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 Images - Session 1348 (2025-08-14)

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Objects Session Notes
Bullet AT 2025srn - Type MP Transient  / Minor Planet  (non-detection)
   
Bullet SN 2025taz - Type Ia Supernova in WISEA Galaxy (PGC 166556)
   
Bullet Variable Stars (photometric monitoring)
- SS Cyg
   
Bullet Nearby Stars (astrometric monitoring)
- None
   
- Late night session (4.3hr) significantly interrupted by cloud
   
- 12" LX200 + ST-10XME for imaging
- TS 80mm APO + ZWO ASI178MC for guiding & imaging
- Ambient Temperature : 13°C (min)
- CCD Temperature:  -10°C
- Notes from 2025-08-14 >>
   
-
   

Observing Result

Image

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AT 2025srn - Type MP Transient / Minor Planet (non-detection)

AT 2025srn (Pegasus)
AT 2025srn (Type: MP) discovered 2025-07-30.421 UT by GEOTS
Alias: GEOTS-Balaji-2025-08, TCP J23501909+1036467, 179 Klytaemnestra
Discovery Magnitude 11.9 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 18.0
(179) Klytaemnestra asteroid detected at the transient's location.
 ( TNS 2023cuz | Gaia23bar)
 
AT 2025srn - 2025-08-15 (T+15.7d)
Image below (2025-08-15.111) was taken 15.7 days after discovery of 2025srn
Position of reported transient (not visible) is shown by white cross-hairs 
Non-Detection Limiting Magnitude +18.6 (Clear Filter)

It is suspected that transient object detected by GEOTS was most probably
a minor planet (which would explain the MP designation in  Rochester data file).  This seems
to be confirmed by a comment that was added to TNS page by Balaji Kumar  on 2025-07-31
"(179) Klytaemnestra asteroid detected at the transient's location". 

Image
Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-08-15 02:47 UT (#1348033-36)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
 
 

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SN 2025taz - Type Ia Supernova in WISEA Galaxy (PGC 166556)

SN 2025taz (Hercules)
Alias: In WISEA J184431.34+122151.5
SN 2025taz (Type: Ia) discovered 2025-08-03.179 UT by ZTF
Alias: ZTF23aaritkm
Discovery Magnitude 18.55 (r-ZTF Filter)
vs Prior Non-Detection Limiting Magnitude 20.85 (g-ZTF Filter)
 ( TNS 2025taz )
 
WISEA Galaxy (PGC 166556) with SN 2025taz (T+11.8d)

Image
Annotated CCD Image (55% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-08-14 22:57 UT (#1348005-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
 
SN 2025taz - 2025-08-14 (T+11.8d)
Image below (2025-08-14.952) was taken 11.8 days after discovery of 2025taz
Position of reported transient (faint but distinct) is shown by white cross-hairs 
Measured Magnitude +14.83 (Clear Filter)

Image
Annotated CCD Image (100% size, linear scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-08-14 22:57 UT (#1348005-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
 
SN 2025taz - 2025-08-14 (T+11.8d)
Image below (2025-08-14.952) was taken 11.8 days after discovery of 2025taz
Position of reported transient (faint but distinct) is shown by white cross-hairs 
Measured Magnitude +14.83 (Clear Filter)

Image
Annotated CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-08-14 22:57 UT (#1348005-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
 
Images of SN 2025taz (in WISEA Galaxy) on Supernova 2025 Page >>

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This Web Page: Images - Session 1348 (2025-08-14)
Last Updated : 2025-08-17
Site Owner : David Richards
Home Page : David's Astronomy Web Site