Occultation event with (4835) Asaeus, event index number 1158
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/22 10:31:33 UTC
J2000 position of star is 11:51:18.1 +16:59:04
Equinox of date position of star is 11:52:37.0 +16:50:32
Star is 81 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 45% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 33.4 km/sec on the sky relative to the star, or, 33.9 arcsec/hr.
Position angle of asteroid motion is 331.3 degrees
The recommended exposure time corresponds to 18.3 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 26.3 km.
The sky-plane scale is 3546.0 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 45.5 km used for deployment plan.
Star training set for 4835_Asaeus, (2025/07/22 10:32UT) Object RA Dec mag sep mel Regulus 10:09:43.8 +11:50:29 1.3 25.39 61 Denebola 11:50:21.7 +14:25:45 2.1 2.47 82 PPM 128581 11:50:33.9 +16:06:01 6.3 0.89 81 PPM 128627 11:54:29.7 +16:42:24 8.2 0.47 82 PPM 128610 11:53:03.7 +16:56:28 9.4 0.15 81 4835_Asaeus 11:52:37.0 +16:50:32 15.7 82 Positions are for equinox of date
Star training set for 4835_Asaeus, (2025/07/22 10:32UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 25.39 61 Denebola 11:49:02.7 +14:34:16 2.1 2.47 82 PPM 128581 11:49:14.9 +16:14:33 6.3 0.89 81 PPM 128627 11:53:10.8 +16:50:56 8.2 0.47 82 PPM 128610 11:51:44.8 +17:05:00 9.4 0.15 81 4835_Asaeus 11:51:18.1 +16:59:04 15.7 81 Positions are for J2000