Occultation event with (1870) Glaukos, event index number 4795
Regions able to see the event: SMexico
Geocentric closest approach at 2026/11/21 05:26:02 UTC
J2000 position of star is 04:26:58.9 +14:04:28
Equinox of date position of star is 04:28:29.9 +14:07:59
Star is 55 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 30% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
Position angle of asteroid motion is 77.5 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 28.7 km.
The sky-plane scale is 3147.8 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 47.6 km used for deployment plan.
Star training set for 1870_Glaukos, (2026/11/21 05:26UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 3.25 57 Bellatrix 05:26:34.5 +06:22:18 1.6 16.25 70 73Pi Tau 04:28:07.9 +14:46:21 5.8 0.65 55 PPM 119947 04:31:03.9 +13:57:06 8.5 0.65 56 PPM 119899 04:28:10.0 +14:16:47 9.0 0.17 55 1870_Glaukos 04:28:29.9 +14:07:59 15.5 55 Positions are for equinox of date
Star training set for 1870_Glaukos, (2026/11/21 05:26UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 3.25 57 Bellatrix 05:25:07.8 +06:20:58 1.6 16.25 70 73Pi Tau 04:26:36.5 +14:42:49 5.8 0.65 55 PPM 119947 04:29:33.0 +13:53:41 8.5 0.65 56 PPM 119899 04:26:38.9 +14:13:16 9.0 0.17 55 1870_Glaukos 04:26:58.9 +14:04:28 15.5 55 Positions are for J2000