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C/2021 A1 (Leonard)


NASA/JPL elements
IAU/MPC elements


On 2021 Oct 09 04h38 UT by Nicolas Biver


(Copyright Nicolas Biver)

Coma Total magnitude (m1)12.4
Aperture radius used for m11.4 '
Nuclear magnitude (m2)15.4
Aperture radius used for m26 "
Coma diameter1.5 '
Coma condensation degree (DC)3
Tail length0.07 °
Tail position angle (PA)340 °
r (dist/Sun) 1.740 AU
d (dist/Earth) 2.240 AU
Right ascension11 26 16.0 h m s
Declination+36 52 43 ° ' "
Instrumental configurationConfig1
InstrumentDobson T407mm
Instrument typeNewton
Instrument aperture (0=naked eye)407 mm
Instrument focale length1750 mm
Instrument focale/diameter4.29
Filter(s)None
CameraSony alpha 7s
SensorDC
Sensor size36x24 mm2
Sensor pixels number4240x2832
Sensor temperature8 °C
Binning2x2
MountDobson
MotorizationNo
AutoguideNo
Exposure total time27.8 s
Exposure details31*1/3+35*1/2s
Sky transparency (naked eye max mag)5.5
Seeing3
Moon phase160 °
Moon elongation180 °
Air mass1.9
LocationBoulonville
Reference stars catalogAPASS
Used softwaresIRIS
Resulting picture sampling (scale)2 "/pix
Image processingbinning,flat,alignement,somme
Remarks or commentsMagnitude englobant sans dout un peu la queue: m1=12.9 sur 1.5' de diamètre (coma 2' visuel m1~11.7)
Observation submission date2021 Oct 11 11h31m00s

(Record n° 24136)

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