David's Astronomy - Images 2025-09-12 (S1362)

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Images - Session 1362 (2025-09-12)

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Objects Session Notes

C/2025 A6 (Lemmon) - Comet

Nova Ser 2025 (V691 Ser)

AT 2023mil - Type CV? Transient

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

AT 2025usz - Type Nova Transient

AT 2025xdz - Type CV? Transient

M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe

MCG -1-60-15 - Spiral Galaxy

NGC 4475 - Spiral Galaxy with Type II Supernova 2025nat

NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw

UGC 11555 - Spiral Galaxy with Type Ia Supernova 2023ehl

UGC 11649 - Spiral Galaxy with Type II Supernova 2023eds (non-detection)

UGC 12720 - Spiral Galaxy with Type II Supernova 2025nno

- AT2025xea, NGC 899 (UGCA 26), NGC 2744 w/SN2025oq attempts failed (due to cloud)

Variable Stars (photometric monitoring)

- RX And, TT Ari, T CrB, SS Cyg, BL Lac, CY Lyr, RR Lyr

Nearby Stars (astrometric monitoring)

- HH And

- All-night session (7.7 hr), affected in part by passing thin cloud and ended early by cloud.

- 12" LX200 + ST-10XME for imaging

- TS 80mm APO + ZWO ASI178MC for guiding & imaging

- Ambient Temperature : 10°C (min).

- CCD Temperature: -10°/-15°C

- Notes from 2025-09-12 >>

-

C/2025 A6 (Lemmon) - Comet

C/2025 A6 (Lemmon) - 2025-09-13 (passing through Lynx) Sun Distance 1.29 AU (approaching) Earth Distance 1.65 AU (246.4 million km)		C/2025 A6 (Lemmon) - 2025-09-13 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 94.90 arcsec/hr, Dec 35.27 arcsec/hr)

Annotated CCD Image (50% size, square root scale) 3 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-13 03:17 UT (#1362187-89) 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) 13 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-09-13 03:22 UT (#1362184-98) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of C/2025 A6 (Lemmon) on Comets 2025 Page >>

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 - 2025-09-12 (T+56.9d)
Image below (2025-09-12.844) was taken 56.9 days after discovery of Nova Ser 2025
Position of nova (distinct but fading) is shown by white cross-hairs
Measured Magnitude +14.67 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 20:18 UT (#1362005-09)
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 >>

AT 2023mil - Type CV? Transient

AT 2023mil (Cygnus)
AT 2023mil (Type: CV?) discovered 2023-07-01.806 UT by XOSS
Alias: KATS23N002, TCP J20395776+3524202
Discovery Magnitude 16.5 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 18.0
UG candidate classified by XOSS
( TNS 2023mil)

AT 2023mil - 2025-09-12 (T+804.1d)
Image below (2025-09-12.944) was taken 804.1 days after discovery of 2023mil
Position of earlier transient (very faint) is shown by white cross-hairs
Measured Magnitude +18.26 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 22:47 UT (#1362068-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023mil on Transients 2023 Page >>

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

AT 2025kjp (Cassiopeia)
AT 2025kjp (Type: CV?) discovered 2025-05-12.836 UT by XOSS
Alias: KATS25J012, TCP J00383155+4956163
Discovery Magnitude 15.21 (Clear Filter)
CV candidate classified by XOSS
( TNS 2025kjp)

AT 2025kjp - 2025-09-13 (T+123.3d)
Image below (2025-09-13.108) was taken 123.3 days after discovery of 2025kjp
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +19.1 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 02:45 UT (#1362170-74)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025kjp - Detail (T+123.3d)
Position of earlier transient (not visible) is shown by black cross-hairs

Annotated negative CCD Image (150% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 02:45 UT (#1362170-74)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025kjpl on Transients 2025 Page >>

AT 2025usz - Type Nova Transient

AT 2025usz (Pegasus)
AT 2025usz (Type: Nova) discovered 2025-08-18.305 UT by ZTF
Alias: ZTF25abjnifk, TCP J22135399+3015357
Discovery Magnitude 16.64 (Clear Filter)
( TNS 2025usz )

AT 2025usz - 2025-09-12 (T+25.7d)
Image below (2025-09-12.958) was taken 25.7 days after discovery of 2025usz
Position of reported transient (faint, fading) is shown by white cross-hairs
Measured Magnitude +16.39 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 23:06 UT (#1362074-78)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025usz on Transients 2025 Page >>

AT 2025xdz - Type CV? Transient

AT 2025xdz (Aquila)
AT 2025xdz (Type: CV?) discovered 2025-09-09.615 UT by Ziyang Mai
using C8HD F/7 Telescope
Discovery Magnitude 16.65 (Clear Filter)
Possible CV in Aql.
( TNS 2025xdz )

AT 2025xdz - 2025-09-12 (T+3.3d)
Image below (2025-09-12.898) was taken 3.3 days after discovery of 2025xdz
Position of reported transient (very faint) is shown by white cross-hairs
Measured Magnitude +14.86 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 21:42 UT (#1362041-45)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025xdz on Transients 2025 Page >>

M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe

M31 with AT 2025wwe (Andromeda)
AT 2025wwe (Type: EGN) discovered 2025-09-04.455 UT by ZTF
using Palomar 1.2m Oschin Telescope
Alias: ZTF25aborgma, PNV J00431125+4146081
Discovery Magnitude 17.86 (g-ZTF Filter)
Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot
( TNS 2025wwe )

