Occultation event with (4086) Podalirius, event index number 3617
Regions able to see the event: SMexico
Geocentric closest approach at 2026/04/12 05:09:09 UTC
J2000 position of star is 13:25:54.0 +08:41:47
Equinox of date position of star is 13:27:12.8 +08:33:37
Star is 118 degrees from the moon. Moon is 31% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 15% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 18.8 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 100.1 degrees
The recommended exposure time corresponds to 25.4 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 22.7 km.
The sky-plane scale is 3478.9 km/arcsec.
Diameter estimates:
83.6 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
34.1 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 85.5 km used for deployment plan.
Star training set for 4086_Podalirius, (2026/04/12 05:09UT) Object RA Dec mag sep mel Arcturus 14:16:51.7 +19:02:50 0.0 15.96 109 Vindemiatrix 13:03:29.1 +10:49:06 2.8 6.27 124 PPM 159803 13:31:19.2 +07:02:38 6.2 1.83 117 PPM 159775 13:29:27.8 +08:13:22 8.4 0.65 117 PPM 159749 13:27:42.5 +08:46:20 9.9 0.24 118 4086_Podaliriu 13:27:12.8 +08:33:37 14.6 118 Positions are for equinox of date
Star training set for 4086_Podalirius, (2026/04/12 05:09UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 15.96 109 Vindemiatrix 13:02:10.1 +10:57:33 2.8 6.27 124 PPM 159803 13:30:00.1 +07:10:44 6.2 1.83 117 PPM 159775 13:28:08.9 +08:21:30 8.4 0.65 117 PPM 159749 13:26:23.8 +08:54:29 9.9 0.24 118 4086_Podaliriu 13:25:54.0 +08:41:47 14.6 118 Positions are for J2000