Occultation event with (1870) Glaukos, event index number 1258
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/29 18:39:40 UTC
J2000 position of star is 02:31:38.0 +10:42:56
Equinox of date position of star is 02:33:00.9 +10:49:41
Star is 166 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=16.9, apparent brightess of occulting body is G=16.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.4 per integration for unocculted signal
Expected flux drop is 31% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 3.1 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
Position angle of asteroid motion is 2.9 degrees
The recommended exposure time corresponds to 6.2 km per image.
The 1-sigma error in the time of the event is 8.5 seconds.
The 1-sigma cross-track error in the shadow position is 5.1 km.
The sky-plane scale is 3383.8 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, aximum of 14.6 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 6.0 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2025/08/29 18:40UT) Object RA Dec mag sep mel Aldebaran 04:37:23.8 +16:33:31 0.8 30.71 158 Menkar 03:03:37.4 +04:11:20 2.5 10.08 162 PPM 118239 02:28:45.5 +10:18:39 6.4 1.17 165 PPM 118344 02:35:49.3 +11:42:58 6.7 1.12 167 PPM 118308 02:33:18.4 +11:13:21 9.8 0.40 166 PPM 118299 02:32:43.9 +10:51:34 10.6 0.08 166 1870_Glaukos 02:33:00.9 +10:49:41 16.0 166 Positions are for equinox of date
Star training set for 1870_Glaukos, (2025/08/29 18:40UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.71 158 Menkar 03:02:16.8 +04:05:21 2.5 10.08 162 PPM 118239 02:27:22.9 +10:11:48 6.4 1.17 165 PPM 118344 02:34:26.0 +11:36:17 6.7 1.12 167 PPM 118308 02:31:55.3 +11:06:36 9.8 0.40 166 PPM 118299 02:31:21.0 +10:44:49 10.6 0.08 166 1870_Glaukos 02:31:38.0 +10:42:56 16.0 166 Positions are for J2000