RECON: TNO occultation with 525816

Event between (525816) 05SF278 and star GA1020:00440260 with event index number of 2167377

Geocentric closest approach at 2023/10/24 06:56:48 UTC

J2000 position of star is 04:18:07.3 +12:49:21
Equinox of date position of star is 04:19:20.6 +12:52:29
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 95 degrees from the moon. Moon is 74% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 35.5 AU from the Sun and 34.7 AU from the Earth.
The TNO is moving 19.6 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 93 seconds.
The 1-sigma cross-track error in the shadow position is 1383 km.
The sky-plane scale is 25183.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.7
Diameter=278.0 km assuming a 5% albedo -- 14.2 sec chord
Diameter=113.5 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is 7:4EEE
 
 
 
 
 
 

Star training set for 525816, (2023/10/24 07:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:17.4 +16:33:19  0.8  5.67 100
Bellatrix      05:26:24.6 +06:22:09  1.6 17.73 109
PPM 119807     04:22:13.3 +13:55:10  6.3  1.24  96
PPM 119786     04:20:47.9 +12:01:19  7.6  0.92  95
PPM 119778     04:20:12.0 +12:58:52  8.6  0.21  95
525816         04:19:27.1 +12:52:45 16.0        95
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 19.5 km RECON observability=1.0 and success probability=12.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 06:58:27 -49.8 Dark Up 35.9 116.8 Up 06:50:12 - 07:06:41 3486
Victoria 06:58:42 -51.2 Dark Up 35.0 112.6 Up 06:50:28 - 07:06:57 3416
Kelowna 06:58:27 -50.8 Dark Up 36.8 117.2 Up 06:50:13 - 07:06:42 3412
Peachland 06:58:28 -50.8 Dark Up 36.7 116.8 Up 06:50:14 - 07:06:43 3412
Summerland 06:58:29 -51.0 Dark Up 36.8 116.8 Up 06:50:14 - 07:06:43 3400
Penticton 06:58:29 -51.1 Dark Up 36.9 116.9 Up 06:50:15 - 07:06:44 3393
Oliver 06:58:30 -51.4 Dark Up 37.0 116.6 Up 06:50:16 - 07:06:45 3370
Anarchist Mountain Observatory 06:58:32 -51.6 Dark Up 37.2 116.7 Up 06:50:17 - 07:06:46 3354
Tonasket 06:58:33 -51.9 Dark Up 37.3 116.4 Up 06:50:18 - 07:06:47 3335
Okanogan 06:58:34 -52.2 Dark Up 37.4 116.1 Up 06:50:19 - 07:06:48 3316
Brewster 06:58:35 -52.4 Dark Up 37.4 115.7 Up 06:50:21 - 07:06:50 3302
Manson/Chelan 06:58:37 -52.5 Dark Up 37.3 115.2 Up 06:50:22 - 07:06:51 3297
Wenatchee 06:58:39 -52.9 Dark Up 37.4 114.7 Up 06:50:25 - 07:06:54 3268
Sleaford 06:57:44 -49.6 Dark Up 42.4 133.1 Up 06:49:30 - 07:05:59 3257
Ellensburg 06:58:42 -53.3 Dark Up 37.4 114.2 Up 06:50:28 - 07:06:57 3245
Yakima 06:58:43 -53.7 Dark Up 37.6 113.9 Up 06:50:29 - 07:06:58 3217
Toppenish/White Swan 06:58:44 -53.9 Dark Up 37.8 113.9 Up 06:50:30 - 07:06:59 3198
Goldendale 06:58:48 -54.3 Dark Up 37.7 113.2 Up 06:50:33 - 07:07:02 3170
The Dalles 06:58:49 -54.4 Dark Up 37.6 112.7 Up 06:50:34 - 07:07:03 3163
Pasco 06:58:42 -54.3 Dark Up 38.6 115.1 Up 06:50:27 - 07:06:56 3158
PNWRO 06:58:41 -54.6 Dark Up 38.9 115.1 Up 06:50:27 - 07:06:56 3135
Maupin 06:58:50 -54.9 Dark Up 37.8 112.5 Up 06:50:35 - 07:07:04 3131
Sisters 06:58:55 -55.6 Dark Up 37.8 111.4 Up 06:50:40 - 07:07:09 3080
Redmond 06:58:55 -55.7 Dark Up 38.1 111.8 Up 06:50:40 - 07:07:09 3068
Bend 06:58:55 -55.8 Dark Up 38.1 111.5 Up 06:50:41 - 07:07:10 3056
Oregon Observatory 06:58:56 -56.0 Dark Up 38.1 111.2 Up 06:50:41 - 07:07:10 3047
