Occultation event with (1870) Glaukos, event index number 4638
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/10 21:04:00 UTC
J2000 position of star is 04:32:10.3 +14:22:48
Equinox of date position of star is 04:33:41.4 +14:26:08
Star is 167 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.6 per integration for unocculted signal
Expected flux drop is 92% with SNR of 10.7 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 17.8 arcsec/hr.
Position angle of asteroid motion is 75.0 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 27.6 km.
The sky-plane scale is 3174.6 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 2.9 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/11/10 21:04UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 2.31 169 Bellatrix 05:26:34.4 +06:22:18 1.6 15.29 154 86Rho Tau 04:35:22.6 +14:53:55 4.6 0.62 168 PPM 119977 04:32:42.3 +14:44:45 8.5 0.39 168 PPM 119989 04:33:18.9 +14:12:37 10.4 0.24 167 1870_Glaukos 04:33:41.4 +14:26:08 15.6 167 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/11/10 21:04UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 2.31 169 Bellatrix 05:25:07.8 +06:20:58 1.6 15.29 154 86Rho Tau 04:33:51.1 +14:50:39 4.6 0.62 168 PPM 119977 04:31:11.0 +14:41:23 8.5 0.39 168 PPM 119989 04:31:47.9 +14:09:16 10.4 0.24 167 1870_Glaukos 04:32:10.3 +14:22:48 15.6 167 Positions are for J2000