David's Astronomy Pages
Images - Session 1335 (2025-06-15)

Objects Session Notes
Bullet AT 2025kyb - CV Type Transient  (non-detection)
   
Bullet NGC 5957 - Spiral Galaxy with Type Ia Supernova 2025fvw
   
Bullet Variable Stars (photometric monitoring)
- T CrB, U Her
   
   
Bullet Nearby Stars (astrometric monitoring)
- 61 Cyg
   
- Post midnight session (1.5 hr).  Short summer night
   
- 12" LX200 + ST-10XME for imaging
- TS 80mm APO + ZWO ASI178MC for guiding & imaging
- Ambient Temperature : 9.5°C (min)
- CCD Temperature: -10°C
- Notes from 2025-06-15 >>
   
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Observing Result

Image

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AT 2025kyb - CV Type Transient  (non-detection)

AT 2025kyb (Hercules)
AT 2025kyb (Type: CV) discovered 2025-05-18.071 UT by GOTO
using GOTO-North Telescope
Alias: GOTO25ctd
Discovery Magnitude 16.34 (L-GOTO Filter)
 ( TNS 2025kyb )

 
AT 2025kyb - 2025-06-16 (T+29.0d)
Image below (2025-06-16.023) was taken 29.0 days after discovery of 2025kyb
Position of reported transient (not visible) is shown by white cross-hairs 
Non-Detection Limiting Magnitude +17.8 (Clear Filter)

Image

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-06-16 00:34 UT (#1335046-47)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
 
Images of AT 2025kyb on Transients 2025 Page >>

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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 - 2025-06-15 (T+81.2d)
Image below (2025-06-15.992) was taken 81.2 days after discovery of 2025fvw
Position of reported supernova (fading, faint) is shown by white cross-hairs 
Estimated Magnitude +16.5  (Clear Filter)
Poor quality image (bright sky background, single frame)

Image

Annotated CCD Image (125% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-06-15 23:49 UT (#1335012)
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)

Image

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

Image

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

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