Occultation event with (884) Priamus, event index number 4274
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/20 06:33:45 UTC
J2000 position of star is 05:57:05.3 +29:28:27
Equinox of date position of star is 05:58:47.6 +29:28:32
Star is 167 degrees from the moon. Moon is 63% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=14.7
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 12.1 km/sec on the sky relative to the star, or, 10.4 arcsec/hr.
Position angle of asteroid motion is 82.2 degrees
The recommended exposure time corresponds to 24.2 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 34.4 km.
The sky-plane scale is 4176.5 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, maximum of 9.3 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 3.8 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2026/09/20 06:34UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.2 +07:24:35 0.4 22.07 156 Alnath 05:27:59.0 +28:37:39 1.6 6.79 160 PPM 095117 05:58:15.7 +28:56:38 6.5 0.54 167 PPM 095161 06:00:06.6 +29:37:39 8.2 0.32 167 PPM 095116 05:58:13.4 +29:45:13 8.9 0.30 166 PPM 095158 05:59:56.9 +29:24:44 10.8 0.26 167 884_Priamus 05:58:47.6 +29:28:32 14.7 167 Positions are for equinox of date
Star training set for 884_Priamus, (2026/09/20 06:34UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 22.07 156 Alnath 05:26:17.6 +28:36:22 1.6 6.79 160 PPM 095117 05:56:33.8 +28:56:32 6.5 0.54 167 PPM 095161 05:58:24.1 +29:37:37 8.2 0.32 167 PPM 095116 05:56:30.8 +29:45:07 8.9 0.30 166 PPM 095158 05:58:14.6 +29:24:42 10.8 0.26 167 884_Priamus 05:57:05.3 +29:28:27 14.7 167 Positions are for J2000