Occultation event with (8125) Tyndareus, event index number 742
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/03/01 08:11:45 UTC
J2000 position of star is 11:09:30.3 -01:52:45
Equinox of date position of star is 11:10:47.5 -02:00:57
Star is 168 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
Expected flux drop is 62% with SNR of 3.0 per integration
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
The recommended exposure time corresponds to 14.1 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 33.5 km.
The sky-plane scale is 3213.7 km/arcsec.
Diameter estimates:
40.5 km assuming a 5% albedo, aximum of 2.3 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 40.5 km used for deployment plan.
Star training set for 8125_Tyndareus, (2025/03/01 08:12UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 20.55 151 Denebola 11:50:20.5 +14:25:53 2.1 19.14 166 PPM 178367 11:04:31.8 -00:53:21 6.2 1.93 167 PPM 178398 11:09:34.1 -02:02:23 7.2 0.31 168 PPM 178414 11:11:19.0 -01:56:58 8.9 0.15 168 8125_Tyndareus 11:10:47.5 -02:00:57 15.8 168 Positions are for equinox of date
Star training set for 8125_Tyndareus, (2025/03/01 08:12UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 20.55 151 Denebola 11:49:02.7 +14:34:17 2.1 19.14 166 PPM 178367 11:03:14.6 -00:45:12 6.2 1.93 167 PPM 178398 11:08:17.0 -01:54:11 7.2 0.31 168 PPM 178414 11:10:01.8 -01:48:45 8.9 0.15 168 8125_Tyndareus 11:09:30.3 -01:52:45 15.8 168 Positions are for J2000