RECON: TNO occultation with 04VK78

Event between 04VK78 and star GA1120:01237885 with event index number of 1453278

Geocentric closest approach at 2025/11/22 09:34:24 UTC

J2000 position of star is 05:31:09.6 +23:40:13
Equinox of date position of star is 05:32:20.7 +23:41:01
Stellar brightness G=15.6, use SENSEUP=128
Star is 175 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=23.8

[RECON map]
TNO is 37.0 AU from the Sun and 36.1 AU from the Earth.
The TNO is moving 22.6 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 1558 seconds.
The 1-sigma cross-track error in the shadow position is 4256 km.
The sky-plane scale is 26189.0 km/arcsec.

The TNO has an absolute magnitude Hv=8.1
Diameter=143.2 km assuming a 5% albedo -- 6.3 sec chord
Diameter=58.5 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 04VK78, (2025/11/22 09:34UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.5 +16:33:34  0.8 14.80 163
Alnath         05:27:55.8 +28:37:37  1.6  5.06 179
114 Tau        05:29:11.5 +21:57:25  4.7  1.91 174
PPM 094385     05:29:29.7 +23:18:45  8.4  0.83 175
PPM 094416     05:31:37.9 +23:46:37  9.1  0.27 176
04VK78         05:32:44.3 +23:41:16 15.6       175
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 22.3 km RECON observability=1.0 and success probability=10.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 09:34:11 -53.1 Dark Down 63.7 186.2 Up 09:19:11 - 09:49:11 4457
Summerland 09:34:12 -53.5 Dark Down 64.0 185.7 Up 09:19:12 - 09:49:12 4428
Penticton 09:34:11 -53.5 Dark Down 64.0 185.9 Up 09:19:11 - 09:49:11 4421
Okanagan Falls 09:34:12 -53.6 Dark Down 64.2 185.9 Up 09:19:12 - 09:49:12 4402
Oliver 09:34:11 -53.7 Dark Down 64.4 186.0 Up 09:19:11 - 09:49:11 4386
Anarchist Mountain Observatory 09:34:11 -53.7 Dark Down 64.5 186.4 Up 09:19:11 - 09:49:11 4368
Oroville 09:34:11 -53.8 Dark Down 64.6 186.3 Up 09:19:11 - 09:49:11 4361
Tonasket 09:34:11 -54.0 Dark Down 64.9 186.4 Up 09:19:11 - 09:49:11 4337
Okanogan 09:34:12 -54.3 Dark Down 65.2 186.1 Up 09:19:12 - 09:49:12 4303
Brewster 09:34:12 -54.5 Dark Down 65.5 185.7 Up 09:19:12 - 09:49:12 4276
Manson/Chelan 09:34:13 -54.9 Dark Down 65.7 185.0 Up 09:19:13 - 09:49:13 4256
Entiat 09:34:14 -55.0 Dark Down 65.9 184.9 Up 09:19:14 - 09:49:14 4234
Wenatchee 09:34:14 -55.3 Dark Down 66.2 184.7 Up 09:19:14 - 09:49:14 4208
Ellensburg 09:34:15 -55.7 Dark Down 66.6 184.3 Up 09:19:15 - 09:49:15 4166
Yakima 09:34:15 -55.9 Dark Down 67.0 184.3 Up 09:19:15 - 09:49:15 4125
Toppenish/White Swan 09:34:14 -56.0 Dark Down 67.2 184.7 Up 09:19:14 - 09:49:14 4102
Pasco 09:34:10 -55.4 Dark Down 67.3 187.7 Up 09:19:10 - 09:49:10 4087
PNWRO 09:34:09 -55.4 Dark Down 67.5 188.4 Up 09:19:09 - 09:49:09 4062
George/Umatilla 09:34:11 -55.7 Dark Down 67.6 187.3 Up 09:19:11 - 09:49:11 4053
Goldendale 09:34:16 -56.6 Dark Down 67.8 183.8 Up 09:19:16 - 09:49:16 4046
The Dalles 09:34:17 -56.9 Dark Down 68.1 183.0 Up 09:19:17 - 09:49:17 4024
Maupin 09:34:17 -57.1 Dark Down 68.5 183.3 Up 09:19:17 - 09:49:17 3980
Madras/Culver 09:34:17 -57.5 Dark Down 69.0 183.3 Up 09:19:17 - 09:49:17 3924
Sisters 09:34:19 -58.0 Dark Down 69.4 182.2 Up 09:19:19 - 09:49:19 3890
Redmond 09:34:17 -57.8 Dark Down 69.4 183.2 Up 09:19:17 - 09:49:17 3887
Bend 09:34:18 -58.0 Dark Down 69.6 182.9 Up 09:19:18 - 09:49:18 3865
Oregon Observatory 09:34:18 -58.2 Dark Down 69.8 182.6 Up 09:19:18 - 09:49:18 3847
La Pine/Gilchrist 09:34:18 -58.3 Dark Down 70.0 182.4 Up 09:19:18 - 09:49:18 3826
North Lake 09:34:16 -58.3 Dark Down 70.4 184.1 Up 09:19:16 - 09:49:16 3779
