RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1320:01797046 with event index number of 1587679

Geocentric closest approach at 2026/10/26 09:28:18 UTC

J2000 position of star is 04:20:35.5 +43:02:38
Equinox of date position of star is 04:22:03.2 +43:05:32
Stellar brightness G=15.9, use SENSEUP=128
Star is 38 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 16.0 AU from the Sun and 15.2 AU from the Earth.
The TNO is moving 23.6 km/sec on the sky relative to the star, or, 7.7 arcsec/hr.
The 1-sigma error in the time of the event is 72 seconds.
The 1-sigma cross-track error in the shadow position is 5586 km.
The sky-plane scale is 11051.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=57.5 km assuming a 5% albedo -- 2.6 sec chord
Diameter=23.5 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 517717, (2026/10/26 09:28UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.7 +16:33:41  0.8 26.74  35
Mirphak        03:26:15.1 +49:57:16  1.8 11.82  35
PPM 046963     04:20:00.0 +42:12:17  6.1  1.01  37
PPM 046997     04:22:24.9 +43:18:02  8.5  0.19  38
PPM 047000     04:22:39.7 +43:04:10  8.8  0.05  38
517717         04:22:28.4 +43:06:22 15.9        38
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 24.5 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)
Clarence Fulton 09:28:34 -46.3 Dark Up 81.1 141.5 Up 09:22:06 - 09:35:02 -1388
Kelowna 09:28:35 -46.7 Dark Up 81.4 139.3 Up 09:22:07 - 09:35:03 -1426
Peachland 09:28:36 -46.9 Dark Up 81.3 137.6 Up 09:22:08 - 09:35:04 -1431
Summerland 09:28:36 -47.0 Dark Up 81.5 137.3 Up 09:22:08 - 09:35:04 -1449
Penticton 09:28:36 -47.0 Dark Up 81.6 137.5 Up 09:22:08 - 09:35:04 -1458
Victoria 09:28:48 -49.3 Dark Up 80.3 119.9 Up 09:22:20 - 09:35:16 -1474
Oliver 09:28:36 -47.3 Dark Up 81.8 135.8 Up 09:22:08 - 09:35:04 -1495
Anarchist Mountain Observatory 09:28:36 -47.3 Dark Up 82.0 135.8 Up 09:22:08 - 09:35:04 -1518
Tonasket 09:28:36 -47.6 Dark Up 82.2 133.9 Up 09:22:08 - 09:35:04 -1549
Okanogan 09:28:37 -47.9 Dark Up 82.4 131.5 Up 09:22:09 - 09:35:05 -1581
Brewster 09:28:38 -48.2 Dark Up 82.5 129.1 Up 09:22:10 - 09:35:06 -1605
Manson/Chelan 09:28:40 -48.5 Dark Up 82.4 126.5 Up 09:22:12 - 09:35:08 -1618
Entiat 09:28:40 -48.7 Dark Up 82.5 124.9 Up 09:22:12 - 09:35:08 -1640
Wenatchee 09:28:41 -48.9 Dark Up 82.6 122.9 Up 09:22:13 - 09:35:09 -1664
Ellensburg 09:28:42 -49.3 Dark Up 82.7 119.4 Up 09:22:14 - 09:35:10 -1703
Yakima 09:28:43 -49.7 Dark Up 82.9 116.6 Up 09:22:15 - 09:35:11 -1745
Toppenish/White Swan 09:28:43 -49.7 Dark Up 83.1 115.5 Up 09:22:15 - 09:35:11 -1772
Pasco 09:28:39 -49.3 Dark Up 83.9 119.0 Up 09:22:11 - 09:35:07 -1814
Goldendale 09:28:45 -50.4 Dark Up 83.0 110.1 Up 09:22:17 - 09:35:13 -1820
The Dalles 09:28:46 -50.7 Dark Up 82.8 107.5 Up 09:22:18 - 09:35:14 -1835
PNWRO 09:28:39 -49.3 Dark Up 84.1 117.8 Up 09:22:11 - 09:35:07 -1846
Maupin 09:28:46 -51.0 Dark Up 83.0 104.5 Up 09:22:18 - 09:35:14 -1881
Sisters 09:28:49 -51.8 Dark Up 82.8 96.7 Up 09:22:21 - 09:35:17 -1961
Redmond 09:28:48 -51.7 Dark Up 83.1 97.0 Up 09:22:20 - 09:35:16 -1974
Bend 09:28:49 -51.9 Dark Up 83.1 95.1 Up 09:22:21 - 09:35:17 -1993
Oregon Observatory 09:28:50 -52.1 Dark Up 83.0 93.5 Up 09:22:22 - 09:35:18 -2008
La Pine/Gilchrist 09:28:50 -52.3 Dark Up 82.9 91.8 Up 09:22:22 - 09:35:18 -2028
North Lake 09:28:49 -52.3 Dark Up 83.4 88.6 Up 09:22:21 - 09:35:17 -2089
