RECON: TNO occultation with 98WY31

Event between 98WY31 and star GA1140:02563559 with event index number of 1141522

Geocentric closest approach at 2022/01/23 06:10:15 UTC

J2000 position of star is 06:51:11.7 +24:10:50
Equinox of date position of star is 06:52:22.6 +24:09:23
Stellar brightness G=15.1, use SENSEUP=128
Star is 83 degrees from the moon. Moon is 74% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 42.8 AU from the Sun and 41.8 AU from the Earth.
The TNO is moving 23.6 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 584 seconds.
The 1-sigma cross-track error in the shadow position is 4204 km.
The sky-plane scale is 30350.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=237.7 km assuming a 5% albedo -- 10.9 sec chord
Diameter=97.0 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY31, (2022/01/23 06:10UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:39.9 +27:58:16  1.1 12.73  71
Alhena         06:38:59.2 +16:22:43  1.9  8.40  86
37 Gem         06:56:40.0 +25:20:46  6.3  1.52  82
PPM 096615     06:51:59.2 +23:39:58  8.4  0.50  83
PPM 096609     06:51:36.8 +24:07:47  8.8  0.21  83
PPM 096631     06:52:38.6 +24:08:15 11.1  0.03  83
98WY31         06:52:32.4 +24:09:11 15.1        82
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 1.5 sigma about the mid-time.
The median site spacing is 24.7 km RECON observability=1.0 and success probability=6.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:10:48 -51.5 Dark Up 63.7 165.6 Up 05:55:48 - 06:25:48 -5454
Summerland 06:10:49 -51.6 Dark Up 64.0 164.9 Up 05:55:49 - 06:25:49 -5484
Penticton 06:10:48 -51.7 Dark Up 64.0 165.1 Up 05:55:48 - 06:25:48 -5491
Okanagan Falls 06:10:48 -51.8 Dark Up 64.2 164.9 Up 05:55:48 - 06:25:48 -5510
Oliver 06:10:48 -51.9 Dark Up 64.4 164.9 Up 05:55:48 - 06:25:48 -5526
Anarchist Mountain Observatory 06:10:47 -52.1 Dark Up 64.6 165.2 Up 05:55:47 - 06:25:47 -5543
Oroville 06:10:48 -52.1 Dark Up 64.6 165.0 Up 05:55:48 - 06:25:48 -5551
Tonasket 06:10:48 -52.3 Dark Up 64.9 164.9 Up 05:55:48 - 06:25:48 -5575
Okanogan 06:10:48 -52.4 Dark Up 65.2 164.4 Up 05:55:48 - 06:25:48 -5609
Brewster 06:10:49 -52.5 Dark Up 65.4 163.8 Up 05:55:49 - 06:25:49 -5637
Manson/Chelan 06:10:50 -52.4 Dark Up 65.5 162.9 Up 05:55:50 - 06:25:50 -5659
Entiat 06:10:51 -52.5 Dark Up 65.7 162.6 Up 05:55:51 - 06:25:51 -5682
Wenatchee 06:10:51 -52.6 Dark Up 65.9 162.2 Up 05:55:51 - 06:25:51 -5708
Ellensburg 06:10:51 -52.8 Dark Up 66.3 161.4 Up 05:55:51 - 06:25:51 -5751
Yakima 06:10:52 -53.0 Dark Up 66.7 161.1 Up 05:55:52 - 06:25:52 -5793
Toppenish/White Swan 06:10:52 -53.2 Dark Up 66.9 161.3 Up 05:55:52 - 06:25:52 -5815
Pasco 06:10:47 -54.0 Dark Up 67.3 164.1 Up 05:55:47 - 06:25:47 -5824
PNWRO 06:10:47 -54.3 Dark Up 67.6 164.5 Up 05:55:47 - 06:25:47 -5849
George/Umatilla 06:10:47 -54.1 Dark Up 67.6 163.4 Up 05:55:47 - 06:25:47 -5860
Goldendale 06:10:53 -53.3 Dark Up 67.3 159.9 Up 05:55:53 - 06:25:53 -5873
The Dalles 06:10:54 -53.2 Dark Up 67.5 158.9 Up 05:55:54 - 06:25:54 -5897
Maupin 06:10:54 -53.5 Dark Up 67.9 158.8 Up 05:55:54 - 06:25:54 -5940
Madras/Culver 06:10:54 -53.8 Dark Up 68.4 158.2 Up 05:55:54 - 06:25:54 -5997
Sisters 06:10:56 -53.7 Dark Down 68.6 156.8 Up 05:55:56 - 06:25:56 -6033
Redmond 06:10:54 -54.0 Dark Up 68.7 157.7 Up 05:55:54 - 06:25:54 -6035
Bend 06:10:54 -54.0 Dark Up 68.9 157.2 Up 05:55:54 - 06:25:54 -6057
