Occultation event with (4805) Asteropaios, event index number 4433
Regions able to see the event: US,RECON,SwRI-CO,UVa
Geocentric closest approach at 2026/10/18 10:43:12 UTC
J2000 position of star is 04:35:09.7 +30:22:23
Equinox of date position of star is 04:36:51.7 +30:25:36
Star is 139 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.90 seconds with the standard RECON-QHY system.
SNR of 5.4 per integration for unocculted signal
Expected flux drop is 26% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 7.5 km/sec on the sky relative to the star, or, 9.0 arcsec/hr.
Position angle of asteroid motion is 84.9 degrees
The recommended exposure time corresponds to 14.2 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 32.1 km.
The sky-plane scale is 3010.3 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 7.6 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2026/10/18 10:43UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:39 0.8 13.87 136 3Iot Aur 04:58:44.6 +33:12:21 2.7 5.41 144 PPM 093607 04:36:18.9 +29:00:53 5.7 1.42 139 PPM 069546 04:38:56.6 +30:27:05 8.0 0.45 139 PPM 069513 04:36:30.9 +30:40:59 9.7 0.27 139 PPM 069515 04:36:43.0 +30:40:57 10.4 0.26 139 4805_Asteropai 04:36:51.7 +30:25:36 15.1 139 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 0.0 % chance of getting at least one chord. There is a 0.0% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| NSmith | 10:37:13 | -15.7 | AT | Down | 62.8 | 269.5 | Up | 10:33:32-10:39:32 | -197.3 | 0.000 |
This table contains the target star visibility for registered RECON 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 86.7 % chance of getting at least one chord. There is a 5.6% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Quincy | 10:43:42 | -40.9 | Dark | Down | 80.3 | 170.3 | Up | 10:40:02-10:46:02 | 218.2 | 0.000 | Reno | 10:43:30 | -40.3 | Dark | Down | 80.8 | 175.7 | Up | 10:39:48-10:45:48 | 166.2 | 0.000 | Carson City | 10:43:31 | -40.4 | Dark | Down | 81.2 | 175.7 | Up | 10:39:38-10:45:38 | 126.8 | 0.000 | Yerington | 10:43:24 | -40.1 | Dark | Down | 81.4 | 179.1 | Up | 10:40:23-10:46:23 | 100.6 | 0.008 | Gardnerville | 10:43:30 | -40.5 | Dark | Down | 81.4 | 175.8 | Up | 10:40:41-10:46:41 | 99.7 | 0.009 | Swift | 10:43:53 | -42.1 | Dark | Down | 81.5 | 164.2 | Up | 10:40:15-10:46:15 | 74.5 | 0.059 | Hawthorne | 10:43:18 | -39.9 | Dark | Down | 81.8 | 182.1 | Up | 10:40:13-10:46:13 | 45.8 | 0.242 | Lee Vining | 10:43:25 | -40.5 | Dark | Down | 82.4 | 179.2 | Up | 10:40:15-10:46:15 | -12.4 | 0.529 | Bishop | 10:43:19 | -40.3 | Dark | Down | 82.9 | 182.6 | Up | 10:40:15-10:46:15 | -68.6 | 0.084 | North Las Vegas | 10:42:43 | -38.3 | Dark | Down | 83.3 | 207.4 | Up | 10:40:13-10:46:13 | -215.6 | 0.000 |
This table contains the target star visibility for registered SwRI-CO 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 0.0 % chance of getting at least one chord. There is a 0.0% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Dunrhomin | 10:40:51 | -29.9 | Dark | Down | 75.4 | 231.5 | Up | 10:37:51-10:43:51 | 202.8 | 0.000 | TinkerMill | 10:40:51 | -29.9 | Dark | Down | 75.5 | 231.9 | Up | 10:37:52-10:43:52 | 192.2 | 0.000 | Nikitin | 10:40:51 | -30.0 | Dark | Down | 75.5 | 232.0 | Up | 10:37:51-10:43:51 | 182.7 | 0.000 | CU-SBO | 10:40:52 | -30.1 | Dark | Down | 75.6 | 232.0 | Up | 10:37:54-10:43:54 | 175.3 | 0.000 | Nederland | 10:40:54 | -30.2 | Dark | Down | 75.7 | 231.6 | Up | 10:37:51-10:43:51 | 173.3 | 0.000 |
Star training set for 4805_Asteropaios, (2026/10/18 10:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.87 136 3Iot Aur 04:56:59.6 +33:09:57 2.7 5.41 144 PPM 093607 04:34:38.0 +28:57:40 5.7 1.42 139 PPM 069546 04:37:14.5 +30:23:57 8.0 0.45 139 PPM 069513 04:34:48.7 +30:37:46 9.7 0.27 139 PPM 069515 04:35:00.8 +30:37:44 10.4 0.26 139 4805_Asteropai 04:35:09.7 +30:22:23 15.1 139 Positions are for J2000