Occultation event with (38050) Bias, event index number 914
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/18 04:14:00 UTC
J2000 position of star is 08:12:06.1 -11:01:32
Equinox of date position of star is 08:13:18.3 -11:06:09
Star is 125 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.7 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 15.4 arcsec/hr.
The recommended exposure time corresponds to 3.7 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 24.2 km.
The sky-plane scale is 3482.6 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 1.7 sec for a central chord
Cross-track diameter of 63.4 km used for deployment plan.
Star training set for 38050_Bias, (2025/04/18 04:14UT) Object RA Dec mag sep mel Sirius 06:46:15.7 -16:45:09 -1.5 21.85 132 15Rho Pup 08:08:37.3 -24:22:43 2.8 13.32 116 PPM 219950 08:20:27.8 -10:14:46 6.3 1.96 125 PPM 219798 08:13:36.7 -10:54:38 8.2 0.21 126 PPM 219810 08:14:04.4 -11:10:21 9.1 0.20 125 38050_Bias 08:13:18.3 -11:06:09 15.3 125 Positions are for equinox of date
Star training set for 38050_Bias, (2025/04/18 04:14UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 21.85 132 15Rho Pup 08:07:32.5 -24:18:14 2.8 13.32 116 PPM 219950 08:19:15.0 -10:09:56 6.3 1.96 125 PPM 219798 08:12:24.4 -10:50:00 8.2 0.21 126 PPM 219810 08:12:52.2 -11:05:42 9.1 0.20 125 38050_Bias 08:12:06.1 -11:01:32 15.3 125 Positions are for J2000