Paisley 09:34:15 -58.4 Dark Down 70.9 185.2 Up 09:19:15 - 09:49:15 3720
Chiloquin 09:34:20 -59.2 Dark Down 71.1 181.6 Up 09:19:20 - 09:49:20 3711
Klamath Falls 09:34:19 -59.4 Dark Down 71.4 181.8 Up 09:19:19 - 09:49:19 3674
Lakeview 09:34:14 -58.6 Dark Down 71.4 185.9 Up 09:19:14 - 09:49:14 3667
Tulelake 09:34:19 -59.4 Dark Down 71.7 182.7 Up 09:19:19 - 09:49:19 3645
Cedarville 09:34:14 -58.9 Dark Down 72.0 186.6 Up 09:19:14 - 09:49:14 3597
Fall River/Burney 09:34:18 -59.9 Dark Down 72.6 183.1 Up 09:19:18 - 09:49:18 3549
Niwot 09:33:19 -49.4 Dark Down 68.2 226.2 Up 09:18:19 - 09:48:19 3480
Susanville 09:34:15 -59.8 Dark Down 73.2 185.5 Up 09:19:15 - 09:49:15 3480
SwRI 09:33:19 -49.5 Dark Down 68.3 226.2 Up 09:18:19 - 09:48:19 3468
Greenville 09:34:17 -60.1 Dark Down 73.5 184.7 Up 09:19:17 - 09:49:17 3451
Gimple 09:34:16 -60.1 Dark Down 73.5 185.0 Up 09:19:16 - 09:49:16 3451
Quincy 09:34:17 -60.2 Dark Down 73.7 184.8 Up 09:19:17 - 09:49:17 3430
Portola 09:34:15 -60.0 Dark Down 73.8 186.3 Up 09:19:15 - 09:49:15 3415
Reno 09:34:12 -59.7 Dark Down 74.0 188.6 Up 09:19:12 - 09:49:12 3385
Carson City 09:34:12 -59.9 Dark Down 74.3 188.8 Up 09:19:12 - 09:49:12 3347
Yerington 09:34:11 -59.6 Dark Down 74.4 191.1 Up 09:19:11 - 09:49:11 3325
Gardnerville 09:34:12 -60.0 Dark Down 74.6 189.1 Up 09:19:12 - 09:49:12 3321
Hawthorne 09:34:08 -59.5 Dark Down 74.8 193.2 Up 09:19:08 - 09:49:08 3274
Tonopah 09:34:03 -58.7 Dark Down 75.0 198.4 Up 09:19:03 - 09:49:03 3223
Lee Vining 09:34:10 -60.1 Dark Down 75.4 192.0 Up 09:19:10 - 09:49:10 3214
Bishop 09:34:07 -59.8 Dark Down 75.9 195.1 Up 09:19:07 - 09:49:07 3149
Beatty 09:34:01 -58.9 Dark Down 75.9 201.5 Up 09:19:01 - 09:49:01 3098
Lone Pine 09:34:06 -59.9 Dark Down 76.5 197.2 Up 09:19:06 - 09:49:06 3066
Indian Springs 09:33:57 -58.2 Dark Down 75.9 205.8 Up 09:18:57 - 09:48:57 3063
Henderson 09:33:54 -57.9 Dark Down 76.1 209.1 Up 09:18:54 - 09:48:54 3005
Searchlight/Boulder City 09:33:53 -58.1 Dark Down 76.6 210.5 Up 09:18:53 - 09:48:53 2943
Patrick 09:33:49 -57.3 Dark Down 76.2 214.2 Up 09:18:49 - 09:48:49 2939
CPSLO 09:34:16 -62.4 Dark Down 78.3 187.9 Up 09:19:16 - 09:49:16 2930
Kingman/Dolan Springs 09:33:50 -57.5 Dark Down 76.4 214.1 Up 09:18:50 - 09:48:50 2914
Laughlin/Bullhead City 09:33:52 -57.9 Dark Down 76.7 212.4 Up 09:18:52 - 09:48:52 2911
DCO 09:33:47 -56.8 Dark Down 76.1 217.2 Up 09:18:47 - 09:48:47 2907
Mohave Valley 09:33:52 -58.0 Dark Down 76.9 213.0 Up 09:18:52 - 09:48:52 2882
Lake Havasu City 09:33:51 -57.9 Dark Down 77.1 214.8 Up 09:18:51 - 09:48:51 2838
Parker 09:33:51 -58.0 Dark Down 77.4 215.8 Up 09:18:51 - 09:48:51 2800
Wildwood 09:34:08 -61.3 Dark Down 79.1 198.5 Up 09:19:08 - 09:49:08 2794
Idyllwild 09:34:01 -60.0 Dark Down 78.8 207.5 Up 09:19:01 - 09:49:01 2754
Blythe 09:33:52 -58.4 Dark Down 78.0 216.2 Up 09:18:52 - 09:48:52 2742
Calipatria 09:33:56 -59.3 Dark Down 78.8 214.0 Up 09:18:56 - 09:48:56 2687
Yuma 09:33:52 -58.7 Dark Down 78.7 218.8 Up 09:18:52 - 09:48:52 2641

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, (2025/11/22 09:34UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 14.80 163
Alnath         05:26:17.5 +28:36:23  1.6  5.06 179
114 Tau        05:27:38.1 +21:56:13  4.7  1.91 174
PPM 094385     05:27:55.4 +23:17:34  8.4  0.83 175
PPM 094416     05:30:03.2 +23:45:31  9.1  0.27 176
04VK78         05:31:09.6 +23:40:13 15.6       175
Positions are for J2000

Event circumstances last updated at 2019/06/08 13:11:01 UT

Marc W. Buie, Southwest Research Institute

RECON