David's Astronomy Pages Images - Session 1431 (2026-05-20)

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Session Notes

29P/Schwassmann-Wachmann - Comet   AT 2025lc - CV Type Transient   IC 5191 - Spiral Galaxy with Type Ia Supernova 2026myp   NGC 3437 - Spiral Galaxy with Type Ic Supernova 2026kie NGC 3689 - Spiral Galaxy with Type Ib Supernova 2026gwx NGC 5907 - Spiral Galaxy with Type II Supernova 2026kid   - AT2026jyw attempt failed (due to cloud)   Variable Stars (photometric monitoring) - T CrB, RZ LMi, BL Lac   Nearby Stars (astrometric monitoring) - None

- Attempted All-Night Session (3.3 hr) - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 5°C (min) - CCD Temperature:  -15°C - Notes from 2026-05-20 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2026-05-20 (passing through Leo) Sun Distance 6.32 AU Earth Distance 5.95 AU (890.1 million km)		29P/Schwassmann-Wachmann - 2026-05-20 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 2.5 arcsec/hr, Dec 0.5 arcsec/hr) Measured M2 Magnitude +16.48 (Clear Filter)
Annotated CCD Image (50% size, square root scale) 7 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-05-20 23:08 UT (#1431020-26) 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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AT 2025lc  - CV Type Transient

AT 2025lc (Cygnus) AT 2025lc (Type: CV) discovered 2025-01-10.553 UT by Gaia Alias: Gaia25add Discovery Magnitude 14.48 (G-Gaia Filter) vs Prior Non-Detection Limiting Magnitude 21.5 (G-Gaia Filter) Outburst in candidate CV ( TNS 2025lc | Gaia25add )

AT 2025lc - 2026-05-20 (T+495.4d) Image below (2026-05-20.989) was taken 495.4 days after discovery of 2025lc Position of earlier transient (faint) is shown by white cross-hairs Estimated Magnitude +15.6 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-05-20 23:47 UT (#1431036-40) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025lc on Transients 2025 Page  >>

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IC 5191  - Spiral Galaxy with Type Ia Supernova 2026myp

IC 5191 with SN 2026myp (Lacerta) SN 2026myp (Type: Ia) discovered 2026-05-17.575 UT by ATLAS Alias: ATLAS26fxq Discovery Magnitude 17.878 (cyan-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 16.46 (orange-ATLAS Filter) ( TNS 2026myp )

IC 5191 with adjacent galaxies IC 5191 (alias PGC 68399, catalog mag+14.9) NGC 7242 (catalog mag +12.9), NGC 7240 (catalog mag +14.3) IC 1441 (catalog mag +14.6), PGC 68436 (catalog mag +15.4)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-05-21 00:15 UT (#1431048-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

IC 5191 with SN 2026myp - 2026-05-21 (T+3.4d) Image below (2026-05-21.004) was taken 3.4 days after discovery of 2026myp Position of earlier supernova (faint) is shown by white cross-hairs Estimated Magnitude +16.7 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-05-21 00:15 UT (#1431048-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026myp (in IC 5191) on Supernovae 2026 Page  >>

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NGC 3437  - Spiral Galaxy with Type Ic Supernova 2026kie

NGC 3437 with SN 2026kie (Leo) SN 2026kie (Type: Ic) discovered 2026-04-22.314 UT by ATLAS Alias: ATLAS26epm, ZTF26aatzrft Discovery Magnitude 18.086 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 19.49 (orange-ATLAS Filter) ( TNS 2026kie )

NGC 3437 with SN 2026kie - 2026-05-20 (T+28.6d) Image below (2026-05-20.944) was taken 28.6 days after discovery of 2026kie Position of earlier supernova (faint) is shown by white cross-hairs Estimated Magnitude +15.3 (Clear Filter) Poor quality image (due to cloud)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-05-20 22:49 UT (#1431012-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026kie (in NGC 3437) 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 - 2026-05-20 (T+61.7d) Image below (2026-05-20.974) was taken 61.7 days after discovery of 2026gwx Position of earlier supernova (faint) is shown by white cross-hairs Estimated Magnitude +16.2 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-05-20 23:28 UT (#1431030-33) 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 5907  - Spiral Galaxy with Type II Supernova 2026kid

NGC 5907 with SN 2026kid (Draco) SN 2026kid (Type: II) discovered 2026-04-22.600 UT by Yasuo Sano Alias: ATLAS26equ, ZTF26aatswhm Discovery Magnitude 16.62 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 19 (Clear- Filter) SCT 0.36-m F/11 reflector + FLI ML1001E CCD, Nayoro Hokkaido Japan ( TNS 2026kid )

NGC 5907 with SN 2026kid - 2026-05-21 (T+28.4d) Image below (2026-05-21.019) was taken 28.4 days after discovery of 2026kid Position of earlier supernova (distinct) is shown by white cross-hairs Estimated Magnitude +15.1 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-05-21 00:35 UT (#1431055-59) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026kid (in NGC 5907) on Supernovae 2026 Page  >>

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