C/2021 A1 (Leonard) (Record n° 24650)
NASA/JPL elements
IAU/MPC elements
On 2021 Dec 18 16h56 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 4.6 Aperture radius used for m1 1.3 ' Nuclear magnitude (m2) 7.9 Aperture radius used for m2 6 " Coma condensation degree
(DC) 6 r (dist/Sun) 0.709 AU d (dist/Earth) 0.324 AU Right ascension 19 50 00.0 h m s Declination -27 00 00 ° ' " Instrumental configuration Config2 Instrument Dobson 256mm F/D 4.97 Instrument type Newton Instrument aperture (0=naked eye) 256 mm Instrument focale length 1267 mm Instrument focale/diameter 4.94 Filter(s) None Camera SONY alpha7S Sensor DC Sensor size 36*24 mm2 Sensor pixels number 4240*2832 Sensor temperature 8 °C Binning 2x2 Mount Dobson Motorization No Autoguide No Exposure total time 3.42 s Exposure details 38/25s+19/10s Sky transparency (naked eye max mag) 2 Seeing 4 Moon phase 0 ° Moon elongation 160 ° Air mass 14 Location Versailles Reference stars catalog Tycho Resulting picture sampling (scale) 2.77 "/pix Image processing images raw: Binning, flat,alignements 2 groupes, alignement somme, retrait gradient Observation submission date 2021 Dec 20 18h16m52s