Occultation event with (30102) 00FC1, event index number 990
Regions able to see the event: Europe
Geocentric closest approach at 2025/05/21 00:09:16 UTC
J2000 position of star is 09:52:10.1 +36:44:45
Equinox of date position of star is 09:53:41.4 +36:37:32
Star is 152 degrees from the moon. Moon is 45% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=16.8
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 5.9 per integration for unocculted signal
Expected flux drop is 83% with SNR of 4.9 for the occulted depth (per occulted point)
Apparent velocity is 21.6 km/sec on the sky relative to the star, or, 19.2 arcsec/hr.
Position angle of asteroid motion is 315.2 degrees
The recommended exposure time corresponds to 9.7 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 45.8 km.
The sky-plane scale is 4054.1 km/arcsec.
Diameter estimates:
40.0 km assuming a 5% albedo, aximum of 1.9 sec for a central chord
16.3 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 40.0 km used for deployment plan.
Star training set for 30102_00FC1, (2025/05/21 00:09UT) Object RA Dec mag sep mel Regulus 10:09:43.3 +11:50:32 1.3 25.04 173 Merak 11:03:21.4 +56:14:45 2.4 22.85 134 13 LMi 09:44:14.1 +34:58:34 6.1 2.53 153 PPM 074801 09:52:40.6 +36:22:10 8.0 0.33 152 30102_00FC1 09:53:41.4 +36:37:32 16.8 152 Positions are for equinox of date
Star training set for 30102_00FC1, (2025/05/21 00:09UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 25.04 173 Merak 11:01:50.7 +56:22:58 2.4 22.85 134 13 LMi 09:42:42.7 +35:05:35 6.1 2.53 153 PPM 074801 09:51:09.3 +36:29:21 8.0 0.33 152 30102_00FC1 09:52:10.1 +36:44:45 16.8 152 Positions are for J2000