Occultation event with (884) Priamus, event index number 1267
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/09/05 09:01:24 UTC
J2000 position of star is 03:59:01.4 +29:21:36
Equinox of date position of star is 04:00:37.1 +29:25:54
Star is 111 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 47% with SNR of 4.5 for the occulted depth (per occulted point)
Apparent velocity is 7.3 km/sec on the sky relative to the star, or, 6.8 arcsec/hr.
Position angle of asteroid motion is 51.0 degrees
The recommended exposure time corresponds to 4.8 km per image.
The 1-sigma error in the time of the event is 3.2 seconds.
The 1-sigma cross-track error in the shadow position is 22.4 km.
The sky-plane scale is 3892.5 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, aximum of 15.4 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 6.3 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2025/09/05 09:01UT) Object RA Dec mag sep mel Aldebaran 04:37:23.8 +16:33:32 0.8 15.39 117 44Zet Per 03:55:45.2 +31:57:28 2.8 2.73 111 PPM 068850 03:53:41.1 +31:14:37 6.3 2.35 110 PPM 093151 04:01:44.7 +29:46:54 8.3 0.43 112 PPM 093150 04:01:44.6 +29:39:07 9.0 0.33 112 PPM 093117 03:59:36.0 +29:26:12 11.9 0.22 111 884_Priamus 04:00:37.1 +29:25:54 14.5 112 Positions are for equinox of date
Star training set for 884_Priamus, (2025/09/05 09:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 15.39 117 44Zet Per 03:54:07.9 +31:53:01 2.8 2.73 111 PPM 068850 03:52:04.4 +31:10:06 6.3 2.35 110 PPM 093151 04:00:08.7 +29:42:39 8.3 0.43 112 PPM 093150 04:00:08.7 +29:34:52 9.0 0.33 112 PPM 093117 03:58:00.3 +29:21:52 11.9 0.22 111 884_Priamus 03:59:01.4 +29:21:36 14.5 111 Positions are for J2000