Occultation event with (38050) Bias, event index number 3520
Regions able to see the event: Australia
Geocentric closest approach at 2026/03/27 15:13:47 UTC
J2000 position of star is 10:32:49.7 -24:05:34
Equinox of date position of star is 10:34:04.6 -24:13:43
Star is 58 degrees from the moon. Moon is 70% illuminated.
Stellar brightness G=11.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 31.2 per integration for unocculted signal
Expected flux drop is 97% with SNR of 30.2 for the occulted depth (per occulted point)
Apparent velocity is 17.5 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 138.5 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 19.2 km.
The sky-plane scale is 3187.7 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2026/03/27 15:14UT) Object RA Dec mag sep mel Spica 13:26:34.7 -11:17:51 1.0 42.86 83 Alphard 09:28:52.6 -08:46:25 2.0 21.93 37 44 Hya 10:35:15.9 -23:52:52 5.1 0.44 58 PPM 257851 10:35:28.1 -24:26:17 8.1 0.38 58 PPM 257814 10:34:04.2 -24:27:29 8.9 0.23 58 38050_Bias 10:34:04.6 -24:13:43 15.0 58 Positions are for equinox of date
Star training set for 38050_Bias, (2026/03/27 15:14UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 42.86 83 Alphard 09:27:35.2 -08:39:30 2.0 21.93 37 44 Hya 10:34:00.9 -23:44:42 5.1 0.44 58 PPM 257851 10:34:13.2 -24:18:07 8.1 0.38 58 PPM 257814 10:32:49.4 -24:19:21 8.9 0.23 58 38050_Bias 10:32:49.7 -24:05:34 15.0 58 Positions are for J2000