David's Astronomy Pages Images - Session 1310 (2025-04-03)

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Session Notes

29P/Schwassmann-Wachmann - Comet C/2023 A3 (Tsuchinshan-ATLAS) - Comet     AT 2022vdr - CV Type Transient AT 2023gvj - Transient AT 2024efi - CV Type Transient  (non-detection) AT 2024wqx - Transient  (non-detection) AT 2025euu - Type CV? Transient AT 2025ghv - Type CV? Transient AT 2025gnb - Transient   (non-detection)     ESO 565-G19 - Galaxy with Type Ia Supernova 2025efc IC 4479 - Spiral Galaxy with Type Ia Supernova 2024afpi  (non-detection) M85 - Elliptical Galaxy     NGC 3450 - Spiral Galaxy (UGCA 218) NGC 3521 - Spiral Galaxy with Type Ic Supernova 2024aecx  (non-detection) NGC 3981 - Spiral Galaxy (UGCA 255) NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw     UGCA 245 - Spiral Galaxy (PGC 36643) UGCA 319 - Irregular Galaxy (PGC 44982) UGC 9503 - Spiral Galaxy (ARP 64)     Variable Stars (photometric monitoring) - T CrB, BL Lac, ER UMa     Nearby Stars (astrometric monitoring) - None

- All-Night Session (7.6 hr)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 1.5°C (min) - CCD Temperature: -20°C - Notes from 2025-04-03 >>     - Aurora Images from 2025-04-03 / 2025-04-04  >>

Observing Result

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-04-03 (passing through Leo) Sun Distance 6.27 AU (turning ?) Earth Distance 5.59 AU (836.7 million km)		29P/Schwassmann-Wachmann - 2025-04-03 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -6.73 arcsec/hr, Dec 1.70 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 8 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 22:03 UT (#1310037-45) 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) - 2025-04-04 (passing through Delphinus) Sun Distance 3.27 AU (receeding) Earth Distance 3.54 AU (529.8 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2025-04-04 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -5.37 arcsec/hr, Dec 26.81 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 03:39 UT (#1310155-57) 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) 10 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 03:41 UT (#1310155-64) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
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 2022vdr - CV Type Transient

AT 2022vdr (Orion) AT 2022vdr (Type: CV) discovered 2022-09-20.378 UT by MASTER Alias: MASTER OT J052749.27+064639.1 Discovery Mag 14.8 (Clear Filter)  ( TNS 2022vdr )

AT 2022vdr - 2025-04-03 (T+926.5d) Image below (2025-04-03.858) was taken 926.5 days after discovery of 2022vdr Position of reported transient (distinct) is shown by white cross-hairs Measured magnitude +13.41

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 20:38 UT (#1310007-11) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022vdr on Transients 2022 Page >>

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AT 2023gvj - Transient

AT 2023gvj (Libra) AT 2023gvj (Type: unk) discovered 2023-04-15.420 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF23aagpbdv Discovery Mag 13.88 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.23 This is a high proper motion star  ( TNS 2023gvj )

AT 2023gvj - 2025-04-04 (T+719.6d) Image below (2025-04-04.020) was taken 719.6 days after discovery of 2023gvj Position of reported transient (distinct) is shown by white cross-hairs Measured magnitude +13.94

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 00:36 UT (#1310093-96) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023gvj on Transients 2023 Page >>

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AT 2024efi - CV Type Transient  (non-detection)

AT 2024efi (Libra) AT 2024efi (Type: CV) discovered 2024-03-10.805 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia24axu Alerting Magnitude 15.38 (G-Gaia Filter) vs Normal Magnitude 18.8 - 20.0  TNS 2024efi | Gaia24axu )

AT 2024efi - 2025-04-04 (T+389.3d) Image below (2025-04-04.109) was taken 389.3 days after discovery of 2024efi Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.2 Star is presumed to be at its low state (mag 18.8 to 20.0, Gaia)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 02:41 UT (#1310134-38) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024efi on Transients 2024 Page >>

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AT 2024wqx - Transient  (non-detection)

AT 2024wqx (Hercules) AT 2024wqx (Type: unk) discovered 2024-09-26.890 UT by GOTO using GOTO-North Telescope Alias: GOTO24ghk, Gaia24cvq Discovery Magnitude 16.54 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.9 Apparently hostless transient  TNS 2024wqx | Gaia24cvq )

AT 2024wqx - 2025-04-04 (T+189.2d) Image below (2025-04-04.094) was taken 189.2 days after discovery of 2024wqx Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.2

