David's Astronomy Pages Images - Session 1370 (2025-10-27)

Images (S1369)

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Image (S1371)

Objects	Session Notes
C/2025 A6 (Lemmon) - Comet     Nova Ser 2025 (V691 Ser)     Variable Stars (photometric monitoring) - None     Nearby Stars (astrometric monitoring) - None	- Short Evening Session (0.9 hr), start delayed by low star count and ended early by cloud - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:1.5°C (min) - CCD Temperature:  -20°/-25°C - Notes from 2025-10-27 >>           -

Observing Result

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C/2025 A6 (Lemmon) - Comet

C/2025 A6 (Lemmon) - 2025-10-27 (passing through Serpens) Sun Distance 0.60 AU (approaching) Earth Distance 0.67 AU (100.4 million km)

Cam2 Reference Image

Annotated CMOS Image (16% size) (10s exposure, 1x1 binning) 2025-10-27 18:51 UT TS 80mm APO, ZWO ASI178MC

C/2025 A6 (Lemmon) - 2025-10-27 (passing through Serpens) Sun Distance 0.60 AU (approaching) Earth Distance 0.67 AU (100.4 million km)		C/2025 A6 (Lemmon) - 2025-10-27 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 364.5 arcsec/hr, Dec -382.2 arcsec/hr)
Annotated CCD Image (50% size, log scale) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-10-27 18:53 UT (#1370008) 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) 9 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-10-27 18:58 UT (#1370008-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
C/2025 A6 (Lemmon) - 2025-10-27		C/2025 A6 (Lemmon) - 2025-10-27 Detail
False Colour CCD Image (50% size, log scale) 9 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-10-27 18:58 UT (#1370008-16) 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 - 2025-10-27 (T+101.9d) Image below (2025-10-27.800) was taken 101.9 days after discovery of Nova Ser 2025 Position of nova (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +15.6 to +16.1 (Clear Filter) vs +15.46 Measured Magnitude in last session (S1368, T+73.0d) Poor quality image (cloud / poor sky transparency)

Annotated CCD Image (100% size, linear scale, cropped) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-10-27 19:14 UT (#1370024-26) 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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