Occultation event with (884) Priamus, event index number 4237
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/09/14 07:55:43 UTC
J2000 position of star is 05:55:00.2 +29:25:06
Equinox of date position of star is 05:56:42.5 +29:25:16
Star is 122 degrees from the moon. Moon is 11% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 55% with SNR of 5.3 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 12.6 arcsec/hr.
Position angle of asteroid motion is 83.6 degrees
The recommended exposure time corresponds to 8.2 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 33.8 km.
The sky-plane scale is 4243.3 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, maximum of 7.6 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2026/09/14 07:56UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.1 +07:24:35 0.4 22.01 119 Alnath 05:27:58.9 +28:37:39 1.6 6.33 128 PPM 095117 05:58:15.6 +28:56:38 6.5 0.59 122 PPM 095081 05:57:11.2 +29:10:34 8.8 0.27 122 PPM 095084 05:57:14.9 +29:38:48 10.2 0.25 122 884_Priamus 05:56:42.5 +29:25:16 14.7 122 Positions are for equinox of date
Star training set for 884_Priamus, (2026/09/14 07:56UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 22.01 119 Alnath 05:26:17.6 +28:36:22 1.6 6.33 128 PPM 095117 05:56:33.8 +28:56:32 6.5 0.59 122 PPM 095081 05:55:29.2 +29:10:26 8.8 0.27 122 PPM 095084 05:55:32.5 +29:38:39 10.2 0.25 122 884_Priamus 05:55:00.2 +29:25:06 14.7 122 Positions are for J2000