Occultation event with (9857) Hecamede, event index number 763
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/03/06 04:42:59 UTC
J2000 position of star is 09:45:46.8 -04:27:19
Equinox of date position of star is 09:47:02.8 -04:34:20
Star is 83 degrees from the moon. Moon is 45% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
Expected flux drop is 17% with SNR of 9.9 per integration
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
The recommended exposure time corresponds to 3.3 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 28.0 km.
The sky-plane scale is 3144.6 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, aximum of 3.1 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 51.3 km used for deployment plan.
Star training set for 9857_Hecamede, (2025/03/06 04:43UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:35 1.3 17.36 80 Alphard 09:28:49.5 -08:46:08 2.0 6.17 81 33 Hya 09:35:48.0 -06:01:43 5.6 3.16 81 PPM 192687 09:45:46.3 -04:46:26 8.2 0.38 82 PPM 192708 09:47:00.1 -04:33:34 9.3 0.02 83 9857_Hecamede 09:47:02.8 -04:34:20 15.3 83 Positions are for equinox of date
Star training set for 9857_Hecamede, (2025/03/06 04:43UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 17.36 80 Alphard 09:27:35.2 -08:39:30 2.0 6.17 81 33 Hya 09:34:32.7 -05:54:56 5.6 3.16 81 PPM 192687 09:44:30.4 -04:39:26 8.2 0.38 82 PPM 192708 09:45:44.1 -04:26:33 9.3 0.02 83 9857_Hecamede 09:45:46.8 -04:27:19 15.3 83 Positions are for J2000