David's Astronomy Pages Images - Session 1364 (2025-09-17)

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Session Notes

C/2022 N2 (PANSTARRS) - Comet C/2025 A6 (Lemmon) - Comet     Nova Ser 2025 (V691 Ser)     AT 2022vdr - CV Type Transient AT 2024sje - Type YSO Transient  (near B33) AT 2025xdz - Type CV? Transient  (non-detection)     LEDA 213320 - Galaxy with Type Ia Supernova 2025tji     M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe     PGC 17707 - Spiral Galaxy UGC 1814 - Spiral Galaxy with Type II Supernova 2025oas       - LEDA 1104425 w/SN2025nou and NGC 7753 w/SN 2025kyg attempts failed (due to cloud), LEDA 3092696 w/AT2025nzh attempt failed (due to unexplained glitch is exposure/filter selection)     Variable Stars (photometric monitoring) - RX And, T CrB, CI Cyg, SS Cyg, BL Lac, GK Per     Nearby Stars (astrometric monitoring) - None

- Attempted all-night session (6.3hr), but interrupted by cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 12.5°C (min). - CCD Temperature:  -10°C - Notes from 2025-09-17 >>           -

Observing Result

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C/2022 N2 (PANSTARRS) - Comet

C/2022 N2 (PANSTARRS) - 2025-09-18 (passing through Taurus) Sun Distance 3.85 AU (receeding) Earth Distance 3.28 AU (491.0 million km)		C/2022 N2 (PANSTARRS) - 2025-09-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 9.32 arcsec/hr, Dec 6.01 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 01:59 UT (#1364091-97) 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 C/2022 N2 (PANSTARRS) on Comets 2025 Page >>

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C/2025 A6 (Lemmon) - Comet

C/2025 A6 (Lemmon) - 2025-09-18 (passing through Lynx) Sun Distance 1.21 AU (approaching) Earth Distance 1.48 AU (221.3 million km)		C/2025 A6 (Lemmon) - 2025-09-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 117.58 arcsec/hr, Dec 41.86 arcsec/hr)
Annotated CCD Image (50% size, log scale) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 03:59 UT (#1364142-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, log scale, cropped) 15 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 04:07 UT (#1364142-56) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
C/2025 A6 (Lemmon) - 2025-09-18		C/2025 A6 (Lemmon) - 2025-09-18 Detail
False Colour CCD Image (50% size, log scale) 15 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 04:07 UT (#1364142-56) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		False Colour  CCD Image (100% size, log scale, cropped) Image details as left
Images of C/2025 A6 (Lemmon) on Comets 2025 Page >>

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Nova Ser 2025 (V691 Ser)

Nova Ser 2025  (Serpens) Nova Ser 2025 discovered 2025-07-17.908 UT by New Milky Way Survey (TCP J18385851-0351482 - discovered 2025-07-17.909 UT by ZTF Alias: ZTF25abbsdyb, N Ser 2025, V691 Ser Discovery Magnitude 11.9

Nova Ser 2025 - 2025-09-17 (T+62.0d) Image below (2025-09-17.947) was taken 62.0 days after discovery of Nova Ser 2025 Position of nova (fading) is shown by white cross-hairs Measured Magnitude +14.80 (Clear Filter) Poor quality image (single frame, not centred, poor sky transpareny due to cloud)

Annotated CCD Image (100% size, linear scale, cropped) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-09-17 22:44 UT (#1364027) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova Ser 2025 - Earlier Image, 2025-08-09 (T+23.1d) Image below (2025-08-09.997) was taken 23.1 days after discovery Position of nova (bright) is shown by white cross-hairs Measured Magnitude +12.93 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-10 00:04 UT (#1346013-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova Ser 2025 on Novae 2025 Page >>

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AT 2022vdr - CV Type Transient

AT 2022vdr (Orion) AT 2022vdr (Type: CV) discovered 2022-09-20.378 UT by MASTER Alias: MASTER OT J052749.27+064639.1 Discovery Mag 14.8 (Clear Filter)  ( TNS 2022vdr )

AT 2022vdr - 2025-09-18 (T+1093.7d) Image below (2025-09-18.125) was taken 1093.7 days after discovery of 2022vdr Position of earlier transient (fading) is shown by white cross-hairs Measured magnitude +15.47

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 03:03 UT (#1364121-25) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022vdr - Earlier Image 2025-04-03 (T+926.5d) Image below (2025-04-03.858) was taken 926.5 days after discovery of 2022vdr Position of reported transient (distinct) is shown by white cross-hairs Measured magnitude +13.41

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-04-03 20:38 UT (#1310007-11) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022vdr on Transients 2022 Page >>

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AT 2024sje - Type YSO Transient  (near B33)

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AT 2025xdz - Type CV? Transient  (non-detection)

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LEDA 213320 - Galaxy with Type Ia Supernova 2025tji

LEDA 213320 with SN 2025tji (Taurus) SN 2025tji (Type: Ia) discovered 2025-08-08.220 UT by GOTO Alias: GOTO25fsc Discovery magnitude 16.75 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.0  ( TNS 2025tji)

LEDA 213320 with SN 2025tji - 2025-09-18 (T+40.9d) Image below (2025-09-18.150) was taken 40.9 days after discovery of 2025tji Position of reported supernova (not separately distinguishable) is shown by white cross-hairs Measured Magnitude +14.51 SN+Nucleus (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 03:44 UT (#1364135-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025tji (in LEDA 213320) on Supernova 2025 Page >>

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M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe

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PGC 17707 - Spiral Galaxy

PGC 17707 (Taurus)

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 03:44 UT (#1364135-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGC 1814 - Spiral Galaxy with Type II Supernova 2025oas

UGC 1814 with SN 2025oas (Aries) SN 2025oas (Type: II) discovered 2025-06-19.472 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF25aavyqag, GOTO25elj, ATLAS25gub, PS25epm Discovery Magnitude 16.75 (r-ZTF Filter)  ( TNS 2025oas )

UGC 1814 with SN 2025oas - 2025-09-18 (T+90.6d) Image below (2025-09-18.094) was taken 90.6 days after discovery of 2025oas Position of earlier supernova (no longer visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.1 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-18 02:22 UT (#1364108-11) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025oas (in UGC 1814) on Supernova 2025 Page >>

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