Occultation event with (1870) Glaukos, event index number 3920
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/08/01 10:31:36 UTC
J2000 position of star is 04:22:15.3 +16:08:10
Equinox of date position of star is 04:23:46.5 +16:11:49
Star is 85 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 55% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 26.2 km/sec on the sky relative to the star, or, 22.9 arcsec/hr.
Position angle of asteroid motion is 87.0 degrees
The recommended exposure time corresponds to 18.3 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 28.5 km.
The sky-plane scale is 4118.6 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/08/01 10:32UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 3.30 88 44Zet Per 03:55:48.6 +31:57:37 2.8 16.99 81 63 Tau 04:24:56.8 +16:50:13 6.0 0.70 85 PPM 119842 04:24:58.5 +16:41:22 8.0 0.57 85 PPM 119823 04:23:29.8 +15:50:45 10.0 0.36 85 1870_Glaukos 04:23:46.5 +16:11:49 16.4 85 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/08/01 10:32UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 3.30 88 44Zet Per 03:54:07.9 +31:53:01 2.8 16.99 81 63 Tau 04:23:25.3 +16:46:37 6.0 0.70 85 PPM 119842 04:23:27.0 +16:37:46 8.0 0.57 85 PPM 119823 04:21:58.9 +15:47:05 10.0 0.36 85 1870_Glaukos 04:22:15.3 +16:08:10 16.4 85 Positions are for J2000