RECON: TNO occultation with 12AZ25

Event between 12AZ25 and star GA0900:03574708 with event index number of 2143360

Geocentric closest approach at 2026/03/30 05:06:24 UTC

J2000 position of star is 09:34:18.7 +01:38:47
Equinox of date position of star is 09:35:27.8 +01:32:47
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 16 degrees from the moon. Moon is 91% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 45.8 AU from the Sun and 45.1 AU from the Earth.
The TNO is moving 18.2 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 315 seconds.
The 1-sigma cross-track error in the shadow position is 4611 km.
The sky-plane scale is 32736.6 km/arcsec.

The TNO has an absolute magnitude Hv=5.5
Diameter=480.9 km assuming a 5% albedo -- 26.4 sec chord
Diameter=196.3 km assuming a 30% albedo -- 10.8 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 12AZ25, (2026/03/30 05:00UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:46.1 +11:50:17  1.3 13.33   5
Alphard        09:28:52.6 -08:46:25  2.0 10.44  24
32Tau2Hya      09:33:19.1 -01:18:07  4.2  2.89  18
PPM 155923     09:32:52.5 +01:20:52  7.0  0.72  17
PPM 155977     09:36:07.7 +01:29:01  9.7  0.12  16
12AZ25         09:35:40.0 +01:31:43 15.2        16
Positions are for equinox of date

