RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1380:02184014 with event index number of 2628213

Geocentric closest approach at 2025/12/01 04:25:55 UTC

J2000 position of star is 03:58:38.0 +48:26:07
Equinox of date position of star is 04:00:16.2 +48:29:52
Stellar brightness G=14.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 55 degrees from the moon. Moon is 80% illuminated.
TNO apparent brightness V=21.9

[RECON map]
TNO is 14.8 AU from the Sun and 13.9 AU from the Earth.
The TNO is moving 30.7 km/sec on the sky relative to the star, or, 10.9 arcsec/hr.
The 1-sigma error in the time of the event is 87 seconds.
The 1-sigma cross-track error in the shadow position is 3809 km.
The sky-plane scale is 10090.3 km/arcsec.

The TNO has an absolute magnitude Hv=10.1
Diameter=57.5 km assuming a 5% albedo -- 1.8 sec chord
Diameter=23.5 km assuming a 30% albedo -- 0.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 517717, (2025/12/01 04:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.6 +16:33:34  0.8 32.83  54
Mirphak        03:26:11.2 +49:57:04  1.8  5.79  51
PPM 046639     03:57:50.8 +47:56:42  5.2  0.72  55
PPM 046679     04:01:15.1 +48:50:03  8.2  0.35  55
PPM 046665     04:00:01.7 +48:23:05  9.3  0.15  55
517717         04:00:31.5 +48:30:27 14.7        55
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 19.9 km RECON observability=1.0 and success probability=10.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 04:26:58 -39.8 Dark Up 59.9 72.5 Up 04:19:15 - 04:34:40 4460
Kamloops 04:26:58 -41.2 Dark Up 62.4 77.7 Up 04:19:15 - 04:34:40 4384
Peachland 04:26:58 -41.9 Dark Up 62.6 76.2 Up 04:19:15 - 04:34:40 4301
Kelowna 04:26:58 -42.0 Dark Up 62.8 76.6 Up 04:19:15 - 04:34:40 4290
Summerland 04:26:58 -42.0 Dark Up 62.6 76.0 Up 04:19:15 - 04:34:40 4288
Penticton 04:26:58 -42.0 Dark Up 62.7 75.9 Up 04:19:15 - 04:34:40 4278
Oliver 04:26:58 -42.1 Dark Up 62.6 75.3 Up 04:19:15 - 04:34:40 4259
Anarchist Mountain Observatory 04:26:58 -42.3 Dark Up 62.6 75.0 Up 04:19:15 - 04:34:40 4239
Manson/Chelan 04:26:58 -42.1 Dark Up 61.8 72.7 Up 04:19:15 - 04:34:40 4230
Tonasket 04:26:58 -42.4 Dark Up 62.5 74.4 Up 04:19:15 - 04:34:40 4227
Okanogan 04:26:58 -42.3 Dark Up 62.3 73.8 Up 04:19:15 - 04:34:40 4219
Wenatchee 04:26:58 -42.1 Dark Up 61.6 71.8 Up 04:19:15 - 04:34:40 4218
Brewster 04:26:58 -42.3 Dark Up 62.1 73.2 Up 04:19:15 - 04:34:40 4218
Ellensburg 04:26:58 -42.1 Dark Up 61.3 71.0 Up 04:19:15 - 04:34:40 4212
Yakima 04:26:58 -42.1 Dark Up 61.2 70.3 Up 04:19:15 - 04:34:40 4195
Toppenish/White Swan 04:26:58 -42.3 Dark Up 61.2 70.0 Up 04:19:15 - 04:34:40 4174
The Dalles 04:27:16 -42.0 Dark Up 60.5 68.5 Up 04:19:34 - 04:34:59 4151
Goldendale 04:27:15 -42.2 Dark Up 60.8 68.9 Up 04:19:33 - 04:34:58 4141
Maupin 04:27:18 -42.1 Dark Up 60.4 67.8 Up 04:19:35 - 04:35:00 4121
Sisters 04:27:21 -42.0 Dark Up 59.7 66.3 Up 04:19:38 - 04:35:03 4102
Bend 04:27:21 -42.2 Dark Up 59.8 66.0 Up 04:19:39 - 04:35:04 4071
Oregon Observatory 04:27:22 -42.1 Dark Up 59.6 65.7 Up 04:19:39 - 04:35:04 4070
PNWRO 04:26:58 -43.4 Dark Up 62.0 69.7 Up 04:19:15 - 04:34:40 4059
