Occultation event with (38050) Bias, event index number 912
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/04/17 01:04:02 UTC
J2000 position of star is 08:11:46.6 -11:06:31
Equinox of date position of star is 08:12:58.8 -11:11:08
Star is 115 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 8.2 per integration for unocculted signal
Expected flux drop is 50% with SNR of 4.1 for the occulted depth (per occulted point)
Apparent velocity is 14.6 km/sec on the sky relative to the star, or, 15.2 arcsec/hr.
The recommended exposure time corresponds to 15.3 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 24.9 km.
The sky-plane scale is 3471.5 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 4.3 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 63.4 km used for deployment plan.
Star training set for 38050_Bias, (2025/04/17 01:04UT) Object RA Dec mag sep mel Sirius 06:46:15.7 -16:45:09 -1.5 21.75 126 15Rho Pup 08:08:37.3 -24:22:43 2.8 13.23 107 PPM 219950 08:20:27.8 -10:14:46 6.3 2.06 114 PPM 219798 08:13:36.7 -10:54:37 8.2 0.32 115 PPM 219765 08:12:23.5 -11:20:40 8.6 0.21 115 38050_Bias 08:12:58.8 -11:11:08 15.3 115 Positions are for equinox of date
Star training set for 38050_Bias, (2025/04/17 01:04UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 21.75 126 15Rho Pup 08:07:32.5 -24:18:14 2.8 13.23 107 PPM 219950 08:19:15.0 -10:09:56 6.3 2.06 114 PPM 219798 08:12:24.4 -10:50:00 8.2 0.32 115 PPM 219765 08:11:11.4 -11:16:04 8.6 0.21 115 38050_Bias 08:11:46.6 -11:06:31 15.3 115 Positions are for J2000