A promising comet that should become brighter in end of October 2025, according to news updt to beginning of October. I imaged the comet from the Star Party of Saint Barthelemy, in the night of 19 Sept 2025 with my standard deep sky setup. See below for more info.
19 September 2025
Click on the image for high res version. Starlink hires here. MOUSE OVER for Starlink view.
|
|
|
| Optics | TEC
140 |
| Focal
Length |
1011
mm |
| Focal Ratio | f/7.2 |
| Exposure Time | Total 85 min or 1 h 25 min, L
filter 17 frames x 300 s |
| Camera | ZWO
ASI 6200 MM @-10°C
bin 2x2 |
| Location | Saint
Barthelemy, Lissè field, AO, Italy, at
1600 m height |
| Date |
19
September 2025 |
| Mount | Gemini
G41 |
| Tracking | ZWO ASI 174 mini on an 80mm f/5
refractor - tracking on comet nucleus |
| Temperature and humidity | T=+9°C,
RH=70% |
| Sky brightness at zenith (with SQM-L) | 21.2
mag/arcsec^2 |
| Notes | Comet
quite high on the eastern horizon, about
25-30°. Processing with Siril to get both the comet and the stars fixed. Composition for comet: registration on comet center, starnet removal of stars before average on each single frame, average with rejection and linear rejection with parameters down 2 up 1. Composition on stars, same as comet but stars registration, starnet separation of starless field on single frames, composition with simple average. Fusion of both images. STARLINK version obtained from registration on stars and stacking with maximum; comet is not well tracked. |