La Pine/Gilchrist 06:58:57 -56.1 Dark Up 38.1 111.0 Up 06:50:43 - 07:07:12 3034
North Lake 06:58:58 -56.7 Dark Up 38.7 111.3 Up 06:50:43 - 07:07:12 2986
Chiloquin 06:59:02 -57.1 Dark Up 38.3 109.9 Up 06:50:48 - 07:07:17 2961
Paisley 06:58:59 -57.3 Dark Up 39.1 111.2 Up 06:50:45 - 07:07:14 2936
Klamath Falls 06:59:04 -57.4 Dark Up 38.4 109.7 Up 06:50:50 - 07:07:19 2933
Lakeview 06:59:00 -57.8 Dark Up 39.4 111.0 Up 06:50:46 - 07:07:15 2892
Cedarville 06:59:02 -58.5 Dark Up 39.8 110.6 Up 06:50:48 - 07:07:17 2838
Fall River/Burney 06:59:08 -58.6 Dark Up 39.1 109.2 Up 06:50:53 - 07:07:22 2833
Susanville 06:59:09 -59.4 Dark Up 39.9 109.3 Up 06:50:54 - 07:07:23 2765
Greenville 06:59:10 -59.6 Dark Up 39.7 108.9 Up 06:50:55 - 07:07:24 2751
Gimple 06:59:10 -59.6 Dark Up 39.8 108.9 Up 06:50:55 - 07:07:24 2749
Quincy 06:59:11 -59.8 Dark Up 39.8 108.7 Up 06:50:56 - 07:07:25 2735
Portola 06:59:11 -60.0 Dark Up 40.2 109.0 Up 06:50:56 - 07:07:25 2712
Reno 06:59:09 -60.5 Dark Up 40.8 109.4 Up 06:50:55 - 07:07:24 2674
Carson City 06:59:10 -60.8 Dark Up 40.9 109.1 Up 06:50:55 - 07:07:24 2645
Gardnerville 06:59:11 -61.0 Dark Up 41.0 108.9 Up 06:50:56 - 07:07:25 2624
Yerington 06:59:09 -61.2 Dark Up 41.4 109.5 Up 06:50:55 - 07:07:24 2611
Hawthorne 06:59:09 -61.7 Dark Up 42.0 109.5 Up 06:50:54 - 07:07:23 2559
Lee Vining 06:59:12 -62.1 Dark Up 41.8 108.7 Up 06:50:58 - 07:07:27 2528
Tonopah 06:59:07 -62.6 Dark Up 43.2 110.4 Up 06:50:52 - 07:07:21 2482
Bishop 06:59:13 -62.9 Dark Up 42.5 108.8 Up 06:50:58 - 07:07:27 2458
Beatty 06:59:10 -63.8 Dark Up 43.9 109.7 Up 06:50:55 - 07:07:24 2373
CPSLO 06:59:26 -64.0 Dark Up 41.4 105.2 Up 06:51:11 - 07:07:40 2351
Dunrhomin 06:58:22 -61.3 Dark Up 50.3 124.4 Up 06:50:07 - 07:06:36 2331
Indian Springs 06:59:07 -64.3 Dark Up 44.8 110.4 Up 06:50:53 - 07:07:22 2314
Henderson 06:59:07 -65.0 Dark Up 45.5 110.5 Up 06:50:53 - 07:07:22 2249
Wildwood 06:59:24 -65.9 Dark Up 43.4 105.7 Up 06:51:10 - 07:07:39 2188
Patrick 06:59:06 -65.8 Dark Up 46.6 110.8 Up 06:50:52 - 07:07:21 2163
Laughlin/Bullhead City 06:59:08 -65.9 Dark Up 46.2 110.0 Up 06:50:54 - 07:07:23 2162
Kingman/Dolan Springs 06:59:07 -66.0 Dark Up 46.5 110.4 Up 06:50:53 - 07:07:22 2149
Mohave Valley 06:59:10 -66.2 Dark Up 46.3 109.7 Up 06:50:55 - 07:07:24 2139
Idyllwild 06:59:20 -66.8 Dark Up 45.0 106.9 Up 06:51:06 - 07:07:35 2102
Lake Havasu City 06:59:10 -66.6 Dark Up 46.6 109.5 Up 06:50:55 - 07:07:24 2097
Parker 06:59:11 -67.0 Dark Up 46.7 109.2 Up 06:50:57 - 07:07:26 2065
Blythe 06:59:14 -67.4 Dark Up 46.7 108.4 Up 06:51:00 - 07:07:29 2028
Calipatria 06:59:18 -67.7 Dark Up 46.1 107.2 Up 06:51:04 - 07:07:33 2013
George/Scottsdale 06:59:05 -67.8 Dark Up 48.8 110.9 Up 06:50:50 - 07:07:19 1956
Yuma 06:59:17 -68.3 Dark Up 46.9 107.5 Up 06:51:03 - 07:07:32 1948

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 525816, (2023/10/24 07:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  5.67 100
Bellatrix      05:25:07.8 +06:20:58  1.6 17.73 109
PPM 119807     04:20:52.9 +13:51:52  6.3  1.24  96
PPM 119786     04:19:28.6 +11:57:58  7.6  0.92  95
PPM 119778     04:18:52.2 +12:55:29  8.6  0.21  95
525816         04:18:07.3 +12:49:21 16.0        95
Positions are for J2000

Event circumstances last updated at 2021/11/15 00:57:44 UT

Marc W. Buie, Southwest Research Institute

RECON