Occultation event with (38050) Bias, event index number 1705
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/21 18:27:08 UTC
J2000 position of star is 11:02:57.8 -24:05:44
Equinox of date position of star is 11:04:13.9 -24:14:09
Star is 107 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 6.4 per integration for unocculted signal
Expected flux drop is 48% with SNR of 3.1 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 14.7 arcsec/hr.
Position angle of asteroid motion is 160.5 degrees
The recommended exposure time corresponds to 14.9 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 7.0 km.
The sky-plane scale is 3670.5 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, aximum of 4.2 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 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2025/12/21 18:27UT) Object RA Dec mag sep mel Spica 13:26:33.9 -11:17:46 1.0 36.13 85 4Gam Crv 12:17:08.7 -17:41:10 2.6 18.22 97 11Bet Crt 11:12:56.3 -22:58:05 4.5 2.36 107 PPM 258462 11:04:11.1 -24:07:39 8.2 0.11 107 38050_Bias 11:04:13.9 -24:14:09 15.5 107 Positions are for equinox of date
Star training set for 38050_Bias, (2025/12/21 18:27UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 36.13 85 4Gam Crv 12:15:48.1 -17:32:30 2.6 18.22 97 11Bet Crt 11:11:39.5 -22:49:36 4.5 2.36 107 PPM 258462 11:02:55.0 -23:59:14 8.2 0.11 107 38050_Bias 11:02:57.8 -24:05:44 15.5 107 Positions are for J2000