Occultation event with (884) Priamus, event index number 1501
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/11/12 21:13:14 UTC
J2000 position of star is 03:41:12.1 +29:29:30
Equinox of date position of star is 03:42:47.8 +29:34:24
Star is 89 degrees from the moon. Moon is 43% illuminated.
Stellar brightness G=13.0, apparent brightess of occulting body is G=13.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 67% with SNR of 6.6 for the occulted depth (per occulted point)
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 18.9 arcsec/hr.
Position angle of asteroid motion is 76.2 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.1 km.
The sky-plane scale is 3401.7 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, maximum of 6.3 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2025/11/12 21:13UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 18.06 79 44Zet Per 03:55:45.9 +31:57:30 2.8 3.67 85 38Omi Per 03:45:56.9 +32:22:05 3.7 2.88 87 PPM 092788 03:45:33.9 +29:45:47 8.4 0.63 88 PPM 092743 03:42:53.6 +29:35:12 9.0 0.03 88 884_Priamus 03:42:47.8 +29:34:24 13.8 88 Positions are for equinox of date
Star training set for 884_Priamus, (2025/11/12 21:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.06 79 44Zet Per 03:54:07.9 +31:53:01 2.8 3.67 85 38Omi Per 03:44:19.1 +32:17:17 3.7 2.88 87 PPM 092788 03:43:57.9 +29:40:59 8.4 0.63 88 PPM 092743 03:41:17.9 +29:30:19 9.0 0.03 88 884_Priamus 03:41:12.1 +29:29:30 13.8 89 Positions are for J2000