RECON: TNO occultation with 547617

Event between (547617) 10TT195 and star GA1140:00738819 with event index number of 2251458

Geocentric closest approach at 2026/12/18 06:54:49 UTC

J2000 position of star is 04:30:24.8 +25:13:27
Equinox of date position of star is 04:31:45.5 +25:16:14
Stellar brightness G=10.8, use SENSEUP=4 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 61 degrees from the moon. Moon is 61% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 42.9 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 24.6 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 273 seconds.
The 1-sigma cross-track error in the shadow position is 3834 km.
The sky-plane scale is 30417.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.0
Diameter=380.2 km assuming a 5% albedo -- 15.4 sec chord
Diameter=155.2 km assuming a 30% albedo -- 6.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 547617, (2026/12/18 07:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.2 +16:33:41  0.8  8.81  62
3Iot Aur       04:58:45.2 +33:12:22  2.7  9.83  67
PPM 093661     04:41:02.0 +25:16:10  6.3  2.03  63
PPM 093584     04:34:00.5 +25:14:27  7.6  0.44  61
PPM 093570     04:32:54.9 +25:05:11  9.0  0.27  61
PPM 093560     04:31:46.1 +25:30:22 11.5  0.23  61
547617         04:32:03.4 +25:16:51 10.8        61
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 3.3 sigma about the mid-time.
The median site spacing is 29.4 km RECON observability=1.0 and success probability=3.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:53:51 -61.3 Dark Up 60.3 211.9 Up 06:38:51 - 07:08:51 10334
Kamloops 06:54:31 -60.1 Dark Up 64.5 185.4 Up 06:39:31 - 07:09:31 10243
Kelowna 06:54:27 -61.1 Dark Up 65.2 187.5 Up 06:39:27 - 07:09:27 10155
Peachland 06:54:29 -61.1 Dark Up 65.4 186.9 Up 06:39:29 - 07:09:29 10146
Summerland 06:54:29 -61.2 Dark Up 65.5 187.1 Up 06:39:29 - 07:09:29 10130
Penticton 06:54:29 -61.3 Dark Up 65.5 187.4 Up 06:39:29 - 07:09:29 10123
Oliver 06:54:28 -61.6 Dark Up 65.9 187.5 Up 06:39:28 - 07:09:28 10087
Anarchist Mountain Observatory 06:54:28 -61.8 Dark Up 66.1 187.9 Up 06:39:28 - 07:09:28 10068
Victoria 06:54:40 -60.8 Dark Up 66.7 179.0 Up 06:39:40 - 07:09:40 10052
Tonasket 06:54:28 -62.1 Dark Up 66.4 187.9 Up 06:39:28 - 07:09:28 10037
Okanogan 06:54:29 -62.3 Dark Up 66.7 187.7 Up 06:39:29 - 07:09:29 10004
Brewster 06:54:30 -62.5 Dark Up 67.0 187.3 Up 06:39:30 - 07:09:30 9978
Manson/Chelan 06:54:31 -62.5 Dark Up 67.2 186.5 Up 06:39:31 - 07:09:31 9959
Wenatchee 06:54:32 -62.9 Dark Up 67.7 186.2 Up 06:39:32 - 07:09:32 9912
Ellensburg 06:54:33 -63.1 Dark Up 68.1 185.8 Up 06:39:33 - 07:09:33 9871
Yakima 06:54:33 -63.4 Dark Up 68.6 185.9 Up 06:39:33 - 07:09:33 9829
Toppenish/White Swan 06:54:33 -63.7 Dark Up 68.8 186.4 Up 06:39:33 - 07:09:33 9806
PNWRO 06:54:27 -64.6 Dark Up 69.0 190.2 Up 06:39:27 - 07:09:27 9756
Goldendale 06:54:34 -64.0 Dark Up 69.3 185.4 Up 06:39:34 - 07:09:34 9752
The Dalles 06:54:34 -64.0 Dark Up 69.6 184.6 Up 06:39:34 - 07:09:34 9732
Maupin 06:54:35 -64.4 Dark Up 70.0 184.9 Up 06:39:35 - 07:09:35 9687
Sisters 06:54:36 -64.9 Dark Up 70.9 183.8 Up 06:39:36 - 07:09:36 9600
Bend 06:54:35 -65.2 Dark Up 71.1 184.6 Up 06:39:35 - 07:09:35 9573
