Occultation event with (38050) Bias, event index number 3866
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/20 00:14:28 UTC
J2000 position of star is 11:01:22.7 -16:25:44
Equinox of date position of star is 11:02:41.8 -16:34:19
Star is 24 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 31.1 km/sec on the sky relative to the star, or, 26.7 arcsec/hr.
Position angle of asteroid motion is 92.1 degrees
The recommended exposure time corresponds to 23.3 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 39.4 km.
The sky-plane scale is 4182.6 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2026/07/20 00:14UT) Object RA Dec mag sep mel Regulus 10:09:47.0 +11:50:11 1.3 31.27 41 4Gam Crv 12:17:10.5 -17:41:21 2.6 17.82 11 PPM 223760 11:00:49.8 -16:29:47 5.3 0.45 25 PPM 223839 11:03:39.4 -16:54:06 8.5 0.40 24 PPM 223832 11:03:26.1 -16:36:53 9.0 0.18 24 38050_Bias 11:02:41.8 -16:34:19 15.8 24 Positions are for equinox of date
Star training set for 38050_Bias, (2026/07/20 00:14UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 31.27 41 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.82 11 PPM 223760 10:59:30.8 -16:21:13 5.3 0.45 25 PPM 223839 11:02:20.4 -16:45:30 8.5 0.40 24 PPM 223832 11:02:07.1 -16:28:18 9.0 0.18 24 38050_Bias 11:01:22.7 -16:25:44 15.8 24 Positions are for J2000