C/2021 A1 (Leonard) (Record n° 24476)
Perihelion distance : 0.61 AU
Inclination to ecliptic : 133 °
Eccentricity : 1
NASA/JPL elements
IAU/MPC elements
On 2021 Nov 29 04h44 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 7.8 Aperture radius for m1 4.5 ' Magnitude (MPC m2) 11.9 Aperture radius for m2 6 " Coma diameter 9 ' Coma condensation degree
(DC) 5 Tail length 0.5 ° Tail position angle
(PA) 315 ° r (dist/Sun) 0.961 AU d (dist/Earth) 0.593 AU Right ascension 196.92833 ° Declination +30.91111 ° Instrumental configuration Config1 Instrument Dobson T407 Instrument type Newton Instrument aperture (0=naked eye) 407 mm Instrument focale length 1750 mm Filter None Camera Sony alpha7s Sensor DC Sensor size 36*24 mm2 Sensor pixels number 4240*2832 Sensor temperature 0 °C Binning 2x2 Mount Dobson sur table equatoriale JMI Motorization Yes Autoguide No Exposure total time 46 s Exposure details 23*2s Sky transparency (naked eye max mag) 5.5 Seeing 3 Moon phase 148 ° Moon elongation 31 ° Air mass 1.4 Location boulonville Reference stars catalog (ast) APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing binning,V-50%,flat,alignements,somme, retrait gradient (RAW) (zone nucléaire non saturée) Remarks or comments Ciel clair à cause de la lune.
Couche V: mV=7.6 coma 9.5' Observation submission date 2021 Nov 30 18h31m25s