C/2023 H2 (Lemmon) (Record n° 27824)
NASA/JPL elements
IAU/MPC elements
On 2023 Nov 07 19h50 UT by Nicolas Biver
(Copyright Nicolas Biver)Coma Total magnitude (m1) 7.3 Aperture radius used for m1 7.5 ' Nuclear magnitude (m2) 12.9 Aperture radius used for m2 6 " Coma diameter 14 ' Coma condensation degree
(DC) 4 Tail length 0.4 ° Tail position angle
(PA) 35 ° Afrho 120 cm Afrho error 6 cm r (dist/Sun) 0.909 AU d (dist/Earth) 0.241 AU Instrumental configuration Config1 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 alpha7S Sensor DC Sensor size 36*24 mm2 Sensor pixels number 4240*2832 Sensor temperature 8 °C Binning 2x2 Mount dobson sur table equatoriale JMI Motorization Yes Autoguide No Exposure total time 89.2 s Exposure details 7x2+47x1.6s Sky transparency (naked eye max mag) 5 Seeing 3 Moon phase 90 ° Moon elongation 100 ° Air mass 2 Location Boulonville Reference stars catalog APASS Used softwares IRIS Resulting picture sampling (scale) 2 "/pix Image processing bininig, flat, alignement, alignement comète, somme, retrait gradient Remarks or comments photométrie sur les 41.6s en mode RAW
Afrho couche R, 35s RAW 2min plus tard (mêmes magnitudes) Observation submission date 2023 Nov 09 07h20m29s Observation modification date 2023 Nov 12 23h10m03s