3I/ATLAS (Record n° 30635)
NASA/JPL elements
IAU/MPC elements
On 2025 Dec 11 04h30 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 11.0 Aperture radius used for m1 1.2 ' Nuclear magnitude (m2) 13.6 Aperture radius used for m2 6 " Coma diameter 2.2 ' Coma condensation degree
(DC) 5 r (dist/Sun) 2.056 AU d (dist/Earth) 1.824 AU Instrumental configuration Config1 Instrument Dobson T407mm Instrument type Newton Instrument aperture (0=naked eye) 407 mm Instrument focale length 1750 mm Instrument focale/diameter 4.29 Filter(s) None Camera Sony alpha7s Sensor DC Sensor size 36x24 mm2 Sensor pixels number 4240x2832 Sensor temperature 5 °C Binning 2x2 Mount Dobson Motorization No Autoguide No Exposure total time 36.3 s Exposure details 34x1/3+100x1/4s Sky transparency (naked eye max mag) 4.5 Seeing 2 Moon phase 52 ° Moon elongation 8 ° Air mass 1.5 Location Versailles Reference stars catalog APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing binning,flat,alignement,sommes,alignement cométaire, somme, retrait gradient Observation submission date 2025 Dec 14 19h20m58s