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3I/ATLAS


NASA/JPL elements
IAU/MPC elements


On 2025 Dec 11 04h30 UT by Nicolas Biver


(Copyright Nicolas Biver)

Coma Total magnitude (m1)11.0
Aperture radius used for m11.2 '
Nuclear magnitude (m2)13.6
Aperture radius used for m26 "
Coma diameter2.2 '
Coma condensation degree (DC)5
r (dist/Sun) 2.056 AU
d (dist/Earth) 1.824 AU
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 alpha7s
SensorDC
Sensor size36x24 mm2
Sensor pixels number4240x2832
Sensor temperature5 °C
Binning2x2
MountDobson
MotorizationNo
AutoguideNo
Exposure total time36.3 s
Exposure details34x1/3+100x1/4s
Sky transparency (naked eye max mag)4.5
Seeing2
Moon phase52 °
Moon elongation8 °
Air mass1.5
LocationVersailles
Reference stars catalogAPASS
Used softwaresIRIS
Resulting picture sampling (scale)2 "/pix
Image processingbinning,flat,alignement,sommes,alignement cométaire, somme, retrait gradient
Observation submission date2025 Dec 14 19h20m58s

(Record n° 30635)

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