Occultation event with (1870) Glaukos, event index number 1435
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/10/31 07:02:57 UTC
J2000 position of star is 02:11:34.7 +07:56:19
Equinox of date position of star is 02:12:56.8 +08:03:33
Star is 66 degrees from the moon. Moon is 67% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 59% with SNR of 5.2 for the occulted depth (per occulted point)
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 67.2 degrees
The recommended exposure time corresponds to 11.8 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 22.0 km.
The sky-plane scale is 3070.6 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, aximum of 2.7 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, (2025/10/31 07:03UT) Object RA Dec mag sep mel Aldebaran 04:37:24.4 +16:33:33 0.8 36.23 102 68Omi Cet 02:20:39.2 -02:51:42 2.0 11.09 65 65Xi 1Cet 02:14:22.4 +08:58:00 4.4 0.97 67 PPM 145318 02:09:41.8 +08:58:18 6.9 1.22 66 PPM 145356 02:12:22.7 +07:40:54 10.0 0.40 66 PPM 145352 02:12:10.3 +08:00:37 10.4 0.20 66 1870_Glaukos 02:12:56.8 +08:03:33 15.3 66 Positions are for equinox of date
Star training set for 1870_Glaukos, (2025/10/31 07:03UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 36.23 102 68Omi Cet 02:19:20.8 -02:58:46 2.0 11.09 65 65Xi 1Cet 02:13:00.0 +08:50:48 4.4 0.97 67 PPM 145318 02:08:19.5 +08:51:00 6.9 1.22 66 PPM 145356 02:11:00.8 +07:33:40 10.0 0.40 66 PPM 145352 02:10:48.3 +07:53:22 10.4 0.20 66 1870_Glaukos 02:11:34.7 +07:56:19 15.3 66 Positions are for J2000