This table contains the target star visibility for the RECON network. The observing range has been set to a maximum of 2.9 sigma about the mid-time.
The median site spacing is 15.2 km RECON observability=1.0 and success probability=9.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:08:16 -28.6 Dark Up 38.0 199.4 Up 04:53:16 - 05:23:16 3414
Dunrhomin 05:07:33 -38.4 Dark Up 48.8 204.4 Up 04:52:33 - 05:22:33 2831
CU-SBO 05:07:32 -38.5 Dark Up 49.1 204.3 Up 04:52:32 - 05:22:32 2811
Kamloops 05:08:56 -23.7 Dark Up 41.0 181.2 Up 04:53:56 - 05:23:56 2762
Kelowna 05:08:51 -24.7 Dark Up 41.8 182.4 Up 04:53:51 - 05:23:51 2751
Peachland 05:08:52 -24.6 Dark Up 41.9 182.0 Up 04:53:52 - 05:23:52 2732
Penticton 05:08:50 -24.8 Dark Up 42.1 182.3 Up 04:53:50 - 05:23:50 2728
Summerland 05:08:51 -24.7 Dark Up 42.0 182.1 Up 04:53:51 - 05:23:51 2727
Oliver 05:08:49 -25.1 Dark Up 42.4 182.3 Up 04:53:49 - 05:23:49 2707
Anarchist Mountain Observatory 05:08:49 -25.3 Dark Up 42.6 182.5 Up 04:53:49 - 05:23:49 2705
Tonasket 05:08:47 -25.4 Dark Up 42.9 182.4 Up 04:53:47 - 05:23:47 2683
Okanogan 05:08:48 -25.6 Dark Up 43.3 182.3 Up 04:53:48 - 05:23:48 2656
Brewster 05:08:47 -25.6 Dark Up 43.5 182.0 Up 04:53:47 - 05:23:47 2631
Manson/Chelan 05:08:48 -25.6 Dark Up 43.8 181.5 Up 04:53:48 - 05:23:48 2602
Wenatchee 05:08:48 -25.8 Dark Up 44.2 181.3 Up 04:53:48 - 05:23:48 2565
PNWRO 05:08:39 -27.4 Dark Up 45.6 183.3 Up 04:53:39 - 05:23:39 2540
Ellensburg 05:08:47 -25.9 Dark Up 44.6 181.0 Up 04:53:47 - 05:23:47 2529
Yakima 05:08:46 -26.2 Dark Up 45.1 180.9 Up 04:53:46 - 05:23:46 2503
Victoria 05:09:01 -23.5 Dark Up 43.1 177.1 Up 04:54:01 - 05:24:01 2502
Toppenish/White Swan 05:08:45 -26.4 Dark Up 45.3 181.2 Up 04:53:45 - 05:23:45 2497
Goldendale 05:08:44 -26.5 Dark Up 45.8 180.6 Up 04:53:44 - 05:23:44 2442
The Dalles 05:08:45 -26.5 Dark Up 46.1 180.0 Up 04:53:45 - 05:23:45 2411
Maupin 05:08:45 -26.8 Dark Up 46.5 180.2 Up 04:53:45 - 05:23:45 2388
Sisters 05:08:45 -27.0 Dark Up 47.3 179.5 Up 04:53:45 - 05:23:45 2307
Bend 05:08:43 -27.3 Dark Up 47.6 179.8 Up 04:53:43 - 05:23:43 2304
Oregon Observatory 05:08:43 -27.4 Dark Up 47.8 179.7 Up 04:53:43 - 05:23:43 2286
North Lake 05:08:38 -28.0 Dark Up 48.4 180.4 Up 04:53:38 - 05:23:38 2268
Lakeview 05:08:34 -29.0 Dark Up 49.5 181.3 Up 04:53:34 - 05:23:34 2222
Cedarville 05:08:33 -29.5 Dark Up 50.1 181.6 Up 04:53:33 - 05:23:33 2186
Chiloquin 05:08:41 -27.9 Dark Up 49.1 179.0 Up 04:53:41 - 05:23:41 2176
Klamath Falls 05:08:39 -28.1 Dark Up 49.4 179.1 Up 04:53:39 - 05:23:39 2157
Fall River/Burney 05:08:35 -29.0 Dark Up 50.6 179.6 Up 04:53:35 - 05:23:35 2092
Tonopah 05:08:11 -33.3 Dark Up 53.4 186.5 Up 04:53:11 - 05:23:11 2091
Susanville 05:08:30 -29.9 Dark Up 51.2 180.8 Up 04:53:30 - 05:23:30 2085
Patrick 05:07:50 -37.0 Dark Up 55.6 192.7 Up 04:52:50 - 05:22:50 2077
Reno 05:08:25 -30.9 Dark Up 52.1 182.1 Up 04:53:25 - 05:23:25 2065
Indian Springs 05:08:01 -35.2 Dark Up 54.7 189.3 Up 04:53:01 - 05:23:01 2065
Henderson 05:07:55 -36.0 Dark Up 55.2 190.6 Up 04:52:55 - 05:22:55 2063
George/Scottsdale 05:07:35 -39.4 Dark Up 56.8 196.7 Up 04:52:35 - 05:22:35 2063
Yerington 05:08:21 -31.6 Dark Up 52.6 183.2 Up 04:53:21 - 05:23:21 2058
Gimple 05:08:30 -29.9 Dark Up 51.5 180.5 Up 04:53:30 - 05:23:30 2055
Hawthorne 05:08:17 -32.2 Dark Up 53.1 184.1 Up 04:53:17 - 05:23:17 2052
Portola 05:08:28 -30.3 Dark Up 51.8 181.1 Up 04:53:28 - 05:23:28 2051
Kingman/Dolan Springs 05:07:50 -37.1 Dark Up 55.8 192.4 Up 04:52:50 - 05:22:50 2051
Greenville 05:08:30 -29.8 Dark Up 51.5 180.3 Up 04:53:30 - 05:23:30 2050
Carson City 05:08:24 -31.1 Dark Up 52.4 182.2 Up 04:53:24 - 05:23:24 2040
Quincy 05:08:31 -30.0 Dark Up 51.7 180.3 Up 04:53:31 - 05:23:31 2037
Beatty 05:08:06 -34.3 Dark Up 54.5 187.4 Up 04:53:06 - 05:23:06 2032
Gardnerville 05:08:23 -31.3 Dark Up 52.7 182.3 Up 04:53:23 - 05:23:23 2025
Laughlin/Bullhead City 05:07:52 -36.8 Dark Up 56.0 191.5 Up 04:52:52 - 05:22:52 2022
Mohave Valley 05:07:50 -36.9 Dark Up 56.2 191.6 Up 04:52:50 - 05:22:50 2002
Lee Vining 05:08:18 -32.2 Dark Up 53.6 183.3 Up 04:53:18 - 05:23:18 1987
Lake Havasu City 05:07:48 -37.3 Dark Up 56.6 192.2 Up 04:52:48 - 05:22:48 1987
Bishop 05:08:14 -33.0 Dark Up 54.2 184.6 Up 04:53:14 - 05:23:14 1981
Parker 05:07:46 -37.6 Dark Up 56.9 192.3 Up 04:52:46 - 05:22:46 1963
Yuma 05:07:43 -38.2 Dark Up 58.4 192.1 Up 04:52:43 - 05:22:43 1839
Calipatria 05:07:48 -37.4 Dark Up 58.1 190.4 Up 04:52:48 - 05:22:48 1822
Idyllwild 05:07:55 -36.2 Dark Up 57.7 188.1 Up 04:52:55 - 05:22:55 1804
Wildwood 05:08:04 -34.8 Dark Up 57.5 184.6 Up 04:53:04 - 05:23:04 1730

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 12AZ25, (2026/03/30 05:00UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 13.33   5
Alphard        09:27:35.2 -08:39:30  2.0 10.44  24
32Tau2Hya      09:31:58.9 -01:11:06  4.2  2.89  18
PPM 155923     09:31:31.3 +01:27:53  7.0  0.72  17
PPM 155977     09:34:46.4 +01:36:06  9.7  0.12  16
12AZ25         09:34:18.7 +01:38:47 15.2        16
Positions are for J2000

Event circumstances last updated at 2022/04/14 23:08:35 UT

Marc W. Buie, Southwest Research Institute

RECON