Occultation event with (4791) Iphidamas, event index number 1051
Regions able to see the event: Senegal
Geocentric closest approach at 2025/06/12 04:08:03 UTC
J2000 position of star is 01:18:16.0 +30:48:44
Equinox of date position of star is 01:19:41.1 +30:56:44
Star is 119 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.5, 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 4.1 per integration for unocculted signal
Expected flux drop is 55% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 31.8 km/sec on the sky relative to the star, or, 28.6 arcsec/hr.
The recommended exposure time corresponds to 14.3 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 26.6 km.
The sky-plane scale is 4000.9 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, aximum of 1.9 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, (2025/06/12 04:08UT) Object RA Dec mag sep mel Aldebaran 04:37:23.0 +16:33:30 0.8 47.06 156 6Bet Ari 01:56:03.1 +20:55:53 2.6 12.92 123 83Tau Psc 01:13:04.1 +30:13:27 4.5 1.60 117 PPM 090641 01:18:30.0 +30:07:35 8.0 0.86 118 PPM 066109 01:16:47.7 +30:44:25 9.5 0.65 118 PPM 066119 01:17:25.3 +30:55:57 10.4 0.49 118 4791_Iphidamas 01:19:41.1 +30:56:44 15.7 119 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2025/06/12 04:08UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 47.06 156 6Bet Ari 01:54:38.6 +20:48:26 2.6 12.92 123 83Tau Psc 01:11:39.8 +30:05:22 4.5 1.60 117 PPM 090641 01:17:05.2 +29:59:34 8.0 0.86 118 PPM 066109 01:15:22.9 +30:36:23 9.5 0.65 118 PPM 066119 01:16:00.4 +30:47:55 10.4 0.49 118 4791_Iphidamas 01:18:16.0 +30:48:44 15.7 119 Positions are for J2000