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C/2021 A1 (Leonard)


NASA/JPL elements
IAU/MPC elements


On 2021 Nov 29 04h44 UT by Nicolas Biver


(Copyright Nicolas Biver)

Coma Total magnitude (m1)7.8
Aperture radius used for m14.5 '
Nuclear magnitude (m2)11.9
Aperture radius used for m26 "
Coma diameter9 '
Coma condensation degree (DC)5
Tail length0.5 °
Tail position angle (PA)315 °
r (dist/Sun) 0.961 AU
d (dist/Earth) 0.593 AU
Right ascension13 07 42.8 h m s
Declination+30 54 40 ° ' "
Instrumental configurationConfig1
InstrumentDobson T407
Instrument typeNewton
Instrument aperture (0=naked eye)407 mm
Instrument focale length1750 mm
Instrument focale/diameter4.29
Filter(s)None
CameraSony alpha7s
SensorDC
Sensor size36*24 mm2
Sensor pixels number4240*2832
Sensor temperature0 °C
Binning2x2
MountDobson sur table equatoriale JMI
MotorizationYes
AutoguideNo
Exposure total time46 s
Exposure details23*2s
Sky transparency (naked eye max mag)5.5
Seeing3
Moon phase148 °
Moon elongation31 °
Air mass1.4
Locationboulonville
Reference stars catalogAPASS
Used softwaresIRIS
Resulting picture sampling (scale)2 "/pix
Image processingbinning,V-50%,flat,alignements,somme, retrait gradient (RAW) (zone nucléaire non saturée)
Remarks or commentsCiel clair à cause de la lune. Couche V: mV=7.6 coma 9.5'
Observation submission date2021 Nov 30 18h31m25s

(Record n° 24476)

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