Occultation event with (38050) Bias, event index number 976
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/05/16 02:13:19 UTC
J2000 position of star is 08:24:32.7 -09:25:19
Equinox of date position of star is 08:25:46.2 -09:30:20
Star is 131 degrees from the moon. Moon is 89% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 4.4 per integration for unocculted signal
Expected flux drop is 45% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 23.3 km/sec on the sky relative to the star, or, 22.3 arcsec/hr.
Position angle of asteroid motion is 10.8 degrees
The recommended exposure time corresponds to 15.2 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 15.0 km.
The sky-plane scale is 3762.9 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 63.4 km used for deployment plan.
Star training set for 38050_Bias, (2025/05/16 02:13UT) Object RA Dec mag sep mel Sirius 06:46:15.9 -16:45:09 -1.5 25.26 134 15Rho Pup 08:08:37.5 -24:22:44 2.8 15.42 121 PPM 191392 08:30:04.4 -09:50:04 6.1 1.11 130 PPM 191315 08:26:22.5 -09:52:09 8.2 0.39 130 PPM 191314 08:26:13.4 -09:26:31 9.2 0.13 131 38050_Bias 08:25:46.2 -09:30:20 15.5 131 Positions are for equinox of date
Star training set for 38050_Bias, (2025/05/16 02:13UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 25.26 134 15Rho Pup 08:07:32.5 -24:18:14 2.8 15.42 121 PPM 191392 08:28:51.0 -09:44:55 6.1 1.11 130 PPM 191315 08:25:09.2 -09:47:07 8.2 0.39 130 PPM 191314 08:24:59.9 -09:21:29 9.2 0.13 131 38050_Bias 08:24:32.7 -09:25:19 15.5 131 Positions are for J2000