Occultation event with (884) Priamus, event index number 1350
Regions able to see the event: NMexico
Geocentric closest approach at 2025/10/09 12:22:57 UTC
J2000 position of star is 03:56:50.3 +29:56:39
Equinox of date position of star is 03:58:26.6 +30:01:02
Star is 14 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 30% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 9.3 km/sec on the sky relative to the star, or, 9.4 arcsec/hr.
Position angle of asteroid motion is 93.4 degrees
The recommended exposure time corresponds to 13.9 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 31.9 km.
The sky-plane scale is 3566.1 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, aximum of 12.2 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 5.0 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2025/10/09 12:23UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 16.14 23 44Zet Per 03:55:45.5 +31:57:29 2.8 2.02 15 PPM 068850 03:53:41.4 +31:14:38 6.3 1.60 14 PPM 093151 04:01:45.1 +29:46:55 8.3 0.75 15 PPM 068983 04:01:34.3 +30:30:10 9.6 0.83 15 PPM 068939 03:59:04.2 +30:04:41 10.2 0.15 15 884_Priamus 03:58:26.6 +30:01:02 14.2 15 Positions are for equinox of date
Star training set for 884_Priamus, (2025/10/09 12:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 16.14 23 44Zet Per 03:54:07.9 +31:53:01 2.8 2.02 15 PPM 068850 03:52:04.4 +31:10:06 6.3 1.60 14 PPM 093151 04:00:08.7 +29:42:39 8.3 0.75 15 PPM 068983 03:59:57.4 +30:25:53 9.6 0.83 15 PPM 068939 03:57:27.7 +30:00:19 10.2 0.15 15 884_Priamus 03:56:50.3 +29:56:39 14.2 14 Positions are for J2000