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 08:51:00 UTC

J2000 position of star is 05:40:33.5 +23:47:50
Equinox of date position of star is 05:41:45.2 +23:48:22
Stellar brightness G=14.5, use SENSEUP=128
Star is 7 degrees from the moon. Moon is 86% illuminated.
TNO apparent brightness V=23.9

[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 2955 seconds.
The 1-sigma cross-track error in the shadow position is 5757 km.
The sky-plane scale is 26571.6 km/arcsec.

The TNO has an absolute magnitude Hv=8.1
Diameter=143.2 km assuming a 5% albedo -- 9.9 sec chord
Diameter=58.5 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 04VK78, (2026/10/29 08:51UT)
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 0.3 sigma about the mid-time.
The median site spacing is 23.2 km RECON observability=1.0 and success probability=8.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:53:37 -50.7 Dark Up 53.2 122.8 Up 08:38:37 - 09:08:37 -232
Summerland 08:53:39 -51.1 Dark Up 53.2 122.1 Up 08:38:39 - 09:08:39 -255
Penticton 08:53:39 -51.1 Dark Up 53.3 122.2 Up 08:38:39 - 09:08:39 -263
Okanagan Falls 08:53:39 -51.3 Dark Up 53.4 121.9 Up 08:38:39 - 09:08:39 -281
Oliver 08:53:40 -51.4 Dark Up 53.5 121.8 Up 08:38:40 - 09:08:40 -296
Anarchist Mountain Observatory 08:53:40 -51.5 Dark Up 53.7 121.8 Up 08:38:40 - 09:08:40 -316
Oroville 08:53:40 -51.6 Dark Up 53.7 121.6 Up 08:38:40 - 09:08:40 -322
Tonasket 08:53:41 -51.8 Dark Up 53.8 121.4 Up 08:38:41 - 09:08:41 -344
Okanogan 08:53:43 -52.1 Dark Up 53.9 120.8 Up 08:38:43 - 09:08:43 -373
Brewster 08:53:44 -52.4 Dark Up 53.9 120.2 Up 08:38:44 - 09:08:44 -396
Manson/Chelan 08:53:46 -52.7 Dark Up 53.8 119.5 Up 08:38:46 - 09:08:46 -409
Wenatchee 08:53:49 -53.2 Dark Up 54.0 118.8 Up 08:38:49 - 09:08:49 -452
Ellensburg 08:53:51 -53.6 Dark Up 54.0 118.0 Up 08:38:51 - 09:08:51 -487
Yakima 08:53:53 -54.0 Dark Up 54.2 117.5 Up 08:38:53 - 09:08:53 -526
Toppenish/White Swan 08:53:52 -54.1 Dark Up 54.4 117.5 Up 08:38:52 - 09:08:52 -550
Pasco 08:53:47 -53.8 Dark Up 55.2 118.8 Up 08:38:47 - 09:08:47 -585
Goldendale 08:53:56 -54.7 Dark Up 54.4 116.3 Up 08:38:56 - 09:08:56 -596
The Dalles 08:53:58 -55.0 Dark Up 54.3 115.6 Up 08:38:58 - 09:08:58 -611
PNWRO 08:53:47 -53.9 Dark Up 55.5 118.8 Up 08:38:47 - 09:08:47 -613
Maupin 08:53:59 -55.4 Dark Up 54.5 115.2 Up 08:38:59 - 09:08:59 -654
Madras/Culver 08:54:01 -55.9 Dark Up 54.7 114.5 Up 08:39:01 - 09:09:01 -706
Sisters 08:54:04 -56.3 Dark Up 54.6 113.5 Up 08:39:04 - 09:09:04 -730
Redmond 08:54:02 -56.2 Dark Up 54.9 113.9 Up 08:39:02 - 09:09:02 -740
Bend 08:54:03 -56.4 Dark Up 54.9 113.5 Up 08:39:03 - 09:09:03 -759
Oregon Observatory 08:54:05 -56.6 Dark Up 54.8 113.2 Up 08:39:05 - 09:09:05 -773
La Pine/Gilchrist 08:54:06 -56.8 Dark Up 54.9 112.8 Up 08:39:06 - 09:09:06 -792
North Lake 08:54:04 -57.0 Dark Up 55.4 112.9 Up 08:39:04 - 09:09:04 -847
Chiloquin 08:54:11 -57.9 Dark Up 55.1 111.0 Up 08:39:11 - 09:09:11 -895
Paisley 08:54:04 -57.3 Dark Up 55.9 112.6 Up 08:39:04 - 09:09:04 -908
