Occultation event with (4086) Podalirius, event index number 3985
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/11 09:34:44 UTC
J2000 position of star is 13:17:12.4 +02:57:34
Equinox of date position of star is 13:18:33.6 +02:49:11
Star is 76 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.8 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 28.0 km/sec on the sky relative to the star, or, 22.1 arcsec/hr.
Position angle of asteroid motion is 128.8 degrees
The recommended exposure time corresponds to 21.0 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 6.7 km.
The sky-plane scale is 4555.9 km/arcsec.
Diameter estimates:
83.6 km assuming a 5% albedo, maximum of 3.0 sec for a central chord
34.1 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 85.5 km used for deployment plan.
Star training set for 4086_Podalirius, (2026/08/11 09:35UT) Object RA Dec mag sep mel Spica 13:26:35.9 -11:17:58 1.0 14.26 83 Vindemiatrix 13:03:30.1 +10:49:00 2.8 8.83 69 PPM 159692 13:23:02.9 +01:56:53 5.7 1.42 77 PPM 159597 13:16:53.3 +02:54:31 8.4 0.43 75 PPM 159641 13:20:04.3 +02:49:12 10.5 0.38 76 4086_Podaliriu 13:18:33.6 +02:49:11 15.5 76 Positions are for equinox of date
Star training set for 4086_Podalirius, (2026/08/11 09:35UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 14.26 83 Vindemiatrix 13:02:10.1 +10:57:33 2.8 8.83 69 PPM 159692 13:21:41.5 +02:05:13 5.7 1.42 77 PPM 159597 13:15:32.0 +03:02:56 8.4 0.43 75 PPM 159641 13:18:43.1 +02:57:34 10.5 0.38 76 4086_Podaliriu 13:17:12.4 +02:57:34 15.5 76 Positions are for J2000