RECON: TNO occultation with 04VK78

Event between 04VK78 and star GA1120:01305286 with event index number of 1638221

Geocentric closest approach at 2026/12/25 05:54:17 UTC

J2000 position of star is 05:35:36.5 +23:45:53
Equinox of date position of star is 05:36:48.5 +23:46:34
Stellar brightness G=11.0, use SENSEUP=4
Star is 26 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=23.8

[RECON map]
TNO is 37.3 AU from the Sun and 36.4 AU from the Earth.
The TNO is moving 24.7 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 1552 seconds.
The 1-sigma cross-track error in the shadow position is 4105 km.
The sky-plane scale is 26367.4 km/arcsec.

The TNO has an absolute magnitude Hv=8.1
Diameter=143.2 km assuming a 5% albedo -- 5.8 sec chord
Diameter=58.5 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 04VK78, (2026/12/25 05:54UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.3 +16:33:42  0.8 15.76  41
Alnath         05:28:00.0 +28:37:40  1.6  5.27  28
PPM 094690     05:43:33.3 +23:20:15  6.5  1.51  25
PPM 094515     05:36:42.7 +24:18:23  8.0  0.54  26
PPM 094523     05:36:58.5 +23:31:42  9.4  0.26  26
04VK78         05:37:15.3 +23:46:49 11.0        26
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 0.6 sigma about the mid-time.
The median site spacing is 22.9 km RECON observability=1.0 and success probability=10.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 05:55:13 -54.2 Dark Up 59.0 141.2 Up 05:40:13 - 06:10:13 4388
Kelowna 05:55:14 -54.3 Dark Up 59.3 140.5 Up 05:40:14 - 06:10:14 4353
Summerland 05:55:15 -54.4 Dark Up 59.4 139.9 Up 05:40:15 - 06:10:15 4330
Penticton 05:55:15 -54.5 Dark Up 59.5 140.0 Up 05:40:15 - 06:10:15 4322
Okanagan Falls 05:55:15 -54.6 Dark Up 59.6 139.8 Up 05:40:15 - 06:10:15 4304
Oliver 05:55:15 -54.7 Dark Up 59.8 139.6 Up 05:40:15 - 06:10:15 4288
Anarchist Mountain Observatory 05:55:15 -54.9 Dark Up 60.0 139.8 Up 05:40:15 - 06:10:15 4268
Oroville 05:55:15 -54.9 Dark Up 60.0 139.5 Up 05:40:15 - 06:10:15 4262
Tonasket 05:55:15 -55.0 Dark Up 60.2 139.3 Up 05:40:15 - 06:10:15 4239
Okanogan 05:55:16 -55.2 Dark Up 60.4 138.7 Up 05:40:16 - 06:10:16 4209
Brewster 05:55:16 -55.2 Dark Up 60.5 138.0 Up 05:40:16 - 06:10:16 4185
Manson/Chelan 05:55:18 -55.1 Dark Up 60.5 137.2 Up 05:40:18 - 06:10:18 4169
Entiat 05:55:19 -55.2 Dark Up 60.6 136.8 Up 05:40:19 - 06:10:19 4149
Wenatchee 05:55:20 -55.3 Dark Up 60.7 136.3 Up 05:40:20 - 06:10:20 4125
Ellensburg 05:55:20 -55.4 Dark Up 60.9 135.5 Up 05:40:20 - 06:10:20 4087
Yakima 05:55:22 -55.6 Dark Up 61.2 134.9 Up 05:40:22 - 06:10:22 4047
Toppenish/White Swan 05:55:21 -55.8 Dark Up 61.5 134.9 Up 05:40:21 - 06:10:21 4023
Pasco 05:55:18 -56.6 Dark Up 62.1 136.9 Up 05:40:18 - 06:10:18 3994
Goldendale 05:55:23 -55.8 Dark Up 61.6 133.5 Up 05:40:23 - 06:10:23 3975
PNWRO 05:55:17 -56.9 Dark Up 62.4 136.9 Up 05:40:17 - 06:10:17 3966
The Dalles 05:55:25 -55.7 Dark Up 61.6 132.6 Up 05:40:25 - 06:10:25 3958
Maupin 05:55:25 -56.0 Dark Up 61.9 132.2 Up 05:40:25 - 06:10:25 3914
Madras/Culver 05:55:26 -56.2 Dark Up 62.3 131.4 Up 05:40:26 - 06:10:26 3860
Sisters 05:55:26 -56.1 Dark Up 62.3 130.2 Up 05:40:26 - 06:10:26 3833
Redmond 05:55:26 -56.4 Dark Up 62.5 130.8 Up 05:40:26 - 06:10:26 3825
Bend 05:55:26 -56.4 Dark Up 62.6 130.3 Up 05:40:26 - 06:10:26 3805
Oregon Observatory 05:55:26 -56.4 Dark Up 62.6 129.8 Up 05:40:26 - 06:10:26 3790
La Pine/Gilchrist 05:55:26 -56.4 Dark Up 62.7 129.4 Up 05:40:26 - 06:10:26 3770
North Lake 05:55:26 -57.0 Dark Up 63.3 129.7 Up 05:40:26 - 06:10:26 3717
