David's Astronomy Pages Images - Session 1304 (2025-03-19)

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Images (S1305)

Objects

Session Notes

29P/Schwassmann-Wachmann - Comet C/2023 A3 (Tsuchinshan-ATLAS) - Comet     AT 2022acje - Transient  (non-detection) AT 2024gfh - Transient (non-detection) AT 2024wys - CV Type Transient AT 2025esv - Type CV? Transient     LEDA 924001 - Galaxy M31 - Spiral Galaxy with Transient AT 2025etj     NGC 3660 - Spiral Galaxy (UGCA 234) NGC 3981 - Spiral Galaxy (UGCA 255) NGC 4027 - Spiral Galaxy (UGCA 260, ARP 22, H II-296) NGC 5044 - Elliptical Galaxy (UGCA 341)     SN 2024adhf - Type Ia Supernova     UGCA 153 - Spiral Galaxy (PGC 25983)  (non-detection) UGCA 185 - Spiral Galaxy (PGC 28373) UGCA 221 - Spiral Galaxy (PGC 32550) UGCA 221 - Spiral Galaxy (PGC 32550) UGCA 254 - Spiral Galaxy (PGC 37373) UGCA 258 - Irregular Galaxy with Type II Supernova 2022mm     Variable Stars (photometric monitoring) - T CrB, YZ Cnc, SS Cyg, U Her, BL Lac, U Mon, NV Ori, ER UMa         Nearby Stars (astrometric monitoring) - Scholz's Star

- All night session (9.1 hr).     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -1°C (min) - CCD Temperature: -20°/-25°C - Notes from 2025-03-19 >>     - Aurora Images from 2025-03-19  >>

Observing Result

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-03-19 (passing through Leo) Sun Distance 6.27 AU (turning) Earth Distance 5.43 AU (812.1 million km)		29P/Schwassmann-Wachmann - 2025-03-19 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -11.91 arcsec/hr, Dec 3.14 arcsec/hr) Measured M2 Magnitude +15.12 (Clear Filter)
Annotated CCD Image (50% size, square root scale) 3 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 21:19 UT (#1304055-57) 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) 9 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 21:25 UT (#1304055-63) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
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) - 2025-03-20 (passing through Delphinus) Sun Distance 3.08 AU (receeding) Earth Distance 3.54 AU (529.6 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2025-03-20 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 4.17 arcsec/hr, Dec 25.70 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 10 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 03:39 UT (#1304201-10) 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 2022acje - Transient  (non-detection)

AT 2022acje (Lyra) AT 2022acje (Type: unk) discovered 2022-12-04.208 UT by ATLAS using ATLAS Haleakala Telescope Alias: ATLAS22bnmc Discovery Magnitude 16.72 (orange-ATLAS Filter) vsPrior Non-Detection Limiting Magnitude  19.46  ( TNS 2022acje )

AT 2022acje - 2025-03-20 (T+836.9d) Image below (2025-03-20.118) was taken 836.9 days after discovery of 2022acje Position of earlier transient (not visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 02:56 UT (#1304187-89) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022acje on Transients 2022 Page >>

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AT 2024gfh - Transient (Non-Detection)

AT 2024gfh (Cygnus) AT 2024gfh (Type: unk) discovered 2024-04-10.362 UT by GEOTS Alias: GEOTS-Balaji-2024-004, TCP J19445510+3846155 Discovery magnitude 16.5 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 18.0  ( TNS 2024gfh )

AT 2024gfh - 2025-03-20 (T+343.8d) Image below (2025-03-20.134) was taken 343.8 days after discovery of 2024gfh Position of earlier 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) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 03:21 UT (#1304194-98) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024gfh on Transients 2024 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 - 2025-03-20 (T+174.4d) Image below (2025-03-20.195) was taken 174.4 days after discovery of 2024wys Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +14.98 (Clear Filter) Star appears to be lying in its normal range (mag 14.3 - 15.4 G-Gaia Filter, Gaia)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 04:43 UT (#1304238-40) 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 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 - 2025-03-20 (T+2.2d) Image below (2025-03-20.077) was taken 2.2 days after discovery of 2025esv Position of reported transient (very faint) is shown by white cross-hairs Measured Magnitude +17.04 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 02:00 UT (#1304153-57) 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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LEDA 924001 - Galaxy

LEDA 924001 (Crater) Alias  PGC 924001 (catalog mag +16.8) with several other galaxies in same FOV  PGC 924613 (catalog mag +16.2),   PGC 923364 (catalog mag +16.5),  PGC 923588 (catalog mag +17.0),  PGC 924751 (catalog mag +17.6), PGC 3081810 (catalog mag ?)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 00:08 UT (#1304115-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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

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M31 - Spiral Galaxy with Transient AT 2025etj

M31 with AT 2025etj (Andromeda) AT 2025etj (Type: unk) discovered 2025-03-17.587 UT by XOSS Alias: PSP25G, PNV J00411965+4138256 Discovery Magnitude 17.51 (Clear Filter) ( TNS 2025etj )

M31 with AT 2025etj - 2025-03-20 (T+2.6d) Cam2 Reference Image Position of AT 2025etj (not visible in this image) is shown by blue circle Limits of M31 Spiral Galaxy is shown by pale blue ellipse M110 is visible in image

Annotated CMOS Image (16% size) (10s exposure, 1x1 binning) 2025-05-20 03:55 UT TS 80mm APO, ZWO ASI178MC

M31 with AT 2025etj - 2025-03-20 (T+2.6d) Position of transient (faint) is shown by white cross-hairs

