David's Astronomy Pages Images - Session 1297 (2025-01-18)

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Session Notes

29P/Schwassmann-Wachmann - Comet 43P/Wolf-Harrington - Comet   AT 2023jbu - Transient  (non-detection) AT 2023ude - CV Type Transient  (non-detection) AT 2023vqz - Type QSO Transient AT 2023wfq - Type YSO Transient AT 2023xfi - Transient  (non-detection) AT 2024jfs - Transient  (non-detection)   Variable Stars (photometric monitoring) - RX And, SY Cnc, T CrB, CI Cyg, U Gem, RZ LMi, BL Lac, RR Leo, CN Ori, FU Ori, GW Ori, NV Ori, GK Per, ER UMa   Nearby Stars (astrometric monitoring) - None

- All-Night Session (13.5 hr) - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 0°C (min), climbing sharply later to 3.5°C - CCD Temperature:  -15°/-20°/-25°C - Notes from 2025-01-18 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2025-01-18 (passing through Leo) Sun Distance 6.26 AU Earth Distance 5.40 AU (807.6 million km)		29P/Schwassmann-Wachmann - 2025-01-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -13.0 arcsec/hr, Dec 2.4 arcsec/hr) Measured M2 Magnitude +14.17 (Clear Filter)
Annotated CCD Image (50% size, square root scale) 3 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-01-18 22:42 UT (#1297128-30) 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) 9 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-01-18 22:47 UT (#1297128-36) 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 2025 Page  >>

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43P/Wolf-Harrington  - Comet

43P/Wolf-Harrington - 2025-01-18 (passing through Aries) Sun Distance 2.81 AU Earth Distance 2.58 AU (385.6 million km)		43P/Wolf-Harrington - 2025-01-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 28.8 arcsec/hr, Dec 2.5 arcsec/hr) Measured M2 Magnitude +16.95 (Clear Filter)
Annotated CCD Image (50% size, square root scale) 5 x 120s exposure (average combine), 3x3 binning, Clear Filter 2025-01-18 19:13 UT (#1297038-42) 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 2025 Page  >>

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AT 2023jbu  - Transient  (non-detection)

AT 2023jbu (Lyra) AT 2023jbu (Type: unk) discovered 2023-05-21.368 UT by ZTF Alias: ZTF23aaladoy Discovery Magnitude 15.56 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 21.06 (r-ZTF Filter) ( TNS 2023jbu )

AT 2023jbu - 2025-01-19 (T+608.9d) Image below (2025-01-19.271) was taken 608.9 days after discovery of 2023jbu Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude + (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-19 06:36 UT (#1297355-57) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023jbu on Transients 2023 Page  >>

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AT 2023ude  - CV Type Transient  (non-detection)

AT 2023ude (Ophiuchus) AT 2023ude (Type: CV) discovered 2023-10-05.587 UT by XOSS Alias: KATS23T002, TCP J17353485+0646368 Discovery Magnitude 16.12 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) UG candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats23t002.html ( TNS 2023ude )

AT 2023ude - 2025-01-19 (T+471.6d) Image below (2025-01-19.234) was taken 471.6 days after discovery of 2023ude Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +15.3 (Clear Filter) Poor quality image (poor sky transparency, single frame)

Annotated CCD Image (100% size, linear scale, cropped) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-01-19 05:37 UT (#1297329) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023ude on Transients 2023 Page  >>

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AT 2023vqz  - Type QSO Transient

AT 2023vqz (Auriga) Alias: In WISEA J064410.86+354644.6 AT 2023vqz (Type: QSO) discovered 2023-10-16.370 UT by Gaia Alias: Gaia23cxv Discovery Magnitude 15.39 (G-Gaia Filter) vs Prior Non-Detection Limiting Magnitude 21.5 (G-Gaia Filter) Gaia Alerting Magnitude 15.39 vs Historic Magnitude 16.31 +/- 0.25 SD Brightening in known QSO ( TNS 2023vqz | Gaia23cxv )

AT 2023vqz - 2025-01-19 (T+460.6d) Image below (2025-01-19.001) was taken 460.6 days after discovery of 2023vqz Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +15.05 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-19 00:07 UT (#1297173-75) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023vqz on Transients 2023 Page  >>

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AT 2023wfq  - Type YSO Transient

AT 2023wfq (Orion) AT 2023wfq (Type: YSO) discovered 2023-10-26.387 UT by Gaia Alias: Gaia23czv Discovery Magnitude 14.59 (G-Gaia Filter) vs Prior Non-Detection Limiting Magnitude 21.5 (G-Gaia Filter) Gaia Alerting Magnitude 14.59 vs Historic Magnitude 15.62 +/- 0.34 SD Brightening in known YSO ( TNS 2023wfq | Gaia23czv )

AT 2023wfq - 2025-01-18 (T+450.6d) Image below (2025-01-18.982) was taken 450.6 days after discovery of 2023wfq Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +15.45 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-18 23:43 UT (#1297164-68) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023wfq on Transients 2023 Page  >>

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AT 2023xfi  - Transient  (non-detection)

AT 2023xfi (Ophiuchus) AT 2023xfi (Type: unk) discovered 2023-11-03.135 UT by ZTF Alias: ZTF23aboeemv, Gaia23ddv Discovery Magnitude 16.13 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 17.81 (r-ZTF Filter) Gaia Alerting Magnitude 18.07 Apparently hostless transient ( TNS 2023xfi | Gaia23ddv )

AT 2023xfi - 2025-01-19 (T+443.1d) Image below (2025-01-19.240) was taken 443.1 days after discovery of 2023xfi Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.6 (Clear Filter) Poor quality image (poor sky transparency)

Annotated CCD Image (100% size, linear scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-19 05:54 UT (#1297334-38) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023xfi on Transients 2023 Page  >>

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AT 2024jfs  - Transient  (non-detection)

AT 2024jfs (Gemini) AT 2024jfs (Type: unk) discovered 2024-05-22.247 UT by ATLAS Alias: ATLAS24hpo Discovery Magnitude 16.711 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 18.71 (orange-ATLAS Filter) ( TNS 2024jfs )

AT 2024jfs - 2025-01-18 (T+241.7d) Image below (2025-01-18.925) was taken 241.7 days after discovery of 2024jfs Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-01-18 22:19 UT (#1297120-23) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024jfs on Transients 2024 Page  >>

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