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 02:25 UT (#1310127-31) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024wqx on Transients 2024 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 - 2025-04-03 (T+15.3d) Image below (2025-04-03.944) was taken 15.3 days after discovery of 2025euu Position of reported transient (barely separable) is shown by white cross-hairs

Annotated CCD Image (200% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 22:47 UT (#1310057-61) 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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AT 2025ghv - Type CV? Transient

AT 2025ghv (Gemini) AT 2025ghv (Type: CV?) discovered 2025-03-31.589 UT by XOSS Alias: PSP25H, TCP J06455595+1210577 Discovery Magnitude 14.88 (Clear Filter)  ( TNS 2025ghv )

AT 2025ghv - 2025-04-03 (T+3.3d) Image below (2025-04-03.897) was taken 3.3 days after discovery of 2025ghv Position of reported transient (faint) is shown by white cross-hairs Estimated Magnitude +16.0 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 21:41 UT (#1310030-34) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025ghv on Transients 2025 Page >>

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AT 2025gnb - Transient

AT 2025gnb (Gemini) AT 2025gnb (Type: unk) discovered 2025-04-02.782 UT by MASTER Alias: MASTER OT J074640.62+173413.1 Discovery Magnitude 16.20 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 19.9  ( TNS 2025gnb )

AT 2025gnb - 2025-04-03 (T+1.1d) Image below (2025-04-03.869) was taken 1.1 days after discovery of 2025gnb Position of reported transient (faint) is shown by white cross-hairs Measured Magnitude +16.91 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 20:58 UT (#1310015-18) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025gnb on Transients 2025 Page >>

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ESO 565-G19 - Galaxy with Type Ia Supernova 2025efc

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IC 4479 - Spiral Galaxy with Type Ia Supernova 2024afpi  (non-detection)

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M86 - Elliptical Galaxy

M86 (Virgo)    [ Messier Objects ] with small adjacent galaxies PGC 40659 (catalog mag +16.7), PGC 40641 (catalog mag +17.3) ,  PGC 169281 (catalog mag +18.1)

Annotated CCD Image (100% size, log scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 01:27 UT (#1310105-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M86 - Detail

Annotated CCD Image (70% size, log root scale, cropped) Image details as above

M86 - Earlier Image (Mar 2004)

CCD  Image, 5 x 60 sec exposure (summed) 2004-03-29  00:23 h UT (#64171-74) 8" LX200 Classic + ST-7E

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NGC 3450 - Spiral Galaxy (UGCA 218)

NGC 3450 (Hydra) Alias: UGCA 218 Catalog mag +11.9 or +12.5. Low Dec -20d 50m  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 22:27 UT (#1310052-54) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3450 - Detail

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

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NGC 3521 - Spiral Galaxy with Type Ic Supernova 2024aecx  (non-detection)

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NGC 3981 - Spiral Galaxy (UGCA 255)

NGC 3981 (Crater) Alias: UGCA 255 (catalog mag +11.0 or +12.5)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 00:17 UT (#1310085-89) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3981 - Detail

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

UGCA 255 - Earlier Image (2025-03-20)

Annotated CCD Image (125% size, square root scale, cropped) 7 x 120s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 00:30 UT (#1304122-28) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw

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UGCA 245 - Spiral Galaxy (PGC 36643)

UGCA 245 (Crater) Alias: PGC 36643 (catalog mag +14.4)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 23:09 UT (#1310064-68) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 245 - Detail

Annotated CCD Image (150% size, square root scale, cropped) Image details as above

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UGCA 319 - Irregular Galaxy (PGC 44982)

UGCA 319 (Virgo) Alias: PGC 44982 (catalog mag +15.0)  [ UGCA Galaxies ]  [ Irregular Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 23:32 UT (#1310071-75) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 319 - Detail

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

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UGC 9503 - Spiral Galaxy (ARP 64)

UGC 9503 (Bootes) Alias: ARP 64 [ ARP Galaxies ]  with several adjacent galaxies in same FOV PGC 52675 (catalog mag +15.1), PGC 214323  (catalog mag +16.5),  PGC 1591189 (catalog mag +16.5),  PGC 1590568 (catalog +16.7), PGC 1595320 (catalog mag +17.1)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-04 02:59 UT (#1310141-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

ARP 64 - Detail UGC 9503 - Spiral Galaxy with small companion (LED 214322) on arm (another small companion lies at end of the other arm)

Annotated CCD Image (150% size, square root scale, cropped) Image details as above

Annotated CCD Image (150% size, square root scale, cropped) Image details as above

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