Occultation event with (3317) Paris, event index number 3991
Regions able to see the event: SMexico
Geocentric closest approach at 2026/08/12 11:37:29 UTC
J2000 position of star is 05:43:20.0 +00:56:32
Equinox of date position of star is 05:44:42.4 +00:57:10
Star is 55 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 64% with SNR of 6.3 for the occulted depth (per occulted point)
Apparent velocity is 28.6 km/sec on the sky relative to the star, or, 22.7 arcsec/hr.
Position angle of asteroid motion is 99.7 degrees
The recommended exposure time corresponds to 8.6 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 35.1 km.
The sky-plane scale is 4529.1 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
51.2 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 118.8 km used for deployment plan.
Star training set for 3317_Paris, (2026/08/12 11:37UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 7.11 50 34Del Ori 05:33:22.1 -00:16:54 2.2 3.09 58 51 Ori 05:43:51.3 +01:29:07 4.9 0.57 55 PPM 149355 05:44:22.2 +01:30:09 8.3 0.56 55 PPM 149376 05:45:10.6 +01:03:50 8.8 0.16 55 3317_Paris 05:44:42.4 +00:57:10 14.6 55 Positions are for equinox of date
Star training set for 3317_Paris, (2026/08/12 11:37UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.11 50 34Del Ori 05:32:00.4 -00:17:57 2.2 3.09 58 51 Ori 05:42:28.5 +01:28:28 4.9 0.57 55 PPM 149355 05:42:59.4 +01:29:31 8.3 0.56 55 PPM 149376 05:43:48.1 +01:03:14 8.8 0.16 55 3317_Paris 05:43:20.0 +00:56:32 14.6 55 Positions are for J2000