RECON: TNO occultation with 98WX31

Event between 98WX31 and star GA1140:02817886 with event index number of 1657766

Geocentric closest approach at 2027/01/09 04:55:01 UTC

J2000 position of star is 07:23:42.0 +24:57:43
Equinox of date position of star is 07:24:54.2 +24:55:21
Stellar brightness G=15.3, use SENSEUP=128
Star is 166 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 41.1 AU from the Sun and 40.1 AU from the Earth.
The TNO is moving 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 900 seconds.
The 1-sigma cross-track error in the shadow position is 4817 km.
The sky-plane scale is 29089.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.7
Diameter=272.9 km assuming a 5% albedo -- 10.7 sec chord
Diameter=111.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WX31, (2027/01/09 04:55UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:58.3 +27:57:31  1.1  5.72 169
57 Gem         07:25:07.2 +24:59:46  5.9  0.10 165
PPM 097353     07:20:34.5 +25:53:24  8.2  1.46 164
57 Gem         07:25:07.2 +24:59:46  5.9  0.10 165
98WX31         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 1.0 sigma about the mid-time.
The median site spacing is 24.5 km RECON observability=1.0 and success probability=10.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 04:57:19 -44.1 Dark Down 45.8 106.8 Up 04:42:19 - 05:12:19 2221
Kelowna 04:57:20 -44.1 Dark Down 45.8 106.3 Up 04:42:20 - 05:12:20 2186
Summerland 04:57:20 -44.1 Dark Down 45.8 105.9 Up 04:42:20 - 05:12:20 2164
Penticton 04:57:21 -44.2 Dark Down 45.9 105.9 Up 04:42:21 - 05:12:21 2155
Oliver 04:57:21 -44.3 Dark Down 45.9 105.6 Up 04:42:21 - 05:12:21 2121
Victoria 04:57:30 -42.1 Dark Down 43.7 101.5 Up 04:42:30 - 05:12:30 2119
Anarchist Mountain Observatory 04:57:21 -44.5 Dark Down 46.1 105.6 Up 04:42:21 - 05:12:21 2101
Tonasket 04:57:21 -44.5 Dark Down 46.2 105.2 Up 04:42:21 - 05:12:21 2072
Okanogan 04:57:23 -44.6 Dark Down 46.1 104.7 Up 04:42:23 - 05:12:23 2041
Brewster 04:57:23 -44.5 Dark Down 46.1 104.3 Up 04:42:23 - 05:12:23 2017
Manson/Chelan 04:57:25 -44.3 Dark Down 45.9 103.7 Up 04:42:25 - 05:12:25 2002
Entiat 04:57:25 -44.4 Dark Down 45.9 103.4 Up 04:42:25 - 05:12:25 1982
Wenatchee 04:57:26 -44.4 Dark Down 45.9 103.1 Up 04:42:26 - 05:12:26 1958
Ellensburg 04:57:27 -44.3 Dark Down 45.9 102.5 Up 04:42:27 - 05:12:27 1921
Yakima 04:57:28 -44.5 Dark Down 45.9 102.1 Up 04:42:28 - 05:12:28 1880
Toppenish/White Swan 04:57:28 -44.6 Dark Down 46.1 102.0 Up 04:42:28 - 05:12:28 1856
Pasco 04:57:25 -45.5 Dark Down 47.0 103.0 Up 04:42:25 - 05:12:25 1823
Goldendale 04:57:30 -44.5 Dark Down 45.9 101.1 Up 04:42:30 - 05:12:30 1808
PNWRO 04:57:25 -45.7 Dark Down 47.2 102.9 Up 04:42:25 - 05:12:25 1795
The Dalles 04:57:31 -44.3 Dark Down 45.7 100.5 Up 04:42:31 - 05:12:31 1791
Maupin 04:57:32 -44.5 Dark Down 45.9 100.2 Up 04:42:32 - 05:12:32 1747
Sisters 04:57:34 -44.3 Dark Down 45.7 98.9 Up 04:42:34 - 05:12:34 1667
Redmond 04:57:33 -44.6 Dark Down 46.0 99.2 Up 04:42:33 - 05:12:33 1658
Bend 04:57:34 -44.6 Dark Down 45.9 98.9 Up 04:42:34 - 05:12:34 1639
Oregon Observatory 04:57:35 -44.5 Dark Down 45.8 98.6 Up 04:42:35 - 05:12:35 1624
La Pine/Gilchrist 04:57:35 -44.5 Dark Down 45.8 98.3 Up 04:42:35 - 05:12:35 1604
