David's Astronomy Pages Images - Session 1354 (2025-08-31)

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Session Notes

Saturn - Planet     C/2022 N2 (PANSTARRS) - Comet C/2023 C2 (ATLAS) - Comet C/2024 E1 (Wierzchos) - Comet     Nova Ser 2025 (V691 Ser)     AT 2022fnb - CV Type Transient AT 2023cgz - Transient  (non-detection) AT 2023ugt - CV Type Transient AT 2023abtv - CV Type Transient AT 2025fwb - Type CV? Transient AT 2025imo - Type CV? Transient  (non-detection) AT 2025mmq - Type CV? Transient  (non-detection) AT 2025ndz - Type CV? Transient  (non-detection) AT 2025rut - Type CV? Transient  (non-detection) AT 2025usz - Type Nova Transient     NGC 7753 - Spiral Galaxy with Type Ia Supernova 2025kyg     SN 2024aeey - Type Ia Supernova     UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw       - AT2024accj attempt failed (due to cloud)      Variable Stars (photometric monitoring) - T CrB, BL Lac, CY Lyr     Nearby Stars (astrometric monitoring) - None

- All night session (6.0 hr), windy.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature : 14.5°C (min). - CCD Temperature:  -10°C - Notes from 2025-08-31 >>     -

Observing Result

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Saturn - Planet

Saturn - 2025-09-01 (passing through Pisces) Sun Distance 9.56 AU Earth Distance 8.61 AU (1,287.9 million km) (Ra -9.54 arcsec/hr, Dec -4.46 arcsec/hr)

Saturn

Annotated CCD Image (150% size, square root scale, cropped) 3 x 0.11s exposure (average combine), 3x3 binning, V Filter 2025-09-01 00:45 UT (#1354087-94) 12" LX200R (at f/10.4) + ST-10XME

Saturn with moons  Image is shown with a contrast that highlights the main moons of Saturn Insert shows Saturn with a contrast that highlights the planet (at expense of the moons)

Annotated CCD Image (150% size, linear scale, cropped) 3 x 0.11s exposure (average combine), 3x3 binning, V Filter 2025-09-01 00:45 UT (#1354087-94) 12" LX200R (at f/10.4) + ST-10XME

Saturn with moons (annotated) - Composite Image Magnitudes from TheSky6 Body    Mag Note  Saturn    0.7   Titan    8.4    Rhea    9.8    Dione    10.2  not visible (v. close to planet)  Tethys    10.3    Iapetus    11.2  not visible  Enceladus    11.8  not visible  Mimas    13.0  not visible Hyperion    14.3  not visible (out of view)

Annotated CCD Image (50% size, square root scale, cropped) Image details as above

Saturn Poor quality image (due to wind / few frames)

Annotated Colour CCD Image (150% size, linear scale, cropped) Colour Combined (approximate colour, BVR, Unsharp Masked - um5) Blue :  1 x 0.3s exposure (single frame), 1x1 binning, B Filter Green: 1 x 0.3s exposure (single frame), 1x1 binning, V Filter Red:   2 x 0.3s exposure (average combine), 1x1 binning, R Filter 2025-09-01 00:47 UT (#1354099-109) 12" LX200R (at f/10.4) + ST-10XME

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C/2022 N2 (PANSTARRS) - Comet

C/2022 N2 (PANSTARRS) - 2025-08-31 (passing through Aries) Sun Distance 3.84 AU (receeding) Earth Distance 3.49 AU (521.8 million km)		C/2022 N2 (PANSTARRS) - 2025-08-31 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 19.75 arcsec/hr, Dec 8.55 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 22:36 UT (#1354024-29) 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 C/2022 N2 (PANSTARRS) on Comets 2025 Page >>

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C/2023 C2 (ATLAS) - Comet

C/2023 C2 (ATLAS) - 2025-09-01 (passing through Cassiopeia) Sun Distance 3.86 AU (receeding) Earth Distance 3.35 AU (501.4 million km)		C/2023 C2 (ATLAS) - 2025-09-01 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -46.00 arcsec/hr, Dec 10.02 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-01 00:18 UT (#1354074-77) 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 C2 (ATLAS)  on Comets 2025 Page >>

