Occultation event with (4835) Asaeus, event index number 1724
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/26 17:48:07 UTC
J2000 position of star is 14:20:37.8 +04:37:12
Equinox of date position of star is 14:21:56.1 +04:30:07
Star is 137 degrees from the moon. Moon is 39% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 54% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 28.0 km/sec on the sky relative to the star, or, 27.9 arcsec/hr.
Position angle of asteroid motion is 91.8 degrees
The recommended exposure time corresponds to 11.2 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 35.0 km.
The sky-plane scale is 3610.1 km/arcsec.
Diameter estimates:
45.7 km assuming a 5% albedo, aximum of 1.6 sec for a central chord
18.7 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 30.2 km used for deployment plan.
Star training set for 4835_Asaeus, (2025/12/26 17:48UT) Object RA Dec mag sep mel Arcturus 14:16:50.9 +19:02:55 0.0 14.60 136 27Bet Lib 15:18:24.5 -09:28:38 2.6 19.83 122 PPM 160711 14:32:03.6 +04:39:29 6.0 2.53 135 PPM 160515 14:19:48.5 +03:33:20 7.7 1.09 138 PPM 160547 14:22:05.4 +04:10:17 9.3 0.33 137 4835_Asaeus 14:21:56.1 +04:30:07 15.9 137 Positions are for equinox of date
Star training set for 4835_Asaeus, (2025/12/26 17:48UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 14.60 136 27Bet Lib 15:17:00.3 -09:22:59 2.6 19.83 122 PPM 160711 14:30:45.4 +04:46:20 6.0 2.53 135 PPM 160515 14:18:29.8 +03:40:28 7.7 1.09 138 PPM 160547 14:20:46.9 +04:17:22 9.3 0.33 137 4835_Asaeus 14:20:37.8 +04:37:12 15.9 137 Positions are for J2000