Occultation event with (1870) Glaukos, event index number 1168
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/25 17:35:51 UTC
J2000 position of star is 02:24:33.4 +10:51:37
Equinox of date position of star is 02:25:55.9 +10:58:30
Star is 98 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=12.5, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 15.7 per integration for unocculted signal
Expected flux drop is 97% with SNR of 15.2 for the occulted depth (per occulted point)
Apparent velocity is 15.2 km/sec on the sky relative to the star, or, 14.6 arcsec/hr.
The recommended exposure time corresponds to 1.8 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 10.8 km.
The sky-plane scale is 3757.8 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, aximum of 3.0 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 45.5 km used for deployment plan.
Star training set for 1870_Glaukos, (2025/07/25 17:36UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 32.37 66 Menkar 03:03:37.1 +04:11:19 2.5 11.54 91 24Xi Ari 02:26:11.5 +10:43:30 5.5 0.26 98 PPM 118174 02:24:36.5 +10:57:07 8.4 0.33 98 24Xi Ari 02:26:11.5 +10:43:30 5.5 0.26 98 1870_Glaukos 02:25:55.9 +10:58:30 16.3 97 Positions are for equinox of date
Star training set for 1870_Glaukos, (2025/07/25 17:36UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 32.37 66 Menkar 03:02:16.8 +04:05:21 2.5 11.54 91 24Xi Ari 02:24:49.1 +10:36:38 5.5 0.26 98 PPM 118174 02:23:14.1 +10:50:12 8.4 0.33 98 24Xi Ari 02:24:49.1 +10:36:38 5.5 0.26 98 1870_Glaukos 02:24:33.4 +10:51:37 16.3 98 Positions are for J2000