Occultation event with (3317) Paris, event index number 3998
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/13 20:09:33 UTC
J2000 position of star is 05:44:08.2 +00:54:26
Equinox of date position of star is 05:45:30.7 +00:55:01
Star is 71 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.7 per integration for unocculted signal
Expected flux drop is 84% with SNR of 10.7 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 22.4 arcsec/hr.
Position angle of asteroid motion is 100.2 degrees
The recommended exposure time corresponds to 3.4 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 34.2 km.
The sky-plane scale is 4518.0 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, maximum of 4.5 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, (2026/08/13 20:10UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 7.06 68 34Del Ori 05:33:22.1 -00:16:54 2.2 3.26 75 51 Ori 05:43:51.3 +01:29:07 4.9 0.70 72 PPM 149355 05:44:22.2 +01:30:09 8.3 0.65 72 PPM 149385 05:45:34.8 +00:58:05 8.6 0.05 71 3317_Paris 05:45:30.7 +00:55:01 14.6 71 Positions are for equinox of date
Star training set for 3317_Paris, (2026/08/13 20:10UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.06 68 34Del Ori 05:32:00.4 -00:17:57 2.2 3.26 75 51 Ori 05:42:28.5 +01:28:28 4.9 0.70 72 PPM 149355 05:42:59.4 +01:29:31 8.3 0.65 72 PPM 149385 05:44:12.4 +00:57:30 8.6 0.05 71 3317_Paris 05:44:08.2 +00:54:26 14.6 71 Positions are for J2000