Occultation event with (1647) Menelaus, event index number 3464
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/19 04:01:11 UTC
J2000 position of star is 10:29:54.1 +02:07:15
Equinox of date position of star is 10:31:15.2 +01:59:09
Star is 158 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 72% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 15.1 km/sec on the sky relative to the star, or, 18.0 arcsec/hr.
Position angle of asteroid motion is 116.7 degrees
The recommended exposure time corresponds to 5.3 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 22.2 km.
The sky-plane scale is 3004.3 km/arcsec.
Diameter estimates:
48.5 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
19.8 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 1647_Menelaus, (2026/03/19 04:01UT) Object RA Dec mag sep mel Regulus 10:09:45.9 +11:50:17 1.3 11.20 150 30Bet Sex 10:31:37.9 -00:46:20 4.8 2.76 158 PPM 156907 10:31:52.2 +02:00:53 7.6 0.16 158 1647_Menelaus 10:31:15.2 +01:59:09 15.3 158 Positions are for equinox of date
Star training set for 1647_Menelaus, (2026/03/19 04:01UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 11.20 150 30Bet Sex 10:30:17.4 -00:38:14 4.8 2.76 158 PPM 156907 10:30:31.1 +02:08:59 7.6 0.16 158 1647_Menelaus 10:29:54.1 +02:07:15 15.3 158 Positions are for J2000