RECON: TNO occultation with 04VK78

Event between 04VK78 and star GA1120:01364664 with event index number of 1626105

Geocentric closest approach at 2026/10/29 09:11:53 UTC

J2000 position of star is 05:40:33.5 +23:47:50
Equinox of date position of star is 05:41:55.2 +23:48:27
Stellar brightness G=14.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 7 degrees from the moon. Moon is 86% illuminated.
TNO apparent brightness V=23.7

[RECON map]
TNO is 37.3 AU from the Sun and 36.6 AU from the Earth.
The TNO is moving 14.4 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 997 seconds.
The 1-sigma cross-track error in the shadow position is 3328 km.
The sky-plane scale is 26571.0 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=161.4 km assuming a 5% albedo -- 11.2 sec chord
Diameter=65.9 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 04VK78, (2026/10/29 09:12UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:37.5 +07:24:35  0.4 16.76  23
Alnath         05:27:59.4 +28:37:40  1.6  5.78   3
PPM 094690     05:43:32.7 +23:20:15  6.5  0.56   8
PPM 094629     05:41:30.1 +24:14:18  7.4  0.46   7
PPM 094632     05:41:32.7 +23:42:30  9.0  0.18   7
04VK78         05:42:11.7 +23:48:34 14.5         8
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 0.9 sigma about the mid-time.
The median site spacing is 28.3 km RECON observability=1.0 and success probability=12.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 09:14:09 -48.7 Dark Up 54.9 129.0 Up 08:59:09 - 09:29:09 -2534
Sleaford 09:13:03 -41.7 Dark Up 59.5 152.1 Up 08:58:03 - 09:28:03 -2561
Kelowna 09:14:08 -49.0 Dark Up 55.8 129.3 Up 08:59:08 - 09:29:08 -2624
Peachland 09:14:09 -49.2 Dark Up 55.8 128.8 Up 08:59:09 - 09:29:09 -2630
Summerland 09:14:09 -49.3 Dark Up 55.9 128.7 Up 08:59:09 - 09:29:09 -2646
Penticton 09:14:09 -49.3 Dark Up 56.0 128.8 Up 08:59:09 - 09:29:09 -2654
Oliver 09:14:10 -49.6 Dark Up 56.2 128.4 Up 08:59:10 - 09:29:10 -2687
Victoria 09:14:29 -51.5 Dark Up 54.6 122.7 Up 08:59:29 - 09:29:29 -2691
Anarchist Mountain Observatory 09:14:10 -49.7 Dark Up 56.4 128.4 Up 08:59:10 - 09:29:10 -2707
Tonasket 09:14:11 -49.9 Dark Up 56.6 128.0 Up 08:59:11 - 09:29:11 -2735
Okanogan 09:14:13 -50.3 Dark Up 56.7 127.4 Up 08:59:13 - 09:29:13 -2766
Brewster 09:14:14 -50.6 Dark Up 56.8 126.8 Up 08:59:14 - 09:29:14 -2789
Manson/Chelan 09:14:16 -50.9 Dark Up 56.7 126.1 Up 08:59:16 - 09:29:16 -2804
Wenatchee 09:14:18 -51.3 Dark Up 56.9 125.2 Up 08:59:18 - 09:29:18 -2847
Ellensburg 09:14:21 -51.7 Dark Up 57.0 124.4 Up 08:59:21 - 09:29:21 -2884
Yakima 09:14:22 -52.1 Dark Up 57.2 123.9 Up 08:59:22 - 09:29:22 -2924
Toppenish/White Swan 09:14:21 -52.2 Dark Up 57.5 123.8 Up 08:59:21 - 09:29:21 -2948
Goldendale 09:14:25 -52.8 Dark Up 57.5 122.6 Up 08:59:25 - 09:29:25 -2995
PNWRO 09:14:16 -51.8 Dark Up 58.5 125.4 Up 08:59:16 - 09:29:16 -3007
The Dalles 09:14:27 -53.1 Dark Up 57.4 121.8 Up 08:59:27 - 09:29:27 -3011
Maupin 09:14:28 -53.4 Dark Up 57.7 121.4 Up 08:59:28 - 09:29:28 -3054
Sisters 09:14:33 -54.3 Dark Up 57.9 119.6 Up 08:59:33 - 09:29:33 -3133
Bend 09:14:32 -54.4 Dark Up 58.2 119.6 Up 08:59:32 - 09:29:32 -3161
