Occultation event with (12126) 99RM11, event index number 1518
Regions able to see the event: US,RECON,SwRI-CO
Geocentric closest approach at 2025/11/15 10:50:34 UTC
J2000 position of star is 03:01:25.7 +19:21:25
Equinox of date position of star is 03:02:54.0 +19:27:28
Star is 132 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 69% with SNR of 6.4 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 74.1 degrees
The recommended exposure time corresponds to 5.3 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 24.4 km.
The sky-plane scale is 3229.4 km/arcsec.
Diameter estimates:
56.5 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
23.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 53.2 km used for deployment plan.
Star training set for 12126_99RM11, (2025/11/15 10:51UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 22.64 111 Hamal 02:08:38.3 +23:35:01 2.0 13.27 142 46Rho3Ari 02:57:54.1 +18:07:29 5.6 1.78 134 PPM 118751 03:02:39.2 +19:30:13 8.5 0.07 132 12126_99RM11 03:02:54.0 +19:27:28 15.0 132 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 81.6 % chance of getting at least one chord. There is a 64.4% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Patrick | 10:45:43 | -35.5 | Dark | Up | 31.3 | 272.7 | Really Low | 10:42:07-10:48:07 | 7.2 | 0.634 | Hodapp | 10:45:18 | -27.2 | Dark | Up | 22.9 | 278.8 | Low | 10:42:18-10:48:18 | -3.6 | 0.644 | Cobble | 10:45:19 | -27.6 | Dark | Up | 23.3 | 278.6 | Really Low | 10:42:15-10:48:15 | -12.3 | 0.590 |
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 33.3 % chance of getting at least one chord. There is a 0.4% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Lee Vining | 10:46:26 | -45.4 | Dark | Up | 41.5 | 262.6 | Up | 10:43:47-10:49:47 | 176.6 | 0.000 | Bishop | 10:46:23 | -45.1 | Dark | Up | 41.2 | 263.3 | Up | 10:43:49-10:49:49 | 128.9 | 0.000 | North Las Vegas | 10:46:11 | -42.7 | Dark | Up | 38.7 | 266.5 | Up | 10:43:46-10:49:46 | 33.3 | 0.322 | Kingman/Dolan Springs | 10:46:06 | -41.9 | Dark | Up | 37.7 | 268.1 | Up | 10:43:57-10:49:57 | -77.9 | 0.011 | Laughlin/Bullhead City | 10:46:07 | -42.3 | Dark | Up | 38.2 | 267.8 | Up | 10:43:49-10:49:49 | -85.9 | 0.004 | Lake Havasu City | 10:46:06 | -42.2 | Dark | Up | 38.0 | 268.5 | Up | 10:43:53-10:49:53 | -156.1 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|
Star training set for 12126_99RM11, (2025/11/15 10:51UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 22.64 111 Hamal 02:07:10.8 +23:27:41 2.0 13.27 142 46Rho3Ari 02:56:26.6 +18:01:18 5.6 1.78 134 PPM 118751 03:01:10.9 +19:24:10 8.5 0.07 132 12126_99RM11 03:01:25.7 +19:21:25 15.0 132 Positions are for J2000