Occultation event with (7543) Prylis, event index number 3595
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/07 22:36:36 UTC
J2000 position of star is 12:39:29.1 -05:19:06
Equinox of date position of star is 12:40:50.5 -05:27:44
Star is 72 degrees from the moon. Moon is 71% illuminated.
Stellar brightness G=13.4, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.15 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 88% with SNR of 8.8 for the occulted depth (per occulted point)
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 122.9 degrees
The recommended exposure time corresponds to 2.7 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 27.7 km.
The sky-plane scale is 3258.4 km/arcsec.
Diameter estimates:
44.5 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 42.9 km used for deployment plan.
Star training set for 7543_Prylis, (2026/04/07 22:37UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 12.72 59 25 Vir 12:38:08.7 -05:58:35 5.9 0.85 73 PPM 195749 12:43:20.9 -05:21:53 8.3 0.63 72 PPM 195683 12:40:06.2 -05:28:21 8.7 0.18 72 7543_Prylis 12:40:50.5 -05:27:44 15.6 72 Positions are for equinox of date
Star training set for 7543_Prylis, (2026/04/07 22:37UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 12.72 59 25 Vir 12:36:47.3 -05:49:55 5.9 0.85 73 PPM 195749 12:41:59.5 -05:13:16 8.3 0.63 72 PPM 195683 12:38:44.9 -05:19:43 8.7 0.18 72 7543_Prylis 12:39:29.1 -05:19:06 15.6 72 Positions are for J2000