Occultation event with (38050) Bias, event index number 5085
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/12/07 03:17:18 UTC
J2000 position of star is 12:57:04.8 -24:52:34
Equinox of date position of star is 12:58:31.8 -25:01:17
Star is 33 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 77% with SNR of 7.2 for the occulted depth (per occulted point)
Apparent velocity is 29.8 km/sec on the sky relative to the star, or, 25.1 arcsec/hr.
Position angle of asteroid motion is 117.6 degrees
The recommended exposure time corresponds to 13.4 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 36.5 km.
The sky-plane scale is 4283.6 km/arcsec.
Diameter estimates:
63.4 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
25.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 61.6 km used for deployment plan.
Star training set for 38050_Bias, (2026/12/07 03:17UT) Object RA Dec mag sep mel Spica 13:26:37.0 -11:18:04 1.0 15.25 30 9Bet Crv 12:35:48.5 -23:32:43 2.6 5.38 38 PPM 261041 12:58:59.6 -22:53:55 6.0 2.13 33 PPM 261030 12:58:30.7 -24:42:00 8.4 0.32 33 PPM 261016 12:57:57.2 -25:04:20 9.4 0.14 33 38050_Bias 12:58:31.8 -25:01:17 15.8 32 Positions are for equinox of date
Star training set for 38050_Bias, (2026/12/07 03:17UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 15.25 30 9Bet Crv 12:34:23.2 -23:23:50 2.6 5.38 38 PPM 261041 12:57:33.0 -22:45:13 6.0 2.13 33 PPM 261030 12:57:03.8 -24:33:17 8.4 0.32 33 PPM 261016 12:56:30.2 -24:55:37 9.4 0.14 33 38050_Bias 12:57:04.8 -24:52:34 15.8 33 Positions are for J2000