Occultation event with (5120) Bitias, event index number 1393
Regions able to see the event: SMexico
Geocentric closest approach at 2025/10/20 07:21:41 UTC
J2000 position of star is 01:37:55.1 +42:50:46
Equinox of date position of star is 01:39:27.8 +42:58:36
Star is 143 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 60% with SNR of 5.6 for the occulted depth (per occulted point)
Apparent velocity is 16.1 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 70.7 degrees
The recommended exposure time corresponds to 11.3 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 27.4 km.
The sky-plane scale is 3034.7 km/arcsec.
Diameter estimates:
50.8 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
20.8 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 48.0 km used for deployment plan.
Star training set for 5120_Bitias, (2025/10/20 07:22UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:32 0.8 46.00 124 57Gam1And 02:05:29.7 +42:27:08 2.3 4.81 141 PPM 044298 01:42:13.1 +43:25:38 5.8 0.67 142 PPM 044210 01:38:13.8 +42:04:41 8.3 0.93 144 PPM 044221 01:38:29.2 +42:55:29 9.5 0.19 143 5120_Bitias 01:39:27.8 +42:58:36 15.3 143 Positions are for equinox of date
Star training set for 5120_Bitias, (2025/10/20 07:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 46.00 124 57Gam1And 02:03:54.1 +42:19:46 2.3 4.81 141 PPM 044298 01:40:39.9 +43:17:51 5.8 0.67 142 PPM 044210 01:36:41.7 +41:56:50 8.3 0.93 144 PPM 044221 01:36:56.7 +42:47:39 9.5 0.19 143 5120_Bitias 01:37:55.1 +42:50:46 15.3 143 Positions are for J2000