Occultation event with (1647) Menelaus, event index number 4902
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/27 07:09:34 UTC
J2000 position of star is 12:41:30.5 -09:03:37
Equinox of date position of star is 12:42:54.3 -09:12:27
Star is 91 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=13.2, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.13 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 94% with SNR of 9.3 for the occulted depth (per occulted point)
Apparent velocity is 31.7 km/sec on the sky relative to the star, or, 27.9 arcsec/hr.
Position angle of asteroid motion is 114.7 degrees
The recommended exposure time corresponds to 4.1 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 25.6 km.
The sky-plane scale is 4084.1 km/arcsec.
Diameter estimates:
48.5 km assuming a 5% albedo, maximum of 1.5 sec for a central chord
19.8 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 1647_Menelaus, (2026/11/27 07:10UT) Object RA Dec mag sep mel Spica 13:26:36.9 -11:18:03 1.0 10.95 101 4Gam Crv 12:17:11.6 -17:41:28 2.6 10.53 89 21 Vir 12:35:10.2 -09:36:00 5.6 1.95 89 PPM 195726 12:42:32.7 -09:23:34 7.7 0.21 91 PPM 195732 12:42:44.9 -09:07:02 9.7 0.10 91 1647_Menelaus 12:42:54.3 -09:12:27 16.2 91 Positions are for equinox of date
Star training set for 1647_Menelaus, (2026/11/27 07:10UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 10.95 101 4Gam Crv 12:15:48.1 -17:32:30 2.6 10.53 89 21 Vir 12:33:46.6 -09:27:07 5.6 1.95 89 PPM 195726 12:41:08.9 -09:14:44 7.7 0.21 91 PPM 195732 12:41:21.2 -08:58:12 9.7 0.10 91 1647_Menelaus 12:41:30.5 -09:03:37 16.2 91 Positions are for J2000