Occultation event with (15977) 98MA11, event index number 1453
Regions able to see the event: Europe,SAmericaN
Geocentric closest approach at 2025/11/03 21:30:04 UTC
J2000 position of star is 00:51:13.8 +09:16:59
Equinox of date position of star is 00:52:34.6 +09:25:24
Star is 3 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 21% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 17.8 arcsec/hr.
Position angle of asteroid motion is 48.5 degrees
The recommended exposure time corresponds to 23.7 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 2986.5 km/arcsec.
Diameter estimates:
47.9 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
19.5 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 47.9 km used for deployment plan.
Star training set for 15977_98MA11, (2025/11/03 21:30UT) Object RA Dec mag sep mel Algenib 00:14:34.2 +15:19:37 2.8 10.99 13 63Del Psc 00:50:01.6 +07:43:31 4.4 1.81 4 PPM 143904 00:49:31.4 +09:21:44 7.9 0.76 4 PPM 143972 00:52:22.9 +09:22:09 9.8 0.07 3 15977_98MA11 00:52:34.6 +09:25:24 15.3 3 Positions are for equinox of date
Star training set for 15977_98MA11, (2025/11/03 21:30UT) Object RA Dec mag sep mel Algenib 00:13:14.2 +15:11:00 2.8 10.99 13 63Del Psc 00:48:41.1 +07:35:05 4.4 1.81 4 PPM 143904 00:48:10.8 +09:13:17 7.9 0.76 4 PPM 143972 00:51:02.2 +09:13:44 9.8 0.07 3 15977_98MA11 00:51:13.8 +09:16:59 15.3 3 Positions are for J2000