Comet 21P/Giacobini-Zinner
Userjeff42
User`s namej-philippe remillieux
Observation's time (UT)2018-09-15 02:00
Toolorion equinox skywatcher
Observation's placeparc naturel régional du pilat
Magnitude7.8
Comparison stars sourceHJ - Magnitudes in the Hipparcos photometric system
MethodS - Sidgwick`s method
Coma diameter(')
Tail's lengthNot set
Condensation4
Positional angle of tailNot set
Bortl's scale5
Aperture80 mm
Focal length (mm)500
Type of toolR - Refractor
Magnification38.5
Field of view (°)1.77
SQM-L in zenith
Light pollution zoneYellow
Lm
Comment
Morris Format2018 Sep 15.08 UT: m1=7.8, DC=4 ...80-cm R (38.5x) ...j-philippe remillieux (parc naturel régional du pilat, france)