Oregon Observatory 09:14:33 -54.6 Dark Up 58.2 119.2 Up 08:59:33 - 09:29:33 -3176
North Lake 09:14:32 -54.9 Dark Up 58.8 118.9 Up 08:59:32 - 09:29:32 -3250
Chiloquin 09:14:39 -55.8 Dark Up 58.5 116.8 Up 08:59:39 - 09:29:39 -3301
Klamath Falls 09:14:39 -56.0 Dark Up 58.7 116.4 Up 08:59:39 - 09:29:39 -3337
Lakeview 09:14:33 -55.4 Dark Up 59.7 118.1 Up 08:59:33 - 09:29:33 -3366
Cedarville 09:14:33 -55.8 Dark Up 60.1 117.3 Up 08:59:33 - 09:29:33 -3435
Fall River/Burney 09:14:41 -56.8 Dark Up 59.5 115.1 Up 08:59:41 - 09:29:41 -3464
Susanville 09:14:38 -56.9 Dark Up 60.3 115.0 Up 08:59:38 - 09:29:38 -3541
Greenville 09:14:40 -57.2 Dark Up 60.2 114.2 Up 08:59:40 - 09:29:40 -3564
Gimple 09:14:40 -57.2 Dark Up 60.3 114.3 Up 08:59:40 - 09:29:40 -3566
Quincy 09:14:41 -57.4 Dark Up 60.3 113.9 Up 08:59:41 - 09:29:41 -3585
Portola 09:14:39 -57.2 Dark Up 60.7 114.3 Up 08:59:39 - 09:29:39 -3606
Reno 09:14:36 -57.1 Dark Up 61.2 114.6 Up 08:59:36 - 09:29:36 -3645
Carson City 09:14:37 -57.3 Dark Up 61.4 114.0 Up 08:59:37 - 09:29:37 -3682
Gardnerville 09:14:37 -57.5 Dark Up 61.5 113.7 Up 08:59:37 - 09:29:37 -3708
Yerington 09:14:34 -57.1 Dark Up 61.9 114.5 Up 08:59:34 - 09:29:34 -3713
Dunrhomin 09:13:17 -47.9 Dark Up 69.6 139.6 Up 08:58:17 - 09:28:17 -3766
Hawthorne 09:14:32 -57.1 Dark Up 62.5 114.3 Up 08:59:32 - 09:29:32 -3771
CU-SBO 09:13:17 -48.1 Dark Up 69.8 139.0 Up 08:58:17 - 09:28:17 -3791
Lee Vining 09:14:36 -57.8 Dark Up 62.4 112.7 Up 08:59:36 - 09:29:36 -3821
Tonopah 09:14:26 -56.6 Dark Up 63.7 115.2 Up 08:59:26 - 09:29:26 -3843
Bishop 09:14:33 -57.8 Dark Up 63.1 112.5 Up 08:59:33 - 09:29:33 -3896
Beatty 09:14:26 -57.1 Dark Up 64.5 113.6 Up 08:59:26 - 09:29:26 -3972
Indian Springs 09:14:21 -56.6 Dark Up 65.4 114.4 Up 08:59:21 - 09:29:21 -4023
Henderson 09:14:18 -56.5 Dark Up 66.1 114.2 Up 08:59:18 - 09:29:18 -4091
Patrick 09:14:13 -56.1 Dark Up 67.2 114.4 Up 08:59:13 - 09:29:13 -4174
Laughlin/Bullhead City 09:14:17 -56.7 Dark Up 66.7 112.9 Up 08:59:17 - 09:29:17 -4190
Kingman/Dolan Springs 09:14:14 -56.4 Dark Up 67.1 113.6 Up 08:59:14 - 09:29:14 -4195
Mohave Valley 09:14:18 -56.9 Dark Up 66.9 112.3 Up 08:59:18 - 09:29:18 -4219
Wildwood 09:14:41 -60.0 Dark Up 64.1 106.1 Up 08:59:41 - 09:29:41 -4237
Lake Havasu City 09:14:17 -56.9 Dark Up 67.2 111.8 Up 08:59:17 - 09:29:17 -4265
Parker 09:14:17 -57.1 Dark Up 67.3 111.0 Up 08:59:17 - 09:29:17 -4303
Idyllwild 09:14:31 -58.9 Dark Up 65.6 107.3 Up 08:59:31 - 09:29:31 -4308
George/Scottsdale 09:14:05 -55.6 Dark Up 69.3 113.3 Up 08:59:05 - 09:29:05 -4385
Calipatria 09:14:26 -58.5 Dark Up 66.7 107.3 Up 08:59:26 - 09:29:26 -4393
Yuma 09:14:22 -58.0 Dark Up 67.6 107.4 Up 08:59:22 - 09:29:22 -4454

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 04VK78, (2026/10/29 09:12UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 16.76  23
Alnath         05:26:17.6 +28:36:23  1.6  5.78   3
PPM 094690     05:41:54.8 +23:19:34  6.5  0.56   8
PPM 094629     05:39:51.5 +24:13:32  7.4  0.46   7
PPM 094632     05:39:54.5 +23:41:45  9.0  0.18   7
04VK78         05:40:33.5 +23:47:50 14.5         7
Positions are for J2000

Event circumstances last updated at 2022/04/23 23:05:33 UT

Marc W. Buie, Southwest Research Institute

RECON