David's Astronomy Pages Images - Session 1295 (2025-01-15)

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Image (S1296)

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Session Notes

AT 2025il - CV Type Transient AT 2025la - Transient AT 2025lc - CV Type Transient   NGC 1275 - Spiral Galaxy with Type IIP Supernova 2024xav  (non-detection)   UGC 604 - Spiral Galaxy with Type II Supernova 2024advj UGC 1325 - Elliptical Galaxy with Type Ia Supernova 2024aedt   Variable Stars (photometric monitoring) - U And, SU Tau, KIC 8462852 (Tabby's Star)   Nearby Stars (astrometric monitoring) - 61 Cyg

- Attempted all-night session (13 hr), but interrupted by cloud/ session suspension for nearly 10 hr - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 6°C (min) - CCD Temperature:  -15°/-20°C - Notes from 2025-01-15 >> - -

Observing Result

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AT 2025il  - CV Type Transient

AT 2025il (Pegasus) AT 2025il (Type: CV) discovered 2025-01-07.343 UT by Gaia Alias: Gaia25abx Discovery Magnitude 11.34 (G-Gaia Filter) vs Prior Non-Detection Limiting Magnitude 21.5 (G-Gaia Filter) Gaia Alerting Magnitude 11.34 vs Historic Magnitude 12.40 +/- 0.41 SD Outburst in CV RU Peg ( TNS 2025il | Gaia25abx )

AT 2025il - 2025-01-15 (T+8.5d) Image below (2025-01-15.818) was taken 8.5 days after discovery of 2025il Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude ? (Clear Filter) Poor quality image (star trailing). Unable to successfully link.

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 19:41 UT (#1295036-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025il on Transients 2025 Page  >>

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AT 2025la  - Transient

AT 2025la (Cygnus) AT 2025la (Type: unk) discovered 2025-01-11.109 UT by Gaia Alias: Gaia25acy Discovery Magnitude 16.29 (G-Gaia Filter) vs Prior Non-Detection Limiting Magnitude 21.5 (G-Gaia Filter) Gaia Alerting Magnitude 16.29 Candidate SN near PanSTARRS galaxy ( TNS 2025la | Gaia25acy )

AT 2025la - 2025-01-15 (T+4.7d) Image below (2025-01-15.806) was taken 4.7 days after discovery of 2025la Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +16.51 (Clear Filter)

Annotated CCD Image (150% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 19:27 UT (#1295030-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025la on Transients 2025 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) Gaia Alerting Magnitude 14.48 vs Historic Magnitude 15.89 +/- 0.61 SD Outburst in candidate CV ( TNS 2025lc | Gaia25add )

AT 2025lc - 2025-01-15 (T+5.2d) Image below (2025-01-15.794) was taken 5.2 days after discovery of 2025lc Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +14.30 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 19:07 UT (#1295022-26) 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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NGC 1275  - Spiral Galaxy with Type IIP Supernova 2024xav  (non-detection)

NGC 1275 with SN 2024xav (Perseus) SN 2024xav (Type: IIP) discovered 2024-09-30.036 UT by GOTO Alias: GOTO24gor, ATLAS24otv, ZTF24abljlku Discovery Magnitude 18.63 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.2 (L-GOTO Filter) ( TNS 2024xav )

NGC 1275 with SN 2024xav - 2025-01-15 (T+107.8d) Image below (2025-01-15.859) was taken 107.8 days after discovery of 2024xav Position of earlier supernova (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.5 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 20:44 UT (#1295072-75) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024xav (in NGC 1275) on Supernovae 2024 Page  >>

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UGC 604  - Spiral Galaxy with Type II Supernova 2024advj

UGC 604 with SN 2024advj (Andromeda) SN 2024advj (Type: II) discovered 2024-12-11.191 UT by ATLAS Alias: ATLAS24riq, ZTF24abxpkhb, Gaia24dqw Discovery Magnitude 17.8751 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.2015 (g-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). Gaia Alerting Magnitude 16.63 Confirmed SN II ( TNS 2024advj | Gaia24dqw )

UGC 604 with SN 2024advj - 2025-01-15 (T+35.6d) Image below (2025-01-15.831) was taken 35.6 days after discovery of 2024advj Position of earlier supernova (faint) is shown by white cross-hairs Measured Magnitude +16.38 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 20:05 UT (#1295052-56) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024advj (in UGC 604) on Supernovae 2024 Page  >>

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UGC 1325  - Elliptical Galaxy with Type Ia Supernova 2024aedt

UGC 1325 with SN 2024aedt (Pisces) SN 2024aedt (Type: Ia) discovered 2024-12-16.375 UT by ATLAS Alias: ATLAS24rks, ZTF24abxzhim Discovery Magnitude 18.553 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 18.51 (orange-ATLAS Filter) ( TNS 2024aedt )

UGC 1325 with SN 2024aedt - 2025-01-15 (T+30.4d) Image below (2025-01-15.776) was taken 30.4 days after discovery of 2024aedt Position of earlier supernova (faint) is shown by white cross-hairs Measured Magnitude +17.31 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-15 18:47 UT (#1295014-18) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024aedt (in UGC 1325) on Supernovae 2024 Page  >>

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