RECON: TNO occultation with 500877

Event between (500877) 13JE64 and star GA0700:07888080 with event index number of 1434222

Geocentric closest approach at 2025/07/14 06:26:11 UTC

J2000 position of star is 17:05:47.3 -18:40:10
Equinox of date position of star is 17:06:56.2 -18:41:41
Stellar brightness G=15.8, use SENSEUP=128
Star is 77 degrees from the moon. Moon is 87% illuminated.
TNO apparent brightness V=24.1

[RECON map]
TNO is 38.6 AU from the Sun and 37.8 AU from the Earth.
The TNO is moving 19.1 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 449 seconds.
The 1-sigma cross-track error in the shadow position is 3020 km.
The sky-plane scale is 27415.0 km/arcsec.

The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 7.2 sec chord
Diameter=56.4 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 500877, (2025/07/14 06:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.6 -26:29:11  0.9 11.43  84
35Eta Oph      17:11:50.7 -15:45:17  2.6  3.14  76
29 Oph         17:03:21.1 -18:55:15  5.9  0.96  78
PPM 232626     17:08:38.6 -18:34:08  8.5  0.35  76
PPM 232575     17:06:11.6 -18:30:41  8.7  0.32  77
500877         17:07:17.1 -18:42:08 15.8        76
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 11.4 km RECON observability=1.0 and success probability=8.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:25:22 -15.2 AT Up 20.5 193.0 Low 06:10:22 - 06:40:22 -1894
Summerland 06:25:23 -15.4 AT Up 20.8 192.8 Low 06:10:23 - 06:40:23 -1905
Penticton 06:25:23 -15.5 AT Up 20.9 192.9 Low 06:10:23 - 06:40:23 -1909
Okanagan Falls 06:25:22 -15.7 AT Up 21.1 192.9 Low 06:10:22 - 06:40:22 -1916
Oliver 06:25:22 -15.9 AT Up 21.2 192.9 Low 06:10:22 - 06:40:22 -1924
Anarchist Mountain Observatory 06:25:21 -16.1 AT Up 21.4 193.1 Low 06:10:21 - 06:40:21 -1932
Oroville 06:25:21 -16.1 AT Up 21.4 193.1 Low 06:10:21 - 06:40:21 -1935
Tonasket 06:25:21 -16.3 AT Up 21.7 193.1 Low 06:10:21 - 06:40:21 -1945
Okanogan 06:25:22 -16.6 AT Up 22.0 193.0 Low 06:10:22 - 06:40:22 -1959
Brewster 06:25:22 -16.8 AT Up 22.3 192.8 Low 06:10:22 - 06:40:22 -1970
Manson/Chelan 06:25:23 -16.9 AT Up 22.6 192.4 Low 06:10:23 - 06:40:23 -1977
Wenatchee 06:25:24 -17.3 AT Up 23.1 192.3 Low 06:10:24 - 06:40:24 -1998
Ellensburg 06:25:24 -17.6 AT Up 23.5 192.1 Low 06:10:24 - 06:40:24 -2015
Yakima 06:25:23 -17.9 AT Up 23.9 192.1 Low 06:10:23 - 06:40:23 -2034
Toppenish/White Swan 06:25:23 -18.2 Dark Up 24.1 192.3 Low 06:10:23 - 06:40:23 -2045
Pasco 06:25:18 -18.6 Dark Up 24.0 193.6 Low 06:10:18 - 06:40:18 -2058
Goldendale 06:25:24 -18.6 Dark Up 24.7 192.0 Low 06:10:24 - 06:40:24 -2070
PNWRO 06:25:17 -18.9 Dark Up 24.2 193.9 Low 06:10:17 - 06:40:17 -2072
The Dalles 06:25:26 -18.6 Dark Up 24.9 191.6 Low 06:10:26 - 06:40:26 -2079
Maupin 06:25:25 -19.1 Dark Up 25.3 191.8 Low 06:10:25 - 06:40:25 -2100
Madras/Culver 06:25:25 -19.5 Dark Up 25.9 191.8 Low 06:10:25 - 06:40:25 -2127
Sisters 06:25:26 -19.7 Dark Up 26.3 191.3 Low 06:10:26 - 06:40:26 -2142
Redmond 06:25:24 -19.8 Dark Up 26.2 191.7 Low 06:10:24 - 06:40:24 -2145
Bend 06:25:25 -20.0 Dark Up 26.5 191.6 Low 06:10:25 - 06:40:25 -2155
Oregon Observatory 06:25:25 -20.1 Dark Up 26.7 191.5 Low 06:10:25 - 06:40:25 -2163
La Pine/Gilchrist 06:25:25 -20.3 Dark Up 26.9 191.5 Low 06:10:25 - 06:40:25 -2174
North Lake 06:25:23 -20.8 Dark Up 27.2 192.1 Low 06:10:23 - 06:40:23 -2200
Chiloquin 06:25:26 -21.1 Dark Up 28.0 191.2 Low 06:10:26 - 06:40:26 -2231