Oregon Observatory 06:54:37 -65.2 Dark Up 71.3 184.3 Up 06:39:37 - 07:09:37 9556
North Lake 06:54:34 -66.0 Dark Up 71.9 186.0 Up 06:39:34 - 07:09:34 9484
Chiloquin 06:54:39 -66.0 Dark Up 72.6 183.3 Up 06:39:39 - 07:09:39 9421
Klamath Falls 06:54:39 -66.3 Dark Up 73.0 183.7 Up 06:39:39 - 07:09:39 9384
Lakeview 06:54:34 -67.1 Dark Up 72.9 188.0 Up 06:39:34 - 07:09:34 9368
Cedarville 06:54:33 -67.6 Dark Up 73.5 188.9 Up 06:39:33 - 07:09:33 9296
Fall River/Burney 06:54:38 -67.4 Dark Up 74.1 185.2 Up 06:39:38 - 07:09:38 9256
Susanville 06:54:36 -68.2 Dark Up 74.7 187.9 Up 06:39:36 - 07:09:36 9182
Greenville 06:54:37 -68.3 Dark Up 75.0 187.0 Up 06:39:37 - 07:09:37 9155
Gimple 06:54:37 -68.3 Dark Up 75.0 187.3 Up 06:39:37 - 07:09:37 9154
Quincy 06:54:37 -68.4 Dark Up 75.2 187.1 Up 06:39:37 - 07:09:37 9133
Portola 06:54:35 -68.8 Dark Up 75.3 188.9 Up 06:39:35 - 07:09:35 9116
Dunrhomin 06:53:43 -73.1 Dark Up 69.0 229.6 Up 06:38:43 - 07:08:43 9101
Reno 06:54:33 -69.3 Dark Up 75.4 191.3 Up 06:39:33 - 07:09:33 9082
Carson City 06:54:32 -69.6 Dark Up 75.8 191.7 Up 06:39:32 - 07:09:32 9043
Yerington 06:54:30 -70.0 Dark Up 75.9 194.1 Up 06:39:30 - 07:09:30 9017
Gardnerville 06:54:33 -69.8 Dark Up 76.0 192.0 Up 06:39:33 - 07:09:33 9016
Hawthorne 06:54:29 -70.7 Dark Up 76.2 196.5 Up 06:39:29 - 07:09:29 8962
Lee Vining 06:54:31 -70.8 Dark Up 76.9 195.3 Up 06:39:31 - 07:09:31 8905
Tonopah 06:54:24 -71.7 Dark Up 76.3 202.2 Up 06:39:24 - 07:09:24 8901
Bishop 06:54:30 -71.6 Dark Up 77.3 198.9 Up 06:39:30 - 07:09:30 8835
Beatty 06:54:23 -72.8 Dark Up 77.2 205.9 Up 06:39:23 - 07:09:23 8773
Indian Springs 06:54:19 -73.6 Dark Up 77.1 210.5 Up 06:39:19 - 07:09:19 8730
Henderson 06:54:17 -74.4 Dark Up 77.2 214.2 Up 06:39:17 - 07:09:17 8668
Patrick 06:54:13 -75.5 Dark Up 77.2 219.7 Up 06:39:13 - 07:09:13 8593
Laughlin/Bullhead City 06:54:15 -75.3 Dark Up 77.8 218.0 Up 06:39:15 - 07:09:15 8570
Kingman/Dolan Springs 06:54:14 -75.5 Dark Up 77.5 219.7 Up 06:39:14 - 07:09:14 8570
Mohave Valley 06:54:16 -75.5 Dark Up 78.0 218.8 Up 06:39:16 - 07:09:16 8540
Lake Havasu City 06:54:15 -75.9 Dark Up 78.1 220.9 Up 06:39:15 - 07:09:15 8495
Wildwood 06:54:30 -73.7 Dark Up 80.4 204.1 Up 06:39:30 - 07:09:30 8481
Parker 06:54:15 -76.2 Dark Up 78.4 222.1 Up 06:39:15 - 07:09:15 8456
Idyllwild 06:54:23 -75.1 Dark Up 79.9 213.9 Up 06:39:23 - 07:09:23 8427
George/Scottsdale 06:54:06 -77.8 Dark Up 77.2 231.2 Up 06:39:06 - 07:09:06 8398
Calipatria 06:54:19 -76.2 Dark Up 79.8 221.0 Up 06:39:19 - 07:09:19 8352
Yuma 06:54:16 -77.1 Dark Up 79.6 226.1 Up 06:39:16 - 07:09:16 8299

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 547617, (2026/12/18 07:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  8.81  62
3Iot Aur       04:56:59.6 +33:09:58  2.7  9.83  67
PPM 093661     04:39:23.2 +25:13:05  6.3  2.03  63
PPM 093584     04:32:21.8 +25:11:07  7.6  0.44  61
PPM 093570     04:31:16.4 +25:01:48  9.0  0.27  61
PPM 093560     04:30:07.3 +25:26:57 11.5  0.23  61
547617         04:30:24.8 +25:13:27 10.8        61
Positions are for J2000

Event circumstances last updated at 2022/01/19 23:49:40 UT

Marc W. Buie, Southwest Research Institute

RECON