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Details:
Time: 01:53UT 2025-09-27 Exp.8 x 125sec
Tel: C14 @ f/5.2 ST-7 CCD -26°C 1.0"/pix Paramount GT-1100S Tenagra Norway
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.
Plutonium Isotope.Atom-weight 238.Half-life 87.7 years gives power to the Voyagers, New Horizon and other distant spacecrafts.
AT2025pht (= ASASSN-25cw), TNS discovered 2025/06/29.430 by All Sky Automated Survey for SuperNovae (ASAS-SN)
Found in NGC 1637 at R.A. = 04h41m28s.834, Decl. = -02°51'55".87
Located 9".7 east and 27".3 south of the center of NGC 1637
Mag 13.3:6/29, Type SN IIP (zhost=0.002392) (References: SN 1999em)
Reference David Bishop http://www.rochesterastronomy.org/snimages/
Discovery page (References: TNS):
https://www.wis-tns.org/object/2025pht
Reference image from Aladin or Sloan Digital Sky Survey
Software used:TheSky6,CCDSoft 5, MSB Astroart 2.0, 8.0, Paint
Previous images chronological :
Pierre Ponsard on September 19, 2025 @ La Fosse Observatory (Belgium)
Photographer's website:
https://www.flickr.com/photos/odd_trondal/
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