North Lake 04:57:35 -45.0 Dark Down 46.3 98.4 Up 04:42:35 - 05:12:35 1549
Paisley 04:57:34 -45.4 Dark Down 46.6 98.1 Up 04:42:34 - 05:12:34 1486
Klamath Falls 04:57:38 -44.6 Dark Down 45.8 96.7 Up 04:42:38 - 05:12:38 1461
Lakeview 04:57:35 -45.7 Dark Down 46.9 97.7 Up 04:42:35 - 05:12:35 1431
Cedarville 04:57:35 -45.9 Dark Down 47.1 97.2 Up 04:42:35 - 05:12:35 1360
Fall River/Burney 04:57:39 -45.1 Dark Down 46.2 95.7 Up 04:42:39 - 05:12:39 1332
Susanville 04:57:39 -45.8 Dark Down 46.8 95.6 Up 04:42:39 - 05:12:39 1253
Greenville 04:57:39 -45.6 Dark Down 46.7 95.1 Up 04:42:39 - 05:12:39 1230
Gimple 04:57:39 -45.7 Dark Down 46.7 95.2 Up 04:42:39 - 05:12:39 1228
Quincy 04:57:40 -45.6 Dark Down 46.7 94.9 Up 04:42:40 - 05:12:40 1209
Portola 04:57:39 -46.0 Dark Down 47.0 95.1 Up 04:42:39 - 05:12:39 1187
Reno 04:57:38 -46.5 Dark Down 47.6 95.3 Up 04:42:38 - 05:12:38 1148
Carson City 04:57:38 -46.6 Dark Down 47.6 94.9 Up 04:42:38 - 05:12:38 1110
Gardnerville 04:57:39 -46.7 Dark Down 47.7 94.7 Up 04:42:39 - 05:12:39 1083
Yerington 04:57:37 -47.1 Dark Down 48.1 95.1 Up 04:42:37 - 05:12:37 1078
Hawthorne 04:57:36 -47.6 Dark Down 48.6 95.0 Up 04:42:36 - 05:12:36 1020
Niwot 04:56:59 -57.1 Dark Down 58.3 108.3 Up 04:41:59 - 05:11:59 1008
SwRI 04:56:59 -57.0 Dark Down 58.3 108.1 Up 04:41:59 - 05:11:59 998
Lee Vining 04:57:38 -47.3 Dark Down 48.2 94.0 Up 04:42:38 - 05:12:38 969
Tonopah 04:57:33 -48.8 Dark Down 49.7 95.4 Up 04:42:33 - 05:12:33 946
Bishop 04:57:37 -48.0 Dark Down 48.8 93.8 Up 04:42:37 - 05:12:37 893
Beatty 04:57:34 -49.3 Dark Down 50.2 94.4 Up 04:42:34 - 05:12:34 816
Indian Springs 04:57:31 -50.2 Dark Down 51.1 94.7 Up 04:42:31 - 05:12:31 763
CPSLO 04:57:46 -46.4 Dark Down 47.1 90.2 Up 04:42:46 - 05:12:46 717
Henderson 04:57:30 -50.8 Dark Down 51.7 94.5 Up 04:42:30 - 05:12:30 695
Searchlight/Boulder City 04:57:31 -51.0 Dark Down 51.7 93.8 Up 04:42:31 - 05:12:31 632
Patrick 04:57:27 -51.8 Dark Down 52.6 94.4 Up 04:42:27 - 05:12:27 610
Laughlin/Bullhead City 04:57:30 -51.3 Dark Down 52.0 93.7 Up 04:42:30 - 05:12:30 595
Kingman/Dolan Springs 04:57:28 -51.7 Dark Down 52.5 94.0 Up 04:42:28 - 05:12:28 589
DCO 04:57:26 -52.4 Dark Down 53.2 94.5 Up 04:42:26 - 05:12:26 566
Mohave Valley 04:57:30 -51.3 Dark Down 52.1 93.3 Up 04:42:30 - 05:12:30 565
Wildwood 04:57:42 -48.2 Dark Down 48.8 90.0 Up 04:42:42 - 05:12:42 549
Lake Havasu City 04:57:30 -51.6 Dark Down 52.3 93.0 Up 04:42:30 - 05:12:30 518
Parker 04:57:30 -51.7 Dark Down 52.3 92.5 Up 04:42:30 - 05:12:30 480
Idyllwild 04:57:37 -49.7 Dark Down 50.4 90.6 Up 04:42:37 - 05:12:37 477
Blythe 04:57:31 -51.5 Dark Down 52.1 91.7 Up 04:42:31 - 05:12:31 428
George/Scottsdale 04:57:24 -53.7 Dark Down 54.4 93.4 Up 04:42:24 - 05:12:24 397
Calipatria 04:57:35 -50.8 Dark Down 51.3 90.5 Up 04:42:35 - 05:12:35 390
Yuma 04:57:33 -51.5 Dark Down 52.1 90.5 Up 04:42:33 - 05:12:33 329

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 98WX31, (2027/01/09 04:55UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +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
98WX31         07:23:42.0 +24:57:43 15.3       166
Positions are for J2000

Event circumstances last updated at 2019/10/04 23:02:34 UT

Marc W. Buie, Southwest Research Institute

RECON