Occultation event with (4835) Asaeus, event index number 1707
Regions able to see the event: Japan
Geocentric closest approach at 2025/12/21 21:08:00 UTC
J2000 position of star is 14:16:54.5 +04:39:53
Equinox of date position of star is 14:18:12.8 +04:32:44
Star is 82 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.19 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 89% with SNR of 8.9 for the occulted depth (per occulted point)
Apparent velocity is 29.8 km/sec on the sky relative to the star, or, 29.3 arcsec/hr.
Position angle of asteroid motion is 93.7 degrees
The recommended exposure time corresponds to 5.7 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 34.2 km.
The sky-plane scale is 3649.9 km/arcsec.
Diameter estimates:
45.7 km assuming a 5% albedo, aximum of 1.5 sec for a central chord
18.7 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 30.2 km used for deployment plan.
Star training set for 4835_Asaeus, (2025/12/21 21:08UT) Object RA Dec mag sep mel Arcturus 14:16:50.9 +19:02:55 0.0 14.51 89 Vindemiatrix 13:03:28.2 +10:49:12 2.8 19.54 101 PPM 160430 14:13:34.8 +02:17:18 4.7 2.54 82 PPM 160509 14:19:01.8 +03:36:50 8.3 0.95 81 PPM 160506 14:18:29.0 +04:39:51 9.9 0.14 82 4835_Asaeus 14:18:12.8 +04:32:44 15.9 81 Positions are for equinox of date
Star training set for 4835_Asaeus, (2025/12/21 21:08UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 14.51 89 Vindemiatrix 13:02:10.1 +10:57:33 2.8 19.54 101 PPM 160430 14:12:15.7 +02:24:33 4.7 2.54 82 PPM 160509 14:17:43.2 +03:43:58 8.3 0.95 81 PPM 160506 14:17:10.7 +04:47:00 9.9 0.14 82 4835_Asaeus 14:16:54.5 +04:39:53 15.9 82 Positions are for J2000