Occultation event with (38050) Bias, event index number 922
Regions able to see the event: NZ
Geocentric closest approach at 2025/04/21 07:03:02 UTC
J2000 position of star is 08:13:04.5 -10:48:10
Equinox of date position of star is 08:14:17.0 -10:52:49
Star is 146 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 8.9 per integration for unocculted signal
Expected flux drop is 54% with SNR of 4.8 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
The recommended exposure time corresponds to 15.7 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 23.8 km.
The sky-plane scale is 3513.5 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 4.0 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 63.4 km used for deployment plan.
Star training set for 38050_Bias, (2025/04/21 07:03UT) Object RA Dec mag sep mel Sirius 06:46:15.7 -16:45:09 -1.5 22.14 132 15Rho Pup 08:08:37.3 -24:22:43 2.8 13.57 132 PPM 219950 08:20:27.8 -10:14:46 6.3 1.65 146 PPM 219798 08:13:36.8 -10:54:38 8.2 0.17 146 38050_Bias 08:14:17.0 -10:52:49 15.3 146 Positions are for equinox of date
Star training set for 38050_Bias, (2025/04/21 07:03UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 22.14 132 15Rho Pup 08:07:32.5 -24:18:14 2.8 13.57 132 PPM 219950 08:19:15.0 -10:09:56 6.3 1.65 146 PPM 219798 08:12:24.4 -10:50:00 8.2 0.17 146 38050_Bias 08:13:04.5 -10:48:10 15.3 146 Positions are for J2000