C/2018 W2 (Africano) 2019-Jul-30 Nicolas Biver

Coma Total magnitude (m1) 11.6
Aperture radius used for m1 1.6 '
Nuclear magnitude (m2) 14.6
Aperture radius used for m2 6.0 "
Coma diameter 3.2 '
Coma condensation degree (DC) 4
r (dist/Sun) 1.550 AU
d (dist/Earth) 1.791 AU
Right ascension 04 27 24.7 h m s
Declination +59 05 10 ° ' "
Instrumental configuration Config1
Instrument Dobson T407mm 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
Binning 2x2
Mount Dobson sur table equatoriale JMI
Tracking Yes
Autoguide No
Exposure total time 93 s
Exposure details 6+29*3sec
Sky transparency (naked eye max mag) 6
Seeing 4
Moon phase 165 °
Air mass 1.5
Location Station de Valdrôme (26)
Reference stars catalog GSC (HST)
Photometry|Astrometry software IRIS
Resulting picture sampling (scale) 2 "/pix
Image processing alignement, somme, retrait gradient