RECON: TNO occultation with 612083

Event between (612083) 98WX31 and star GA1140:02956787 with event index number of 2805248

Geocentric closest approach at 2027/01/09 05:02:35 UTC

J2000 position of star is 07:23:42.0 +24:57:43
Equinox of date position of star is 07:25:06.7 +24:54:56
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 166 degrees from the moon. Moon is 2% illuminated.
Apparent brightness V=22.8

[RECON map]
Object is 41.1 AU from the Sun and 40.1 AU from the Earth.
Apparent velocity is 25.4 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 513 seconds.
The 1-sigma cross-track error in the shadow position is 3240 km.
The sky-plane scale is 29089.3 km/arcsec.

The object has an absolute magnitude Hv=6.7
Diameter=270.4 km assuming a 5% albedo -- 10.6 sec chord
Diameter=110.4 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 612083, (2027/01/09 04:55UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:58.2 +27:57:31  1.1  5.72 169
57 Gem         07:25:07.2 +24:59:46  5.9  0.10 165
PPM 097353     07:20:34.4 +25:53:23  8.2  1.46 164
57 Gem         07:25:07.2 +24:59:46  5.9  0.10 165
612083         07:25:20.7 +24:54:28 15.3       166
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 1.8 sigma about the mid-time.
The median site spacing is 34.7 km RECON observability=1.0 and success probability=16.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 05:04:50 -44.4 Dark Down 46.2 108.1 Up 04:49:50 - 05:19:50 1050
Sleaford 05:04:16 -51.5 Dark Down 53.5 125.5 Up 04:49:16 - 05:19:16 1037
Kelowna 05:04:50 -45.3 Dark Down 47.0 108.1 Up 04:49:50 - 05:19:50 958
Peachland 05:04:51 -45.1 Dark Down 46.8 107.7 Up 04:49:51 - 05:19:51 951
Summerland 05:04:51 -45.2 Dark Down 46.9 107.7 Up 04:49:51 - 05:19:51 935
Penticton 05:04:51 -45.3 Dark Down 47.0 107.7 Up 04:49:51 - 05:19:51 927
Oliver 05:04:51 -45.5 Dark Down 47.1 107.3 Up 04:49:51 - 05:19:51 893
Victoria 05:05:00 -43.3 Dark Down 44.9 103.1 Up 04:50:00 - 05:20:00 887
Anarchist Mountain Observatory 05:04:51 -45.6 Dark Down 47.3 107.4 Up 04:49:51 - 05:19:51 873
Okanogan 05:04:52 -45.7 Dark Down 47.4 106.5 Up 04:49:52 - 05:19:52 812
Brewster 05:04:54 -45.7 Dark Down 47.3 106.0 Up 04:49:54 - 05:19:54 788
Manson/Chelan 05:04:55 -45.5 Dark Down 47.1 105.5 Up 04:49:55 - 05:19:55 773
Wenatchee 05:04:56 -45.6 Dark Down 47.1 104.8 Up 04:49:56 - 05:19:56 728
Ellensburg 05:04:57 -45.6 Dark Down 47.1 104.2 Up 04:49:57 - 05:19:57 690
Yakima 05:04:58 -45.7 Dark Down 47.2 103.7 Up 04:49:58 - 05:19:58 650
Toppenish/White Swan 05:04:58 -45.9 Dark Down 47.4 103.7 Up 04:49:58 - 05:19:58 625
PNWRO 05:04:55 -47.0 Dark Down 48.4 104.6 Up 04:49:55 - 05:19:55 565
The Dalles 05:05:01 -45.6 Dark Down 47.0 102.2 Up 04:50:01 - 05:20:01 560
