Occultation event with (1870) Glaukos, event index number 4080
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/08/23 03:14:32 UTC
J2000 position of star is 04:34:06.5 +16:10:04
Equinox of date position of star is 04:35:38.1 +16:13:18
Star is 154 degrees from the moon. Moon is 77% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.65 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 17.5 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
Position angle of asteroid motion is 92.7 degrees
The recommended exposure time corresponds to 11.3 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 30.0 km.
The sky-plane scale is 3891.6 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/08/23 03:15UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:38 0.8 0.55 155 Bellatrix 05:26:33.7 +06:22:18 1.6 15.89 156 85 Tau 04:33:23.2 +15:54:23 6.4 0.63 154 PPM 120017 04:35:09.7 +16:22:38 6.9 0.19 154 1870_Glaukos 04:35:38.1 +16:13:18 16.4 155 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/08/23 03:15UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 0.55 155 Bellatrix 05:25:07.8 +06:20:58 1.6 15.89 156 85 Tau 04:31:51.9 +15:51:05 6.4 0.63 154 PPM 120017 04:33:38.0 +16:19:23 6.9 0.19 154 1870_Glaukos 04:34:06.5 +16:10:04 16.4 154 Positions are for J2000