Occultation event with (5283) Pyrrhus, event index number 3565
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2026/04/01 15:15:50 UTC
J2000 position of star is 12:58:17.3 +14:29:49
Equinox of date position of star is 12:59:35.8 +14:21:21
Star is 22 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 20% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 106.7 degrees
The recommended exposure time corresponds to 18.6 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 25.3 km.
The sky-plane scale is 3279.5 km/arcsec.
Diameter estimates:
66.7 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
27.2 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 48.4 km used for deployment plan.
Star training set for 5283_Pyrrhus, (2026/04/01 15:16UT) Object RA Dec mag sep mel Arcturus 14:16:51.6 +19:02:50 0.0 19.07 37 Vindemiatrix 13:03:29.0 +10:49:07 2.8 3.66 19 PPM 129407 12:53:45.7 +15:58:48 6.3 2.15 22 PPM 129576 13:06:46.3 +14:35:07 8.3 1.75 23 PPM 129487 13:00:28.7 +14:45:21 9.5 0.45 22 PPM 129491 13:00:35.8 +14:18:32 11.0 0.25 22 5283_Pyrrhus 12:59:35.8 +14:21:21 14.9 22 Positions are for equinox of date
Star training set for 5283_Pyrrhus, (2026/04/01 15:16UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 19.07 37 Vindemiatrix 13:02:10.1 +10:57:33 2.8 3.66 19 PPM 129407 12:52:27.3 +16:07:20 6.3 2.15 22 PPM 129576 13:05:28.2 +14:43:31 8.3 1.75 23 PPM 129487 12:59:10.4 +14:53:50 9.5 0.45 22 PPM 129491 12:59:17.5 +14:27:00 11.0 0.25 22 5283_Pyrrhus 12:58:17.3 +14:29:49 14.9 22 Positions are for J2000