David's Astronomy Pages Images - Session 1361 (2025-09-11)

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Session Notes

C/2023 A3 (Tsuchinshan-ATLAS) - Comet     KIC 8462852 - Variable Star (Tabby's Star) Nova Ser 2025 (V691 Ser)     2MFGC 13744 - Galaxy with Type II Supernova 2024afyu M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe     NGC 7094 - Planetary Nebula NGC 7128 - Open Cluster (Herschel VII-40)     UGC 10717 - Spiral Galaxy UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw     Variable Stars (photometric monitoring) - U And, T CrB, KIC 8462852, RR Lyr     Nearby Stars (astrometric monitoring) - None

- Late night session (3.9 hr), finished early at around 01:00 LT due to cloud     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature : 10°C (min). - CCD Temperature:  -15°C - Notes from 2025-09-11>>           -

Observing Result

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C/2023 A3 (Tsuchinshan-ATLAS) - Comet

C/2023 A3 (Tsuchinshan-ATLAS) - 2025-09-11 (passing through Hercules) Sun Distance 5.09 AU (receeding) Earth Distance 4.87 AU (729.1 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2025-09-11 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -6.52 arcsec/hr, Dec -21.99 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 9 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 20:36 UT (#1361007-16) 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/2023 A3 Tsuchinshan-ATLAS on Comets 2024 Page >>
Images of C/2023 A3 Tsuchinshan-ATLAS on Comets 2025 Page >>

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KIC 8462852 - Variable Star (Tabby's Star)

KIC 8462852 / Tabby's Star (Cygnus) Alias: Boyajian's Star, WTF Star ("Where’s the Flux?") Distance 1470 ly. Magnitude +11.7 Star shows large irregular dimmings. KIC 8462852 shown by white cross-hairs

KIC 8462852  - Image (2025-09-11) Measured Mag +11.89 ('V') from CCDSoft Cursor Information

Annotated CCD Image  (50% size, linear scale) 3 x 60s exposure (average combine), 3x3 binning, V Filter 2025-09-11 22:31 UT (#1361071-73) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

KIC 8462852  - Earlier Image (2025-04-12) Measured Mag +11.81 ('V') from CCDSoft Cursor Information

Annotated CCD Image  (50% size, linear scale) 3 x 60s exposure (average combine), 3x3 binning, V Filter 2025-04-12 00:12 UT (#1315090-92) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

KIC 8462852  - Previous Image (2023-08-19) Measured Mag +11.93 ('V') from CCDSoft Cursor Information

Annotated CCD Image  (50% size, linear scale) 3 x 60s exposure (average combine), 3x3 binning, V Filter 2023-08-19 23:48 UT (#1131095-97) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

KIC 8462852  - Previous Image (2022-05-12) Measured Mag +11.89 (V)

Annotated CCD Image  (50% size, linear scale) 3 x 60s exposure (average combine), 3x3 binning, V Filter 2022-05-12 01:25 UT (#1009094-96) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

KIC 8462852  - Previous Image (2022-03-20) Measured Mag +12.01 (V)

Annotated CCD Image  (50% size, linear scale) 3 x 60s exposure (average combine), 3x3 binning, V Filter 2022-03-20 04:18 UT (#989258-60) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

KIC 8462852 Links: AAVSO Info : https://www.aavso.org/category/tags/kic-8462852 Unofficial Page for Where's the Flux? Discovery Paper:  1509.03622.pdf (arxiv.org)

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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 - 2025-09-11 (T+56.0d) Image below (2025-09-11.876) was taken 56.0 days after discovery of Nova Ser 2025 Position of nova (distinct but fading) is shown by white cross-hairs Measured Magnitude +14.50 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 21:04 UT (#1361028-32) 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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2MFGC 13744 - Galaxy with Type II Supernova 2024afyu

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M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe  (non-detection)

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NGC 7094 - Planetary Nebula

Deep Sky Challenge object in Sep 2017 edition of Astronomy Now magazine

NGC 7094 (Pegasus)  [ Planetary Nebula ]

Annotated CCD Image (50% size, square root scale) 6 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 21:20 UT (#1361038-44) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 7094 - detail

CCD Image (100% size, square root scale, cropped) Image details as above

Negative CCD Image (100% size, square root scale, cropped) Image details as above

NGC 7094 - Earlier Image (Jul 2018) - detail

CCD Image (100% size, cropped) Adjusted Black-White Range 4 x 90s exposure (average combine), 3x3 binning, C Filter 2018-07-23 01:22h UT (#614011-15) 12" LX200R  (at f/10.4) + ST-10XME

NGC 7094 - earlier image attempt (2017)

CCD Image (100% size, cropped, gaussian blur) 4 x 30s exposure (average combine), 3x3 binning, C Filter 2017-11-02 19:07h UT (#603045-54) 12" LX200R  (at f/10.4) + ST-10XME

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NGC 7128 - Open Cluster (Herschel VII-40)

NGC 7128 / Herschel VII-40 (Delphinus)  [ Open Star Clusters ]   [ Herschel 400 Objects ]

Annotated CCD Image (50% size, linear scale) 9 x 15s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 22:22 UT (#1361060-68) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 7128 / Herschel VII-40 - Detail

Annotated CCD Image (100% size, linear scale, cropped) Image details as above

NGC 7128 - Earlier Image (2017)

CCD Image (50% size) 6 x 15s exposure (average combine), 3x3 binning, C Filter 2017-11-02 22:39h UT (#603348-55) 12" LX200R  (at f/10.4) + ST-10XME [ 100% size ]

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UGC 10717 - Spiral Galaxy

UGC 10717 - (Hercules)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 22:06 UT (#1361053-57) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10717 - Detail

Annotated CCD Image (150% size, square root scale, cropped) Image details as above

UGC 10717 with SN 2022ybd (Hercules) SN 2022ybd (Type: Ia) discovered 2022-10-17.123 UT by ZTF Alias: ZTF22abnvzhx, ATLAS22bjhn Discovery Mag 19.98 (r-ZTF Filter) ( TNS 2022ybd )

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 22:06 UT (#1361053-57) 12" LX200R  (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGC 10809 & PGC 200345  - Galaxy with Type Ic-BL Supernova 2025vaw

UGC 10809 with SN 2025vaw (Hercules) AT 2025vaw (Type: unk) discovered 2025-08-22.925 UT by ATLAS using  ATLAS Teide Tenerife Telescope Alias: ATLAS25kew, ZTF25abkwytp Discovery magnitude 16.90 (wide-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 20.19  ( TNS 2025vaw)

UGC 10809 with SN 2025vaw - 2025-09-11 (T+20.0d) Image below (2025-09-11.899) was taken 20.0 days after discovery of 2025vaw Position of reported supernova (faint, fading) is shown by white cross-hairs Supernova appears to be associated with PGC 200345  (catalog mag +16.8) rather than with UGC 10058 Measured Magnitude +15.66 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-09-11 21:40 UT (#1361046-48) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025vaw (in UGC 10809 / PGC 200345) on Supernova 2025 Page >>

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