Occultation event with (8125) Tyndareus, event index number 899
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/12 06:55:48 UTC
J2000 position of star is 10:50:23.7 -00:27:38
Equinox of date position of star is 10:51:41.4 -00:35:42
Star is 31 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 11.5 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
The recommended exposure time corresponds to 17.2 km per image.
The 1-sigma error in the time of the event is 3.8 seconds.
The 1-sigma cross-track error in the shadow position is 36.2 km.
The sky-plane scale is 3334.4 km/arcsec.
Diameter estimates:
40.7 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 40.7 km used for deployment plan.
Star training set for 8125_Tyndareus, (2025/04/12 06:56UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 16.23 45 55 Leo 10:57:00.4 +00:36:06 6.2 1.79 30 PPM 178316 10:53:53.8 -00:20:12 7.4 0.61 31 PPM 178309 10:52:47.4 -00:37:07 9.2 0.28 31 PPM 178306 10:51:34.1 -00:23:20 10.6 0.21 31 8125_Tyndareus 10:51:41.4 -00:35:42 16.1 31 Positions are for equinox of date
Star training set for 8125_Tyndareus, (2025/04/12 06:56UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.23 45 55 Leo 10:55:42.5 +00:44:13 6.2 1.79 30 PPM 178316 10:52:36.1 -00:12:07 7.4 0.61 31 PPM 178309 10:51:29.8 -00:29:02 9.2 0.28 31 PPM 178306 10:50:16.4 -00:15:16 10.6 0.21 31 8125_Tyndareus 10:50:23.7 -00:27:38 16.1 31 Positions are for J2000