David's Astronomy Pages Images - Session 1303 (2025-03-18)

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Session Notes

29P/Schwassmann-Wachmann - Comet C/2023 A3 (Tsuchinshan-ATLAS) - Comet     AT 2022xao - Type QSO Transient, QSO B0647+250 AT 2022aees - ?AGN Type Transient AT 2023csw - CV Type Transient AT 2023huk - Transient  (non-detection) AT 2023yek - Transient  (non-detection) AT 2024wqf - Type AGN Transient (4C 27.50)     ARP 176 - Galaxies (NGC 4933A, 4933B, 4933C) ARP 244 - Spiral Galaxies (NGC 4038 & NGC 4030,  "The Antennae", Caldwell 60/61) CGCG 073-009 - Galaxy with Type Ia Supernova 2024kbl Hickson 42 - Galaxy Group (NGC 3091 et al) KUG 1208+328 - Spiral Galaxy with Type Ia Supernova 2024zsr  (non-detection) LEDA 83727 - Galaxy with Type Ia-91bg Supernova 2023exr  (non-detection) LEDA 2243580 - Galaxy with Type Ia Supernova 2025gp      MCG -2-28-37 - Spiral Galaxy with Transient AT 2025fk      NGC 3277 - Spiral Galaxy with Type Ib-Ca-rich Supernova 2025coe  NGC 3710 - Elliptical Galaxy with Type Ia Supernova 2023bbp   (non-detection) NGC 4568 - Spiral Galaxy with Type II Supernova 2023ijd NGC 4722 - Spiral Galaxy with Type II Supernova 2024ablh  (non-detection)     PGC 1724177 - Galaxy     UGCA 195 - Spiral Galaxy (PGC 29140)   (non-detection)     Variable Stars (photometric monitoring) - T CrB, BL Lac, RR Leo     Nearby Stars (astrometric monitoring) - CN Leo

- All-night session (8.3h), slightly delayed by early evening cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -2°C (min) - CCD Temperature: -20°/--25°C - Notes from 2025-03-18 >>     -

Observing Result

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-03-18 (passing through Leo) Sun Distance 6.27 AU (turning) Earth Distance 5.42 AU (810.7 million km)		29P/Schwassmann-Wachmann - 2025-03-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -12.21 arcsec/hr, Dec 3.22 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 5 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 21:45 UT (#1303036-40) 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 29P/Schwassmann-Wachmann on Comets 2023 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2024 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2025 Page >>

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C/2023 A3 (Tsuchinshan-ATLAS) - Comet

C/2023 A3 (Tsuchinshan-ATLAS) - 2025-03-19 (passing through Delphinus) Sun Distance 3.07 AU (receeding) Earth Distance 3.54 AU (529.4 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2025-03-19 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 4.73 arcsec/hr, Dec 25.59 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 03:56 UT (#1303172-74) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, square root scale, cropped) 9 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 03:58 UT (#1303172-81) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
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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AT 2022xao - Type QSO Transient, QSO B0647+250

AT 2022xao (Gemini) AT 2022xao (Type: QSO) discovered 2022-10-02.836 UT by Gaia Alias: Gaia22eda Alerting Magnitude 16.48 (vs Historic magnitude 15.20) Fading in known blazar QSO B0647+250  ( TNS 2022xao | Gaia22eda)

AT 2022xao - 2025-03-18 (T+898.1d) Image below (2025-03-18.888) was taken 898.1 days after discovery of 2022xao Position of QSO (faint) is shown by white cross-hairs Measured Magnitude +16.00 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 21:27 UT (#1303029-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022xao (QSO B0647+250) on Transients 2022 Page >>

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AT 2022aees - ?AGN Type Transient

AT 2022aees (Hercules) AT 2022aees (Type: CV) discovered 2022-12-29.980 UT by Gaia using Gaia Spacecraft Alias: Gaia22eps Alerting Magnitude 16.77 (G-Gaia Filter) vs Historic magnitude 17.92 +/- 0.22 Brightening in AGN candidate 2MASS J17064711+2732591  ( TNS 2022aees | Gaia22eps)

AT 2022aees - 2025-03-19 (T+810.2d) Image below (2025-03-19.139) was taken 810.2 days after discovery of 2022aees Position of QSO (faint) is shown by white cross-hairs Measured Magnitude +17.31 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 03:23 UT (#1303158-62) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022aees on Transients 2022 Page >>

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AT 2023csw - CV Type Transient

