Occultation event with (4835) Asaeus, event index number 3382
Regions able to see the event: US,SAmericaN
Geocentric closest approach at 2026/03/09 09:01:08 UTC
J2000 position of star is 14:46:35.2 +07:47:30
Equinox of date position of star is 14:47:52.6 +07:40:59
Star is 34 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 26% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 10.7 km/sec on the sky relative to the star, or, 12.9 arcsec/hr.
Position angle of asteroid motion is 160.4 degrees
The recommended exposure time corresponds to 14.4 km per image.
The 1-sigma error in the time of the event is 3.5 seconds.
The 1-sigma cross-track error in the shadow position is 0.8 km.
The sky-plane scale is 2983.6 km/arcsec.
Diameter estimates:
45.7 km assuming a 5% albedo, maximum of 4.3 sec for a central chord
18.7 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 30.2 km used for deployment plan.
Star training set for 4835_Asaeus, (2026/03/09 09:01UT) Object RA Dec mag sep mel Arcturus 14:16:51.5 +19:02:51 0.0 13.63 47 Unukalhai 15:45:33.6 +06:20:42 2.6 14.37 31 31 Boo 14:42:56.0 +08:03:04 5.8 1.28 35 PPM 160938 14:46:53.5 +08:03:01 7.8 0.44 35 PPM 160961 14:48:22.5 +08:06:01 9.9 0.44 34 4835_Asaeus 14:47:52.6 +07:40:59 15.5 34 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 100.0 % chance of getting at least one chord. There is a 0.2% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
| Ryan Obs | 09:05:37 | -27.4 | Dark | Up | 57.6 | 190.3 | Up | 09:03:39-09:09:39 | 31.5 | 0.000 | RIT | 09:06:07 | -27.2 | Dark | Up | 54.5 | 187.3 | Up | 09:03:30-09:09:30 | 15.4 | 0.002 | Naylor Obs | 09:05:41 | -27.8 | Dark | Up | 57.3 | 189.1 | Up | 09:03:04-09:09:04 | -8.6 | 1.000 |
Star training set for 4835_Asaeus, (2026/03/09 09:01UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 13.63 47 Unukalhai 15:44:16.3 +06:25:34 2.6 14.37 31 31 Boo 14:41:38.7 +08:09:42 5.8 1.28 35 PPM 160938 14:45:36.3 +08:09:34 7.8 0.44 35 PPM 160961 14:47:05.4 +08:12:31 9.9 0.44 34 4835_Asaeus 14:46:35.2 +07:47:30 15.5 34 Positions are for J2000