Occultation event with (38050) Bias, event index number 3683
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/25 16:00:49 UTC
J2000 position of star is 10:26:20.0 -21:00:28
Equinox of date position of star is 10:27:35.6 -21:08:33
Star is 36 degrees from the moon. Moon is 67% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.2
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 24% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 15.9 arcsec/hr.
Position angle of asteroid motion is 174.2 degrees
The recommended exposure time corresponds to 17.0 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 5.5 km.
The sky-plane scale is 3344.1 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, maximum of 4.3 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2026/04/25 16:01UT) Object RA Dec mag sep mel Regulus 10:09:46.3 +11:50:15 1.3 33.27 5 Alphard 09:28:52.8 -08:46:26 2.0 18.79 24 PPM 222856 10:23:28.5 -20:00:01 6.3 1.49 35 PPM 257687 10:28:52.6 -21:33:59 8.0 0.52 37 PPM 257659 10:27:33.3 -21:07:50 8.6 0.01 36 38050_Bias 10:27:35.6 -21:08:33 15.2 37 Positions are for equinox of date
Star training set for 38050_Bias, (2026/04/25 16:01UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 33.27 5 Alphard 09:27:35.2 -08:39:30 2.0 18.79 24 PPM 222856 10:22:12.9 -19:52:00 6.3 1.49 35 PPM 257687 10:27:37.1 -21:25:54 8.0 0.52 37 PPM 257659 10:26:17.7 -20:59:46 8.6 0.01 36 38050_Bias 10:26:20.0 -21:00:28 15.2 36 Positions are for J2000