Occultation event with (4791) Iphidamas, event index number 3954
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/07 09:17:52 UTC
J2000 position of star is 04:23:37.1 +31:50:59
Equinox of date position of star is 04:25:19.1 +31:54:35
Star is 9 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 4.4 per integration for unocculted signal
Expected flux drop is 52% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 24.3 km/sec on the sky relative to the star, or, 23.0 arcsec/hr.
Position angle of asteroid motion is 83.5 degrees
The recommended exposure time corresponds to 12.2 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 28.7 km.
The sky-plane scale is 3805.6 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 2.4 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 49.5 km used for deployment plan.
Star training set for 4791_Iphidamas, (2026/08/07 09:18UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 15.59 13 44Zet Per 03:55:48.7 +31:57:37 2.8 6.26 6 PPM 069410 04:27:48.2 +31:29:48 5.3 0.67 9 PPM 069366 04:24:16.4 +32:31:43 8.5 0.66 9 PPM 069384 04:25:46.4 +31:54:53 9.5 0.10 9 4791_Iphidamas 04:25:19.1 +31:54:35 15.6 9 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2026/08/07 09:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 15.59 13 44Zet Per 03:54:07.9 +31:53:01 2.8 6.26 6 PPM 069410 04:26:06.4 +31:26:18 5.3 0.67 9 PPM 069366 04:22:33.9 +32:28:05 8.5 0.66 9 PPM 069384 04:24:04.3 +31:51:19 9.5 0.10 9 4791_Iphidamas 04:23:37.1 +31:50:59 15.6 9 Positions are for J2000