RECON: TNO occultation with 523770

Event between (523770) 14XO40 and star GA0780:04661512 with event index number of 1430445

Geocentric closest approach at 2025/04/21 10:01:32 UTC

J2000 position of star is 14:57:06.4 -10:11:32
Equinox of date position of star is 14:58:09.5 -10:16:11
Stellar brightness G=15.5, use SENSEUP=128
Star is 82 degrees from the moon. Moon is 46% illuminated.
TNO apparent brightness V=20.1

[RECON map]
TNO is 16.3 AU from the Sun and 15.3 AU from the Earth.
The TNO is moving 20.7 km/sec on the sky relative to the star, or, 6.7 arcsec/hr.
The 1-sigma error in the time of the event is 439 seconds.
The 1-sigma cross-track error in the shadow position is 5466 km.
The sky-plane scale is 11115.6 km/arcsec.

The TNO has an absolute magnitude Hv=8.0
Diameter=151.4 km assuming a 5% albedo -- 7.3 sec chord
Diameter=61.8 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523770, (2025/04/21 10:02UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:31.8 -11:17:33  1.0 22.60 102
27Bet Lib      15:18:22.4 -09:28:29  2.6  4.97  77
18 Lib         15:00:16.0 -11:14:39  5.8  1.05  81
PPM 229488     14:56:53.1 -10:22:58  8.3  0.40  82
PPM 229524     14:58:14.5 -10:12:17  9.6  0.11  82
523770         14:58:28.5 -10:17:34 15.5        81
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 2.0 sigma about the mid-time.
The median site spacing is 7.5 km RECON observability=1.0 and success probability=3.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 10:01:45 -22.9 Dark Up 32.2 216.5 Up 09:46:45 - 10:16:45 5802
SwRI 10:01:46 -23.0 Dark Up 32.3 216.4 Up 09:46:46 - 10:16:46 5794
Kelowna 10:02:57 -22.1 Dark Down 28.1 198.8 Low 09:47:57 - 10:17:57 5742
Penticton 10:02:57 -22.5 Dark Down 28.5 198.7 Low 09:47:57 - 10:17:57 5724
Summerland 10:02:57 -22.5 Dark Down 28.5 198.6 Low 09:47:57 - 10:17:57 5722
Okanagan Falls 10:02:57 -22.7 Dark Down 28.7 198.7 Low 09:47:57 - 10:17:57 5716
Oliver 10:02:56 -22.8 Dark Down 28.9 198.8 Low 09:47:56 - 10:17:56 5711
Anarchist Mountain Observatory 10:02:55 -22.9 Dark Down 29.0 199.0 Low 09:47:55 - 10:17:55 5710
Oroville 10:02:55 -23.0 Dark Down 29.1 198.9 Low 09:47:55 - 10:17:55 5705
Tonasket 10:02:55 -23.2 Dark Down 29.3 199.0 Low 09:47:55 - 10:17:55 5697
Okanogan 10:02:55 -23.5 Dark Down 29.6 198.9 Low 09:47:55 - 10:17:55 5679
Brewster 10:02:54 -23.8 Dark Down 29.9 198.7 Low 09:47:54 - 10:17:54 5662
Manson/Chelan 10:02:54 -24.1 Dark Down 30.2 198.3 Up 09:47:54 - 10:17:54 5641
Entiat 10:02:55 -24.3 Dark Down 30.4 198.3 Up 09:47:55 - 10:17:55 5630
Wenatchee 10:02:55 -24.6 Dark Down 30.7 198.2 Up 09:47:55 - 10:17:55 5616
Pasco 10:02:47 -25.1 Dark Down 31.5 199.8 Up 09:47:47 - 10:17:47 5609
PNWRO 10:02:47 -25.2 Dark Down 31.7 200.1 Up 09:47:47 - 10:17:47 5607
Ellensburg 10:02:54 -25.0 Dark Down 31.1 198.1 Up 09:47:54 - 10:17:54 5592
George/Umatilla 10:02:47 -25.4 Dark Down 31.9 199.6 Up 09:47:47 - 10:17:47 5588
Yakima 10:02:53 -25.3 Dark Down 31.5 198.1 Up 09:47:53 - 10:17:53 5574
Toppenish/White Swan 10:02:52 -25.5 Dark Down 31.7 198.3 Up 09:47:52 - 10:17:52 5571
Goldendale 10:02:52 -26.1 Dark Down 32.3 198.0 Up 09:47:52 - 10:17:52 5532
The Dalles 10:02:53 -26.4 Dark Down 32.6 197.6 Up 09:47:53 - 10:17:53 5510
Maupin 10:02:51 -26.7 Dark Down 33.0 197.8 Up 09:47:51 - 10:17:51 5495
Madras/Culver 10:02:50 -27.2 Dark Down 33.5 197.8 Up 09:47:50 - 10:17:50 5469
Redmond 10:02:48 -27.5 Dark Down 33.9 197.8 Up 09:47:48 - 10:17:48 5451
Sisters 10:02:50 -27.7 Dark Down 33.9 197.4 Up 09:47:50 - 10:17:50 5437
Bend 10:02:48 -27.8 Dark Down 34.1 197.7 Up 09:47:48 - 10:17:48 5436
