RECON: TNO occultation with 523718

Event between (523718) 14KZ101 and star GA0840:07759024 with event index number of 1379550

Geocentric closest approach at 2025/07/05 09:19:10 UTC

J2000 position of star is 18:16:16.2 -05:40:23
Equinox of date position of star is 18:17:18.5 -05:39:55
Stellar brightness G=15.3, use SENSEUP=128
Star is 56 degrees from the moon. Moon is 74% illuminated.
TNO apparent brightness V=21.9

[RECON map]
TNO is 35.7 AU from the Sun and 34.7 AU from the Earth.
The TNO is moving 22.7 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 328 seconds.
The 1-sigma cross-track error in the shadow position is 1488 km.
The sky-plane scale is 25195.9 km/arcsec.

The TNO has an absolute magnitude Hv=6.4
Diameter=316.2 km assuming a 5% albedo -- 13.9 sec chord
Diameter=129.1 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 523718, (2025/07/05 09:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.5 -26:29:11  0.9 32.86  28
60Bet Oph      17:44:44.0 +04:33:30  2.8 13.11  53
PPM 201730     18:26:05.0 -07:03:37  6.5  2.52  58
PPM 201549     18:16:56.0 -05:27:55  7.4  0.26  56
PPM 201563     18:17:46.6 -05:42:45  9.7  0.06  56
523718         18:17:38.0 -05:39:46 15.3        56
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 2.7 sigma about the mid-time.
The median site spacing is 17.2 km RECON observability=1.0 and success probability=26.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 09:17:13 -15.5 AT Down 28.8 214.0 Low 09:02:13 - 09:32:13 321
Summerland 09:17:13 -15.8 AT Down 29.2 213.8 Low 09:02:13 - 09:32:13 303
Penticton 09:17:13 -15.9 AT Down 29.2 213.9 Low 09:02:13 - 09:32:13 298
Okanagan Falls 09:17:12 -16.0 AT Down 29.4 214.0 Low 09:02:12 - 09:32:12 285
Oliver 09:17:12 -16.2 AT Down 29.5 214.0 Low 09:02:12 - 09:32:12 273
Anarchist Mountain Observatory 09:17:11 -16.3 AT Down 29.6 214.3 Low 09:02:11 - 09:32:11 259
Oroville 09:17:11 -16.4 AT Down 29.7 214.2 Low 09:02:11 - 09:32:11 255
Tonasket 09:17:11 -16.6 AT Down 29.9 214.3 Low 09:02:11 - 09:32:11 238
Okanogan 09:17:11 -17.0 AT Down 30.2 214.3 Up 09:02:11 - 09:32:11 216
Brewster 09:17:11 -17.3 AT Down 30.5 214.1 Up 09:02:11 - 09:32:11 199
Manson/Chelan 09:17:12 -17.5 AT Down 30.8 213.8 Up 09:02:12 - 09:32:12 189
Entiat 09:17:12 -17.8 AT Down 31.0 213.8 Up 09:02:12 - 09:32:12 174
Wenatchee 09:17:12 -18.0 Dark Down 31.3 213.8 Up 09:02:12 - 09:32:12 157
Ellensburg 09:17:12 -18.5 Dark Down 31.7 213.7 Up 09:02:12 - 09:32:12 129
Yakima 09:17:11 -18.9 Dark Down 32.0 213.8 Up 09:02:11 - 09:32:11 100
Toppenish/White Swan 09:17:11 -19.0 Dark Down 32.1 214.1 Up 09:02:11 - 09:32:11 82
Pasco 09:17:07 -18.9 Dark Down 31.7 215.5 Up 09:02:07 - 09:32:07 57
Goldendale 09:17:11 -19.7 Dark Down 32.8 213.8 Up 09:02:11 - 09:32:11 46
PNWRO 09:17:06 -19.1 Dark Down 31.9 215.8 Up 09:02:06 - 09:32:06 36
George/Umatilla 09:17:07 -19.3 Dark Down 32.1 215.3 Up 09:02:07 - 09:32:07 35
The Dalles 09:17:12 -19.9 Dark Down 33.1 213.5 Up 09:02:12 - 09:32:12 34
Maupin 09:17:11 -20.3 Dark Down 33.4 213.7 Up 09:02:11 - 09:32:11 1
Madras/Culver 09:17:11 -20.9 Dark Down 33.9 213.9 Up 09:02:11 - 09:32:11 -39
Sisters 09:17:12 -21.3 Dark Down 34.3 213.5 Up 09:02:12 - 09:32:12 -59
Redmond 09:17:11 -21.2 Dark Down 34.2 214.0 Up 09:02:11 - 09:32:11 -66
Bend 09:17:11 -21.4 Dark Down 34.4 213.9 Up 09:02:11 - 09:32:11 -81
Oregon Observatory 09:17:11 -21.6 Dark Down 34.6 213.8 Up 09:02:11 - 09:32:11 -92
La Pine/Gilchrist 09:17:11 -21.8 Dark Down 34.8 213.8 Up 09:02:11 - 09:32:11 -107
North Lake 09:17:09 -22.1 Dark Down 34.9 214.7 Up 09:02:09 - 09:32:09 -149
