Comet C/2025 R2 (SWAN)
Taken by Mieczyslaw Leszek Paradowski on October 20, 2025 @
Pryszczowa Góra, Poland
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable
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Details:
Comet C/2025 R2 (SWAN) on 2025 October 20 at 18:38 UT (center), Pryszczowa Góra, Poland, Bortle 4.6
Telescope: Orestegor f=300mm/4 @f/5.6
Camera: Canon 6D 1600 ISO exposure 10x15s
Tracker mount: Star Adventurer.
Comet alt. 15d51'
Aperture photometry performed in IRIS- written by Christian Buil.
Total comet magnitude mC=5.2 +/-0.1 mag, magnitude in V band mV=5.8 +/-0.1 mag @Dia=12.0', effective diameter of the comet's nucleus is 2.27 +/-0.55 km assuming phase coefficient 0.030+/-0.005 mag/deg and albedo 0.04
Delta=0.2615 au, r=0.9836 au, Elong.: 80deg
Phase: 85.05deg
FOV 77' x 77'
Res 4.5"/pixel; Scale: 854.03 km/pixel
All frames were calibrated (darks, bias, flats) and stacked on the comet.
Processing: DeepSkyStacker, IRIS -written by Christian Buil, GIMP
Details on the photos.
I determined the effective diameter of the comet's nucleus using my method that was published in Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, March 2020 Pages 4175-4188, https://doi.org/10.1093/mnras/stz3597
Photographer's website:
No URL provided.
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