Annotated CCD Image (70% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 04:07 UT (#1304224-28) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT 2025etj - 2025-03-20 (T+2.6d) Image below (2025-03-20.166) was taken 2.6 days after discovery of 2025etj Position of reported transient (faint but distinct) is shown by white cross-hairs  Measured Magnitude +16.80 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 04:07 UT (#1304224-28) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025etj  (in M31) on Transients 2025 Page >>

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NGC 3660 - Spiral Galaxy (UGCA 234)

NGC 3660 (Crater) Alias: UGCA 234 (catalog mag +12.2 or +12.8) [ UGCA Galaxies ]  with two other smaller galaxies in same FOV PGC 1000714 (catalog mag +16.3),   PGC 3081853 (catalog mag ?)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 22:51 UT (#1304088-92) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3660 / UGCA 234 - Detail

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

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

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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) 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

NGC 3981 - Detail

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

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

NGC 3981 - Later Image (2025-04-04)

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

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NGC 4027 - Spiral Galaxy (UGCA 260, ARP 22, Herschel II-296)

NGC 4027 (Corvus) Alias: UGCA 260, ARP 22, Herschel II-296 Catalog mag +11.0 or +11.7. First imaged in S416  [ UGCA Galaxies ] [ ARP Galaxies ]  [ Herschel 400 Objects ] Taken at altitude 13.1°

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 00:50 UT (#1304131-35) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4027 / UGCA 260 - Detail

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

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

NGC 4027 - Earlier Image (Mar 2010) (Altitude 10 deg)

CCD Image  (33% size) 5 x 120s exposure (average combine), 2x2 binning, C filter 2010-03-09 23:19h UT (#416336-40) 12" LX200R  (at f/9.7) + ST-10XME

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NGC 5044 - Elliptical Galaxy (UGCA 341)

NGC 5044 (Virgo) Alias: UGCA 341(catalog mag +10.8 or +11.8)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 00:50 UT (#1304131-35) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 5044 - Detail

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

Negative CCD Image (125% size, log scale, cropped) Image details as above

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SN 2024adhf - Type Ia Supernova

SN 2024adhf (Crater) Alias: In WISEA J113009.86-134449.7 SN 2024adhf (Type: Ia) discovered 2024-12-01.269 UT by GOTO Alias: GOTO24iqy, ZTF24abuvknk, Gaia25aao Discovery Magnitude 14.9 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 18.9 Confirmed SN Ia Gaia, 2024-12-04 09:47, mag 14.08 Gaia, 2025-01-01 11:19, mag 14.45  ( TNS 2024acnr | Gaia25aao )

SN 2024adhf - 2025-03-20 (T+108.8d) Image below (2025-03-20.059) was taken 108.8 days after discovery of 2024adhf Position of reported supernova (very faint) is shown by white cross-hairs Adjacent object is GSC 5515:838 (UCAC2 26890101) as possible star, but this also corresponds to catalog location of WISEA J113009.86-134449.7 (a galaxy)

Annotated CCD Image (250% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-20 01:34 UT (#1304145-49) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2024adhf - Earlier Image, 2024-12-13 (T+12.0d) Image below (2024-12-13.235) was taken 12.0 days after discovery of 2024adhf Position of reported supernova (distinct) is shown by white cross-hairs Adjacent object is GSC 5515:838 (UCAC2 26890101) as possible star, but this also corresponds to catalog location of WISEA J113009.86-134449.7 (a galaxy)

Annotated CCD Image (250% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-12-13 05:45 UT (#1282124-27) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2024adhf - Reference Image PanSTARRS image shows presence of a faint spiral galaxy at location of SN 2024adhf Unclear if SN is associated with this faint galaxy or with galaxy  WISEA J113009.86-134449.7 (sitting at same position as GSC 5515:838)

PanSTARRS DR1 Color image displayed & captured in Aladin

Images of SN 2024adhf on Supernova 2024 Page >>

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UGCA 153 - Spiral Galaxy (PGC 25983)   (non-detection)

UGCA 153 (Hydra) Alias: PGC 25983 (catalog mag +15.0)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 21:05 UT (#1304049-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 153 - Detail Position of UGCA (not visible) is shown by white circle Poor quality image / uneven sky background / uneven transparency Reschedule target for a later session.

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

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UGCA 185 - Spiral Galaxy (PGC 28373)

UGCA 185 (Hydra) Alias: PGC 28373 (catalog mag +13.6)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 21:48 UT (#1304067-70) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 185 - Detail

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

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UGCA 221 - Spiral Galaxy (PGC 32550)

UGCA 221 (Hydra) Alias: PGC 32550 (catalog mag +13.9)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 22:10 UT (#1304075-78) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 221 - Detail

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

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UGCA 254 - Spiral Galaxy (PGC 37373)

UGCA 254 (Crater) Alias: PGC 37373 (catalog mag +13.9)  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 23:23 UT (#1304101-05) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 254 - Detail

Annotated CCD Image (1Annotated CCD Image (150% size, square root scale, cropped) Image details as above

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UGCA 258 - Irregular Galaxy (PGC 37680) with Type II Supernova 2022mm

UGCA 258  (Corvus) [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 23:43 UT (#1304108-12) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 258 - Detail

CCD Image  (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 23:43 UT (#1304108-12) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 258 - Earlier Image (Mar 2023) UGCA 258 with SN 2022mm - 2022-03-05 (T+52.4d) Image below (2022-03-05.020) was taken 52.4 days after discovery of 2022mm Position of SN (faint) is shown by white cross-hairs

CCD Image  (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2022-03-05 00:38 UT (#981020-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2022mm (UGCA 258) on Supernovae 2022 Page >>

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