David's Astronomy Pages Images - Session 1366 (2025-09-25)

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Session Notes

C/2024 E1 (Wierzchos) - Comet     Nova Ser 2025 (V691 Ser)     AT 2023eu - CV Type Transient AT 2023cqw - Type ulens? Transient AT 2023uqd - Type YSO? Transient (near V0669 Cep & LDN 1196) AT 2023xvp - Transient  (non-detection) AT 2024vk - Type YSO? Transient AT 2024xpy - Type BL Transient AT 2024aane - Transient  (non-detection) AT 2025wxe - Type CV? Transient AT 2025xdz - Type CV? Transient  (non-detection) AT 2025xea - Type CV? Transient  (non-detection)     M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe  (non-detection) M33 - Spiral Galaxy with Transient AT2025yal  (non-detection)     NGC 7331 - Spiral Galaxy with Type Ia Supernova 2025rbs NGC 7623 - Spiral Galaxy (Part of Pegasus I Galaxy Group) NGC 7753 - Spiral Galaxy with Type Ia Supernova 2025kyg     UGC 3458 - Spiral Galaxy with Type II Supernova 2025yao UGC 10058 - Spiral Galaxy with Type II Supernova 2025gvs UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw             Variable Stars (photometric monitoring) -T CrB, BL Lac, CY Lyr, DY Per     Nearby Stars (astrometric monitoring) - HH And, 61 Cyg,

- All-night session (9.2 hr), interrupted in part by cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 12.5°C (min). - CCD Temperature:  -10°C - Notes from 2025-09-25 >>           -

Observing Result

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C/2024 E1 (Wierzchos) - Comet

C/2024 E1 (Wierzchos) - 2025-09-25 (passing through Serpens) Sun Distance 2.20 AU (approaching) Earth Distance 2.47 AU (369.1 million km)		C/2024 E1 (Wierzchos) - 2025-09-25 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 29.09 arcsec/hr, Dec -70.24 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 20:28 UT (#1366023-26) 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) 6 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 20:28 UT (#1366023-29) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2024 E1 (Wierzchos) on Comets 2025 Page >>

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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 - 2025-09-25 (T+69.9d) Image below (2025-09-25.838) was taken 69.9 days after discovery of Nova Ser 2025 Position of nova (fading) is shown by white cross-hairs Measured Magnitude +15.27 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 20:09 UT (#1366013-16) 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 2023eu - CV Type Transient

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AT 2023cqw - Type ulens? Transient

AT 2023cqw (Cygnus) AT 2023cqw (Type: ulens?) discovered 2023-02-26.439 UT by Gaia Alias: Gaia23awr Alerting Magnitude 14.24 (G-Gaia Filter) vs Historic Magnitude 14.52 +/- 0.08 SD Bright gal.plane source candidate microlensing event or Be-type outburst rises by 0.3 mag [ TNS 2023cqw | Gaia23awr ]

AT 2023cqw - 2025-09-25 (T+942.5d) Image below (2025-09-25.944) was taken 942.5 days after discovery of 2023cqw Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude +14.19

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 22:49 UT (#1366075-79) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023cqw on Transients 2023 Page >>

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AT 2023uqd - Type YSO? Transient

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AT 2023xvp - Transient  (non-detection)

AT 2023xvp (Lyra) AT 2023xvp (Type: unk) discovered 2023-11-15.119 UT by ZTF Alias: ZTF23abrhyiz Discovery Magnitude 15.94 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.4 (g-ZTF Filter)  ( TNS 2023xvp)

AT 2023xvp - 2025-09-25 (T+680.9d) Image below (2025-09-25.981) was taken 680.9 days after discovery of 2023xvp Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +17.8 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 23:41 UT (#1366098-102) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023xvp on Transients 2023 Page >>

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AT 2024vk - Type YSO? Transient

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AT 2024xpy - Type BL Transient

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AT 2024aane - Transient  (non-detection)

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AT 2025wxe - Type CV? Transient

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

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

AT 2025xea (Aquila) AT 2025xea(Type: CV?) discovered 2025-09-09.637 UT by Ziyang Mai using C8HD F/7 Telescope Discovery magnitude 16.35 (Clear Filter) Possible CV in Aql  ( TNS 2025xea )

AT 2025xea - 2025-09-25 (T+16.3d) Image below (2025-09-25.913) was taken 16.3 days after discovery of 2025xea Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.7 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 22:03 UT (#1366061-65) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025xea - Earlier Image, 2025-09-16 (T+7.3d) Image below (2025-09-16.919) was taken 7.3 days after discovery of 2025xea Position of reported transient (faint) is shown by white cross-hairs Measured Magnitude +17.48 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-16 22:11 UT (#1363076-79) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025xea on Transients 2025 Page >>

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M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe  (non-detection)

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M33 - Spiral Galaxy with Transient AT2025yal (non-detection)

M33 with AT 2025yal (Triangulum) AT 2025yal (Type: CV) discovered 2025-09-20.000 UT by Marco Lorrai using 0.25m telescope. Discovery Magnitude 18.0 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 19.0 (Clear Filter) ( TNS 2025yal )

M33 with AT 2025yal - 2025-09-26 (T+6.2d) Cam2 Reference Image Position of AT 2025yal (not visible) is shown by blue circle Limits of M33 Spiral Galaxy is shown by pale blue ellipse

Annotated CMOS Image (16% size) (10s exposure, 1x1 binning) 2025-09-26 04:12 UT TS 80mm APO, ZWO ASI178MC

