Occultation event with (38050) Bias, event index number 1516
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/15 06:46:23 UTC
J2000 position of star is 10:50:12.8 -20:15:01
Equinox of date position of star is 10:51:28.6 -20:23:16
Star is 25 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.5 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 25.3 arcsec/hr.
Position angle of asteroid motion is 132.2 degrees
The recommended exposure time corresponds to 9.9 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 23.8 km.
The sky-plane scale is 4016.4 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 2.2 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2025/11/15 06:46UT) Object RA Dec mag sep mel Regulus 10:09:44.8 +11:50:23 1.3 33.82 29 4Gam Crv 12:17:08.4 -17:41:08 2.6 20.41 18 PPM 258298 10:56:27.5 -20:48:12 6.4 1.24 25 PPM 258153 10:49:08.9 -20:28:35 8.2 0.55 25 PPM 258198 10:51:41.5 -20:19:51 8.9 0.08 25 38050_Bias 10:51:28.6 -20:23:16 15.6 25 Positions are for equinox of date
Star training set for 38050_Bias, (2025/11/15 06:46UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 33.82 29 4Gam Crv 12:15:48.1 -17:32:30 2.6 20.41 18 PPM 258298 10:55:11.6 -20:39:54 6.4 1.24 25 PPM 258153 10:47:53.3 -20:20:22 8.2 0.55 25 PPM 258198 10:50:25.7 -20:11:35 8.9 0.08 25 38050_Bias 10:50:12.8 -20:15:01 15.6 25 Positions are for J2000