Occultation event with (4791) Iphidamas, event index number 1167
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/24 17:02:38 UTC
J2000 position of star is 01:43:02.7 +34:45:04
Equinox of date position of star is 01:44:31.7 +34:52:44
Star is 83 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.3 per integration for unocculted signal
Expected flux drop is 93% with SNR of 12.4 for the occulted depth (per occulted point)
Apparent velocity is 16.6 km/sec on the sky relative to the star, or, 16.6 arcsec/hr.
The recommended exposure time corresponds to 2.0 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 31.5 km.
The sky-plane scale is 3595.6 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.
Star training set for 4791_Iphidamas, (2025/07/24 17:03UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 42.60 52 57Gam1And 02:05:28.8 +42:27:04 2.3 8.60 76 PPM 066538 01:43:32.7 +35:22:25 5.6 0.53 83 PPM 066512 01:41:54.7 +34:28:02 8.3 0.68 84 PPM 066533 01:43:11.2 +34:50:20 9.5 0.28 83 PPM 066542 01:43:37.7 +34:53:51 10.4 0.19 83 4791_Iphidamas 01:44:31.7 +34:52:44 15.5 83 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2025/07/24 17:03UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 42.60 52 57Gam1And 02:03:54.1 +42:19:46 2.3 8.60 76 PPM 066538 01:42:03.6 +35:14:44 5.6 0.53 83 PPM 066512 01:40:26.1 +34:20:19 8.3 0.68 84 PPM 066533 01:41:42.4 +34:42:39 9.5 0.28 83 PPM 066542 01:42:08.8 +34:46:10 10.4 0.19 83 4791_Iphidamas 01:43:02.7 +34:45:04 15.5 83 Positions are for J2000