David's Astronomy Pages Images - Session 1397 (2026-02-28)

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Image (S1398)

Objects	Session Notes
29P/Schwassmann-Wachmann - Comet 43P/Wolf-Harrington - Comet  (non-detection)   AT 2025ahek - Type CV? Transient   SN 2025aedz - Type II Supernova   UGC 117 - Spiral Galaxy with Type II Supernova 2026cbh UGC 3028 - Spiral Galaxy with Type Ia Supernova 2026gm   Variable Stars (photometric monitoring) - T CrB, RZ LMi, BL Lac, FO Ori, GK Per   Nearby Stars (astrometric monitoring) - None	- Attempted All-Night Session (6.1 hr) ended early due to cloud - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 2.5°C (min) - CCD Temperature:  -20°C - Notes from 2026-02-28 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2026-03-01 (passing through Leo) Sun Distance 6.31 AU Earth Distance 5.34 AU (799.5 million km)		29P/Schwassmann-Wachmann - 2026-03-01 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -16.0 arcsec/hr, Dec 4.6 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 6 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-03-01 00:22 UT (#1397062-68) 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 Comet_29P_Schwassmann-Wachmann on Comets 2026 Page  >>

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43P/Wolf-Harrington  - Comet  (non-detection)

43P/Wolf-Harrington - 2026-03-01 (passing through Crater) Sun Distance 2.85 AU Earth Distance 1.88 AU (281.9 million km) Poor quality image (bright uneven oonlit sky background)		43P/Wolf-Harrington - 2026-03-01 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -25.0 arcsec/hr, Dec 11.2 arcsec/hr) Expected position of comet (not visibke) shown by white circle
Annotated CCD Image (50% size, square root scale) 3 x 120s exposure (average combine), 3x3 binning, Clear Filter 2026-03-01 00:53 UT (#1397082-84) 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 Comet_43P_Wolf-Harrington on Comets 2026 Page  >>

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AT 2025ahek  - Type CV? Transient

AT 2025ahek (Cygnus) AT 2025ahek (Type: CV?) discovered 2025-12-15.502 UT by Ziyang Mai Discovery Magnitude 16.78 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Possible CV in Cyg. ( TNS 2025ahek )

AT 2025ahek - 2026-02-28 (T+75.5d) Image below (2026-02-28.995) was taken 75.5 days after discovery of 2025ahek Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.6 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-03-01 00:02 UT (#1397055-59) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025ahek on Transients 2025 Page  >>

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SN 2025aedz  - Type II Supernova

SN 2025aedz (Camelopardalis) SN 2025aedz (Type: II) discovered 2025-11-18.806 UT by Taiga Sasaoka Alias: ZTF25acegczg, ATLAS25pbz, GOTO25kss Discovery Magnitude 17.19 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 17.41 (Clear- Filter) Observation with the Tomo-e Gozen camera on the 1.05 Kiso Schmidt telescope. No filter used (the peak wavelength is 500nm and the wavelength range is 350-900nm). ( TNS 2025aedz )

SN 2025aedz - 2026-02-28 (T+102.2d) Image below (2026-02-28.983) was taken 102.2 days after discovery of 2025aedz Position of earlier supernova (very faint) is shown by white cross-hairs Limiting Magnitude +18.6 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-28 23:41 UT (#1397050-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2025aedz - Earlier Image, 2025-11-27 (T+9.1d) Image below (2025-11-27.934) was taken 9.1 days after discovery of 2025aedz Position of reported supernova (distinct) is shown by white cross-hairs Measured Magnitude +16.31 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-27 22:34 UT (#1379162-66) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025aedz on Supernovae 2025 Page  >>

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UGC 117  - Spiral Galaxy with Type II Supernova 2026cbh

UGC 117 with SN 2026cbh (Andromeda) SN 2026cbh (Type: II) discovered 2026-02-03.231 UT by ATLAS Alias: ATLAS26bie, ZTF26aaexdrj Discovery Magnitude 17.429 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 18.28 (orange-ATLAS Filter) ( TNS 2026cbh )

UGC 117 - Spiral Galaxy Alias: PGC 869 (catalog mag 15.3)

Annotated CCD Image (50% size, square root scale) 180s exposure (single frame), 3x3 binning, Clear Filter 2026-02-28 19:36 UT (#1397012) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 117 with SN 2026cbh - 2026-02-28 (T+25.6d) Image below (2026-02-28.817) was taken 25.6 days after discovery of 2026cbh Position of earlier supernova (faint) is shown by white cross-hairs Measured Magnitude +16.28 (Clear Filter) Poor quality image (single frame)

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2026-02-28 19:36 UT (#1397012) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026cbh (in UGC 117) on Supernovae 2026 Page  >>

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UGC 3028  - Spiral Galaxy with Type Ia Supernova 2026gm

UGC 3028 with SN 2026gm (Perseus) SN 2026gm (Type: Ia) discovered 2026-01-08.798 UT by XOSS Alias: PSP26B, GOTO26cp, ATLAS26aff, MASTER OT J042437.37+335144.2 Discovery Magnitude 18.08 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) SN candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/psp26b.html ( TNS 2026gm )

UGC 3028 with SN 2026gm - 2026-02-28 (T+51.2d) Image below (2026-02-28.964) was taken 51.2 days after discovery of 2026gm Position of earlier supernova (very faint) is shown by white cross-hairs Estimated Magnitude +18.4 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-28 23:17 UT (#1397041-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026gm (in UGC 3028) on Supernovae 2026 Page  >>

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