Occultation event with (15977) 98MA11, event index number 3877
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/07/22 03:01:26 UTC
J2000 position of star is 03:28:18.8 +14:56:58
Equinox of date position of star is 03:29:47.9 +15:02:24
Star is 161 degrees from the moon. Moon is 57% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 67% with SNR of 2.9 for the occulted depth (per occulted point)
Apparent velocity is 25.6 km/sec on the sky relative to the star, or, 24.0 arcsec/hr.
Position angle of asteroid motion is 88.4 degrees
The recommended exposure time corresponds to 10.2 km per image.
The 1-sigma error in the time of the event is 0.0 seconds.
The 1-sigma cross-track error in the shadow position is 24.5 km.
The sky-plane scale is 3836.8 km/arcsec.
Diameter estimates:
47.9 km assuming a 5% albedo, maximum of 1.9 sec for a central chord
19.5 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 43.5 km used for deployment plan.
Star training set for 15977_98MA11, (2026/07/22 03:01UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 16.34 146 Menkar 03:03:40.3 +04:11:32 2.5 12.61 161 5 Tau 03:32:20.6 +13:01:33 4.1 2.11 160 PPM 119113 03:30:27.8 +15:05:13 7.6 0.17 161 15977_98MA11 03:29:47.9 +15:02:24 16.1 161 Positions are for equinox of date
Star training set for 15977_98MA11, (2026/07/22 03:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 16.34 146 Menkar 03:02:16.8 +04:05:21 2.5 12.61 161 5 Tau 03:30:52.4 +12:56:12 4.1 2.11 160 PPM 119113 03:28:58.6 +14:59:49 7.6 0.17 161 15977_98MA11 03:28:18.8 +14:56:58 16.1 161 Positions are for J2000