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 06:50:29 UTC

J2000 position of star is 04:30:24.8 +25:13:27
Equinox of date position of star is 04:31:48.9 +25:16:21
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.
Apparent brightness V=22.3

[RECON map]
Object is 42.9 AU from the Sun and 41.9 AU from the Earth.
Apparent velocity is 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 175 seconds.
The 1-sigma cross-track error in the shadow position is 2688 km.
The sky-plane scale is 30417.7 km/arcsec.

The object has an absolute magnitude Hv=6.0
Diameter=378.5 km assuming a 5% albedo -- 15.7 sec chord
Diameter=154.5 km assuming a 30% albedo -- 6.4 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 5.2 sigma about the mid-time.
The median site spacing is 35.6 km RECON observability=1.0 and success probability=0.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:49:32 -61.2 Dark Up 60.6 210.0 Up 06:34:32 - 07:04:32 11463
Kamloops 06:50:13 -59.7 Dark Up 64.5 183.1 Up 06:35:13 - 07:05:13 11380
Kelowna 06:50:11 -60.7 Dark Up 65.3 185.2 Up 06:35:11 - 07:05:11 11292
Peachland 06:50:12 -60.7 Dark Up 65.4 184.5 Up 06:35:12 - 07:05:12 11283
Summerland 06:50:11 -60.9 Dark Up 65.6 184.8 Up 06:35:11 - 07:05:11 11267
Penticton 06:50:11 -61.0 Dark Up 65.6 185.0 Up 06:35:11 - 07:05:11 11260
Oliver 06:50:11 -61.3 Dark Up 66.0 185.1 Up 06:35:11 - 07:05:11 11224
Anarchist Mountain Observatory 06:50:10 -61.5 Dark Up 66.1 185.6 Up 06:35:10 - 07:05:10 11205
Victoria 06:50:23 -60.3 Dark Up 66.7 176.5 Up 06:35:23 - 07:05:23 11191
Okanogan 06:50:12 -61.9 Dark Up 66.8 185.2 Up 06:35:12 - 07:05:12 11141
Brewster 06:50:12 -62.1 Dark Up 67.1 184.8 Up 06:35:12 - 07:05:12 11115
Manson/Chelan 06:50:13 -62.1 Dark Up 67.3 184.0 Up 06:35:13 - 07:05:13 11097
Wenatchee 06:50:14 -62.4 Dark Up 67.8 183.7 Up 06:35:14 - 07:05:14 11050
Ellensburg 06:50:16 -62.7 Dark Up 68.2 183.2 Up 06:35:16 - 07:05:16 11009
Yakima 06:50:16 -63.0 Dark Up 68.6 183.2 Up 06:35:16 - 07:05:16 10968
Toppenish/White Swan 06:50:15 -63.3 Dark Up 68.8 183.7 Up 06:35:15 - 07:05:15 10944
PNWRO 06:50:10 -64.2 Dark Up 69.1 187.5 Up 06:35:10 - 07:05:10 10893
The Dalles 06:50:17 -63.5 Dark Up 69.6 181.8 Up 06:35:17 - 07:05:17 10870
Maupin 06:50:18 -63.9 Dark Up 70.0 182.1 Up 06:35:18 - 07:05:18 10826
Sisters 06:50:20 -64.4 Dark Up 70.9 180.9 Up 06:35:20 - 07:05:20 10739
Bend 06:50:19 -64.7 Dark Up 71.2 181.6 Up 06:35:19 - 07:05:19 10712
Oregon Observatory 06:50:19 -64.7 Dark Up 71.3 181.2 Up 06:35:19 - 07:05:19 10695
Chiloquin 06:50:22 -65.5 Dark Up 72.7 180.1 Up 06:35:22 - 07:05:22 10561
Klamath Falls 06:50:20 -65.8 Dark Up 73.0 180.3 Up 06:35:20 - 07:05:20 10524
Cedarville 06:50:17 -67.1 Dark Up 73.6 185.5 Up 06:35:17 - 07:05:17 10435
Fall River/Burney 06:50:21 -66.8 Dark Up 74.2 181.6 Up 06:35:21 - 07:05:21 10395
Greenville 06:50:20 -67.7 Dark Up 75.1 183.3 Up 06:35:20 - 07:05:20 10295
Gimple 06:50:20 -67.7 Dark Up 75.1 183.6 Up 06:35:20 - 07:05:20 10294
Quincy 06:50:20 -67.8 Dark Up 75.3 183.3 Up 06:35:20 - 07:05:20 10273
Portola 06:50:18 -68.2 Dark Up 75.4 185.0 Up 06:35:18 - 07:05:18 10255
Dunrhomin 06:49:26 -73.1 Dark Up 69.6 227.5 Up 06:34:26 - 07:04:26 10230
Reno 06:50:16 -68.7 Dark Up 75.6 187.5 Up 06:35:16 - 07:05:16 10220
Nikitin 06:49:26 -73.2 Dark Up 69.8 227.8 Up 06:34:26 - 07:04:26 10210
CU-SBO 06:49:26 -73.3 Dark Up 69.8 227.8 Up 06:34:26 - 07:04:26 10203
Carson City 06:50:16 -69.0 Dark Up 75.9 187.7 Up 06:35:16 - 07:05:16 10182
Gardnerville 06:50:16 -69.2 Dark Up 76.2 188.0 Up 06:35:16 - 07:05:16 10155
Yerington 06:50:14 -69.5 Dark Up 76.0 190.2 Up 06:35:14 - 07:05:14 10155
Hawthorne 06:50:12 -70.1 Dark Up 76.4 192.5 Up 06:35:12 - 07:05:12 10100
Lee Vining 06:50:15 -70.2 Dark Up 77.1 191.1 Up 06:35:15 - 07:05:15 10044
Bishop 06:50:12 -71.0 Dark Up 77.5 194.6 Up 06:35:12 - 07:05:12 9973
Beatty 06:50:06 -72.3 Dark Up 77.5 201.7 Up 06:35:06 - 07:05:06 9910
Patrick 06:49:56 -74.9 Dark Up 77.7 215.9 Up 06:34:56 - 07:04:56 9728
Laughlin/Bullhead City 06:49:58 -74.7 Dark Up 78.3 214.0 Up 06:34:58 - 07:04:58 9706
Lake Havasu City 06:49:58 -75.4 Dark Up 78.7 216.9 Up 06:34:58 - 07:04:58 9630
Wildwood 06:50:14 -73.0 Dark Up 80.7 198.5 Up 06:35:14 - 07:05:14 9619
Idyllwild 06:50:08 -74.4 Dark Up 80.4 209.0 Up 06:35:08 - 07:05:08 9564
George/Scottsdale 06:49:49 -77.3 Dark Up 77.9 228.0 Up 06:34:49 - 07:04:49 9532
Calipatria 06:50:03 -75.6 Dark Up 80.4 216.4 Up 06:35:03 - 07:05:03 9488
Yuma 06:50:00 -76.4 Dark Up 80.3 221.8 Up 06:35:00 - 07:05:00 9435

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 2022/12/25 04:00:56 UT

Marc W. Buie, Southwest Research Institute

RECON