Occultation event with (7543) Prylis, event index number 3209
Regions able to see the event: SAmericaN,SAmericaS,NMexico,SMexico
Geocentric closest approach at 2026/02/04 06:19:21 UTC
J2000 position of star is 12:59:11.5 -08:38:36
Equinox of date position of star is 13:00:33.1 -08:47:01
Star is 32 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.2
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 8.7 per integration for unocculted signal
Expected flux drop is 60% with SNR of 5.2 for the occulted depth (per occulted point)
Apparent velocity is 3.0 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
Position angle of asteroid motion is 155.6 degrees
The recommended exposure time corresponds to 6.0 km per image.
The 1-sigma error in the time of the event is 11.8 seconds.
The 1-sigma cross-track error in the shadow position is 10.2 km.
The sky-plane scale is 3580.9 km/arcsec.
Diameter estimates:
44.5 km assuming a 5% albedo, maximum of 14.8 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 6.0 sec for a central chord
Cross-track diameter of 42.9 km used for deployment plan.
Star training set for 7543_Prylis, (2026/02/04 06:19UT) Object RA Dec mag sep mel Spica 13:26:34.3 -11:17:48 1.0 6.88 39 40Psi Vir 12:55:42.8 -09:40:49 4.8 1.49 31 PPM 196025 13:00:21.0 -08:52:47 7.5 0.11 32 PPM 196029 13:00:32.3 -08:41:56 9.1 0.08 32 7543_Prylis 13:00:33.1 -08:47:01 16.2 32 Positions are for equinox of date
Star training set for 7543_Prylis, (2026/02/04 06:19UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 6.88 39 40Psi Vir 12:54:21.1 -09:32:21 4.8 1.49 31 PPM 196025 12:58:59.3 -08:44:22 7.5 0.11 32 PPM 196029 12:59:10.7 -08:33:31 9.1 0.08 32 7543_Prylis 12:59:11.5 -08:38:36 16.2 32 Positions are for J2000