RECON: TNO occultation with 535231

Event between (535231) 14YJ50 and star GA1120:03139596 with event index number of 2259164

Geocentric closest approach at 2022/01/24 09:02:50 UTC

J2000 position of star is 09:19:56.7 +22:11:17
Equinox of date position of star is 09:21:11.8 +22:05:40
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 64 degrees from the moon. Moon is 63% illuminated.
TNO apparent brightness V=22.4

[RECON map]
TNO is 36.0 AU from the Sun and 35.1 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 123 seconds.
The 1-sigma cross-track error in the shadow position is 2049 km.
The sky-plane scale is 25436.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=258.2 km assuming a 5% albedo -- 10.5 sec chord
Diameter=105.4 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 535231, (2022/01/24 09:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:32.7 +11:51:31  1.3 15.42  50
PPM 099404     09:14:52.6 +21:11:28  6.1  1.73  65
PPM 099464     09:19:01.6 +22:59:07  7.8  1.02  64
PPM 099521     09:22:59.4 +21:51:57  9.8  0.47  63
PPM 099500     09:21:34.0 +22:09:59 10.9  0.11  64
535231         09:21:12.2 +22:05:38 16.8        63
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 5.0 sigma about the mid-time.
The median site spacing is 28.2 km RECON observability=1.0 and success probability=22.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 09:02:58 -51.0 Dark Up 58.3 204.3 Up 08:52:15 - 09:13:41 -944
Kamloops 09:03:33 -57.0 Dark Up 61.5 178.5 Up 08:52:50 - 09:14:16 -1422
Kelowna 09:03:30 -57.5 Dark Up 62.3 180.2 Up 08:52:47 - 09:14:13 -1478
Peachland 09:03:30 -57.7 Dark Up 62.4 179.6 Up 08:52:47 - 09:14:13 -1495
Summerland 09:03:29 -57.8 Dark Up 62.6 179.8 Up 08:52:46 - 09:14:12 -1507
Penticton 09:03:30 -57.8 Dark Up 62.7 180.0 Up 08:52:47 - 09:14:13 -1511
Oliver 09:03:29 -58.1 Dark Up 63.0 180.0 Up 08:52:46 - 09:14:12 -1544
Anarchist Mountain Observatory 09:03:29 -58.2 Dark Up 63.2 180.4 Up 08:52:46 - 09:14:12 -1555
Tonasket 09:03:29 -58.5 Dark Up 63.5 180.2 Up 08:52:46 - 09:14:12 -1586
Okanogan 09:03:29 -58.9 Dark Up 63.8 179.9 Up 08:52:46 - 09:14:12 -1622
Brewster 09:03:28 -59.2 Dark Up 64.1 179.5 Up 08:52:45 - 09:14:11 -1652
Manson/Chelan 09:03:29 -59.5 Dark Up 64.3 178.7 Up 08:52:46 - 09:14:12 -1680
Victoria 09:03:39 -59.7 Dark Up 63.5 172.1 Up 08:52:56 - 09:14:22 -1693
Wenatchee 09:03:29 -60.0 Dark Up 64.8 178.3 Up 08:52:46 - 09:14:12 -1730
Ellensburg 09:03:29 -60.4 Dark Up 65.2 177.8 Up 08:52:46 - 09:14:12 -1775
Pasco 09:03:24 -60.7 Dark Up 65.9 180.9 Up 08:52:41 - 09:14:07 -1812
Yakima 09:03:29 -60.8 Dark Up 65.6 177.7 Up 08:52:46 - 09:14:12 -1814
PNWRO 09:03:22 -60.8 Dark Up 66.2 181.5 Up 08:52:39 - 09:14:05 -1830
Toppenish/White Swan 09:03:28 -60.9 Dark Up 65.8 178.1 Up 08:52:45 - 09:14:11 -1831
Goldendale 09:03:29 -61.6 Dark Up 66.3 177.1 Up 08:52:46 - 09:14:12 -1895
The Dalles 09:03:29 -61.9 Dark Up 66.6 176.2 Up 08:52:46 - 09:14:12 -1926
Maupin 09:03:28 -62.2 Dark Up 67.0 176.4 Up 08:52:45 - 09:14:11 -1964
Dunrhomin 09:02:32 -58.4 Dark Up 68.3 217.8 Up 08:51:49 - 09:13:15 -1979
Redmond 09:03:28 -63.1 Dark Up 67.9 176.0 Up 08:52:45 - 09:14:11 -2055
Sisters 09:03:29 -63.2 Dark Up 67.8 175.0 Up 08:52:46 - 09:14:12 -2062
Bend 09:03:28 -63.3 Dark Up 68.1 175.6 Up 08:52:45 - 09:14:11 -2079
