Occultation event with (1870) Glaukos, event index number 1201
Regions able to see the event: SMexico
Geocentric closest approach at 2025/07/15 10:36:28 UTC
J2000 position of star is 02:20:01.1 +10:40:09
Equinox of date position of star is 02:21:23.4 +10:47:07
Star is 47 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 64% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 19.7 km/sec on the sky relative to the star, or, 18.3 arcsec/hr.
The recommended exposure time corresponds to 10.8 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 14.2 km.
The sky-plane scale is 3869.8 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, aximum of 2.3 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 45.5 km used for deployment plan.
Star training set for 1870_Glaukos, (2025/07/15 10:36UT) Object RA Dec mag sep mel Aldebaran 04:37:23.3 +16:33:31 0.8 33.49 80 6Bet Ari 01:56:03.4 +20:55:54 2.6 11.83 45 24Xi Ari 02:26:11.4 +10:43:30 5.5 1.18 48 PPM 118174 02:24:36.5 +10:57:06 8.4 0.81 47 PPM 118144 02:22:16.3 +10:43:38 8.9 0.22 47 PPM 118136 02:21:51.1 +10:45:24 10.3 0.12 47 1870_Glaukos 02:21:23.4 +10:47:07 16.3 47 Positions are for equinox of date
Star training set for 1870_Glaukos, (2025/07/15 10:36UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 33.49 80 6Bet Ari 01:54:38.6 +20:48:26 2.6 11.83 45 24Xi Ari 02:24:49.1 +10:36:38 5.5 1.18 48 PPM 118174 02:23:14.1 +10:50:12 8.4 0.81 47 PPM 118144 02:20:54.0 +10:36:41 8.9 0.22 47 PPM 118136 02:20:28.9 +10:38:27 10.3 0.12 47 1870_Glaukos 02:20:01.1 +10:40:09 16.3 47 Positions are for J2000