RECON: TNO occultation with 535988

Event between (535988) 15BU518 and star GA0720:05530387 with event index number of 1619293

Geocentric closest approach at 2026/04/30 10:20:35 UTC

J2000 position of star is 15:27:58.4 -17:12:09
Equinox of date position of star is 15:29:04.8 -17:16:09
Stellar brightness G=14.6, use SENSEUP=128
Star is 29 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 33.4 AU from the Sun and 32.4 AU from the Earth.
The TNO is moving 23.0 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 185 seconds.
The 1-sigma cross-track error in the shadow position is 2572 km.
The sky-plane scale is 23513.5 km/arcsec.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 8.3 sec chord
Diameter=77.8 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 535988, (2026/04/30 10:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.6 -26:29:17  0.9 16.96  44
27Bet Lib      15:18:25.7 -09:28:42  2.6  8.26  27
32Zet1Lib      15:29:44.8 -16:48:23  5.6  0.49  29
PPM 230220     15:26:55.2 -17:11:07  8.4  0.62  28
PPM 230279     15:29:14.4 -17:14:38  9.4  0.07  29
535988         15:29:28.0 -17:17:33 14.6        29
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 4.9 sigma about the mid-time.
The median site spacing is 12.7 km RECON observability=1.0 and success probability=7.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 10:20:21 -17.8 AT Up 20.1 202.5 Low 10:05:21 - 10:35:21 2766
Summerland 10:20:21 -18.1 Dark Up 20.5 202.3 Low 10:05:21 - 10:35:21 2753
Penticton 10:20:21 -18.1 Dark Up 20.5 202.4 Low 10:05:21 - 10:35:21 2752
Okanagan Falls 10:20:20 -18.3 Dark Up 20.7 202.4 Low 10:05:20 - 10:35:20 2744
Oliver 10:20:20 -18.4 Dark Up 20.8 202.4 Low 10:05:20 - 10:35:20 2738
Anarchist Mountain Observatory 10:20:19 -18.5 Dark Up 20.9 202.6 Low 10:05:19 - 10:35:19 2732
Oroville 10:20:20 -18.6 Dark Up 21.0 202.6 Low 10:05:20 - 10:35:20 2729
Tonasket 10:20:19 -18.7 Dark Up 21.2 202.6 Low 10:05:19 - 10:35:19 2720
Okanogan 10:20:19 -19.1 Dark Up 21.6 202.5 Low 10:05:19 - 10:35:19 2705
Brewster 10:20:19 -19.4 Dark Up 21.9 202.3 Low 10:05:19 - 10:35:19 2693
Manson/Chelan 10:20:20 -19.7 Dark Up 22.2 202.0 Low 10:05:20 - 10:35:20 2682
Wenatchee 10:20:19 -20.1 Dark Up 22.7 201.9 Low 10:05:19 - 10:35:19 2661
Ellensburg 10:20:19 -20.6 Dark Up 23.1 201.8 Low 10:05:19 - 10:35:19 2642
Yakima 10:20:19 -20.9 Dark Up 23.5 201.8 Low 10:05:19 - 10:35:19 2625
Pasco 10:20:14 -20.6 Dark Up 23.4 203.3 Low 10:05:14 - 10:35:14 2619
Toppenish/White Swan 10:20:18 -21.0 Dark Up 23.6 202.0 Low 10:05:18 - 10:35:18 2616
PNWRO 10:20:13 -20.7 Dark Up 23.6 203.6 Low 10:05:13 - 10:35:13 2610
George/Umatilla 10:20:14 -20.9 Dark Up 23.8 203.1 Low 10:05:14 - 10:35:14 2603
Goldendale 10:20:18 -21.6 Dark Up 24.3 201.7 Low 10:05:18 - 10:35:18 2589
The Dalles 10:20:20 -22.0 Dark Up 24.6 201.3 Low 10:05:20 - 10:35:20 2576
Maupin 10:20:19 -22.2 Dark Up 24.9 201.5 Low 10:05:19 - 10:35:19 2558
Madras/Culver 10:20:18 -22.7 Dark Up 25.4 201.6 Low 10:05:18 - 10:35:18 2532
Redmond 10:20:17 -23.0 Dark Up 25.8 201.6 Low 10:05:17 - 10:35:17 2514
Sisters 10:20:18 -23.2 Dark Up 25.9 201.2 Low 10:05:18 - 10:35:18 2512
Bend 10:20:17 -23.2 Dark Up 26.0 201.5 Low 10:05:17 - 10:35:17 2503
Oregon Observatory 10:20:17 -23.4 Dark Up 26.2 201.4 Low 10:05:17 - 10:35:17 2494
La Pine/Gilchrist 10:20:17 -23.6 Dark Up 26.4 201.3 Low 10:05:17 - 10:35:17 2483
