C/2021 A1 (Leonard) (Record n° 24179)
NASA/JPL elements
IAU/MPC elements
On 2021 Oct 14 03h55 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 12.2 Aperture radius used for m1 1.2 ' Nuclear magnitude (m2) 14.8 Aperture radius used for m2 6 " Coma diameter 2 ' Coma condensation degree
(DC) 5 Tail length 0.05 ° Tail position angle
(PA) 340 ° r (dist/Sun) 1.665 AU d (dist/Earth) 2.105 AU Right ascension 11 30 57.1 h m s Declination +36 23 51 ° ' " Instrumental configuration Config1 Instrument Dobson 407mm F/D 4.3 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 alpha 7s Sensor DC Sensor size 36*24 mm2 Sensor pixels number 4240*2832 Sensor temperature 3 °C Binning 2x2 Mount Dobson sur table equatoriale JMI Motorization Yes Autoguide No Exposure total time 104.5 s Exposure details 10*2s+20*1.6s+21*2.5s Sky transparency (naked eye max mag) 5.5 Seeing 2 Moon phase 90 ° Moon elongation 180 ° Air mass 2.3 Location Boulonville Reference stars catalog APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing binning,flat,alignement,somme, retrait gradient Observation submission date 2021 Oct 15 18h54m13s