3I/ATLAS (Record n° 29921)
NASA/JPL elements
IAU/MPC elements
On 2025 Aug 16 20h47 UT by Eric Tessier
(Copyright Eric Tessier)Coma Total magnitude (m1) 15.9 Aperture radius used for m1 0.2 ' Nuclear magnitude (m2) 16.2 Aperture radius used for m2 6.8 " Coma diameter 0.2 ' r (dist/Sun) 3.010 AU d (dist/Earth) 2.654 AU Right ascension 16 08 13.51 h m s Declination +16 07 55.3 ° ' " Instrument SW ED120 Instrument type Refractor Instrument aperture (0=naked eye) 120 mm Instrument focale length 765 mm Instrument focale/diameter 6.37 Filter(s) None Camera ATIK 314L+ Sensor CCD Sensor temperature -10 °C Binning 1x1 Mount Sphinx Motorization Yes Autoguide No Exposure details 24x30s Sky transparency (naked eye max mag) 6 Seeing 2 Moon phase 90 ° Air mass 3.3 Location Yonne (89) Reference stars catalog Gaia DR1 Used softwares IRIS Resulting picture sampling (scale) 1.7 "/pix Remarks or comments photométrie basée sur Gmag=15.57 de la source DR3 : 6250542979061043000 Observation submission date 2025 Aug 17 16h37m22s Observation modification date 2025 Aug 19 15h24m20s