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3I/ATLAS


NASA/JPL elements
IAU/MPC elements


On 2025 Nov 18 05h34 UT by Nicolas Biver


(Copyright Nicolas Biver)

Coma Total magnitude (m1)9.9
Aperture radius used for m12.2 '
Nuclear magnitude (m2)12.4
Aperture radius used for m26 "
Coma diameter4.2 '
Coma condensation degree (DC)5
Afrho2600 cm
Afrho error120 cm
r (dist/Sun) 1.532 AU
d (dist/Earth) 2.071 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 temperature0 °C
Binning2x2
MountDobson sur table equatoriale JMI
MotorizationYes
AutoguideNo
Exposure total time87 s
Exposure details22x2+43x1s
Sky transparency (naked eye max mag)5.5
Seeing2
Moon phase158 °
Moon elongation24 °
Air mass2.5
LocationBoulonville
Reference stars catalogAPASS
Used softwaresIRIS
Resulting picture sampling (scale)2 "/pix
Image processingbinning, flat, alignement, somme, retrait gradient
Remarks or commentsAfrho sur couche R (maxi à moins de 15000km)
Observation submission date2025 Nov 19 14h11m25s
Observation modification date2025 Nov 19 14h16m42s

(Record n° 30414)

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