Occultation event with (39264) 00YQ139, event index number 760
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/03/05 18:49:57 UTC
J2000 position of star is 09:59:36.4 -06:21:33
Equinox of date position of star is 10:00:51.9 -06:28:50
Star is 92 degrees from the moon. Moon is 40% 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 61% with SNR of 3.1 per integration
Apparent velocity is 17.4 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
The recommended exposure time corresponds to 13.9 km per image.
The 1-sigma error in the time of the event is 2.9 seconds.
The 1-sigma cross-track error in the shadow position is 26.2 km.
The sky-plane scale is 3156.8 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
16.7 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 40.9 km used for deployment plan.
Star training set for 39264_00YQ139, (2025/03/05 18:50UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:35 1.3 18.46 86 Alphard 09:28:49.5 -08:46:08 2.0 8.26 86 8Gam Sex 09:53:45.2 -08:13:28 4.8 2.48 91 PPM 192984 10:01:59.1 -07:13:11 8.4 0.79 93 PPM 192968 10:01:06.6 -06:29:04 9.4 0.06 92 39264_00YQ139 10:00:51.9 -06:28:50 15.8 92 Positions are for equinox of date
Star training set for 39264_00YQ139, (2025/03/05 18:50UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 18.46 86 Alphard 09:27:35.2 -08:39:30 2.0 8.26 86 8Gam Sex 09:52:30.3 -08:06:19 4.8 2.48 91 PPM 192984 10:00:43.7 -07:05:53 8.4 0.79 93 PPM 192968 09:59:51.1 -06:21:47 9.4 0.06 92 39264_00YQ139 09:59:36.4 -06:21:33 15.8 92 Positions are for J2000