Nova M31 AT 2025wwe - 2025-09-12 (T+8.5d)
Image below (2025-09-12.922) was taken 8.5 days after discovery of 2025wwe
Position of reported transient (faint) is shown by white cross-hairs
Measured Magnitude +17.95 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 22:16 UT (#1362053-57)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025wwe (in M31) on Transients 2025 Page >>

MCG -1-60-15 - Spiral Galaxy

MCG -1-60-15 - Spiral Galaxy
Alias : PGC 71954

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 01:38 UT (#1362148-52)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

MCG -1-60-15 - Earlier Image (Sep 2024)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2024-09-01 01:19 UT (#1237152-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4475 - Spiral Galaxy with Type II Supernova 2025nat

NGC 4475 with SN 2025nat (Coma Berenices)
SN 2025nat (Type: II) discovered 2025-06-07.318 UT by ATLAS
using ATLAS Haleakala Telescope
Alias: ATLAS25fyr, GOTO25dmg, ZTF25aauzryv
Discovery Magnitude 18.36 (orange-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude 18.78
( TNS 2025nat )

NGC 4475 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 20:34 UT (#1362013-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4475 with SN 2025nat - 2025-09-12 (T+97.5d)
Image below (2025-09-12.851) was taken 97.5 days after discovery of 2025nat
Position of reported supernova (barely visible) is shown by white cross-hairs
Limiting Magnitude +18.8 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 20:34 UT (#1362013-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025nat (in NGC 4475) on Supernovae 2025 Page >>

NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw

NGC 5957 with SN 2025fvw (Serpens)
SN 2025fvw (Type: Ia) discovered 2025-03-26.799 UT by Koichi Itagaki
using XingLong Telescope
Alias: ZTF25aaktqzg, GOTO25bhh, PS25avu, ATLAS25dcd
Discovery Magnitude 17.4 (Clear Filter)
( TNS 2025fvw )

NGC 5957 with SN 2025fvw - 2025-09-12 (T+170.1d)
Image below (2025-09-12.868) was taken 170.1 days after discovery of 2025fvw
Position of reported supernova (very faint) is shown by white cross-hairs
Estimated Magnitude +18.6 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 20:58 UT (#1362020-24)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 5957 with SN 2025fvw - Earlier Image, 2025-04-08 (T+12.2d)
Image below (2025-04-08.051) was taken 12.2 days after discovery of 2025fvw
Position of reported supernova (distinct, brightening, peak) is shown by white cross-hairs
Measured Magnitude +13.70 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-08 01:21 UT (#1312143-47)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SN 2025fvw - Light Curve

Images of SN 2025fvw (in NGC 5957) on Supernova 2025 Page >>

UGC 11555 - Spiral Galaxy with Type Ia Supernova 2023ehl

UGC 11555 with SN 2023ehl (Delphinus)
SN 2023ehl (Type: Ia) discovered 2023-03-27.969 UT by ASAS-SN
using ASASSN-Paczynski Telescope
Alias: ASASSN-23ch, Gaia23bhn, ZTF23aaekiqe
Discovery Magnitude 17.20 (g-SLOAN Filter)
vs Prior Non-Detection Limiting Magnitude 17.70
( TNS 2023ehl )

UGC 11555 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 00:15 UT (#1362101-05)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11555 - Detail

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 20:34 UT (#1362013-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11555 with SN 2023ehl - 2025-09-13 (T+900.0d)
Image below (2025-09-13.004) was taken 900.0 days after discovery of 2023ehl
Position of earlier supernova (no longer visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +18.4 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 00:15 UT (#1362101-05)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023ehl (in UGC 11555) on Supernovae 2023 Page >>

UGC 11649 - Spiral Galaxy with Type II Supernova 2023eds

UGC 11649 with SN 2023eds (Aquarius)
SN 2023eds (Type: II) discovered 2023-03-19.543 UT by Gaia
using Gaia Spacecraft Telescope
Alias: Gaia23bel
Discovery Magnitude 16.18 (G-Gaia Filter)
Candidate SN near galaxy UGC 11649
( TNS 2023ehl | Gaia23bel )

UGC 11649 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 23:27 UT (#1362081-83)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11649 - Detail

Annotated CCD Image (150% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-12 23:27 UT (#1362081-83)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11649 with SN 2023eds - 2025-09-12 (T+908.4d)
Image below (2025-09-12.973) was taken 908.4 days after discovery of 2023eds
Position of earlier supernova (no longer visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +18.5 (Clear Filter)

Images of SN 2023eds (in UGC 11649) on Supernovae 2023 Page >>

UGC 12720 - Spiral Galaxy with Type II Supernova 2025nno

UGC 12720 with SN 2025nno (Pisces)
SN 2025nno (Type: II) discovered 2025-06-14.561 UT by ATLAS
using ATLAS Haleakala Telescope
Alias: ATLAS25gde
Discovery Magnitude 18.19 (orange-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude +18.76
( TNS 2025nno )

UGC 12720 - Spiral Galaxy
Glare in upper left is from HIP 116771 (catalog mag 4.13) located 4.5' outside FOV

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 02:00 UT (#1362155-59)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 12720 with SN 2025nno - 2025-09-13 (T+90.5d)
Image below (2025-09-13.077) was taken 90.5 days after discovery of 2025nno
Position of reported supernova (very faint) is shown by white cross-hairs
Estimated Magnitude +18.5 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-13 02:00 UT (#1362155-59)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025nno (in UGC 12720) on Supernovae 2025 Page >>

This Web Page:	Images - Session 1362 (2025-09-12)
Last Updated :	2025-09-18
Site Owner :	David Richards
Home Page :	David's Astronomy Web Site

David's Astronomy Pages Images - Session 1362 (2025-09-12)

Observing Result