Occultation event with (15977) 98MA11, event index number 1702
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/20 17:49:03 UTC
J2000 position of star is 00:46:29.6 +06:53:35
Equinox of date position of star is 00:47:50.3 +07:02:04
Star is 97 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 62% with SNR of 6.2 for the occulted depth (per occulted point)
Apparent velocity is 7.0 km/sec on the sky relative to the star, or, 7.4 arcsec/hr.
Position angle of asteroid motion is 110.9 degrees
The recommended exposure time corresponds to 9.4 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 21.9 km.
The sky-plane scale is 3389.0 km/arcsec.
Diameter estimates:
47.9 km assuming a 5% albedo, aximum of 6.9 sec for a central chord
19.5 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 43.5 km used for deployment plan.
Star training set for 15977_98MA11, (2025/12/20 17:49UT) Object RA Dec mag sep mel Algenib 00:14:34.6 +15:19:40 2.8 11.63 94 63Del Psc 00:50:02.0 +07:43:33 4.4 0.88 98 60 Psc 00:48:44.4 +06:52:56 7.2 0.27 97 PPM 143859 00:47:05.4 +07:02:28 9.1 0.19 97 15977_98MA11 00:47:50.3 +07:02:04 15.8 97 Positions are for equinox of date
Star training set for 15977_98MA11, (2025/12/20 17:49UT) Object RA Dec mag sep mel Algenib 00:13:14.2 +15:11:00 2.8 11.63 94 63Del Psc 00:48:41.1 +07:35:05 4.4 0.88 98 60 Psc 00:47:23.6 +06:44:27 7.2 0.27 97 PPM 143859 00:45:44.7 +06:53:58 9.1 0.19 97 15977_98MA11 00:46:29.6 +06:53:35 15.8 97 Positions are for J2000