David's Astronomy Pages Images - Session 1425 (2026-04-22)

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Image (S1426)

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Session Notes

29P/Schwassmann-Wachmann - Comet   AT 2026hur - Type CV? Transient AT 2026iul - CV Type Transient AT 2026jcv - CV Type Transient   IC 4556 - Elliptical Galaxy with Type Ia Supernova 2026fuz   NGC 3689 - Spiral Galaxy with Type Ib Supernova 2026gwx NGC 4205 - Spiral Galaxy with Type Ia Supernova 2026fvx   - Comet 10P Tempel attempt failed (due to bright sky/too few stars)   Variable Stars (photometric monitoring) - T CrB, SS Her, U Her, BL Lac, CY Lyr   Nearby Stars (astrometric monitoring) - None

- Late Night Session (3.4 hr) ended early by cloud - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -0.5°C (min) - CCD Temperature:  -20°/-25°C - Notes from 2026-04-22 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2026-04-22 (passing through Leo) Sun Distance 6.31 AU Earth Distance 5.57 AU (833.7 million km)		29P/Schwassmann-Wachmann - 2026-04-22 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -7.6 arcsec/hr, Dec 4.1 arcsec/hr) Measured M2 Magnitude +14.58 (Clear Filter)
Annotated CCD Image (50% size, square root scale) 2 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-04-22 22:56 UT (#1425006-10) 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) 2 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-04-22 22:56 UT (#1425006-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of Comet_29P_Schwassmann-Wachmann on Comets 2026 Page  >>

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AT 2026hur  - Type CV? Transient

AT 2026hur (Serpens) AT 2026hur (Type: CV?) discovered 2026-03-29.850 UT by XOSS Alias: KATS26F005 Discovery Magnitude 15.81 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats26f005.html ( TNS 2026hur )

AT 2026hur - 2026-04-23 (T+24.2d) Image below (2026-04-23.066) was taken 24.2 days after discovery of 2026hur Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +17.38 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-04-23 01:44 UT (#1425093-97) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026hur on Transients 2026 Page  >>

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AT 2026iul  - CV Type Transient

AT 2026iul (Cygnus) AT 2026iul (Type: CV) discovered 2026-04-07.397 UT by GEOTS Alias: GEOTS-PAPA-SHANKAR-2026-003 Discovery Magnitude 15.7 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter) Discovered in Cyg using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). Group reports a significant brightening of the Gaia DR3 variable star 2033708559892804224 (VSX). Recent observations show an increase in magnitude of >2.3 when compared to the last recorded observation from Golden Ears Observatory on 02 March 2026. ( TNS 2026iul )

AT 2026iul - 2026-04-23 (T+15.6d) Image below (2026-04-23.044) was taken 15.6 days after discovery of 2026iul Position of earlier transient (faint but distinct) is shown by white cross-hairs Measured Magnitude +14.25 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-23 01:07 UT (#1425073-77) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026iul on Transients 2026 Page  >>

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AT 2026jcv  - CV Type Transient

AT 2026jcv (Ophiuchus) AT 2026jcv (Type: CV) discovered 2026-04-09.864 UT by XOSS Alias: KATS26G002 Discovery Magnitude 16.87 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats26g002.html ( TNS 2026jcv )

AT 2026jcv - 2026-04-22 (T+13.1d) Image below (2026-04-22.996) was taken 13.1 days after discovery of 2026jcv Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +18.52 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-22 23:57 UT (#1425030-34) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026jcv on Transients 2026 Page  >>

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IC 4556  - Elliptical Galaxy with Type Ia Supernova 2026fuz

IC 4556 with SN 2026fuz (Serpens) SN 2026fuz (Type: Ia) discovered 2026-03-15.132 UT by GOTO Alias: GOTO26cbv, ZTF26aalhcqv, ATLAS26dnn, WFST260322dwqzb Discovery Magnitude 19.49 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.9 (L-GOTO Filter) ( TNS 2026fuz )

IC 4556 with SN 2026fuz - 2026-04-23 (T+38.9d) Image below (2026-04-23.004) was taken 38.9 days after discovery of 2026fuz Position of earlier supernova (faint) is shown by white cross-hairs Measured Magnitude +18.46 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-04-23 00:15 UT (#1425037-41) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026fuz (in IC 4556) on Supernovae 2026 Page  >>

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NGC 3689  - Spiral Galaxy with Type Ib Supernova 2026gwx

NGC 3689 with SN 2026gwx (Leo) SN 2026gwx (Type: Ib) discovered 2026-03-20.236 UT by ATLAS Alias: ZTF26aaodgsa, GOTO26cmj, ATLAS26dmo, WFST260320nhhv, PS26ash Discovery Magnitude 20.8896 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.921 (g-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). ( TNS 2026gwx )

NGC 3689 with SN 2026gwx - 2026-04-22 (T+33.7d) Image below (2026-04-22.970) was taken 33.7 days after discovery of 2026gwx Position of earlier supernova (faint) is shown by white cross-hairs Estimated Magnitude +15.9 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-04-22 23:20 UT (#1425018-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026gwx (in NGC 3689) on Supernovae 2026 Page  >>

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NGC 4205  - Spiral Galaxy with Type Ia Supernova 2026fvx

NGC 4205 with SN 2026fvx (Draco) SN 2026fvx (Type: Ia) discovered 2026-03-17.986 UT by LAST Alias: ZTF26aamqluf, ATLAS26dgt Discovery Magnitude 19.46 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 19.97 (Clear- Filter) ( TNS 2026fvx )

NGC 4205 with SN 2026fvx - 2026-04-22 (T+36.0d) Image below (2026-04-22.981) was taken 36.0 days after discovery of 2026fvx Position of earlier supernova (distinct) is shown by white cross-hairs Measured Magnitude +13.20 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-04-22 23:42 UT (#1425023-27) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026fvx (in NGC 4205) on Supernovae 2026 Page  >>

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