Occultation event with (38050) Bias, event index number 897
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/04/11 03:59:07 UTC
J2000 position of star is 08:10:20.4 -11:33:33
Equinox of date position of star is 08:11:32.3 -11:38:07
Star is 59 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 30% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
The recommended exposure time corresponds to 15.4 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 26.2 km.
The sky-plane scale is 3414.6 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 4.7 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 63.4 km used for deployment plan.
Star training set for 38050_Bias, (2025/04/11 03:59UT) Object RA Dec mag sep mel Sirius 06:46:15.7 -16:45:09 -1.5 21.28 80 15Rho Pup 08:08:37.3 -24:22:43 2.8 12.76 62 18 Pup 08:11:50.1 -13:52:30 5.7 2.24 59 PPM 219724 08:10:47.5 -11:30:24 8.2 0.22 59 PPM 219747 08:11:44.8 -11:37:13 9.0 0.05 59 38050_Bias 08:11:32.3 -11:38:07 15.3 59 Positions are for equinox of date
Star training set for 38050_Bias, (2025/04/11 03:59UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 21.28 80 15Rho Pup 08:07:32.5 -24:18:14 2.8 12.76 62 18 Pup 08:10:39.4 -13:47:56 5.7 2.24 59 PPM 219724 08:09:35.6 -11:25:52 8.2 0.22 59 PPM 219747 08:10:32.9 -11:32:38 9.0 0.05 59 38050_Bias 08:10:20.4 -11:33:33 15.3 59 Positions are for J2000