RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:08724610 with event index number of 1471753

Geocentric closest approach at 2025/08/25 06:20:32 UTC

J2000 position of star is 18:42:11.7 -01:35:47
Equinox of date position of star is 18:43:12.1 -01:34:35
Stellar brightness G=13.9, use SENSEUP=64
Star is 105 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 20.3 AU from the Sun and 19.7 AU from the Earth.
The TNO is moving 14.2 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 165 seconds.
The 1-sigma cross-track error in the shadow position is 2148 km.
The sky-plane scale is 14273.8 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 6.4 sec chord
Diameter=37.2 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2025/08/25 06:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:59.1 -26:29:12  0.9 40.41  74
60Bet Oph      17:44:44.4 +04:33:30  2.8 15.91  90
5 Aql          18:47:48.0 -00:55:57  6.2  1.24 106
PPM 180411     18:44:37.8 -01:37:06  8.4  0.28 105
PPM 180409     18:44:19.5 -01:24:44 10.0  0.25 105
PPM 180407     18:44:12.1 -01:44:22 11.0  0.24 105
523686         18:43:31.5 -01:34:12 13.9       105
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 17.3 km RECON observability=1.0 and success probability=9.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:15:17 -25.3 Dark Down 33.3 213.7 Up 06:01:04 - 06:29:29 4834
Summerland 06:15:17 -25.5 Dark Down 33.6 213.5 Up 06:01:05 - 06:29:30 4822
Penticton 06:15:16 -25.6 Dark Down 33.7 213.7 Up 06:01:04 - 06:29:29 4812
Okanagan Falls 06:15:17 -25.7 Dark Down 33.8 213.7 Up 06:01:05 - 06:29:30 4798
Oliver 06:15:17 -25.9 Dark Down 34.0 213.8 Up 06:01:05 - 06:29:30 4785
Anarchist Mountain Observatory 06:15:15 -26.1 Dark Down 34.0 214.1 Up 06:01:03 - 06:29:28 4763
Oroville 06:15:17 -26.1 Dark Down 34.1 214.0 Up 06:01:05 - 06:29:30 4760
Tonasket 06:15:18 -26.3 Dark Down 34.3 214.1 Up 06:01:06 - 06:29:31 4741
Okanogan 06:15:18 -26.6 Dark Down 34.6 214.1 Up 06:01:06 - 06:29:31 4720
Brewster 06:15:19 -26.7 Dark Down 34.9 214.0 Up 06:01:06 - 06:29:31 4707
Manson/Chelan 06:15:21 -26.8 Dark Down 35.3 213.6 Up 06:01:09 - 06:29:34 4705
Entiat 06:15:21 -27.0 Dark Down 35.5 213.6 Up 06:01:08 - 06:29:33 4690
Wenatchee 06:15:23 -27.2 Dark Down 35.7 213.6 Up 06:01:10 - 06:29:35 4674
Ellensburg 06:15:22 -27.4 Dark Down 36.1 213.5 Up 06:01:10 - 06:29:35 4650
Yakima 06:15:24 -27.8 Dark Down 36.5 213.7 Up 06:01:12 - 06:29:37 4618
Toppenish/White Swan 06:15:22 -28.0 Dark Down 36.6 214.0 Up 06:01:10 - 06:29:35 4593
Goldendale 06:15:24 -28.4 Dark Down 37.2 213.7 Up 06:01:12 - 06:29:37 4567
The Dalles 06:15:27 -28.4 Dark Down 37.5 213.4 Up 06:01:14 - 06:29:39 4564
Pasco 06:15:19 -28.6 Dark Down 36.2 215.5 Up 06:01:07 - 06:29:32 4530
Maupin 06:15:27 -28.8 Dark Down 37.8 213.7 Up 06:01:14 - 06:29:39 4525
George/Umatilla 06:15:20 -28.8 Dark Down 36.6 215.4 Up 06:01:07 - 06:29:32 4512
PNWRO 06:15:17 -28.9 Dark Down 36.3 215.8 Up 06:01:05 - 06:29:30 4500
Madras/Culver 06:15:29 -29.3 Dark Down 38.3 213.9 Up 06:01:17 - 06:29:42 4482
Sisters 06:15:31 -29.4 Dark Down 38.8 213.5 Up 06:01:19 - 06:29:44 4475
Redmond 06:15:30 -29.6 Dark Down 38.6 214.0 Up 06:01:17 - 06:29:42 4455
Bend 06:15:28 -29.7 Dark Down 38.9 213.9 Up 06:01:16 - 06:29:41 4444
Oregon Observatory 06:15:30 -29.8 Dark Down 39.1 213.9 Up 06:01:18 - 06:29:43 4436
La Pine/Gilchrist 06:15:32 -29.9 Dark Down 39.3 213.9 Up 06:01:20 - 06:29:45 4421
North Lake 06:15:29 -30.5 Dark Down 39.4 214.8 Up 06:01:17 - 06:29:42 4358
Chiloquin 06:15:34 -30.7 Dark Down 40.3 214.0 Up 06:01:22 - 06:29:47 4345