Chiloquin 04:27:26 -42.1 Dark Up 58.8 63.6 Up 04:19:44 - 04:35:09 4021
North Lake 04:27:23 -42.7 Dark Up 59.7 64.8 Up 04:19:41 - 04:35:06 3998
Klamath Falls 04:27:27 -42.2 Dark Up 58.7 63.1 Up 04:19:45 - 04:35:10 3996
Fall River/Burney 04:27:30 -42.6 Dark Up 58.4 61.4 Up 04:19:48 - 04:35:13 3901
Lakeview 04:27:26 -43.2 Dark Up 59.6 63.2 Up 04:19:43 - 04:35:08 3899
Cedarville 04:27:27 -43.5 Dark Up 59.5 62.2 Up 04:19:45 - 04:35:10 3848
Greenville 04:27:32 -43.1 Dark Up 58.3 60.2 Up 04:19:50 - 04:35:15 3817
Susanville 04:27:31 -43.3 Dark Up 58.6 60.6 Up 04:19:49 - 04:35:14 3813
Gimple 04:27:32 -43.2 Dark Up 58.3 60.2 Up 04:19:50 - 04:35:15 3811
Quincy 04:27:33 -43.1 Dark Up 58.2 59.9 Up 04:19:50 - 04:35:15 3804
Portola 04:27:33 -43.5 Dark Up 58.4 59.7 Up 04:19:50 - 04:35:15 3764
Reno 04:27:33 -44.0 Dark Up 58.7 59.4 Up 04:19:50 - 04:35:15 3704
Sleaford 04:26:39 -48.8 Dark Up 71.5 89.9 Up 04:18:57 - 04:34:22 3696
Carson City 04:27:34 -44.1 Dark Up 58.6 58.9 Up 04:19:51 - 04:35:16 3680
Gardnerville 04:27:34 -44.2 Dark Up 58.5 58.5 Up 04:19:52 - 04:35:17 3661
Yerington 04:27:34 -44.6 Dark Up 58.9 58.6 Up 04:19:51 - 04:35:16 3624
Hawthorne 04:27:35 -45.1 Dark Up 59.0 57.9 Up 04:19:52 - 04:35:17 3558
Lee Vining 04:27:37 -44.8 Dark Up 58.4 57.1 Up 04:19:54 - 04:35:19 3557
Bishop 04:27:37 -45.4 Dark Up 58.5 56.2 Up 04:19:55 - 04:35:20 3468
Tonopah 04:27:34 -46.3 Dark Up 59.7 57.1 Up 04:19:51 - 04:35:16 3431
Beatty 04:27:37 -46.8 Dark Up 59.3 55.4 Up 04:19:54 - 04:35:19 3323
Wildwood 04:27:46 -45.5 Dark Up 56.5 52.1 Up 04:20:04 - 04:35:29 3272
Indian Springs 04:27:36 -47.7 Dark Up 59.9 54.7 Up 04:19:53 - 04:35:18 3226
Henderson 04:27:36 -48.3 Dark Up 60.0 53.8 Up 04:19:54 - 04:35:19 3142
Idyllwild 04:27:45 -47.1 Dark Up 57.5 51.2 Up 04:20:02 - 04:35:27 3111
Laughlin/Bullhead City 04:27:38 -48.7 Dark Up 59.8 52.5 Up 04:19:56 - 04:35:21 3054
Mohave Valley 04:27:39 -48.8 Dark Up 59.6 52.1 Up 04:19:56 - 04:35:21 3035
Patrick 04:27:37 -49.3 Dark Up 60.4 52.6 Up 04:19:54 - 04:35:19 3020
Kingman/Dolan Springs 04:27:37 -49.1 Dark Up 60.1 52.4 Up 04:19:55 - 04:35:20 3019
Lake Havasu City 04:27:40 -49.0 Dark Up 59.5 51.5 Up 04:19:57 - 04:35:22 2990
Calipatria 04:27:45 -48.1 Dark Up 57.9 50.1 Up 04:20:03 - 04:35:28 2983
Parker 04:27:41 -49.1 Dark Up 59.3 51.0 Up 04:19:58 - 04:35:23 2963
Yuma 04:27:44 -48.9 Dark Up 58.2 49.3 Up 04:20:02 - 04:35:27 2888
Dunrhomin 04:26:58 -54.7 Dark Up 68.7 58.2 Up 04:19:15 - 04:34:40 2817
CU-SBO 04:26:58 -54.7 Dark Up 68.5 57.7 Up 04:19:15 - 04:34:40 2809
George/Scottsdale 04:27:38 -51.1 Dark Up 60.6 49.6 Up 04:19:55 - 04:35:20 2760

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 517717, (2025/12/01 04:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 32.83  54
Mirphak        03:24:19.4 +49:51:40  1.8  5.79  51
PPM 046639     03:55:58.2 +47:52:16  5.2  0.72  55
PPM 046679     03:59:21.2 +48:45:44  8.2  0.35  55
PPM 046665     03:58:08.3 +48:18:44  9.3  0.15  55
517717         03:58:38.0 +48:26:07 14.7        55
Positions are for J2000

Event circumstances last updated at 2022/06/07 22:32:44 UT

Marc W. Buie, Southwest Research Institute

RECON