North Lake 10:20:15 -23.7 Dark Up 26.7 202.0 Low 10:05:15 - 10:35:15 2466
Paisley 10:20:13 -24.0 Dark Up 27.1 202.5 Low 10:05:13 - 10:35:13 2441
Chiloquin 10:20:17 -24.7 Dark Up 27.6 201.2 Low 10:05:17 - 10:35:17 2425
Lakeview 10:20:11 -24.3 Dark Up 27.5 202.8 Low 10:05:11 - 10:35:11 2417
Klamath Falls 10:20:16 -24.9 Dark Up 27.9 201.3 Low 10:05:16 - 10:35:16 2408
Tulelake 10:20:14 -25.0 Dark Up 28.0 201.7 Low 10:05:14 - 10:35:14 2397
Cedarville 10:20:10 -24.8 Dark Up 28.1 203.1 Low 10:05:10 - 10:35:10 2384
SwRI 10:19:19 -18.0 AT Up 23.7 217.8 Low 10:04:19 - 10:34:19 2356
Fall River/Burney 10:20:13 -25.7 Dark Up 28.9 201.9 Low 10:05:13 - 10:35:13 2349
Susanville 10:20:09 -25.9 Dark Up 29.2 202.8 Low 10:05:09 - 10:35:09 2321
Gimple 10:20:10 -26.2 Dark Up 29.5 202.7 Low 10:05:10 - 10:35:10 2305
Greenville 10:20:10 -26.2 Dark Up 29.6 202.6 Low 10:05:10 - 10:35:10 2304
Quincy 10:20:09 -26.4 Dark Up 29.8 202.6 Low 10:05:09 - 10:35:09 2293
Portola 10:20:08 -26.3 Dark Up 29.7 203.2 Low 10:05:08 - 10:35:08 2290
Reno 10:20:05 -26.1 Dark Up 29.8 203.9 Low 10:05:05 - 10:35:05 2280
Carson City 10:20:05 -26.4 Dark Up 30.1 204.0 Up 10:05:05 - 10:35:05 2260
Yerington 10:20:01 -26.3 Dark Up 30.1 204.7 Up 10:05:01 - 10:35:01 2253
Gardnerville 10:20:04 -26.6 Dark Up 30.3 204.1 Up 10:05:04 - 10:35:04 2246
Hawthorne 10:19:59 -26.4 Dark Up 30.3 205.3 Up 10:04:59 - 10:34:59 2231
Tonopah 10:19:54 -26.0 Dark Up 30.3 206.9 Up 10:04:54 - 10:34:54 2213
Lee Vining 10:20:00 -27.0 Dark Up 31.0 205.0 Up 10:05:00 - 10:35:00 2194
Bishop 10:19:57 -27.1 Dark Up 31.3 205.9 Up 10:04:57 - 10:34:57 2164
Beatty 10:19:50 -26.6 Dark Up 31.1 207.7 Up 10:04:50 - 10:34:50 2147
Indian Springs 10:19:46 -26.3 Dark Up 31.0 208.8 Up 10:04:46 - 10:34:46 2134
Lone Pine 10:19:54 -27.5 Dark Up 31.9 206.4 Up 10:04:54 - 10:34:54 2121
Henderson 10:19:42 -26.3 Dark Up 31.2 209.7 Up 10:04:42 - 10:34:42 2105
Patrick 10:19:37 -26.1 Dark Up 31.3 211.0 Up 10:04:37 - 10:34:37 2072
Searchlight/Boulder City 10:19:41 -26.6 Dark Up 31.7 209.9 Up 10:04:41 - 10:34:41 2070
Kingman/Dolan Springs 10:19:38 -26.3 Dark Up 31.6 210.9 Up 10:04:38 - 10:34:38 2057
Laughlin/Bullhead City 10:19:39 -26.6 Dark Up 31.8 210.4 Up 10:04:39 - 10:34:39 2053
Mohave Valley 10:19:39 -26.8 Dark Up 32.0 210.5 Up 10:04:39 - 10:34:39 2036
CPSLO 10:20:01 -29.9 Dark Up 33.9 204.0 Up 10:05:01 - 10:35:01 2022
Lake Havasu City 10:19:37 -27.0 Dark Up 32.3 210.8 Up 10:04:37 - 10:34:37 2012
Parker 10:19:36 -27.2 Dark Up 32.6 211.0 Up 10:04:36 - 10:34:36 1990
Wildwood 10:19:52 -29.7 Dark Up 34.3 206.6 Up 10:04:52 - 10:34:52 1961
Blythe 10:19:36 -27.7 Dark Up 33.2 210.8 Up 10:04:36 - 10:34:36 1955
Idyllwild 10:19:44 -28.9 Dark Up 33.9 208.6 Up 10:04:44 - 10:34:44 1951
Calipatria 10:19:39 -28.6 Dark Up 34.0 210.1 Up 10:04:39 - 10:34:39 1918
Yuma 10:19:35 -28.4 Dark Up 34.0 211.1 Up 10:04:35 - 10:34:35 1894

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 535988, (2026/04/30 10:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.96  44
27Bet Lib      15:17:00.3 -09:22:59  2.6  8.26  27
32Zet1Lib      15:28:15.4 -16:43:00  5.6  0.49  29
PPM 230220     15:25:25.8 -17:05:39  8.4  0.62  28
PPM 230279     15:27:44.9 -17:09:14  9.4  0.07  29
535988         15:27:58.4 -17:12:09 14.6        29
Positions are for J2000

Event circumstances last updated at 2019/07/09 23:32:52 UT

Marc W. Buie, Southwest Research Institute

RECON