Occultation event with (38050) Bias, event index number 1716
Regions able to see the event: Senegal
Geocentric closest approach at 2025/12/24 02:34:48 UTC
J2000 position of star is 11:03:15.9 -24:18:28
Equinox of date position of star is 11:04:31.9 -24:26:53
Star is 132 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 7.3 per integration for unocculted signal
Expected flux drop is 50% with SNR of 3.7 for the occulted depth (per occulted point)
Apparent velocity is 14.2 km/sec on the sky relative to the star, or, 14.0 arcsec/hr.
Position angle of asteroid motion is 163.9 degrees
The recommended exposure time corresponds to 14.9 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 4.7 km.
The sky-plane scale is 3647.5 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 4.5 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2025/12/24 02:35UT) Object RA Dec mag sep mel Spica 13:26:33.9 -11:17:46 1.0 36.12 114 4Gam Crv 12:17:08.8 -17:41:10 2.6 18.22 125 11Bet Crt 11:12:56.4 -22:58:05 4.5 2.43 132 PPM 258462 11:04:11.2 -24:07:39 8.2 0.33 132 PPM 258452 11:03:53.0 -24:25:22 9.5 0.15 132 38050_Bias 11:04:31.9 -24:26:53 15.5 132 Positions are for equinox of date
Star training set for 38050_Bias, (2025/12/24 02:35UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 36.12 114 4Gam Crv 12:15:48.1 -17:32:30 2.6 18.22 125 11Bet Crt 11:11:39.5 -22:49:36 4.5 2.43 132 PPM 258462 11:02:55.0 -23:59:14 8.2 0.33 132 PPM 258452 11:02:37.0 -24:16:57 9.5 0.15 132 38050_Bias 11:03:15.9 -24:18:28 15.5 132 Positions are for J2000