Chiloquin 05:55:26 -56.7 Dark Up 63.2 127.1 Up 05:40:26 - 06:10:26 3665
Paisley 05:55:26 -57.5 Dark Up 63.9 129.4 Up 05:40:26 - 06:10:26 3656
Klamath Falls 05:55:26 -56.9 Dark Up 63.4 126.7 Up 05:40:26 - 06:10:26 3629
Lakeview 05:55:26 -57.8 Dark Up 64.3 129.0 Up 05:40:26 - 06:10:26 3601
Tulelake 05:55:26 -57.2 Dark Up 63.8 126.8 Up 05:40:26 - 06:10:26 3596
Cedarville 05:55:26 -58.2 Dark Up 64.8 128.2 Up 05:40:26 - 06:10:26 3531
Fall River/Burney 05:55:26 -57.6 Dark Up 64.4 125.4 Up 05:40:26 - 06:10:26 3503
Susanville 05:55:26 -58.4 Dark Up 65.2 125.5 Up 05:40:26 - 06:10:26 3425
Greenville 05:55:26 -58.3 Dark Up 65.2 124.5 Up 05:40:26 - 06:10:26 3402
Gimple 05:55:26 -58.3 Dark Up 65.2 124.6 Up 05:40:26 - 06:10:26 3400
Quincy 05:55:26 -58.3 Dark Up 65.3 124.2 Up 05:40:26 - 06:10:26 3381
Portola 05:55:26 -58.7 Dark Up 65.6 124.7 Up 05:40:26 - 06:10:26 3359
Reno 05:55:26 -59.3 Dark Up 66.2 125.3 Up 05:40:26 - 06:10:26 3321
Carson City 05:55:26 -59.4 Dark Up 66.4 124.6 Up 05:40:26 - 06:10:26 3283
Gardnerville 05:55:26 -59.6 Dark Up 66.6 124.2 Up 05:40:26 - 06:10:26 3257
Yerington 05:55:26 -60.0 Dark Up 66.9 125.3 Up 05:40:26 - 06:10:26 3253
Niwot 05:54:39 -68.3 Dark Up 72.7 159.1 Up 05:39:39 - 06:09:39 3214
SwRI 05:54:40 -68.3 Dark Up 72.8 158.7 Up 05:39:40 - 06:09:40 3204
Hawthorne 05:55:25 -60.5 Dark Up 67.5 125.3 Up 05:40:25 - 06:10:25 3196
Lee Vining 05:55:26 -60.4 Dark Up 67.5 123.3 Up 05:40:26 - 06:10:26 3145
Tonopah 05:55:21 -61.7 Dark Up 68.7 126.8 Up 05:40:21 - 06:10:21 3126
Bishop 05:55:26 -61.1 Dark Up 68.4 123.3 Up 05:40:26 - 06:10:26 3071
Beatty 05:55:21 -62.5 Dark Up 69.7 125.2 Up 05:40:21 - 06:10:21 2998
Lone Pine 05:55:26 -61.6 Dark Up 69.0 122.3 Up 05:40:26 - 06:10:26 2985
Indian Springs 05:55:17 -63.4 Dark Up 70.6 126.5 Up 05:40:17 - 06:10:17 2948
CPSLO 05:55:26 -60.0 Dark Up 67.8 115.3 Up 05:40:26 - 06:10:26 2899
Henderson 05:55:16 -64.1 Dark Up 71.3 126.6 Up 05:40:16 - 06:10:16 2882
Searchlight/Boulder City 05:55:16 -64.4 Dark Up 71.7 125.4 Up 05:40:16 - 06:10:16 2820
Patrick 05:55:12 -65.2 Dark Up 72.4 127.4 Up 05:40:12 - 06:10:12 2800
Laughlin/Bullhead City 05:55:15 -64.8 Dark Up 72.1 125.3 Up 05:40:15 - 06:10:15 2783
Kingman/Dolan Springs 05:55:13 -65.1 Dark Up 72.4 126.4 Up 05:40:13 - 06:10:13 2779
DCO 05:55:10 -65.8 Dark Up 73.1 128.1 Up 05:40:10 - 06:10:10 2758
Mohave Valley 05:55:15 -64.9 Dark Up 72.3 124.6 Up 05:40:15 - 06:10:15 2754
Wildwood 05:55:26 -62.0 Dark Up 69.8 115.5 Up 05:40:26 - 06:10:26 2728
Lake Havasu City 05:55:14 -65.2 Dark Up 72.7 124.1 Up 05:40:14 - 06:10:14 2708
Parker 05:55:15 -65.3 Dark Up 72.9 123.2 Up 05:40:15 - 06:10:15 2669
Idyllwild 05:55:24 -63.6 Dark Up 71.4 117.7 Up 05:40:24 - 06:10:24 2659
Blythe 05:55:16 -65.3 Dark Up 73.0 121.2 Up 05:40:16 - 06:10:16 2617
George/Scottsdale 05:55:07 -67.3 Dark Up 74.8 127.3 Up 05:40:07 - 06:10:07 2593
Calipatria 05:55:20 -64.7 Dark Up 72.5 118.1 Up 05:40:20 - 06:10:20 2577
Yuma 05:55:17 -65.5 Dark Up 73.4 118.4 Up 05:40:17 - 06:10:17 2518

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, (2026/12/25 05:54UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 15.76  41
Alnath         05:26:17.5 +28:36:23  1.6  5.27  28
PPM 094690     05:41:54.8 +23:19:34  6.5  1.51  25
PPM 094515     05:35:03.6 +24:17:26  8.0  0.54  26
PPM 094523     05:35:19.9 +23:30:46  9.4  0.26  26
04VK78         05:35:36.5 +23:45:53 11.0        26
Positions are for J2000

Event circumstances last updated at 2019/09/02 20:57:21 UT

Marc W. Buie, Southwest Research Institute

RECON