Occultation event with (1870) Glaukos, event index number 4467
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/24 00:58:14 UTC
J2000 position of star is 04:39:13.0 +14:55:55
Equinox of date position of star is 04:40:44.4 +14:58:59
Star is 68 degrees from the moon. Moon is 94% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 85% with SNR of 8.0 for the occulted depth (per occulted point)
Apparent velocity is 10.9 km/sec on the sky relative to the star, or, 11.9 arcsec/hr.
Position angle of asteroid motion is 67.5 degrees
The recommended exposure time corresponds to 2.7 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 3271.7 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/10/24 00:58UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:40 0.8 1.76 67 Bellatrix 05:26:34.2 +06:22:18 1.6 14.17 79 91Sig1Tau 04:40:41.2 +15:51:02 5.3 0.87 68 PPM 120087 04:39:03.7 +15:11:53 8.0 0.46 68 PPM 120100 04:40:24.7 +14:44:40 10.5 0.25 68 1870_Glaukos 04:40:44.4 +14:58:59 15.8 68 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/10/24 00:58UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 1.76 67 Bellatrix 05:25:07.8 +06:20:58 1.6 14.17 79 91Sig1Tau 04:39:09.2 +15:47:58 5.3 0.87 68 PPM 120087 04:37:32.1 +15:08:46 8.0 0.46 68 PPM 120100 04:38:53.4 +14:41:35 10.5 0.25 68 1870_Glaukos 04:39:13.0 +14:55:55 15.8 68 Positions are for J2000