C/2021 A1 (Leonard) (Record n° 24136)
NASA/JPL elements
IAU/MPC elements
On 2021 Oct 09 04h38 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 12.4 Aperture radius used for m1 1.4 ' Nuclear magnitude (m2) 15.4 Aperture radius used for m2 6 " Coma diameter 1.5 ' Coma condensation degree
(DC) 3 Tail length 0.07 ° Tail position angle
(PA) 340 ° r (dist/Sun) 1.740 AU d (dist/Earth) 2.240 AU Right ascension 11 26 16.0 h m s Declination +36 52 43 ° ' " 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 alpha 7s Sensor DC Sensor size 36x24 mm2 Sensor pixels number 4240x2832 Sensor temperature 8 °C Binning 2x2 Mount Dobson Motorization No Autoguide No Exposure total time 27.8 s Exposure details 31*1/3+35*1/2s Sky transparency (naked eye max mag) 5.5 Seeing 3 Moon phase 160 ° Moon elongation 180 ° Air mass 1.9 Location Boulonville Reference stars catalog APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing binning,flat,alignement,somme Remarks or comments Magnitude englobant sans dout un peu la queue: m1=12.9 sur 1.5' de diamètre
(coma 2' visuel m1~11.7) Observation submission date 2021 Oct 11 11h31m00s