Occultation event with (15539) 00CN3, event index number 3739
Regions able to see the event: Europe
Geocentric closest approach at 2026/05/11 20:15:06 UTC
J2000 position of star is 09:28:47.4 +33:33:34
Equinox of date position of star is 09:30:22.6 +33:26:35
Star is 145 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=13.1, 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 10.1 per integration for unocculted signal
Expected flux drop is 94% with SNR of 9.5 for the occulted depth (per occulted point)
Apparent velocity is 15.4 km/sec on the sky relative to the star, or, 14.8 arcsec/hr.
Position angle of asteroid motion is 121.2 degrees
The recommended exposure time corresponds to 1.8 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 34.3 km.
The sky-plane scale is 3732.8 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 42.2 km used for deployment plan.
Star training set for 15539_00CN3, (2026/05/11 20:15UT) Object RA Dec mag sep mel Pollux 07:46:55.5 +27:57:37 1.1 22.84 128 40Alp Lyn 09:22:39.2 +34:16:46 3.1 1.81 143 PPM 074549 09:31:37.1 +33:11:20 8.5 0.36 145 PPM 074545 09:31:30.7 +33:26:05 8.7 0.24 145 PPM 074538 09:30:56.8 +33:21:35 10.1 0.15 145 15539_00CN3 09:30:22.6 +33:26:35 16.1 145 Positions are for equinox of date
Star training set for 15539_00CN3, (2026/05/11 20:15UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 22.84 128 40Alp Lyn 09:21:02.9 +34:23:34 3.1 1.81 143 PPM 074549 09:30:02.1 +33:18:20 8.5 0.36 145 PPM 074545 09:29:55.5 +33:33:05 8.7 0.24 145 PPM 074538 09:29:21.6 +33:28:35 10.1 0.15 145 15539_00CN3 09:28:47.4 +33:33:34 16.1 145 Positions are for J2000