Chiloquin 09:17:11 -23.0 Dark Down 35.9 213.9 Up 09:02:11 - 09:32:11 -189
Paisley 09:17:07 -22.6 Dark Down 35.2 215.3 Up 09:02:07 - 09:32:07 -196
Klamath Falls 09:17:10 -23.3 Dark Down 36.1 214.1 Up 09:02:10 - 09:32:10 -217
Lakeview 09:17:06 -23.0 Dark Down 35.6 215.7 Up 09:02:06 - 09:32:06 -239
Tulelake 09:17:09 -23.5 Dark Down 36.2 214.5 Up 09:02:09 - 09:32:09 -242
Cedarville 09:17:04 -23.6 Dark Down 36.0 216.2 Up 09:02:04 - 09:32:04 -294
Fall River/Burney 09:17:08 -24.3 Dark Down 37.0 215.0 Up 09:02:08 - 09:32:08 -316
Susanville 09:17:05 -24.8 Dark Down 37.1 216.1 Up 09:02:05 - 09:32:05 -377
Greenville 09:17:06 -25.1 Dark Down 37.5 215.9 Up 09:02:06 - 09:32:06 -396
Gimple 09:17:05 -25.1 Dark Down 37.5 216.0 Up 09:02:05 - 09:32:05 -397
Quincy 09:17:05 -25.3 Dark Down 37.7 216.0 Up 09:02:05 - 09:32:05 -412
Portola 09:17:04 -25.3 Dark Down 37.5 216.6 Up 09:02:04 - 09:32:04 -429
Reno 09:17:01 -25.4 Dark Down 37.5 217.4 Up 09:02:01 - 09:32:01 -460
Carson City 09:17:01 -25.8 Dark Down 37.7 217.6 Up 09:02:01 - 09:32:01 -490
Gardnerville 09:17:00 -26.0 Dark Down 37.9 217.8 Up 09:02:00 - 09:32:00 -511
Yerington 09:16:59 -25.8 Dark Down 37.6 218.4 Up 09:01:59 - 09:31:59 -515
Hawthorne 09:16:56 -26.1 Dark Down 37.7 219.2 Up 09:01:56 - 09:31:56 -561
Lee Vining 09:16:57 -26.7 Dark Down 38.4 218.9 Up 09:01:57 - 09:31:57 -602
Niwot 09:16:19 -20.1 Dark Down 29.3 231.7 Low 09:01:19 - 09:31:19 -613
SwRI 09:16:19 -20.3 Dark Down 29.4 231.6 Low 09:01:19 - 09:31:19 -620
Tonopah 09:16:51 -26.1 Dark Down 37.4 220.9 Up 09:01:51 - 09:31:51 -620
Bishop 09:16:55 -27.1 Dark Down 38.5 220.0 Up 09:01:55 - 09:31:55 -663
Beatty 09:16:48 -27.1 Dark Down 38.0 222.0 Up 09:01:48 - 09:31:48 -726
Lone Pine 09:16:52 -27.7 Dark Down 38.9 220.8 Up 09:01:52 - 09:31:52 -733
Indian Springs 09:16:45 -27.0 Dark Down 37.6 223.3 Up 09:01:45 - 09:31:45 -770
CPSLO 09:17:00 -29.6 Dark Down 41.2 218.6 Up 09:02:00 - 09:32:00 -809
Henderson 09:16:42 -27.3 Dark Down 37.7 224.3 Up 09:01:42 - 09:31:42 -827
Searchlight/Boulder City 09:16:41 -27.8 Dark Down 38.0 224.7 Up 09:01:41 - 09:31:41 -878
Patrick 09:16:38 -27.5 Dark Down 37.5 225.8 Up 09:01:38 - 09:31:38 -898
Laughlin/Bullhead City 09:16:40 -28.0 Dark Down 38.0 225.2 Up 09:01:40 - 09:31:40 -909
Kingman/Dolan Springs 09:16:38 -27.8 Dark Down 37.7 225.7 Up 09:01:38 - 09:31:38 -915
Mohave Valley 09:16:39 -28.2 Dark Down 38.2 225.3 Up 09:01:39 - 09:31:39 -934
DCO 09:16:35 -27.5 Dark Down 37.3 226.6 Up 09:01:35 - 09:31:35 -936
Wildwood 09:16:52 -30.2 Dark Down 41.1 221.6 Up 09:01:52 - 09:31:52 -946
Lake Havasu City 09:16:38 -28.5 Dark Down 38.4 225.8 Up 09:01:38 - 09:31:38 -973
Parker 09:16:38 -28.8 Dark Down 38.6 226.0 Up 09:01:38 - 09:31:38 -1005
Idyllwild 09:16:45 -30.0 Dark Down 40.3 223.8 Up 09:01:45 - 09:31:45 -1006
Blythe 09:16:38 -29.4 Dark Down 39.1 226.0 Up 09:01:38 - 09:31:38 -1048
Calipatria 09:16:41 -30.2 Dark Down 40.0 225.4 Up 09:01:41 - 09:31:41 -1079
Yuma 09:16:37 -30.2 Dark Down 39.8 226.5 Up 09:01:37 - 09:31:37 -1132

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 523718, (2025/07/05 09:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.86  28
60Bet Oph      17:43:28.3 +04:34:05  2.8 13.11  53
PPM 201730     18:24:42.3 -07:04:34  6.5  2.52  58
PPM 201549     18:15:34.3 -05:28:31  7.4  0.26  56
PPM 201563     18:16:24.8 -05:43:23  9.7  0.06  56
523718         18:16:16.2 -05:40:23 15.3        56
Positions are for J2000

Event circumstances last updated at 2019/06/08 12:36:41 UT

Marc W. Buie, Southwest Research Institute

RECON