Occultation event with (4791) Iphidamas, event index number 1047
Regions able to see the event: Europe
Geocentric closest approach at 2025/06/11 01:41:28 UTC
J2000 position of star is 01:17:25.8 +30:42:07
Equinox of date position of star is 01:18:50.8 +30:50:07
Star is 131 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 8.6 per integration for unocculted signal
Expected flux drop is 73% with SNR of 6.3 for the occulted depth (per occulted point)
Apparent velocity is 32.1 km/sec on the sky relative to the star, or, 28.8 arcsec/hr.
The recommended exposure time corresponds to 14.4 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 27.7 km.
The sky-plane scale is 4009.8 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, aximum of 1.8 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.
Star training set for 4791_Iphidamas, (2025/06/11 01:41UT) Object RA Dec mag sep mel Aldebaran 04:37:23.0 +16:33:30 0.8 47.22 167 6Bet Ari 01:56:03.1 +20:55:53 2.6 12.95 137 83Tau Psc 01:13:04.1 +30:13:27 4.5 1.39 130 PPM 066092 01:15:45.6 +30:40:34 7.5 0.68 130 PPM 066109 01:16:47.7 +30:44:25 9.5 0.45 131 PPM 066119 01:17:25.3 +30:55:57 10.4 0.32 131 4791_Iphidamas 01:18:50.8 +30:50:07 15.7 131 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2025/06/11 01:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 47.22 167 6Bet Ari 01:54:38.6 +20:48:26 2.6 12.95 137 83Tau Psc 01:11:39.8 +30:05:22 4.5 1.39 130 PPM 066092 01:14:20.9 +30:32:31 7.5 0.68 130 PPM 066109 01:15:22.9 +30:36:23 9.5 0.45 131 PPM 066119 01:16:00.4 +30:47:55 10.4 0.32 131 4791_Iphidamas 01:17:25.8 +30:42:07 15.7 131 Positions are for J2000