Occultation event with (1870) Glaukos, event index number 4034
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/08/17 08:23:12 UTC
J2000 position of star is 04:31:21.3 +16:11:14
Equinox of date position of star is 04:32:52.8 +16:14:34
Star is 133 degrees from the moon. Moon is 24% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 86% with SNR of 8.0 for the occulted depth (per occulted point)
Apparent velocity is 19.9 km/sec on the sky relative to the star, or, 18.1 arcsec/hr.
Position angle of asteroid motion is 90.8 degrees
The recommended exposure time corresponds to 8.0 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 28.7 km.
The sky-plane scale is 3954.4 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/08/17 08:23UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 1.14 132 Bellatrix 05:26:33.6 +06:22:18 1.6 16.43 119 PPM 119967 04:32:05.2 +16:14:59 5.0 0.19 133 85 Tau 04:33:23.2 +15:54:23 6.4 0.36 133 PPM 119967 04:32:05.2 +16:14:59 5.0 0.19 133 PPM 119982 04:32:56.7 +16:10:20 11.0 0.07 133 1870_Glaukos 04:32:52.8 +16:14:34 16.4 133 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/08/17 08:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 1.14 132 Bellatrix 05:25:07.8 +06:20:58 1.6 16.43 119 PPM 119967 04:30:33.8 +16:11:37 5.0 0.19 133 85 Tau 04:31:51.9 +15:51:05 6.4 0.36 133 PPM 119967 04:30:33.8 +16:11:37 5.0 0.19 133 PPM 119982 04:31:25.3 +16:07:01 11.0 0.07 133 1870_Glaukos 04:31:21.3 +16:11:14 16.4 133 Positions are for J2000