Occultation event with (16974) Iphthime, event index number 3848
Regions able to see the event: NZ
Geocentric closest approach at 2026/07/15 07:35:13 UTC
J2000 position of star is 10:53:49.0 -06:32:23
Equinox of date position of star is 10:55:09.4 -06:40:53
Star is 44 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 45% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 29.8 km/sec on the sky relative to the star, or, 24.6 arcsec/hr.
Position angle of asteroid motion is 101.2 degrees
The recommended exposure time corresponds to 19.3 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 53.0 km.
The sky-plane scale is 4357.4 km/arcsec.
Diameter estimates:
62.2 km assuming a 5% albedo, maximum of 2.1 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, (2026/07/15 07:35UT) Object RA Dec mag sep mel Regulus 10:09:47.0 +11:50:11 1.3 21.68 24 Alphard 09:28:53.5 -08:46:30 2.0 21.47 32 PPM 193828 10:51:03.2 -09:59:38 5.5 3.46 45 PPM 193890 10:54:09.0 -06:57:54 7.5 0.38 44 PPM 193920 10:55:36.4 -06:46:40 9.4 0.15 44 16974_Iphthime 10:55:09.4 -06:40:53 15.9 44 Positions are for equinox of date
Star training set for 16974_Iphthime, (2026/07/15 07:35UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.68 24 Alphard 09:27:35.2 -08:39:30 2.0 21.47 32 PPM 193828 10:49:43.5 -09:51:10 5.5 3.46 45 PPM 193890 10:52:48.6 -06:49:24 7.5 0.38 44 PPM 193920 10:54:16.0 -06:38:10 9.4 0.15 44 16974_Iphthime 10:53:49.0 -06:32:23 15.9 44 Positions are for J2000