Occultation event with (15663) Periphas, event index number 3428
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/03/14 23:07:44 UTC
J2000 position of star is 12:44:33.3 -00:57:42
Equinox of date position of star is 12:45:54.0 -01:06:17
Star is 114 degrees from the moon. Moon is 18% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 89% with SNR of 7.8 for the occulted depth (per occulted point)
Apparent velocity is 19.7 km/sec on the sky relative to the star, or, 20.8 arcsec/hr.
Position angle of asteroid motion is 94.9 degrees
The recommended exposure time corresponds to 3.9 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 15.7 km.
The sky-plane scale is 3413.3 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, (2026/03/14 23:08UT) Object RA Dec mag sep mel Spica 13:26:34.6 -11:17:50 1.0 14.35 100 Vindemiatrix 13:03:28.9 +10:49:08 2.8 12.70 114 38 Vir 12:54:31.8 -03:41:42 6.1 3.37 111 PPM 178863 12:44:59.0 -01:43:15 6.8 0.66 114 PPM 178876 12:47:53.0 -00:57:52 8.9 0.52 113 PPM 178866 12:45:16.7 -01:13:15 11.5 0.19 114 15663_Periphas 12:45:54.0 -01:06:17 16.1 113 Positions are for equinox of date
Star training set for 15663_Periphas, (2026/03/14 23:08UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 14.35 100 Vindemiatrix 13:02:10.1 +10:57:33 2.8 12.70 114 38 Vir 12:53:10.7 -03:33:11 6.1 3.37 111 PPM 178863 12:43:38.2 -01:34:40 6.8 0.66 114 PPM 178876 12:46:32.4 -00:49:18 8.9 0.52 113 PPM 178866 12:43:56.0 -01:04:40 11.5 0.19 114 15663_Periphas 12:44:33.3 -00:57:42 16.1 114 Positions are for J2000