David's Astronomy Pages Images - Session 1383 (2025-12-08)

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Session Notes

C/2022 N2 (PANSTARRS) - Comet C/2025 R2 (SWAN) - Comet   AT 2023ctk - Type YSO Transient AT 2025adhw - Type Afterglow Transient   M31N 2025-10a? - Extragalactic Nova in M31 SN 2025aedz - Type II Supernova   UGC 2885 - Spiral Galaxy with Type II Supernova 2025aant UGC 3458 - Spiral Galaxy with Type II Supernova 2025yao   Variable Stars - TV Cas, U Gem, BL Lac   Nearby Stars - DX Cnc (Gliese 1111), Teegarden's Star

- All-Night Session (7.4 hrs) - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 4°C (min) - CCD Temperature:  -20°C - Notes from 2025-12-08 >> - First Session Image page to be created using AstroMain's new 'PageBuilder' tool -

Observing Result

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C/2022 N2 (PANSTARRS) - Comet

C/2022 N2 (PANSTARRS) - 2025-12-08 (passing through Aries) Sun Distance 3.99 AU Earth Distance 3.08 AU (460.2 million km)		C/2022 N2 (PANSTARRS) - 2025-12-08 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -9.6 arcsec/hr, Dec -5.5 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-12-08 23:19 UT (#1383052-56) 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
Annotated negative CCD Image (50% size, square root scale) Image details as above		Annotated negative CCD Image (125% size, square root scale, cropped) Image details as above left
Images of C/2022 N2 (PANSTARRS) on Comets 2025 Page  >>

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C/2025 R2 (SWAN) - Comet

C/2022 N2 (PANSTARRS) - 2025-09-02 (passing through Aries) Sun Distance 3.84 AU (receeding) Earth Distance 3.46 AU (518.0 million km)		C/2022 N2 (PANSTARRS) - 2025-09-02 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 18.58 arcsec/hr, Dec 8.27 arcsec/hr)
Annotated CCD Image (50% size, square root scale)		Annotated CCD Image (100% size, square root scale, cropped) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-02 23:26 UT (#1356015-21)
Images of C2025_R2_SWAN on Comets 2025 Page  >>

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AT 2023ctk - Type YSO Transient

AT 2023ctk (Orion) AT 2023ctk (Type: YSO) discovered 2023-03-03.857 UT by Gaia Alias: Gaia23azb

Discovery Magnitude 16.30 (G-Gaia Filter)

( TNS 2023ctk | Gaia23azb )

AT 2023ctk - 2025-12-09 (T+1011.2d)

Image below (2025-12-09.031) was taken 1011.2 days after discovery of 2023ctk

Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude +15.47 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-09 00:52 UT (#1383077-81) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023ctk on Transients 2023 Page  >>

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AT 2025adhw - Type Afterglow Transient

AT 2025adhw (Cetus) AT 2025adhw (Type: Afterglow) discovered 2025-11-13.794 UT by MASTER Alias: MASTER OT J031644.26+071022.6, GRB 251113A

Discovery Magnitude 15.60 (Other Filter) vs Prior Non-Detection Limiting Magnitude 19.90 (Other Filter) Bright optical transient (OT) inside GRB 251113A: Fermi GBM error-box

( TNS 2025adhw )

AT 2025adhw - 2025-12-08 (T+25.1d)

Image below (2025-12-08.925) was taken 25.1 days after discovery of 2025adhw

Position of reported transient (very faint) is shown by white cross-hairs Estimate Magnitude +19.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-08 22:21 UT (#1383025-29) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative Image

Annotated negative CCD Image (125% size, linear scale, cropped)

Images of AT 2025adhw on Transients 2025 Page  >>

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M31N 2025-10a? - Extragalactic Nova in M31

M31N 2025-10a? (Andromeda) M31N 2025-10a? (Type: unk) discovered 2025-10-17.480 UT by Koichi Itagaki Alias: TCP J00384865+4046079

Discovery Magnitude 17.8 This object seems to be identical with the red variable Gaia DR3 381143133083759232. "Discovered" iindependently on October 18.8112UT. -- Robert Fidrich, HAA/VSS, Budakeszi, Hungary

M31N 2025-10a? (Andromeda)

M31N 2025-10a? (Type: unk) discovered 2025-10-17.480 UT by Koichi Itagaki Alias: TCP J00384865+4046079

Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude +14.42 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-08 22:44 UT (#1383032-36) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of M31N 2025-10a? (in M31) on Transients 2025 Page  >>

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SN 2025aedz - Type II Supernova

SN 2025aedz (Camelopardalis) SN 2025aedz (Type: II) discovered 2025-11-18.806 UT by Taiga Sasaoka Alias: ZTF25acegczg

Discovery Magnitude 17.19 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 17.41 (Clear Filter)

( TNS 2025aedz )

SN 2025aedz - 2025-12-09 (T+20.3d)

Image below (2025-12-09.078) was taken 20.3 days after discovery of 2025aedz

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +16.51 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-09 02:01 UT (#1383113-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGC 2885 - Spiral Galaxy with Type II Supernova 2025aant

UGC 2885 with SN 2025aant (Perseus) SN 2025aant (Type: II) discovered 2025-10-15.468 UT by ATLAS Alias: ATLAS25msz

Discovery Magnitude 18.42 (cyan-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 20.00 (wide-ATLAS Filter)

( TNS 2025aant )

UGC 2885 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-09 00:34 UT (#1383070-74) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 2885 with SN 2025aant - 2025-12-09 (T+54.5d)

Image below (2025-12-09.017) was taken 54.5 days after discovery of 2025aant

Position of earlier transient (very faint) is shown by white cross-hairs Estimated Magnitude +18.5 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-09 00:34 UT (#1383070-74) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025aant (in UGC 2885 on Supernovae 2025 Page  >>

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UGC 3458 - Spiral Galaxy with Type II Supernova 2025yao

UGC 3458 with SN 2025yao (Camelopardalis) SN 2025yao (Type: II) discovered 2025-09-20.446 UT by ZTF Alias: ZTF25absindv

Discovery Magnitude 18.37 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 20.32 (r-ZTF Filter)

( TNS 2025yao )

UGC 3458 with SN 2025yao - 2025-12-09 (T+79.6d)

Image below (2025-12-09.047) was taken 79.6 days after discovery of 2025yao

Position of earlier transient (very faint) is shown by white cross-hairs Estimated Measured Magnitude +18.1 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-09 01:16 UT (#1383084-88) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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