Occultation event with (16974) Iphthime, event index number 3510
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/03/26 18:32:49 UTC
J2000 position of star is 10:33:32.0 -09:41:44
Equinox of date position of star is 10:34:50.5 -09:49:53
Star is 58 degrees from the moon. Moon is 61% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 62% with SNR of 6.2 for the occulted depth (per occulted point)
Apparent velocity is 16.0 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
Position angle of asteroid motion is 126.8 degrees
The recommended exposure time corresponds to 9.6 km per image.
The 1-sigma error in the time of the event is 3.2 seconds.
The 1-sigma cross-track error in the shadow position is 33.2 km.
The sky-plane scale is 3316.1 km/arcsec.
Diameter estimates:
62.2 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
25.4 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 16974_Iphthime, (2026/03/26 18:33UT) Object RA Dec mag sep mel Regulus 10:09:46.0 +11:50:17 1.3 22.55 41 Alphard 09:28:52.6 -08:46:25 2.0 16.31 46 PPM 193503 10:32:17.6 -07:46:22 6.2 2.15 57 PPM 193556 10:35:36.5 -10:02:07 8.0 0.28 59 PPM 193544 10:34:57.2 -09:54:37 9.4 0.08 58 16974_Iphthime 10:34:50.5 -09:49:53 15.1 59 Positions are for equinox of date
Star training set for 16974_Iphthime, (2026/03/26 18:33UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 22.55 41 Alphard 09:27:35.2 -08:39:30 2.0 16.31 46 PPM 193503 10:30:58.7 -07:38:15 6.2 2.15 57 PPM 193556 10:34:18.1 -09:53:58 8.0 0.28 59 PPM 193544 10:33:38.8 -09:46:28 9.4 0.08 58 16974_Iphthime 10:33:32.0 -09:41:44 15.1 58 Positions are for J2000