Occultation event with (3317) Paris, event index number 4439
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/20 00:48:44 UTC
J2000 position of star is 06:04:02.5 -01:58:17
Equinox of date position of star is 06:05:23.7 -01:58:28
Star is 133 degrees from the moon. Moon is 63% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=14.3
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 5.6 per integration for unocculted signal
Expected flux drop is 17% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 7.9 km/sec on the sky relative to the star, or, 7.4 arcsec/hr.
Position angle of asteroid motion is 18.3 degrees
The recommended exposure time corresponds to 15.8 km per image.
The 1-sigma error in the time of the event is 4.4 seconds.
The 1-sigma cross-track error in the shadow position is 1.5 km.
The sky-plane scale is 3868.9 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, maximum of 15.9 sec for a central chord
51.2 km assuming a 30% albedo, maximum of 6.5 sec for a central chord
Cross-track diameter of 118.8 km used for deployment plan.
Star training set for 3317_Paris, (2026/10/20 00:49UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.4 +07:24:35 0.4 9.64 134 34Del Ori 05:33:22.6 -00:16:53 2.2 8.18 126 PPM 188676 06:01:23.9 -03:04:31 4.7 1.49 131 PPM 188741 06:04:39.9 -02:28:52 7.7 0.54 132 PPM 176107 06:04:31.4 -02:04:19 9.0 0.24 132 3317_Paris 06:05:23.7 -01:58:28 14.3 133 Positions are for equinox of date
Star training set for 3317_Paris, (2026/10/20 00:49UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.64 134 34Del Ori 05:32:00.4 -00:17:57 2.2 8.18 126 PPM 188676 06:00:03.4 -03:04:29 4.7 1.49 131 PPM 188741 06:03:19.1 -02:28:43 7.7 0.54 132 PPM 176107 06:03:10.3 -02:04:10 9.0 0.24 132 3317_Paris 06:04:02.5 -01:58:17 14.3 133 Positions are for J2000