Occultation event with (884) Priamus, event index number 4064
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/21 04:03:08 UTC
J2000 position of star is 05:42:50.5 +29:11:04
Equinox of date position of star is 05:44:32.3 +29:11:42
Star is 164 degrees from the moon. Moon is 60% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 17% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 25.1 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
Position angle of asteroid motion is 85.6 degrees
The recommended exposure time corresponds to 31.3 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 34.5 km.
The sky-plane scale is 4500.2 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, maximum of 4.5 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2026/08/21 04:03UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 19.92 169 Alnath 05:27:58.7 +28:37:39 1.6 3.67 167 PPM 094619 05:41:00.0 +29:13:41 5.9 0.77 164 PPM 094743 05:45:04.5 +29:12:37 7.8 0.12 163 884_Priamus 05:44:32.3 +29:11:42 14.8 163 Positions are for equinox of date
Star training set for 884_Priamus, (2026/08/21 04:03UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.92 169 Alnath 05:26:17.6 +28:36:22 1.6 3.67 167 PPM 094619 05:39:18.3 +29:12:54 5.9 0.77 164 PPM 094743 05:43:22.8 +29:12:00 7.8 0.12 163 884_Priamus 05:42:50.5 +29:11:04 14.8 164 Positions are for J2000