V-CRTS Filter) vs Prior Non-Detection Limiting Magnitude 21.2  ( TNS 2025pao )

UGC 1206 with SN 2025pao - 2025-09-06 (T+71.6d) Image below (2025-09-06.038) was taken 71.6 days after discovery of 2025pao Position of earlier SN (not visible) is shown by white cross-hairs Non-detection Limiting Magnitude +17.5 (Clear Filter) Poor quality image (poor sky transparency / bright moonlit sky)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-06 01:03 UT (#1358130-34) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 1206 with SN 2025pao - Earlier Image, 2025-08-26 (T+61.5d) Image below (2025-08-26.989) was taken 61.5 days after discovery of 2025pao Position of reported SN (very faint) is shown by white cross-hairs Estimated Magnitude +18.2 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-26 23:53 UT (#1352058-62) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025pao (in UGC 1206) on Supernova 2025 Page >>

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UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw

UGC 10809 with SN 2025vaw (Hercules) AT 2025vaw (Type: unk) discovered 2025-08-22.925 UT by ATLAS using  ATLAS Teide Tenerife Telescope Alias: ATLAS25kew, ZTF25abkwytp Discovery magnitude 16.90 (wide-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 20.19  ( TNS 2025vaw)

UGC 10809 with SN 2025vaw - 2025-09-05 (T+14.0d) Image below (2025-09-05.911) was taken 14.0 days after discovery of 2025vaw Position of reported supernova (faint, but not fully separated from nucleus ) is shown by white cross-hairs Supernova appears to be associated with PGC 200345  (catalog mag +16.8) rather than with UGC 10058 Measured Magnitude +15.52 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-05 22:00 UT (#1358034-38) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10809 with SN 2025vaw - 2025-08-31 (T+9.0d) Image below (2025-08-31.972) was taken 9.0 days after discovery of 2025vaw Position of reported supernova (faint, but not fully separated from nucleus ) is shown by white cross-hairs Supernova appears to be associated with PGC 200345  (catalog mag +16.8) rather than with UGC 10058 Measured Magnitude +15.70 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 23:25 UT (#1354049-51) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025vaw (in UGC 10809 / PGC 200345) on Supernova 2025 Page >>

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