Oregon Observatory 10:02:49 -27.9 Dark Down 34.3 197.6 Up 09:47:49 - 10:17:49 5423
North Lake 10:02:45 -28.3 Dark Down 34.8 198.4 Up 09:47:45 - 10:17:45 5413
La Pine/Gilchrist 10:02:49 -28.1 Dark Down 34.5 197.6 Up 09:47:49 - 10:17:49 5411
Paisley 10:02:43 -28.6 Dark Down 35.2 198.9 Up 09:47:43 - 10:17:43 5399
Lakeview 10:02:42 -28.9 Dark Down 35.7 199.2 Up 09:47:42 - 10:17:42 5382
Cedarville 10:02:39 -29.4 Dark Down 36.2 199.6 Up 09:47:39 - 10:17:39 5356
Chiloquin 10:02:48 -29.2 Dark Down 35.6 197.4 Up 09:47:48 - 10:17:48 5344
Klamath Falls 10:02:46 -29.5 Dark Down 36.0 197.6 Up 09:47:46 - 10:17:46 5331
Tulelake 10:02:45 -29.6 Dark Down 36.1 198.0 Up 09:47:45 - 10:17:45 5329
Tonopah 10:02:20 -30.8 Dark Up 38.6 204.0 Up 09:47:20 - 10:17:20 5289
Fall River/Burney 10:02:43 -30.3 Dark Down 37.0 198.3 Up 09:47:43 - 10:17:43 5286
Susanville 10:02:39 -30.5 Dark Down 37.4 199.3 Up 09:47:39 - 10:17:39 5282
DCO 10:01:57 -30.9 Dark Up 39.8 209.8 Up 09:46:57 - 10:16:57 5281
Patrick 10:02:01 -31.1 Dark Up 39.8 208.8 Up 09:47:01 - 10:17:01 5271
Reno 10:02:33 -30.9 Dark Up 38.0 200.5 Up 09:47:33 - 10:17:33 5268
Indian Springs 10:02:10 -31.2 Dark Up 39.5 206.3 Up 09:47:10 - 10:17:10 5267
Yerington 10:02:29 -31.0 Dark Up 38.4 201.4 Up 09:47:29 - 10:17:29 5264
Henderson 10:02:07 -31.2 Dark Up 39.7 207.3 Up 09:47:07 - 10:17:07 5264
Hawthorne 10:02:26 -31.1 Dark Up 38.6 202.2 Up 09:47:26 - 10:17:26 5260
Gimple 10:02:38 -30.8 Dark Down 37.7 199.1 Up 09:47:38 - 10:17:38 5259
Portola 10:02:36 -30.9 Dark Up 37.9 199.7 Up 09:47:36 - 10:17:36 5257
Greenville 10:02:38 -30.9 Dark Down 37.7 199.0 Up 09:47:38 - 10:17:38 5256
Kingman/Dolan Springs 10:02:01 -31.3 Dark Up 40.1 208.7 Up 09:47:01 - 10:17:01 5252
Carson City 10:02:33 -31.1 Dark Up 38.3 200.6 Up 09:47:33 - 10:17:33 5250
Quincy 10:02:38 -31.0 Dark Down 37.9 199.1 Up 09:47:38 - 10:17:38 5246
Beatty 10:02:15 -31.5 Dark Up 39.6 204.9 Up 09:47:15 - 10:17:15 5244
Gardnerville 10:02:31 -31.3 Dark Up 38.6 200.7 Up 09:47:31 - 10:17:31 5239
Searchlight/Boulder City 10:02:05 -31.6 Dark Up 40.2 207.6 Up 09:47:05 - 10:17:05 5234
Laughlin/Bullhead City 10:02:03 -31.6 Dark Up 40.3 208.1 Up 09:47:03 - 10:17:03 5231
Mohave Valley 10:02:01 -31.8 Dark Up 40.6 208.2 Up 09:47:01 - 10:17:01 5216
Lee Vining 10:02:26 -31.8 Dark Up 39.3 201.8 Up 09:47:26 - 10:17:26 5210
Bishop 10:02:23 -31.9 Dark Up 39.6 202.8 Up 09:47:23 - 10:17:23 5206
Lake Havasu City 10:02:00 -32.0 Dark Up 40.8 208.7 Up 09:47:00 - 10:17:00 5202
Parker 10:01:59 -32.2 Dark Up 41.1 208.8 Up 09:46:59 - 10:16:59 5183
Lone Pine 10:02:19 -32.4 Dark Up 40.2 203.4 Up 09:47:19 - 10:17:19 5177
Blythe 10:01:59 -32.8 Dark Up 41.7 208.7 Up 09:46:59 - 10:16:59 5141
Yuma 10:01:55 -33.5 Dark Up 42.5 209.0 Up 09:46:55 - 10:16:55 5085
Calipatria 10:02:01 -33.7 Dark Up 42.5 207.8 Up 09:47:01 - 10:17:01 5076
Idyllwild 10:02:06 -33.9 Dark Up 42.4 206.1 Up 09:47:06 - 10:17:06 5065
Wildwood 10:02:15 -34.6 Dark Up 42.7 203.6 Up 09:47:15 - 10:17:15 5011
CPSLO 10:02:25 -34.7 Dark Up 42.2 200.7 Up 09:47:25 - 10:17:25 4999

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 523770, (2025/04/21 10:02UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 22.60 102
27Bet Lib      15:17:00.3 -09:22:59  2.6  4.97  77
18 Lib         14:58:53.4 -11:08:40  5.8  1.05  81
PPM 229488     14:55:31.0 -10:16:54  8.3  0.40  82
PPM 229524     14:56:52.5 -10:06:15  9.6  0.11  82
523770         14:57:06.4 -10:11:32 15.5        81
Positions are for J2000

Event circumstances last updated at 2019/06/08 10:56:46 UT

Marc W. Buie, Southwest Research Institute

RECON