Occultation event with (3317) Paris, event index number 4145
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/01 05:36:32 UTC
J2000 position of star is 05:53:46.1 +00:18:04
Equinox of date position of star is 05:55:08.3 +00:18:17
Star is 64 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 5.0 per integration for unocculted signal
Expected flux drop is 22% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 21.7 km/sec on the sky relative to the star, or, 17.9 arcsec/hr.
Position angle of asteroid motion is 108.9 degrees
The recommended exposure time corresponds to 29.3 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 34.7 km.
The sky-plane scale is 4352.8 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, maximum of 5.8 sec for a central chord
51.2 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 118.8 km used for deployment plan.
Star training set for 3317_Paris, (2026/09/01 05:37UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.0 +07:24:35 0.4 7.11 63 34Del Ori 05:33:22.2 -00:16:53 2.2 5.47 59 60 Ori 06:00:11.9 +00:33:12 5.2 1.29 66 PPM 149635 05:56:06.6 +00:58:17 7.6 0.71 64 PPM 149588 05:54:17.5 +00:10:05 9.6 0.25 64 3317_Paris 05:55:08.3 +00:18:17 14.5 65 Positions are for equinox of date
Star training set for 3317_Paris, (2026/09/01 05:37UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.11 63 34Del Ori 05:32:00.4 -00:17:57 2.2 5.47 59 60 Ori 05:58:49.6 +00:33:11 5.2 1.29 66 PPM 149635 05:54:44.0 +00:58:07 7.6 0.71 64 PPM 149588 05:52:55.4 +00:09:50 9.6 0.25 64 3317_Paris 05:53:46.1 +00:18:04 14.5 64 Positions are for J2000