Occultation event with (4791) Iphidamas, event index number 3188
Regions able to see the event: US
Geocentric closest approach at 2026/01/30 22:43:00 UTC
J2000 position of star is 01:24:46.2 +27:15:35
Equinox of date position of star is 01:26:13.0 +27:23:42
Star is 74 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 72% with SNR of 7.0 for the occulted depth (per occulted point)
Apparent velocity is 22.1 km/sec on the sky relative to the star, or, 21.9 arcsec/hr.
Position angle of asteroid motion is 101.6 degrees
The recommended exposure time corresponds to 11.1 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 26.6 km.
The sky-plane scale is 3639.2 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 49.5 km used for deployment plan.
Star training set for 4791_Iphidamas, (2026/01/30 22:43UT) Object RA Dec mag sep mel Aldebaran 04:37:25.2 +16:33:34 0.8 45.35 36 6Bet Ari 01:56:05.2 +20:56:04 2.6 9.38 70 90Ups Psc 01:20:54.4 +27:24:01 4.8 1.18 75 PPM 090789 01:28:10.7 +27:22:51 7.3 0.44 74 PPM 090751 01:25:51.6 +27:42:52 9.2 0.33 74 PPM 090747 01:25:41.3 +27:26:58 10.2 0.13 74 4791_Iphidamas 01:26:13.0 +27:23:42 15.5 74 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2026/01/30 22:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 45.35 36 6Bet Ari 01:54:38.6 +20:48:26 2.6 9.38 70 90Ups Psc 01:19:28.0 +27:15:50 4.8 1.18 75 PPM 090789 01:26:43.8 +27:14:46 7.3 0.44 74 PPM 090751 01:24:24.7 +27:34:45 9.2 0.33 74 PPM 090747 01:24:14.5 +27:18:51 10.2 0.13 74 4791_Iphidamas 01:24:46.2 +27:15:35 15.5 74 Positions are for J2000