Occultation event with (15663) Periphas, event index number 3630
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/14 12:02:24 UTC
J2000 position of star is 12:26:52.1 -00:37:00
Equinox of date position of star is 12:28:13.0 -00:45:43
Star is 158 degrees from the moon. Moon is 11% illuminated.
Stellar brightness G=12.5, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 16.1 per integration for unocculted signal
Expected flux drop is 97% with SNR of 15.6 for the occulted depth (per occulted point)
Apparent velocity is 19.8 km/sec on the sky relative to the star, or, 20.8 arcsec/hr.
Position angle of asteroid motion is 92.8 degrees
The recommended exposure time corresponds to 2.4 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 16.4 km.
The sky-plane scale is 3418.7 km/arcsec.
Diameter estimates:
40.7 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 36.2 km used for deployment plan.
Star training set for 15663_Periphas, (2026/04/14 12:02UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 17.91 141 Vindemiatrix 13:03:29.1 +10:49:06 2.8 14.53 150 15Eta Vir 12:21:15.1 -00:48:46 3.9 1.74 160 PPM 178782 12:27:01.3 -00:25:39 8.4 0.45 159 PPM 178787 12:28:01.2 -01:04:00 10.6 0.31 158 15663_Periphas 12:28:13.0 -00:45:43 16.1 158 Positions are for equinox of date
Star training set for 15663_Periphas, (2026/04/14 12:02UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 17.91 141 Vindemiatrix 13:02:10.1 +10:57:33 2.8 14.53 150 15Eta Vir 12:19:54.3 -00:40:01 3.9 1.74 160 PPM 178782 12:25:40.4 -00:16:55 8.4 0.45 159 PPM 178787 12:26:40.3 -00:55:17 10.6 0.31 158 15663_Periphas 12:26:52.1 -00:37:00 16.1 158 Positions are for J2000