Paisley 06:25:20 -21.5 Dark Up 27.7 192.6 Low 06:10:20 - 06:40:20 -2231
Klamath Falls 06:25:25 -21.5 Dark Up 28.3 191.3 Low 06:10:25 - 06:40:25 -2250
Lakeview 06:25:19 -22.0 Dark Up 28.2 192.8 Low 06:10:19 - 06:40:19 -2259
Tulelake 06:25:24 -21.8 Dark Up 28.6 191.7 Low 06:10:24 - 06:40:24 -2266
Cedarville 06:25:18 -22.6 Dark Up 28.8 193.1 Low 06:10:18 - 06:40:18 -2297
Fall River/Burney 06:25:23 -22.7 Dark Up 29.4 191.8 Low 06:10:23 - 06:40:23 -2317
Susanville 06:25:19 -23.5 Dark Up 29.9 192.7 Low 06:10:19 - 06:40:19 -2357
Greenville 06:25:21 -23.6 Dark Up 30.3 192.4 Up 06:10:21 - 06:40:21 -2371
Gimple 06:25:20 -23.6 Dark Up 30.2 192.5 Up 06:10:20 - 06:40:20 -2372
Quincy 06:25:20 -23.8 Dark Up 30.5 192.5 Up 06:10:20 - 06:40:20 -2383
Portola 06:25:18 -24.1 Dark Up 30.5 193.0 Up 06:10:18 - 06:40:18 -2393
Reno 06:25:15 -24.5 Dark Up 30.6 193.7 Up 06:10:15 - 06:40:15 -2413
Carson City 06:25:15 -24.9 Dark Up 31.0 193.8 Up 06:10:15 - 06:40:15 -2434
Gardnerville 06:25:14 -25.1 Dark Up 31.2 193.9 Up 06:10:14 - 06:40:14 -2449
Yerington 06:25:12 -25.2 Dark Up 31.1 194.5 Up 06:10:12 - 06:40:12 -2450
Hawthorne 06:25:09 -25.8 Dark Up 31.4 195.1 Up 06:10:09 - 06:40:09 -2481
Lee Vining 06:25:11 -26.2 Dark Up 32.0 194.7 Up 06:10:11 - 06:40:11 -2513
Tonopah 06:25:03 -26.7 Dark Up 31.6 196.7 Up 06:10:03 - 06:40:03 -2520
SwRI 06:24:15 -27.6 Dark Up 26.3 208.4 Low 06:09:15 - 06:39:15 -2521
Bishop 06:25:07 -27.0 Dark Up 32.5 195.6 Up 06:10:07 - 06:40:07 -2555
Beatty 06:24:59 -27.9 Dark Up 32.6 197.4 Up 06:09:59 - 06:39:59 -2596
Lone Pine 06:25:05 -27.8 Dark Up 33.1 196.0 Up 06:10:05 - 06:40:05 -2605
Indian Springs 06:24:54 -28.5 Dark Up 32.6 198.6 Up 06:09:54 - 06:39:54 -2626
Henderson 06:24:51 -29.2 Dark Up 32.9 199.5 Up 06:09:51 - 06:39:51 -2666
CPSLO 06:25:16 -28.0 Dark Up 34.9 193.4 Up 06:10:16 - 06:40:16 -2672
Searchlight/Boulder City 06:24:50 -29.8 Dark Up 33.5 199.6 Up 06:09:50 - 06:39:50 -2704
Patrick 06:24:45 -30.1 Dark Up 33.2 200.8 Up 06:09:45 - 06:39:45 -2717
Laughlin/Bullhead City 06:24:48 -30.2 Dark Up 33.6 200.1 Up 06:09:48 - 06:39:48 -2727
Kingman/Dolan Springs 06:24:46 -30.3 Dark Up 33.5 200.6 Up 06:09:46 - 06:39:46 -2730
Mohave Valley 06:24:48 -30.4 Dark Up 33.9 200.1 Up 06:09:48 - 06:39:48 -2745
Wildwood 06:25:06 -29.9 Dark Up 35.7 195.9 Up 06:10:06 - 06:40:06 -2766
Lake Havasu City 06:24:46 -30.9 Dark Up 34.2 200.5 Up 06:09:46 - 06:39:46 -2774
Parker 06:24:46 -31.2 Dark Up 34.5 200.6 Up 06:09:46 - 06:39:46 -2798
Idyllwild 06:24:56 -30.8 Dark Up 35.6 198.1 Up 06:09:56 - 06:39:56 -2805
Blythe 06:24:47 -31.6 Dark Up 35.1 200.4 Up 06:09:47 - 06:39:47 -2832
George/Scottsdale 06:24:34 -32.3 Dark Up 34.2 203.3 Up 06:09:34 - 06:39:34 -2852
Calipatria 06:24:51 -31.8 Dark Up 35.8 199.5 Up 06:09:51 - 06:39:51 -2857
Yuma 06:24:46 -32.4 Dark Up 36.0 200.6 Up 06:09:46 - 06:39:46 -2895

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 500877, (2025/07/14 06:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 11.43  84
35Eta Oph      17:10:22.7 -15:43:29  2.6  3.14  76
29 Oph         17:01:51.2 -18:53:08  5.9  0.96  78
PPM 232626     17:07:08.9 -18:32:13  8.5  0.35  76
PPM 232575     17:04:42.0 -18:28:40  8.7  0.32  77
500877         17:05:47.3 -18:40:10 15.8        77
Positions are for J2000

Event circumstances last updated at 2019/08/05 23:42:29 UT

Marc W. Buie, Southwest Research Institute

RECON