Occultation event with (4833) Meges, event index number 3183
Regions able to see the event: Europe
Geocentric closest approach at 2026/01/28 21:18:38 UTC
J2000 position of star is 11:56:21.4 +38:07:33
Equinox of date position of star is 11:57:42.0 +37:58:51
Star is 85 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 7.2 per integration for unocculted signal
Expected flux drop is 32% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 18.6 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 161.8 degrees
The recommended exposure time corresponds to 19.5 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 3.7 km.
The sky-plane scale is 3504.4 km/arcsec.
Diameter estimates:
93.8 km assuming a 5% albedo, maximum of 5.0 sec for a central chord
38.3 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 80.2 km used for deployment plan.
Star training set for 4833_Meges, (2026/01/28 21:19UT) Object RA Dec mag sep mel Regulus 10:09:45.5 +11:50:19 1.3 35.54 75 Phad 11:55:11.4 +53:32:59 2.4 15.58 77 PPM 076134 11:54:28.3 +37:31:57 6.4 0.78 84 PPM 076157 11:56:43.4 +38:36:42 7.7 0.66 84 PPM 076144 11:55:25.3 +37:48:24 9.4 0.48 85 PPM 076152 11:56:27.9 +38:10:31 11.1 0.31 84 4833_Meges 11:57:42.0 +37:58:51 14.5 85 Positions are for equinox of date
Star training set for 4833_Meges, (2026/01/28 21:19UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 35.54 75 Phad 11:53:50.1 +53:41:41 2.4 15.58 77 PPM 076134 11:53:07.4 +37:40:39 6.4 0.78 84 PPM 076157 11:55:22.7 +38:45:24 7.7 0.66 84 PPM 076144 11:54:04.5 +37:57:07 9.4 0.48 85 PPM 076152 11:55:07.2 +38:19:14 11.1 0.31 84 4833_Meges 11:56:21.4 +38:07:33 14.5 85 Positions are for J2000