David's Astronomy Pages Images - Session 1392 (2026-01-17)

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Image (S1392)

Objects	Session Notes
29P/Schwassmann-Wachmann - Comet   UGC 5381 - Spiral Galaxy with Type II Supernova 2025ahep UGC 5607 - Spiral Galaxy with Type Ia Supernova 2026kc   Variable Stars (photometric monitoring) - None   Nearby Stars (astrometric monitoring) - None	- Post-midnight session (1.2 hr), ended early due to cloud and software problem. - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 5°C (min) - CCD Temperature:  -20°C - Notes from 2026-01-17 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2026-01-18 (passing through Leo) Sun Distance 6.31 AU Earth Distance 5.73 AU (857.0 million km)		29P/Schwassmann-Wachmann - 2026-01-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -5.1 arcsec/hr, Dec -1.6 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 4 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-01-18 04:13 UT (#1392020-28) 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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UGC 5381  - Spiral Galaxy with Type II Supernova 2025ahep

UGC 5381 with SN 2025ahep (Leo) SN 2025ahep (Type: II) discovered 2025-12-17.443 UT by ATLAS Alias: ZTF25acinfdh Discovery Magnitude 17.506 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 21.0114 (g-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). ( TNS 2025ahep )

UGC 5381 with SN 2025ahep - 2026-01-18 (T+31.7d) Image below (2026-01-18.139) was taken 31.7 days after discovery of 2025ahep Position of earlier supernova (faint) is shown by white cross-hairs Estimated Magnitude +17.5 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-01-18 03:28 UT (#1392006-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025ahep (in UGC 5381) on Supernovae 2025 Page  >>

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UGC 5607  - Spiral Galaxy with Type Ia Supernova 2026kc

UGC 5607 with SN 2026kc (Sextans) SN 2026kc (Type: Ia) discovered 2026-01-10.087 UT by ATLAS Alias: ATLAS26aej, GOTO26dc, ZTF26aaaehuj Discovery Magnitude 18.78 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.5 (L-GOTO Filter) ( TNS 2026kc )

UGC 5607 with SN 2026kc - 2026-01-18 (T+8.1d) Image below (2026-01-18.154) was taken 8.1 days after discovery of 2026kc

Annotated CCD Image (50% size, square root scale) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-01-18 03:45 UT (#1392013-14) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5607 with SN 2026kc - 2026-01-18 (T+8.1d) Image below (2026-01-18.154) was taken 8.1 days after discovery of 2026kc Position of earlier supernova (faint) is shown by white cross-hairs Measured Magnitude +15.68 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-01-18 03:45 UT (#1392013-14) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026kc (in UGC 5607) on Supernovae 2026 Page  >>

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