Maupin 05:05:01 -45.7 Dark Down 47.2 101.8 Up 04:50:01 - 05:20:01 516
Sisters 05:05:04 -45.6 Dark Down 47.0 100.5 Up 04:50:04 - 05:20:04 435
Bend 05:05:04 -45.9 Dark Down 47.2 100.4 Up 04:50:04 - 05:20:04 406
Oregon Observatory 05:05:04 -45.8 Dark Down 47.2 100.1 Up 04:50:04 - 05:20:04 391
Chiloquin 05:05:08 -45.8 Dark Down 47.1 98.4 Up 04:50:08 - 05:20:08 263
Klamath Falls 05:05:08 -46.0 Dark Down 47.2 98.1 Up 04:50:08 - 05:20:08 226
Cedarville 05:05:05 -47.3 Dark Down 48.5 98.6 Up 04:50:05 - 05:20:05 127
Fall River/Burney 05:05:09 -46.5 Dark Down 47.6 97.1 Up 04:50:09 - 05:20:09 98
Greenville 05:05:09 -47.0 Dark Down 48.1 96.5 Up 04:50:09 - 05:20:09 -4
Gimple 05:05:09 -47.1 Dark Down 48.1 96.5 Up 04:50:09 - 05:20:09 -6
Quincy 05:05:09 -47.0 Dark Down 48.1 96.3 Up 04:50:09 - 05:20:09 -25
Portola 05:05:08 -47.4 Dark Down 48.5 96.5 Up 04:50:08 - 05:20:08 -47
Reno 05:05:07 -48.0 Dark Down 49.0 96.6 Up 04:50:07 - 05:20:07 -86
Carson City 05:05:08 -48.0 Dark Down 49.1 96.3 Up 04:50:08 - 05:20:08 -124
Gardnerville 05:05:08 -48.1 Dark Down 49.1 96.0 Up 04:50:08 - 05:20:08 -150
Yerington 05:05:06 -48.6 Dark Down 49.6 96.5 Up 04:50:06 - 05:20:06 -155
Dunrhomin 05:04:27 -58.3 Dark Down 59.6 110.6 Up 04:49:27 - 05:19:27 -193
Nikitin 05:04:27 -58.4 Dark Down 59.7 110.3 Up 04:49:27 - 05:19:27 -212
Hawthorne 05:05:06 -49.0 Dark Down 50.0 96.3 Up 04:50:06 - 05:20:06 -213
CU-SBO 05:04:28 -58.3 Dark Down 59.7 110.1 Up 04:49:28 - 05:19:28 -219
Lee Vining 05:05:08 -48.8 Dark Down 49.7 95.3 Up 04:50:08 - 05:20:08 -264
Bishop 05:05:07 -49.4 Dark Down 50.3 95.1 Up 04:50:07 - 05:20:07 -340
Beatty 05:05:03 -50.8 Dark Down 51.7 95.7 Up 04:50:03 - 05:20:03 -415
Patrick 05:04:56 -53.3 Dark Down 54.1 95.7 Up 04:49:56 - 05:19:56 -618
Laughlin/Bullhead City 05:04:59 -52.8 Dark Down 53.6 94.9 Up 04:49:59 - 05:19:59 -634
Wildwood 05:05:11 -49.7 Dark Down 50.4 91.0 Up 04:50:11 - 05:20:11 -685
Lake Havasu City 05:04:59 -53.1 Dark Down 53.8 94.1 Up 04:49:59 - 05:19:59 -711
Idyllwild 05:05:06 -51.3 Dark Down 51.9 91.7 Up 04:50:06 - 05:20:06 -756
George/Scottsdale 05:04:52 -55.2 Dark Down 55.9 94.6 Up 04:49:52 - 05:19:52 -829
Calipatria 05:05:03 -52.3 Dark Down 52.9 91.6 Up 04:50:03 - 05:20:03 -841
Yuma 05:05:01 -53.1 Dark Down 53.7 91.5 Up 04:50:01 - 05:20:01 -901

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 612083, (2027/01/09 04:55UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  5.72 169
57 Gem         07:23:28.4 +25:03:01  5.9  0.10 165
PPM 097353     07:18:54.9 +25:56:28  8.2  1.46 164
57 Gem         07:23:28.4 +25:03:01  5.9  0.10 165
612083         07:23:42.0 +24:57:43 15.3       166
Positions are for J2000

Event circumstances last updated at 2023/03/04 04:14:00 UT

Marc W. Buie, Southwest Research Institute

RECON