Occultation event with (15977) 98MA11, event index number 1541
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/18 11:04:19 UTC
J2000 position of star is 00:46:59.4 +08:14:04
Equinox of date position of star is 00:48:20.1 +08:22:31
Star is 157 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 63% with SNR of 6.3 for the occulted depth (per occulted point)
Apparent velocity is 10.7 km/sec on the sky relative to the star, or, 12.5 arcsec/hr.
Position angle of asteroid motion is 39.5 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 12.7 km.
The sky-plane scale is 3078.5 km/arcsec.
Diameter estimates:
47.9 km assuming a 5% albedo, aximum of 4.5 sec for a central chord
19.5 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 43.5 km used for deployment plan.
Star training set for 15977_98MA11, (2025/11/18 11:04UT) Object RA Dec mag sep mel Algenib 00:14:34.3 +15:19:38 2.8 10.79 152 63Del Psc 00:50:01.7 +07:43:32 4.4 0.77 158 PPM 143937 00:50:55.6 +08:05:43 7.9 0.70 158 PPM 143883 00:48:14.3 +08:26:56 9.2 0.08 157 15977_98MA11 00:48:20.1 +08:22:31 15.5 158 Positions are for equinox of date
Star training set for 15977_98MA11, (2025/11/18 11:04UT) Object RA Dec mag sep mel Algenib 00:13:14.2 +15:11:00 2.8 10.79 152 63Del Psc 00:48:41.1 +07:35:05 4.4 0.77 158 PPM 143937 00:49:34.9 +07:57:17 7.9 0.70 158 PPM 143883 00:46:53.7 +08:18:28 9.2 0.08 157 15977_98MA11 00:46:59.4 +08:14:04 15.5 157 Positions are for J2000