Paisley 09:28:49 -52.5 Dark Up 83.6 83.9 Up 09:22:21 - 09:35:17 -2157
Klamath Falls 09:28:53 -53.5 Dark Up 82.6 80.3 Up 09:22:25 - 09:35:21 -2174
Lakeview 09:28:49 -52.8 Dark Up 83.7 79.3 Up 09:22:21 - 09:35:17 -2215
Cedarville 09:28:49 -53.2 Dark Up 83.6 73.4 Up 09:22:21 - 09:35:17 -2289
Fall River/Burney 09:28:54 -54.1 Dark Up 82.6 71.1 Up 09:22:26 - 09:35:22 -2308
Susanville 09:28:52 -54.2 Dark Up 82.9 65.3 Up 09:22:24 - 09:35:20 -2394
Greenville 09:28:53 -54.5 Dark Up 82.6 63.9 Up 09:22:25 - 09:35:21 -2416
Gimple 09:28:53 -54.5 Dark Up 82.7 63.7 Up 09:22:25 - 09:35:21 -2418
Quincy 09:28:54 -54.7 Dark Up 82.5 62.5 Up 09:22:26 - 09:35:22 -2437
Portola 09:28:52 -54.5 Dark Up 82.8 60.6 Up 09:22:24 - 09:35:20 -2463
Reno 09:28:51 -54.3 Dark Up 83.1 57.1 Up 09:22:23 - 09:35:19 -2508
Carson City 09:28:51 -54.5 Dark Up 82.9 54.7 Up 09:22:23 - 09:35:19 -2547
Gardnerville 09:28:51 -54.7 Dark Up 82.8 53.0 Up 09:22:23 - 09:35:19 -2574
Yerington 09:28:50 -54.3 Dark Up 83.1 51.4 Up 09:22:22 - 09:35:18 -2584
Hawthorne 09:28:48 -54.3 Dark Up 83.2 46.6 Up 09:22:20 - 09:35:16 -2646
Lee Vining 09:28:50 -54.9 Dark Up 82.5 45.1 Up 09:22:22 - 09:35:18 -2694
Niwot 09:27:59 -44.8 Dark Up 84.3 303.4 Up 09:21:31 - 09:34:27 -2723
Tonopah 09:28:44 -53.7 Dark Up 83.5 37.8 Up 09:22:16 - 09:35:12 -2731
SwRI 09:28:00 -44.9 Dark Up 84.4 304.6 Up 09:21:32 - 09:34:28 -2733
Bishop 09:28:48 -54.9 Dark Up 82.4 39.4 Up 09:22:20 - 09:35:16 -2776
Beatty 09:28:43 -54.1 Dark Up 82.8 30.1 Up 09:22:15 - 09:35:11 -2865
Indian Springs 09:28:40 -53.6 Dark Up 82.9 23.5 Up 09:22:12 - 09:35:08 -2925
CPSLO 09:28:59 -57.5 Dark Up 79.7 38.7 Up 09:22:31 - 09:35:27 -2932
Henderson 09:28:38 -53.4 Dark Up 82.6 18.4 Up 09:22:10 - 09:35:06 -2998
Searchlight/Boulder City 09:28:39 -53.7 Dark Up 82.0 16.8 Up 09:22:11 - 09:35:07 -3061
Patrick 09:28:34 -53.0 Dark Up 82.2 11.3 Up 09:22:06 - 09:35:02 -3089
Laughlin/Bullhead City 09:28:37 -53.6 Dark Up 81.8 14.5 Up 09:22:09 - 09:35:05 -3100
Kingman/Dolan Springs 09:28:35 -53.2 Dark Up 81.9 12.0 Up 09:22:07 - 09:35:03 -3109
Wildwood 09:28:54 -56.9 Dark Up 79.6 28.5 Up 09:22:26 - 09:35:22 -3116
Mohave Valley 09:28:38 -53.7 Dark Up 81.6 14.0 Up 09:22:10 - 09:35:06 -3129
DCO 09:28:32 -52.6 Dark Up 82.0 7.3 Up 09:22:04 - 09:35:00 -3137
Lake Havasu City 09:28:37 -53.7 Dark Up 81.2 12.2 Up 09:22:09 - 09:35:05 -3178
Idyllwild 09:28:47 -55.8 Dark Up 79.9 20.9 Up 09:22:19 - 09:35:15 -3203
Parker 09:28:37 -53.9 Dark Up 80.9 11.6 Up 09:22:09 - 09:35:05 -3216
Blythe 09:28:39 -54.3 Dark Up 80.3 12.3 Up 09:22:11 - 09:35:07 -3265
Calipatria 09:28:43 -55.2 Dark Up 79.7 15.3 Up 09:22:15 - 09:35:11 -3295
George/Scottsdale 09:28:29 -52.3 Dark Up 80.7 0.5 Up 09:22:01 - 09:34:57 -3312
Yuma 09:28:40 -54.8 Dark Up 79.4 11.3 Up 09:22:12 - 09:35:08 -3362

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 517717, (2026/10/26 09:28UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 26.74  35
Mirphak        03:24:19.4 +49:51:40  1.8 11.82  35
PPM 046963     04:18:08.2 +42:08:27  6.1  1.01  37
PPM 046997     04:20:31.8 +43:14:18  8.5  0.19  38
PPM 047000     04:20:46.8 +43:00:27  8.8  0.05  38
517717         04:20:35.5 +43:02:38 15.9        38
Positions are for J2000

Event circumstances last updated at 2020/10/30 22:21:39 UT

Marc W. Buie, Southwest Research Institute

RECON