21P/Giacobini-Zinner (Record n° 19623)
Orbital period : 6.54 years
NASA/JPL elements
IAU/MPC elements
On 2018 Sep 03 03h30 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 7.8 Aperture radius used for m1 3.0 ' Nuclear magnitude (m2) 11.2 Aperture radius used for m2 6.0 " Coma diameter 6 ' Coma condensation degree
(DC) 5 Tail length 0.2 ° Tail position angle
(PA) 270 ° r (dist/Sun) 1.018 AU d (dist/Earth) 0.401 AU Right ascension 05 14 01.1 h m s Declination +45 02 00 ° ' " Instrumental configuration Config1 Instrument Dobson 407 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 4240x2832 Sensor temperature 11 °C Binning 2x2 Mount dobson Motorization No Autoguide No Exposure total time 11.5 s Exposure details 46x1/4s Sky transparency (naked eye max mag) 4.5 Seeing 2 Moon phase 90 ° Moon elongation 25 ° Air mass 1.5 Location Versailles Reference stars catalog GSC (HST) Used softwares IRIS Resulting picture sampling (scale) 2.0 "/pix Image processing alignement, somme, retrait gradient Remarks or comments m1=7.9 aux jumelles 7x50 Observation submission date 2018 Sep 05 15h16m59s