Occultation event with (22014) 99XQ96, event index number 981
Regions able to see the event: Senegal
Geocentric closest approach at 2025/05/17 20:26:34 UTC
J2000 position of star is 08:42:13.1 -10:29:27
Equinox of date position of star is 08:43:26.3 -10:34:59
Star is 142 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 36% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 20.8 km/sec on the sky relative to the star, or, 21.5 arcsec/hr.
Position angle of asteroid motion is 13.1 degrees
The recommended exposure time corresponds to 15.6 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 21.9 km.
The sky-plane scale is 3494.2 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 22014_99XQ96, (2025/05/17 20:27UT) Object RA Dec mag sep mel Sirius 06:46:15.9 -16:45:09 -1.5 29.09 135 Alphard 09:28:50.1 -08:46:11 2.0 11.33 139 PPM 220578 08:47:19.9 -11:06:02 6.1 1.09 141 PPM 220473 08:42:04.5 -10:32:14 7.8 0.34 142 PPM 220494 08:42:56.5 -10:34:34 9.2 0.12 142 22014_99XQ96 08:43:26.3 -10:34:59 15.6 142 Positions are for equinox of date
Star training set for 22014_99XQ96, (2025/05/17 20:27UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 29.09 135 Alphard 09:27:35.2 -08:39:30 2.0 11.33 139 PPM 220578 08:46:06.8 -11:00:24 6.1 1.09 141 PPM 220473 08:40:51.2 -10:26:45 7.8 0.34 142 PPM 220494 08:41:43.2 -10:29:03 9.2 0.12 142 22014_99XQ96 08:42:13.1 -10:29:27 15.6 142 Positions are for J2000