Occultation event with (16974) Iphthime, event index number 3836
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/09 00:19:05 UTC
J2000 position of star is 10:49:50.5 -06:21:38
Equinox of date position of star is 10:51:10.8 -06:30:05
Star is 134 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=13.3, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.14 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 92% with SNR of 8.8 for the occulted depth (per occulted point)
Apparent velocity is 27.7 km/sec on the sky relative to the star, or, 23.2 arcsec/hr.
Position angle of asteroid motion is 99.4 degrees
The recommended exposure time corresponds to 3.9 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 53.3 km.
The sky-plane scale is 4298.0 km/arcsec.
Diameter estimates:
62.2 km assuming a 5% albedo, maximum of 2.2 sec for a central chord
25.4 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 16974_Iphthime, (2026/07/09 00:19UT) Object RA Dec mag sep mel Regulus 10:09:46.9 +11:50:12 1.3 21.03 117 Alphard 09:28:53.4 -08:46:29 2.0 20.51 115 PPM 193861 10:52:26.3 -03:14:02 5.8 3.28 133 PPM 193890 10:54:08.9 -06:57:53 7.5 0.87 135 PPM 193823 10:50:49.9 -06:44:29 9.5 0.26 134 16974_Iphthime 10:51:10.8 -06:30:05 15.9 134 Positions are for equinox of date
Star training set for 16974_Iphthime, (2026/07/09 00:19UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.03 117 Alphard 09:27:35.2 -08:39:30 2.0 20.51 115 PPM 193861 10:51:05.3 -03:05:34 5.8 3.28 133 PPM 193890 10:52:48.6 -06:49:24 7.5 0.87 135 PPM 193823 10:49:29.6 -06:36:02 9.5 0.26 134 16974_Iphthime 10:49:50.5 -06:21:38 15.9 134 Positions are for J2000