AT 2023csw (Vulpecula) AT 2023csw (Type: CV) discovered 2023-03-03.202 UT by Gaia Alias: Gaia23ayn Alerting Magnitude 16.88 (G-Gaia Filter) vs Historic Magnitude  17.15 +/- 0.05 (SD) ~0.2 mag rise in red Gaia source  ( TNS 2023csw | Gaia15abf )

AT 2023csw - 2024-09-12 (T+559.7d) Image below (2024-09-12.938) was taken 559.7 days after discovery of 2023csw Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +17.04 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-09-12 22:34 UT (#1242038-41) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023csw on Transients 2023 Page >>

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AT 2023huk - Transient  (non-detection)

AT 2023huk (Hercules) AT 2023huk (Type: unk) discovered 2023-05-08.278 UT by ATLAS Alias: ATLAS17fes Discovery magnitude 16.11 (orange-ATLAS Filter)  vs Prior Non-Detection Limiting Magnitude 18.23  ( TNS 2023huk )

AT 2023huk - 2025-03-19 (T+680.8d) Image below (2025-03-19.124) was taken 680.8 days after discovery of 2023huk Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection, Limiting Magntitude +19.3 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 03:06 UT (#1303151-55) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023huk on Transients 2023 Page >>

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AT 2023yek - Transient  (non-detection)

AT 2023yek (Hercules) AT 2023yek (Type: unk) discovered 2023-11-16.524 UT by Gaia Alias: Gaia23dfu Discovery magnitude 16.75 (G-Gaia Filter)  vs Prior Non-Detection Limiting Magnitude 18.23  ( TNS 2023yek | Gaia23dfu )

AT 2023yek - 2025-03-19 (T+488.6d) Image below (2025-03-19.147) was taken 488.6 days after discovery of 2023yek Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magntitude +18.7 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 03:41 UT (#1303164-68) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023yek on Transients 2023 Page >>

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AT 2024wqf - Type AGN Transient (4C 27.50)

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ARP 176 - Galaxies (NGC 4933A, 4933B, 4933C)

ARP 176 / NGC 4933 (Virgo) NGC 4933A, 4933B, 4933C  [ ARP Galaxies ] Other galaxies in same FOV are PGC 45169 (catalog mag +15.2), PGC 965387 (catalog mag +16.0)

Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 23:58 UT (#1303088-91) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

ARP 176 - Detail

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

Annotated negative CCD Image (125% size, square root scale, cropped) Image details as above

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ARP 244 - Spiral Galaxies (NGC 4038 & NGC 4030,  "The Antennae", Caldwell 60/61)

ARP 244 (Corvus) "The Antennae" (NGC 4038 and NGC 4039) Caldwell 60/61  [ ARP Galaxies ] [ Caldwell Objects ]

Annotated CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 23:06 UT (#1303069-71) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

ARP 244 - Detail

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

ARP 244 - Detail showing Antennae The two "antennae" are just visible in this view, extending out to the left of the galaxy pair

Annotated negative CCD Image (70% size, square root scale) Image details as above

ARP 244 - Earlier Image (Apr 2011)

Annotated CCD Image (100% size, cropped) 9 x 60 sec exposure (average combine), 3x3 binning, C Filter  2011-04-05 23:33 h UT  (#466047-57) 12" LX200R  (at f/9.7) + ST-10XME

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CGCG 073-009 - Galaxy with Type Ia Supernova 2024kbl

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Hickson 42 - Galaxy Group (NGC 3091 et al)

Hickson 42 (Hydra) Alias: NGC 3091 et al [ Hickson Galaxy Groups ]

CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 22:23 UT (#1303055-59) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

CCD Image (50% size) Image details as above

Hickson 42 - Detail NGC 3091 (catalog mag +11.2), NGC 3096 (catalog mag +13.8), PGC 28922 (catalog mag +14.3),  PGC 28926 (catalog mag +16.1) PGC 852084 (catalog mag +15.8) (Note: a number of fainter galaxies are also visible in the image)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 22:23 UT (#1303055-59) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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

Hickson 42 - Negative image

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

Hickson 42 - Earlier Image (Dec 2014) NGC 3091 (catalog mag +11.2), NGC 3096 (catalog mag +13.8), PGC 28922 (catalog mag +14.3),  PGC 28926 (catalog mag +16.1) PGC 852084 (catalog mag +15.8) (Note: a number of fainter galaxies are not visible in this image)

Annotated CCD Image (100% size, cropped) 5 x 90 sec exposure (average combine), 3x3 binning, C Filter 2014-12-03 04:49hUT (#573783-89) 12" LX200R  (at f/10.4) + ST-10XME

Hickson 42 - Earlier Wider View Image (Dec 2014)