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C/2024 E1 (Wierzchos) - Comet

C/2024 E1 (Wierzchos) - 2025-08-31 (passing through Corona Borealis) Sun Distance 2.55 AU Earth Distance 2.60 AU (388.4 million km)		C/2024 E1 (Wierzchos) - 2025-08-31 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 6.77 arcsec/hr, Dec -65.74 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 23:45 UT (#1354059-61) 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/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 - 2025-08-31 (T+45.0d) Image below (2025-08-31.921) was taken 45.0 days after discovery of nova Position of nova (distinct but fading) is shown by white cross-hairs Measured Magnitude +14.00 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 22:09 UT (#1354012-16) 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 2022fnb - CV Type Transient

AT 2022fnb (Cepheus) AT 2022fnb (Type: CV) discovered 2022-03-30.875 UT by MASTER Alias: MASTER OT J222553.47+602042.5 Discovery magnitude 13.2 (Clear filter) vs Last Non-Detection at limiting mag 18.9  ( TNS 2022fnb)

AT 2022fnb - 2025-09-01 (T+1250.2d) Image below (2025-09-01.085) was taken 1250.2 days after discovery of 2022fnb Position of earlier reported transient (fading) is shown by white cross-hairs Measured magntitude + 12.79 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-01 02:06 UT (#1354144-48) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022fnb - Earlier Image, 2023-07-22 (T+479.1d) Image below (2023-07-22.990) was taken 479.1 days after discovery of 2022fnb Position of earlier reported transient (fading slowly but still distinct) is shown by white cross-hairs Measured magntitude + 13.17 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2023-07-22 23:49 UT (#1123022-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022fnb - Reference Image (DSS2 Color)

Images of AT 2022fnb on Transients 2022 Page >>

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AT 2023cgz - Transient

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AT 2023ugt - CV Type Transient

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AT 2023abtv - CV Type Transient

AT 2023abtv (Pegasus) AT 2023abtv (Type: CV) discovered 2023-12-26.986 UT by Gaia Alias: Gaia23duv Discovery magnitude 12.07 (G-Gaia Filter) vs Historic Magnitude 13.38 +/- 0.57 (SD) Gaia and WISE source brightens by 2 mag  ( TNS 2023abtv | Gaia23duv )

AT 2023abtv - 2025-09-01 (T+614.1d) Image below (2025-09-01.109) was taken 614.1 days after discovery of 2023abtv Position of reported transient (distinct, brightening again) is shown by white cross-hairs Measured Magnitude +11.88 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-01 02:40 UT (#1354158-62) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023abtv on Transients 2023 Page >>

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AT 2025fwb - Type CV? Transient

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

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

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

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

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AT 2025usz - Type Nova Transient

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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 - 2025-08-31 (T+102.5d) Image below (2025-08-31.905) was taken 102.5 days after discovery of 2025kyg Position of reported supernova (faint) is shown by white cross-hairs Estimated Magnitude +18.3 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 21:52 UT (#1354005-09) 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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SN 2024aeey - Type Ia Supernova

SN 2024aeey (Draco) SN 2024aeey (Type: Ia) discovered 2024-12-15.090 UT by Gaia Alias: Gaia24dri, GOTO25fy, ATLAS25ake Discovery Magnitude 15.56 (G-Gaia Filter) Candidate SN near PanSTARRS galaxy  ( TNS 2024aeey | Gaia24dri )

SN 2024aeey - 2025-08-31 (T+259.9d) Image below (2025-08-31.954) was taken 259.9 days after discovery of 2024aeey Position of earlier supernova (very faint) is shown by white cross-hairs Measured Magnitude +19.08 (Clear Filter)

Annotated CCD Image (100% size, scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-31 23:03 UT (#1354041-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2024aeey - Earlier Image, 2024-12-24 (T+9.7d) Image below (2024-12-24.831) was taken 9.7 days after discovery of 2024aeey Position of reported supernova (distinct) is shown by white cross-hairs  Measured Magnitude +15.62 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-12-24 20:05 UT (#1287045-49) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024aeey on Supernovae 2024 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 - 2025-08-31 (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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