David's Astronomy Pages Images - Session 1311 (2025-04-06)

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Images (S1311)

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Session Notes

29P/Schwassmann-Wachmann - Comet     AT 2025euu - Type CV? Transient AT 2025fdr - Type CV? Transient  (non-detection) AT 2025fwg - Transient  (non-detection) AT 2025gcz - Type CV? Transient  (non-detection)     2MFGC 13744 - Galaxy with Type II Supernova 2024afyu M84 - Elliptical Galaxy     NGC 3956 - Spiral Galaxy (UGCA 251) NGC 5068 - Spiral Galaxy (UGCA 345) NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw NGC 6106 - Spiral Galaxy with Type Ib Supernova 2024ahv     UGCA 277 - Irregular Galaxy (PGC 39395) UGC 3355 - Spiral Galaxy with Type Ia Supernova 2025dbx UGC 10058 - Spiral Galaxy with Type II Supernova 2025gvs UGC 10913 - Spiral Galaxy with Transient AT 2025hy     Variable Stars (photometric monitoring) - T CrB, BL Lac, RR Lyr         Nearby Stars (astrometric monitoring) - None

- All-Night Session (7.2 hr)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 4.5°C (min) - CCD Temperature: -15°/-20°C - Notes from 2025-04-06 >>     -

Observing Result

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-04-06 (passing through Leo) Sun Distance 6.27 AU (turning ?) Earth Distance 5.63 AU (842.4 million km)		29P/Schwassmann-Wachmann - 2025-04-06 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -5.60 arcsec/hr, Dec 1.37 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 7 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 21:40 UT (#1311019-27) 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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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 - 2025-04-06 (T+18.2d) Image below (2025-04-06.867) was taken 18.2 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) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 20:58 UT (#1311005-09) 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 2025fdr - Type CV? Transient (non-detection)

AT 2025fdr (Virgo) AT 2025fdr (Type: CV?) discovered 2025-03-21.653 UT by Isao Endoh Alias: TCP J12362370+1118570 Discovery Magnitude 13.84 (Clear Filter)  ( TNS 2025fdr )

AT 2025fdr (T+16.3d) Spiral galaxies (NGC 4567 & 4568) in same FOV

Annotated CCD Image (50% size, linear scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 23:30 UT (#1311068-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025fdr - 2025-04-06 (T+16.3d) Image below (2025-04-06.974) was taken 16.3 days after discovery of 2025fdr Position of reported transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.2 (Clear Filter)

Annotated CCD Image (200% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 23:30 UT (#1311068-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025fdr on Transients 2025 Page >>

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AT 2025fwg - Transient (non-detection)

AT 2025fwg (Hercules) AT 2025fwg (Type: unk) discovered 2025-03-26.967 UT by LAST Discovery Magnitude 15.96 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 21.84  ( TNS 2025fwg )

AT 2025fwg - 2025-04-07 (T+11.1d) Image below (2025-04-07.040) was taken 11.1 days after discovery of 2025fwg Position of report transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.5  (Clear Filter)

Annotated CCD Image (50% size, linear scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 01:06 UT (#1311151-55) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025fwg on Transients 2025 Page >>

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

AT 2025gcz (Ursa Major) AT 2025gcz (Type: CV?) discovered 2025-03-27.887 UT by GOTO using GOTO-North Telescope Alias: GOTO25bhx Discovery Magnitude 15.41 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 18.0  ( TNS 2025gcz )

AT 2025gcz - 2025-04-06 (T+10.0d) Image below (2025-04-06.910) was taken 10.0 days after discovery of 2025gcz Position of report transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.8  (Clear Filter)

Annotated CCD Image (50% size, linear scale) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-04-06 21:51 UT (#1311032) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025gcz on Transients 2025 Page >>

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2MFGC 13744 - Galaxy with Type II Supernova 2024afyu

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M84 - Elliptical Galaxy

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NGC 3956 - Spiral Galaxy (UGCA 251)

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NGC 5068 - Spiral Galaxy (UGCA 345)

NGC 5068 (Virgo) Alias: UGCA 345 (Catalog mag +9.8 or +10.6) [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 00:16 UT (#1311106-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 5068 - Detail

Annotated CCD Image (100% size, square root scale, cropped) Image details as above

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

NGC 5068 - Earlier Image with  Luminous Red Nova AT 2020hat (Apr 2020) AT2020hat (Type LRN, luminous red nova) discovered 2020/04/12.475 by ATLAS  (Rochester Supernova site |  K. Itagaki image  mag +17.9 at 2020/04/14.618 | Image (2020-04-19.941) taken 7.47 days after LRN discovery. SN shown by white cross hairs. Magnitude ? (v. faint) A LRN is is a stellar explosion thought to be caused by the merging of two stars. The luminosity of the explosion occurring in luminous red novae is between that of a supernova (which is brighter) and a nova (dimmer). The visible light lasts for weeks or months, and is distinctively red in colour, becoming dimmer and redder over time. (Wikipedia)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2020-04-19 22:35 UT (#770052-56) 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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NGC 6106 - Spiral Galaxy with Type Ib Supernova 2024ahv

NGC 6106 with SN 2024ahv (Hercules) SN 2024ahv (Type: Ib) discovered 2024-01-16.852 UT by Hidehiko Okoshi Alias: PS24vc, ATLAS24baw Discovery magnitude 16.2 (Clear Filter)  ( TNS 2024ahv)

NGC 6106 - Spiral Galaxy

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 01:52 UT (#1311165-69) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6106 with SN 2024ahv - 2025-04-07 (T+446.2d) Image below (2025-04-07.071) was taken 446.2 days after discovery of 2024ahv Position of earlier transient (faded & no longer visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.3 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 01:52 UT (#1311165-69) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 6106 with SN 2024ahv - Earlier Image, 2024-02-14 (T+28.3d) Image below (2024-02-14.169) was taken 28.3 days after discovery of 2024ahv Position of reported transient (distinct) is shown by white cross-hairs Measured Magnitude +14.79 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-02-14 04:11 UT (#1185234-37) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024ahv (in NGC 6106) on Supernova 2024 Page >>

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UGCA 277 - Irregular Galaxy (PGC 39395)

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UGC 3355 - Spiral Galaxy with Type Ia Supernova 2025dbx

UGC 3355 with SN 2025dbx (Auriga) SN 2025dbx (Type: Ia) discovered 2025-03-01.298 UT by ATLAS using ATLAS Haleakala Telescope Alias: ATLAS25cgo Discovery magnitude 18.78 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 19.35  ( TNS 2025dbx)

UGC 3355 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 21:20 UT (#1311012-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 3355 with SN 2025dbx - 2025-04-06 (T+36.6d) Image below (2025-04-06.883) was taken 36.6 days after discovery of 2025dbx Position of reported supernova (very faint ) is shown by white cross-hairs Estimated Magnitude +18.5 (Clear Filter)

Annotated CCD Image (175% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-06 21:20 UT (#1311012-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025dbx (in UGC 3355) 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 - Spiral Galaxy with SN 2025gvs (T+1.6d)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 02:36 UT (#1311179-83) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10058 with SN 2025gvs - 2025-04-07 (T+1.6d) Image below (2025-04-07.102) was taken 1.6 days after discovery of 2025gvs Position of reported supernova (distinct, brightening) is shown by white cross-hairs Measured Magnitude +16.59 (Clear Filter)

Annotated CCD Image (175% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-04-07 02:36 UT (#1311179-83) 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 10913 - Spiral Galaxy with Transient AT 2025hy

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