M33 with AT 2025yal - 2025-09-26 (T+6.2d) Image below (2025-09-26.178) was taken 6.2 days after discovery of 2025yal Transient position (not visible) is shown by white cross-hairs Poor Quality Image (poor sky transparency

Annotated CCD Image (70% size, square root scale) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 04:20 UT (#1366182-86) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M33 with AT 2025yal - 2025-09-26 (T+6.2d) Image below (2025-09-26.178) was taken 6.2 days after discovery of 2025ya Position of reported transient (not visible) is shown by white cross-hairs  Non-Detection Limiting Magnitude +18.6 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 04:20 UT (#1366182-86) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025yal (in M33) on Transients 2025 Page >>

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NGC 7331 - Spiral Galaxy with Type Ia Supernova 2025rbs

NGC 7331 with SN 2025rbs (Pegasus) SN 2025rbs (Type: Ia) discovered 2025-07-14.141 UT by GOTO using GOTO-North Telescope Alias: GOTO25evh, ATLAS25hsl, PS25feg, ZTF25abbgajq Discovery Magnitude 17.07 (L-Goto Filter) vs Prior Non-Detection Limiting Magnitude 20.1  ( TNS 2025rbs )

NGC 7331 with SN 2025rbs - 2025-09-26 (T+73.9d) Image below (2025-09-26.042) was taken 73.9 days after discovery of 2025rbs Position of reported supernova (faint & fading) is shown by white cross-hairs Estimated Magnitude +13.8 (Clear Filter)

Annotated CCD Image (125% size, log scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 01:08 UT (#1366130-34) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 7331 with SN 2025rbs - Earlier Image, 2025-08-03 (T+19.9d) Image below (2025-08-03.016) was taken 19.9 days after discovery of 2025rbs Position of reported supernova (distinct) is shown by white cross-hairs Measured Magnitude +12.08 (Clear Filter)

Annotated CCD Image (125% size, log scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-03 00:30 UT (#1345057-60) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025rbs (in NGC 7331) on Supernova 2025 Page >>

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NGC 7623 - Spiral Galaxy (Part of Pegasus I Galaxy Group)

NGC 7623 (Pegasus) Alias: Part of Pegasus I Galaxy Group Ast.Now Deep Sky Challenge, Oct 2025  [ Deep Sky Challanges (Ast.Now) ]

CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 03:11 UT (#1366166-69) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 7623 - Detail

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 03:11 UT (#1366166-69) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 7753 - Spiral Galaxy with Type Ia Supernova 2025kyg

NGC 7753 with SN 2025kyg (Pegasus) SN 2025kyg (Type: Ia) discovered 2025-05-21.430 UT by ATLAS using Palomar 1.2m Oschin Telescope Alias: ATLAS25fee, ZTF25aaqhnsd, GOTO25dby Discovery Magnitude 15.72 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 18.25  ( TNS 2025kyg )

NGC 7753 with SN 2025kyg - 2025-09-26 (T+127.7d) Image below (2025-09-26.101) was taken 127.7 days after discovery of 2025kyg Position of reported supernova (faint) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.0 (Clear Filter) vs Prior Estimated Magnitude  +18.3 (Clear Filter, 2025-08-31 Poor quality image (cloud/poor sky transparency, clear filter)

Annotated CCD Image (125% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-09-26 02:26 UT (#1366157) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 7753 with SN 2025kyg - Earlier Image, 2025-08-17 (T+87.6d) Image below (2025-08-17.061) was taken 87.6 days after discovery of 2025kyg Position of reported supernova (faint) is shown by white cross-hairs Estimated Magnitude +17.8 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-17 01:35 UT (#1350087-91) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025kyg (in NGC 7753) on Supernova 2025 Page >>

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UGC 3458 - Spiral Galaxy with Type II Supernova 2025yao

UGC 3458 with SN 2025yao (Camelopardalis) SN 2025yao (Type: II) discovered 2025-09-20.446 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF25absindv Discovery Magnitude 18.37 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.32  ( TNS 2025yao )

UGC 3458 with SN 2025yao - 2025-09-26 (T+5.6d) Image below (2025-09-26.012) was taken 5.6 days after discovery of 2025yao Position of reported supernova (faint) is shown by white cross-hairs Measured Magnitude +16.54 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-26 00:25 UT (#1366118-22) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025yao (in UGC 3458) on Supernova 2025 Page >>

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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 - 2025-09-25 (T+173.4d) Image below (2025-09-25.866) was taken 173.4 days after discovery of 2025gvs Position of reported supernova (faint fading slowly ?) is shown by white cross-hairs Estimated Magnitude (~ Limiting Magnitude) +17.4 (Clear Filter) Very poor image (cloud/poor sky transparency)

Annotated CCD Image (175% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 20:55 UT (#1366040-44) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10058 with SN 2025gvs - Earlier Image, 2025-04-10 (T+4.6d) Image below (2025-04-10.069) was taken 4.6 days after discovery of 2025gvs Position of reported supernova (distinct, brightening) is shown by white cross-hairs Measured Magnitude +15.86 (Clear Filter)

Annotated CCD Image (175% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-10 01:47 UT (#1313110-13) 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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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 - 2025-09-25 (T+34.0d) Image below (2025-09-25.964) was taken 34.0 days after discovery of 2025vaw Position of reported supernova (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.5 (Clear Filter) vs Prior Measured Magnitude 15.89 (Clear Filter, T+24.9d)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-25 23:17 UT (#1366091-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10809 & PGC 200345 with SN 2025vaw - Earlier Image, 2025-08-26 (T+4.0d) Image below (2025-08-26.934) was taken 4.0 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 +15.49 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-26 22:33 UT (#1352029-33) 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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