Occultation event with (8125) Tyndareus, event index number 1053
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/06/12 23:28:39 UTC
J2000 position of star is 10:52:28.5 -00:26:22
Equinox of date position of star is 10:53:46.7 -00:34:30
Star is 116 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 6.1 per integration for unocculted signal
Expected flux drop is 77% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 15.6 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
The recommended exposure time corresponds to 10.1 km per image.
The 1-sigma error in the time of the event is 3.4 seconds.
The 1-sigma cross-track error in the shadow position is 41.6 km.
The sky-plane scale is 3960.0 km/arcsec.
Diameter estimates:
40.7 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 40.7 km used for deployment plan.
Star training set for 8125_Tyndareus, (2025/06/12 23:29UT) Object RA Dec mag sep mel Regulus 10:09:43.5 +11:50:31 1.3 16.55 131 55 Leo 10:57:00.9 +00:36:02 6.2 1.43 116 PPM 178316 10:53:54.3 -00:20:15 7.4 0.24 116 PPM 178313 10:53:18.1 -00:30:31 9.8 0.14 116 PPM 178319 10:54:00.4 -00:32:12 10.6 0.07 116 8125_Tyndareus 10:53:46.7 -00:34:30 16.7 115 Positions are for equinox of date
Star training set for 8125_Tyndareus, (2025/06/12 23:29UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.55 131 55 Leo 10:55:42.5 +00:44:13 6.2 1.43 116 PPM 178316 10:52:36.1 -00:12:07 7.4 0.24 116 PPM 178313 10:52:00.0 -00:22:22 9.8 0.14 116 PPM 178319 10:52:42.3 -00:24:04 10.6 0.07 116 8125_Tyndareus 10:52:28.5 -00:26:22 16.7 116 Positions are for J2000