CCD Image (50% size) Image as above

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KUG 1208+328 - Spiral Galaxy with Type Ia Supernova 2024zsr (non-detection)

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LEDA 83727 - Galaxy with Type Ia-91bg Supernova 2023ex (non-detection)

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LEDA 2243580 - Galaxy with Type Ia Supernova 2025gp

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MCG -2-28-37 - Spiral Galaxy with Transient AT 2025fk

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NGC 3277 - Spiral Galaxy with Type Ib-Ca-rich Supernova 2025coe

NGC 3277 with SN 2025coe (Leo Minor) SN 2025coe (Type: Ib-Ca-rich) discovered 2025-02-24.634 UT by Koichi Itagaki using 0.5-m F/6.9 Telescope Alias: ATLAS25caa, ZTF25aahsvoc Discovery Magnitude 17.4 (Clear Filter) SN (z=0.00472) is suspected to be located in NGC 3277 (z=0.004720, value from NED), but has a large offset.  ( TNS 2025coe )

NGC 3277 with SN 2025coe (T+22.2d) NGC 3277 was Deep Sky Challenge, Associated Object, May 2020 Member of LGG 197, Alias: Herschel II-359 [ Deep Sky Challanges (Ast.Now) ,  Herschel 400 Objects ] Galaxy looks more like an elliptical galaxy rather than a spiral one !

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 20:48 UT (#1303005-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3277 with SN 2025coe - 2025-03-18 (T+22.2d) Image below (2025-03-18.861) was taken 22.2 days after discovery of 2025coe Position of reported supernova (faint) is shown by white cross-hairs Measured Magnitude +17.06 (Clear Filter) Offset from NGC 3277 is particularly large and there is some doubt as whether it is in NGC 3277 or not

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 20:48 UT (#1303005-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3277  -  Earlier Image (Feb 2021)

CCD Image (100% size, log scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-02-19 01:04 UT (#860055-59) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025coe (in NGC 3277) on Supernova 2025 Page >>

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NGC 3710 - Elliptical Galaxy with Type Ia Supernova 2023bbp (non-detection)

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NGC 4568 - Spiral Galaxy with Type II Supernova 2023ijd (non-detection)

NGC 4568 with SN 2023ijd (Virgo) SN 2023ijd (Type: II) discovered 2023-05-14.200 UT by ASAS-SN using ASASSN-Cassius Telescope Alias: ASASSN-23du, PS23den, ZTF23aajrmfh Discovery Magnitude 16.8 (g-Sloan Filter)  ( TNS 2023ijd )

NGC 4568 with SN 2023ijd - 2025-03-19 (T+674.9d) Image below (2025-03-19.069) was taken 674.9 days after discovery of 2023ijd Position of earlier SN (faded & no longer visible) is indicated by white cross-hairs.

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 01:49 UT (#1303122-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4568 with SN 2023ijd - Earlier Image, 2024-01-07 (T+238.0d) Image below (2024-01-07.210) was taken 238.0 days after discovery of 2023ijd Position of earlier reported SN (very faint) is indicated by white cross-hairs. Measured Magnitude ?

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-01-07 05:12 UT (#1179220-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023ijd (in NGC 4568) on Supernova 2023 Page >>

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NGC 4722 - Spiral Galaxy with Type II Supernova 2024ablh (non-detection)

NGC 4722 with SN 2024ablh (Corvus) SN 2024ablh (Type: II) discovered 2024-11-18.546 UT by ALeRCE Alias: ZTF24abszdqt Discovery Magnitude 16.3 ( Clear Filter)  ( TNS 2024ablh )

NGC 4722 with SN 2024ablh - 2025-03-18 (T+120.4d) Image below (2025-03-18.979) was taken 120.4 days after discovery of 2024ablh Position of reported SN (not visible) is indicated by white cross-hairs Non-Detection Limiting Magnitude +18.7 (Clear Filter).

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 23:37 UT (#1303080-83) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024ablh (in NGC 4722) on Supernova 2024 Page >>

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PGC 1724177 - Galaxy

PGC 1724177 (Gemini)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 21:27 UT (#1303029-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGCA 195 - Spiral Galaxy (PGC 29140)   (non-detection)

UGCA 195 (Hydra) Alias: PGC 29140 catalog mag +14.5, Dec -21d 25m  [ UGCA Galaxies ] Position of UGCA 195 (not visible) is indicated by white cross-hairs Poor quality image (poor sky transparency, single frame) (Target to be rescheduled)

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-03-18 22:40 UT (#1303063) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 195 - Detail Position of UGCA 195 (not visible) is indicated by white circle

Annotated CCD Image (125% size, square root scale, cropped) Image details as above

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