Occultation event with (884) Priamus, event index number 1519
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/15 11:23:07 UTC
J2000 position of star is 03:39:44.2 +29:24:39
Equinox of date position of star is 03:41:19.8 +29:29:36
Star is 121 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=13.8
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.2 for the occulted depth (per occulted point)
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 19.2 arcsec/hr.
Position angle of asteroid motion is 75.3 degrees
The recommended exposure time corresponds to 30.8 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 3399.0 km/arcsec.
Diameter estimates:
112.7 km assuming a 5% albedo, aximum of 6.2 sec for a central chord
46.0 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 101.1 km used for deployment plan.
Star training set for 884_Priamus, (2025/11/15 11:23UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 18.24 111 44Zet Per 03:55:45.9 +31:57:30 2.8 3.96 117 38Omi Per 03:45:56.9 +32:22:05 3.7 3.04 119 PPM 092661 03:38:15.3 +29:18:28 7.0 0.69 122 PPM 092724 03:41:56.3 +29:37:59 10.0 0.19 121 884_Priamus 03:41:19.8 +29:29:36 13.8 121 Positions are for equinox of date
Star training set for 884_Priamus, (2025/11/15 11:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.24 111 44Zet Per 03:54:07.9 +31:53:01 2.8 3.96 117 38Omi Per 03:44:19.1 +32:17:17 3.7 3.04 119 PPM 092661 03:36:40.0 +29:13:26 7.0 0.69 122 PPM 092724 03:40:20.6 +29:33:03 10.0 0.19 121 884_Priamus 03:39:44.2 +29:24:39 13.8 121 Positions are for J2000