Occultation event with (4791) Iphidamas, event index number 1598
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/27 01:08:17 UTC
J2000 position of star is 01:09:02.5 +32:17:09
Equinox of date position of star is 01:10:28.7 +32:25:25
Star is 71 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 7.9 per integration for unocculted signal
Expected flux drop is 47% with SNR of 3.7 for the occulted depth (per occulted point)
Apparent velocity is 15.4 km/sec on the sky relative to the star, or, 18.3 arcsec/hr.
Position angle of asteroid motion is 22.5 degrees
The recommended exposure time corresponds to 12.3 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 5.9 km.
The sky-plane scale is 3024.4 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, aximum of 3.8 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 49.5 km used for deployment plan.
Star training set for 4791_Iphidamas, (2025/11/27 01:08UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 49.16 109 57Gam1And 02:05:30.1 +42:27:10 2.3 14.79 86 82 Psc 01:12:33.0 +31:33:42 5.2 0.97 71 PPM 066053 01:13:57.0 +32:20:52 8.3 0.74 72 PPM 065987 01:09:45.5 +32:01:52 9.7 0.42 71 4791_Iphidamas 01:10:28.7 +32:25:25 15.0 71 Positions are for equinox of date
Star training set for 4791_Iphidamas, (2025/11/27 01:08UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 49.16 109 57Gam1And 02:03:54.1 +42:19:46 2.3 14.79 86 82 Psc 01:11:06.8 +31:25:28 5.2 0.97 71 PPM 066053 01:12:30.4 +32:12:39 8.3 0.74 72 PPM 065987 01:08:19.5 +31:53:36 9.7 0.42 71 4791_Iphidamas 01:09:02.5 +32:17:09 15.0 71 Positions are for J2000