Occultation event with (4791) Iphidamas, event index number 4841
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/23 21:24:09 UTC
J2000 position of star is 04:24:28.0 +30:01:28
Equinox of date position of star is 04:26:09.7 +30:05:04
Star is 18 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 27% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 18.3 km/sec on the sky relative to the star, or, 23.0 arcsec/hr.
Position angle of asteroid motion is 63.7 degrees
The recommended exposure time corresponds to 11.9 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 30.1 km.
The sky-plane scale is 2857.3 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 49.5 km used for deployment plan.
Star training set for 4791_Iphidamas, (2026/11/23 21:24UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 13.77 21 44Zet Per 03:55:49.8 +31:57:40 2.8 6.76 13 PPM 069410 04:27:49.4 +31:29:50 5.3 1.46 19 PPM 093434 04:22:18.6 +28:57:15 8.0 1.41 17 PPM 069390 04:26:09.1 +30:11:04 9.3 0.10 18 4791_Iphidamas 04:26:09.7 +30:05:04 14.5 18 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2026/11/23 21:24UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.77 21 44Zet Per 03:54:07.9 +31:53:01 2.8 6.76 13 PPM 069410 04:26:06.4 +31:26:18 5.3 1.46 19 PPM 093434 04:20:37.8 +28:53:31 8.0 1.41 17 PPM 069390 04:24:27.2 +30:07:27 9.3 0.10 18 4791_Iphidamas 04:24:28.0 +30:01:28 14.5 18 Positions are for J2000