Occultation event with (16974) Iphthime, event index number 736
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/02/28 05:31:13 UTC
J2000 position of star is 08:37:40.2 +00:26:52
Equinox of date position of star is 08:38:57.7 +00:21:31
Star is 144 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
Expected flux drop is 57% with SNR of 7.4 per integration
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
The recommended exposure time corresponds to 15.2 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 21.7 km.
The sky-plane scale is 3239.4 km/arcsec.
Diameter estimates:
61.7 km assuming a 5% albedo, aximum of 4.3 sec for a central chord
25.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 16974_Iphthime, (2025/02/28 05:31UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 25.28 167 Alphard 09:28:49.4 -08:46:08 2.0 15.41 152 PPM 177501 08:35:17.9 -02:14:21 6.4 2.75 143 PPM 154788 08:39:38.0 +00:36:06 8.0 0.30 144 PPM 154783 08:39:33.3 +00:29:49 9.6 0.20 144 16974_Iphthime 08:38:57.7 +00:21:31 15.1 145 Positions are for equinox of date
Star training set for 16974_Iphthime, (2025/02/28 05:31UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 25.28 167 Alphard 09:27:35.2 -08:39:30 2.0 15.41 152 PPM 177501 08:34:01.6 -02:09:06 6.4 2.75 143 PPM 154788 08:38:20.3 +00:41:28 8.0 0.30 144 PPM 154783 08:38:15.7 +00:35:11 9.6 0.20 144 16974_Iphthime 08:37:40.2 +00:26:52 15.1 144 Positions are for J2000