21P/Giacobini-Zinner (Record n° 19315)
Orbital period : 6.54 years
NASA/JPL elements
IAU/MPC elements
On 2018 Jul 08 23h23 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 11.2 Aperture radius used for m1 1 ' Nuclear magnitude (m2) 13.6 Aperture radius used for m2 4 " Coma diameter 2 ' Coma condensation degree
(DC) 5 r (dist/Sun) 1.348 AU d (dist/Earth) 0.787 AU Right ascension 21 52 13.4 h m s Declination +54 41 05.0 ° ' " 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 Binning 2x2 Mount dobson Motorization No Autoguide No Exposure total time 20 s Exposure details 60x1/3s Sky transparency (naked eye max mag) 4.5 Seeing 2 Moon phase 123 ° Air mass 1.1 Location Versailles Reference stars catalog GSC (HST) Used softwares IRIS Resulting picture sampling (scale) 2.0 "/pix Image processing alignement, somme, retrait gradient Observation submission date 2018 Jul 09 14h49m51s