Oregon Observatory 09:03:29 -63.5 Dark Up 68.2 175.3 Up 08:52:46 - 09:14:12 -2100
La Pine/Gilchrist 09:03:28 -63.7 Dark Up 68.4 175.1 Up 08:52:45 - 09:14:11 -2121
North Lake 09:03:26 -63.9 Dark Up 68.9 176.5 Up 08:52:43 - 09:14:09 -2149
Paisley 09:03:24 -64.3 Dark Up 69.5 177.3 Up 08:52:41 - 09:14:07 -2195
Chiloquin 09:03:28 -64.8 Dark Up 69.5 173.9 Up 08:52:45 - 09:14:11 -2240
Lakeview 09:03:23 -64.7 Dark Up 70.0 177.8 Up 08:52:40 - 09:14:06 -2241
Klamath Falls 09:03:28 -65.1 Dark Up 69.9 174.0 Up 08:52:45 - 09:14:11 -2273
Cedarville 09:03:21 -65.2 Dark Up 70.7 178.2 Up 08:52:38 - 09:14:04 -2301
Fall River/Burney 09:03:25 -66.0 Dark Up 71.1 174.7 Up 08:52:42 - 09:14:08 -2381
Susanville 09:03:22 -66.3 Dark Up 71.7 176.7 Up 08:52:39 - 09:14:05 -2426
Gimple 09:03:22 -66.6 Dark Up 72.0 176.0 Up 08:52:39 - 09:14:05 -2459
Greenville 09:03:22 -66.7 Dark Up 72.0 175.7 Up 08:52:39 - 09:14:05 -2461
Quincy 09:03:22 -66.9 Dark Up 72.2 175.7 Up 08:52:39 - 09:14:05 -2481
Portola 09:03:20 -66.8 Dark Up 72.4 177.1 Up 08:52:37 - 09:14:03 -2481
Reno 09:03:17 -66.7 Dark Up 72.6 179.0 Up 08:52:34 - 09:14:00 -2491
Carson City 09:03:17 -67.0 Dark Up 73.0 179.1 Up 08:52:34 - 09:14:00 -2527
Yerington 09:03:14 -66.9 Dark Up 73.2 181.1 Up 08:52:31 - 09:13:57 -2529
Gardnerville 09:03:16 -67.2 Dark Up 73.2 179.2 Up 08:52:33 - 09:13:59 -2550
Hawthorne 09:03:12 -67.1 Dark Up 73.6 182.8 Up 08:52:29 - 09:13:55 -2561
Tonopah 09:03:07 -66.8 Dark Up 74.0 187.6 Up 08:52:24 - 09:13:50 -2568
Lee Vining 09:03:13 -67.8 Dark Up 74.2 181.3 Up 08:52:30 - 09:13:56 -2632
Beatty 09:03:04 -67.4 Dark Up 75.1 189.7 Up 08:52:21 - 09:13:47 -2672
Bishop 09:03:10 -67.9 Dark Up 74.8 183.8 Up 08:52:27 - 09:13:53 -2672
Indian Springs 09:03:00 -67.0 Dark Up 75.3 193.8 Up 08:52:17 - 09:13:43 -2672
Henderson 09:02:57 -67.0 Dark Up 75.6 196.8 Up 08:52:14 - 09:13:40 -2705
Patrick 09:02:52 -66.8 Dark Up 75.9 201.5 Up 08:52:09 - 09:13:35 -2734
Kingman/Dolan Springs 09:02:52 -67.0 Dark Up 76.2 201.2 Up 08:52:09 - 09:13:35 -2762
Laughlin/Bullhead City 09:02:53 -67.4 Dark Up 76.4 199.3 Up 08:52:10 - 09:13:36 -2781
Mohave Valley 09:02:53 -67.5 Dark Up 76.6 199.7 Up 08:52:10 - 09:13:36 -2808
George/Scottsdale 09:02:41 -66.4 Dark Up 76.7 211.8 Up 08:51:58 - 09:13:24 -2839
Lake Havasu City 09:02:52 -67.6 Dark Up 76.9 201.2 Up 08:52:09 - 09:13:35 -2841
Parker 09:02:51 -67.8 Dark Up 77.2 201.9 Up 08:52:08 - 09:13:34 -2875
Blythe 09:02:51 -68.3 Dark Up 77.8 201.6 Up 08:52:08 - 09:13:34 -2938
CPSLO 09:03:14 -70.6 Dark Up 76.8 175.2 Up 08:52:31 - 09:13:57 -2947
Idyllwild 09:02:59 -69.6 Dark Up 78.2 192.4 Up 08:52:16 - 09:13:42 -2992
Wildwood 09:03:06 -70.5 Dark Up 78.1 183.8 Up 08:52:23 - 09:13:49 -3012
Calipatria 09:02:54 -69.2 Dark Up 78.5 198.4 Up 08:52:11 - 09:13:37 -3018
Yuma 09:02:49 -68.9 Dark Up 78.7 203.1 Up 08:52:06 - 09:13:32 -3033

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 535231, (2022/01/24 09:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 15.42  50
PPM 099404     09:13:37.2 +21:16:59  6.1  1.73  65
PPM 099464     09:17:45.6 +23:04:44  7.8  1.02  64
PPM 099521     09:21:44.1 +21:57:39  9.8  0.47  63
PPM 099500     09:20:18.5 +22:15:39 10.9  0.11  64
535231         09:19:56.7 +22:11:17 16.8        64
Positions are for J2000

Event circumstances last updated at 2021/12/06 01:46:01 UT

Marc W. Buie, Southwest Research Institute

RECON