Occultation event with (1870) Glaukos, event index number 4458
Regions able to see the event: Europe,Senegal
Geocentric closest approach at 2026/10/23 00:25:40 UTC
J2000 position of star is 04:39:31.3 +14:57:47
Equinox of date position of star is 04:41:02.8 +15:00:50
Star is 82 degrees from the moon. Moon is 88% illuminated.
Stellar brightness G=12.5, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 15.1 per integration for unocculted signal
Expected flux drop is 95% with SNR of 14.4 for the occulted depth (per occulted point)
Apparent velocity is 10.5 km/sec on the sky relative to the star, or, 11.5 arcsec/hr.
Position angle of asteroid motion is 66.8 degrees
The recommended exposure time corresponds to 1.3 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 3279.0 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 4.3 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/10/23 00:26UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:40 0.8 1.77 81 Bellatrix 05:26:34.2 +06:22:18 1.6 14.12 92 91Sig1Tau 04:40:41.2 +15:51:02 5.3 0.84 82 PPM 120087 04:39:03.7 +15:11:53 8.0 0.51 81 PPM 120143 04:42:58.6 +14:52:23 8.8 0.49 82 PPM 120100 04:40:24.7 +14:44:40 10.5 0.31 81 1870_Glaukos 04:41:02.8 +15:00:50 15.9 82 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/10/23 00:26UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 1.77 81 Bellatrix 05:25:07.8 +06:20:58 1.6 14.12 92 91Sig1Tau 04:39:09.2 +15:47:58 5.3 0.84 82 PPM 120087 04:37:32.1 +15:08:46 8.0 0.51 81 PPM 120143 04:41:27.2 +14:49:24 8.8 0.49 82 PPM 120100 04:38:53.4 +14:41:35 10.5 0.31 81 1870_Glaukos 04:39:31.3 +14:57:47 15.9 82 Positions are for J2000