Klamath Falls 08:54:11 -58.2 Dark Up 55.2 110.6 Up 08:39:11 - 09:09:11 -931
Lakeview 08:54:05 -57.7 Dark Up 56.2 112.1 Up 08:39:05 - 09:09:05 -963
Tulelake 08:54:11 -58.3 Dark Up 55.6 110.6 Up 08:39:11 - 09:09:11 -963
Cedarville 08:54:06 -58.1 Dark Up 56.6 111.3 Up 08:39:06 - 09:09:06 -1032
Fall River/Burney 08:54:13 -59.0 Dark Up 55.9 109.4 Up 08:39:13 - 09:09:13 -1056
Susanville 08:54:12 -59.3 Dark Up 56.7 109.3 Up 08:39:12 - 09:09:12 -1134
Greenville 08:54:14 -59.6 Dark Up 56.5 108.6 Up 08:39:14 - 09:09:14 -1156
Gimple 08:54:13 -59.6 Dark Up 56.6 108.7 Up 08:39:13 - 09:09:13 -1158
Quincy 08:54:14 -59.8 Dark Up 56.6 108.3 Up 08:39:14 - 09:09:14 -1177
Portola 08:54:12 -59.7 Dark Up 57.0 108.6 Up 08:39:12 - 09:09:12 -1199
Reno 08:54:10 -59.6 Dark Up 57.5 108.9 Up 08:39:10 - 09:09:10 -1239
Carson City 08:54:11 -59.9 Dark Up 57.7 108.3 Up 08:39:11 - 09:09:11 -1276
Gardnerville 08:54:11 -60.1 Dark Up 57.8 108.0 Up 08:39:11 - 09:09:11 -1302
Yerington 08:54:08 -59.8 Dark Up 58.2 108.7 Up 08:39:08 - 09:09:08 -1309
Hawthorne 08:54:07 -59.9 Dark Up 58.7 108.5 Up 08:39:07 - 09:09:07 -1367
Lee Vining 08:54:11 -60.5 Dark Up 58.6 107.2 Up 08:39:11 - 09:09:11 -1415
SwRI 08:52:54 -51.4 Dark Up 67.0 128.8 Up 08:37:54 - 09:07:54 -1426
Tonopah 08:54:01 -59.5 Dark Up 59.9 109.2 Up 08:39:01 - 09:09:01 -1442
Bishop 08:54:09 -60.6 Dark Up 59.3 106.9 Up 08:39:09 - 09:09:09 -1491
Beatty 08:54:01 -60.1 Dark Up 60.6 107.8 Up 08:39:01 - 09:09:01 -1571
Lone Pine 08:54:09 -61.0 Dark Up 59.7 106.0 Up 08:39:09 - 09:09:09 -1577
Indian Springs 08:53:56 -59.7 Dark Up 61.5 108.3 Up 08:38:56 - 09:08:56 -1625
CPSLO 08:54:25 -63.3 Dark Up 58.1 101.6 Up 08:39:25 - 09:09:25 -1658
Henderson 08:53:54 -59.7 Dark Up 62.2 108.1 Up 08:38:54 - 09:08:54 -1694
Searchlight/Boulder City 08:53:55 -60.1 Dark Up 62.5 107.1 Up 08:38:55 - 09:08:55 -1755
Patrick 08:53:49 -59.4 Dark Up 63.3 108.1 Up 08:38:49 - 09:08:49 -1780
Laughlin/Bullhead City 08:53:54 -60.0 Dark Up 62.8 106.9 Up 08:38:54 - 09:08:54 -1793
Kingman/Dolan Springs 08:53:51 -59.7 Dark Up 63.2 107.5 Up 08:38:51 - 09:08:51 -1800
Mohave Valley 08:53:54 -60.2 Dark Up 62.9 106.4 Up 08:38:54 - 09:08:54 -1822
Wildwood 08:54:17 -63.1 Dark Up 59.9 101.4 Up 08:39:17 - 09:09:17 -1828
Lake Havasu City 08:53:54 -60.3 Dark Up 63.2 105.9 Up 08:38:54 - 09:08:54 -1869
Idyllwild 08:54:08 -62.3 Dark Up 61.5 102.3 Up 08:39:08 - 09:09:08 -1904
Parker 08:53:54 -60.5 Dark Up 63.3 105.3 Up 08:38:54 - 09:08:54 -1906
Blythe 08:53:57 -61.0 Dark Up 63.2 104.0 Up 08:38:57 - 09:08:57 -1957
Calipatria 08:54:03 -61.9 Dark Up 62.6 102.2 Up 08:39:03 - 09:09:03 -1991
George/Scottsdale 08:53:42 -59.2 Dark Up 65.3 106.9 Up 08:38:42 - 09:08:42 -1995
Yuma 08:53:59 -61.6 Dark Up 63.4 102.2 Up 08:38:59 - 09:08:59 -2054

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 08:51UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 16.76  23
Alnath         05:26:17.5 +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 2019/08/06 22:59:39 UT

Marc W. Buie, Southwest Research Institute

RECON