C/2019 Y4 (ATLAS) (Record n° 21946)
Orbital period : 5870.00 years
NASA/JPL elements
IAU/MPC elements
On 2020 Apr 22 20h55 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 10.2 Aperture radius used for m1 2.5 ' Nuclear magnitude (m2) 15.1 Aperture radius used for m2 6 " Coma diameter 4.5 ' Coma condensation degree
(DC) 1 r (dist/Sun) 1.069 AU d (dist/Earth) 0.970 AU Right ascension 05 50 18.3 h m s Declination +63 27 13 ° ' " Instrumental configuration Config2 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 36x24 mm2 Sensor pixels number 4240x2438 Sensor temperature 18 °C Binning 2x2 Mount Dobson seule Motorization No Autoguide No Exposure total time 27.8 s Exposure details 34x0.5+31*1/3s Sky transparency (naked eye max mag) 4.5 Air mass 1.4 Location Versailles Reference stars catalog APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing Division flat, alignement, somme, retrait gradient résiduel +-bon à cause des lumières parasites Remarks or comments mR=11.3, mV=9.8, mB=10.0
coma 5.5x3.5' Observation submission date 2020 Apr 29 21h10m44s