Klamath Falls 06:15:36 -31.1 Dark Down 40.6 214.3 Up 06:01:23 - 06:29:48 4313
Paisley 06:15:29 -31.1 Dark Down 39.7 215.5 Up 06:01:16 - 06:29:41 4296
Tulelake 06:15:34 -31.4 Dark Down 40.7 214.8 Up 06:01:22 - 06:29:47 4277
Lakeview 06:15:29 -31.6 Dark Down 40.0 216.0 Up 06:01:16 - 06:29:41 4245
Fall River/Burney 06:15:36 -32.2 Dark Down 41.4 215.3 Up 06:01:23 - 06:29:48 4197
Cedarville 06:15:30 -32.3 Dark Down 40.4 216.5 Up 06:01:17 - 06:29:42 4181
Susanville 06:15:33 -33.0 Dark Down 41.6 216.5 Up 06:01:21 - 06:29:46 4109
Greenville 06:15:35 -33.1 Dark Down 41.9 216.3 Up 06:01:22 - 06:29:47 4099
Gimple 06:15:34 -33.2 Dark Down 41.9 216.4 Up 06:01:21 - 06:29:46 4095
Quincy 06:15:36 -33.3 Dark Down 42.1 216.4 Up 06:01:23 - 06:29:48 4082
Portola 06:15:34 -33.6 Dark Down 42.0 217.1 Up 06:01:21 - 06:29:46 4049
Reno 06:15:32 -34.1 Dark Down 41.9 218.0 Up 06:01:19 - 06:29:44 3995
Carson City 06:15:31 -34.4 Dark Down 42.1 218.2 Up 06:01:19 - 06:29:44 3963
Gardnerville 06:15:32 -34.7 Dark Down 42.3 218.4 Up 06:01:20 - 06:29:45 3940
Yerington 06:15:30 -34.8 Dark Down 42.0 219.0 Up 06:01:17 - 06:29:42 3916
Hawthorne 06:15:28 -35.5 Dark Down 42.1 219.9 Up 06:01:16 - 06:29:41 3851
Lee Vining 06:15:31 -35.7 Dark Down 42.8 219.7 Up 06:01:19 - 06:29:44 3824
Tonopah 06:15:22 -36.4 Dark Down 41.7 221.8 Up 06:01:10 - 06:29:35 3743
Bishop 06:15:29 -36.5 Dark Down 42.8 220.9 Up 06:01:16 - 06:29:41 3737
CPSLO 06:15:43 -37.3 Dark Down 45.6 219.6 Up 06:01:31 - 06:29:56 3666
Lone Pine 06:15:29 -37.3 Dark Down 43.2 221.7 Up 06:01:16 - 06:29:41 3654
Beatty 06:15:24 -37.6 Dark Down 42.3 223.0 Up 06:01:12 - 06:29:37 3618
Indian Springs 06:15:19 -38.3 Dark Down 42.0 224.4 Up 06:01:07 - 06:29:32 3538
Henderson 06:15:16 -39.0 Dark Down 42.0 225.5 Up 06:01:04 - 06:29:29 3457
Wildwood 06:15:37 -39.2 Dark Down 45.4 222.8 Up 06:01:25 - 06:29:50 3456
Niwot 06:14:33 -38.0 Dark Down 33.6 232.9 Up 06:00:21 - 06:28:46 3408
SwRI 06:14:35 -38.1 Dark Down 33.7 232.9 Up 06:00:22 - 06:28:47 3402
Searchlight/Boulder City 06:15:17 -39.6 Dark Down 42.3 226.0 Up 06:01:05 - 06:29:30 3401
Laughlin/Bullhead City 06:15:17 -40.0 Dark Down 42.3 226.5 Up 06:01:05 - 06:29:30 3357
Patrick 06:15:13 -40.0 Dark Down 41.7 227.1 Up 06:01:00 - 06:29:25 3346
Kingman/Dolan Springs 06:15:15 -40.1 Dark Down 42.0 227.1 Up 06:01:02 - 06:29:27 3335
Mohave Valley 06:15:18 -40.2 Dark Down 42.5 226.7 Up 06:01:05 - 06:29:30 3332
Idyllwild 06:15:29 -40.4 Dark Down 44.6 225.2 Up 06:01:16 - 06:29:41 3330
DCO 06:15:11 -40.5 Dark Down 41.5 228.1 Up 06:00:58 - 06:29:23 3285
Lake Havasu City 06:15:17 -40.6 Dark Down 42.6 227.3 Up 06:01:05 - 06:29:30 3283
Parker 06:15:18 -41.0 Dark Down 42.9 227.5 Up 06:01:05 - 06:29:30 3250
Calipatria 06:15:25 -41.4 Dark Down 44.3 226.9 Up 06:01:12 - 06:29:37 3216
Blythe 06:15:20 -41.3 Dark Down 43.4 227.6 Up 06:01:08 - 06:29:33 3216
Yuma 06:15:22 -42.1 Dark Down 44.0 228.2 Up 06:01:09 - 06:29:34 3132

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 523686, (2025/08/25 06:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 40.41  74
60Bet Oph      17:43:28.3 +04:34:05  2.8 15.91  90
5 Aql          18:46:28.6 -00:57:42  6.2  1.24 106
PPM 180411     18:43:18.0 -01:38:44  8.4  0.28 105
PPM 180409     18:42:59.8 -01:26:22 10.0  0.25 105
PPM 180407     18:42:52.2 -01:46:00 11.0  0.24 105
523686         18:42:11.7 -01:35:47 13.9       105
Positions are for J2000

Event circumstances last updated at 2019/06/08 12:53:44 UT

Marc W. Buie, Southwest Research Institute

RECON