Oregon Observatory 06:10:55 -54.0 Dark Up 69.0 156.7 Up 05:55:55 - 06:25:55 -6076
La Pine/Gilchrist 06:10:55 -54.1 Dark Up 69.1 156.3 Up 05:55:55 - 06:25:55 -6097
North Lake 06:10:53 -54.7 Dark Up 69.7 157.4 Up 05:55:53 - 06:25:53 -6142
Paisley 06:10:52 -55.2 Dark Up 70.3 157.7 Up 05:55:52 - 06:25:52 -6199
Chiloquin 06:10:57 -54.5 Dark Down 70.1 154.2 Up 05:55:57 - 06:25:57 -6215
Klamath Falls 06:10:56 -54.7 Dark Down 70.4 154.0 Up 05:55:56 - 06:25:56 -6251
Lakeview 06:10:51 -55.6 Dark Up 70.9 157.6 Up 05:55:51 - 06:25:51 -6253
Tulelake 06:10:56 -55.0 Dark Down 70.7 154.5 Up 05:55:56 - 06:25:56 -6279
Cedarville 06:10:51 -56.1 Dark Up 71.5 157.4 Up 05:55:51 - 06:25:51 -6322
Niwot 06:09:57 -65.4 Dark Up 73.0 202.7 Up 05:54:57 - 06:24:57 -6371
Fall River/Burney 06:10:55 -55.5 Dark Down 71.6 153.5 Up 05:55:55 - 06:25:55 -6376
SwRI 06:09:59 -65.4 Dark Up 73.1 202.5 Up 05:54:59 - 06:24:59 -6383
Susanville 06:10:53 -56.3 Dark Up 72.4 154.7 Up 05:55:53 - 06:25:53 -6442
Greenville 06:10:54 -56.2 Dark Up 72.5 153.5 Up 05:55:54 - 06:25:54 -6472
Gimple 06:10:54 -56.3 Dark Up 72.6 153.7 Up 05:55:54 - 06:25:54 -6472
Quincy 06:10:54 -56.3 Dark Up 72.7 153.2 Up 05:55:54 - 06:25:54 -6493
Portola 06:10:52 -56.7 Dark Up 73.0 154.3 Up 05:55:52 - 06:25:52 -6506
Reno 06:10:50 -57.3 Dark Up 73.4 155.9 Up 05:55:50 - 06:25:50 -6533
Carson City 06:10:50 -57.5 Dark Up 73.8 155.4 Up 05:55:50 - 06:25:50 -6571
Yerington 06:10:47 -58.0 Dark Up 74.1 157.1 Up 05:55:47 - 06:25:47 -6590
Gardnerville 06:10:50 -57.6 Dark Up 74.0 155.2 Up 05:55:50 - 06:25:50 -6597
Hawthorne 06:10:46 -58.6 Dark Up 74.7 158.1 Up 05:55:46 - 06:25:46 -6639
Tonopah 06:10:41 -59.8 Dark Up 75.5 162.3 Up 05:55:41 - 06:25:41 -6684
Lee Vining 06:10:47 -58.5 Dark Up 75.1 155.7 Up 05:55:47 - 06:25:47 -6701
Bishop 06:10:44 -59.3 Dark Up 75.9 157.2 Up 05:55:44 - 06:25:44 -6763
Beatty 06:10:38 -60.6 Dark Up 76.7 162.5 Up 05:55:38 - 06:25:38 -6807
Indian Springs 06:10:34 -61.5 Dark Up 77.3 166.3 Up 05:55:34 - 06:25:34 -6837
Lone Pine 06:10:43 -59.9 Dark Up 76.7 157.2 Up 05:55:43 - 06:25:43 -6844
Henderson 06:10:32 -62.3 Dark Up 77.9 168.7 Up 05:55:32 - 06:25:32 -6891
Patrick 06:10:28 -63.4 Dark Up 78.7 173.1 Up 05:55:28 - 06:25:28 -6952
Searchlight/Boulder City 06:10:31 -62.6 Dark Up 78.5 168.4 Up 05:55:31 - 06:25:31 -6953
Kingman/Dolan Springs 06:10:29 -63.4 Dark Up 78.9 172.1 Up 05:55:29 - 06:25:29 -6977
DCO 06:10:25 -64.0 Dark Up 79.1 176.3 Up 05:55:25 - 06:25:25 -6981
Laughlin/Bullhead City 06:10:30 -63.0 Dark Up 78.9 169.7 Up 05:55:30 - 06:25:30 -6983
CPSLO 06:10:53 -58.5 Dark Up 76.8 145.3 Up 05:55:53 - 06:25:53 -6993
Mohave Valley 06:10:29 -63.1 Dark Up 79.1 169.4 Up 05:55:29 - 06:25:29 -7013
Lake Havasu City 06:10:29 -63.5 Dark Up 79.6 170.3 Up 05:55:29 - 06:25:29 -7055
Parker 06:10:29 -63.7 Dark Up 79.9 170.1 Up 05:55:29 - 06:25:29 -7093
Wildwood 06:10:45 -60.5 Dark Up 78.7 150.0 Up 05:55:45 - 06:25:45 -7120
Idyllwild 06:10:38 -62.1 Dark Up 79.7 157.5 Up 05:55:38 - 06:25:38 -7151
Blythe 06:10:29 -63.7 Dark Up 80.4 167.9 Up 05:55:29 - 06:25:29 -7152
Calipatria 06:10:33 -63.2 Dark Up 80.6 162.2 Up 05:55:33 - 06:25:33 -7211
Yuma 06:10:31 -64.1 Dark Up 81.3 166.5 Up 05:55:31 - 06:25:31 -7253

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 98WY31, (2022/01/23 06:10UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +28:01:33  1.1 12.73  71
Alhena         06:37:42.8 +16:23:57  1.9  8.40  86
37 Gem         06:55:18.6 +25:22:33  6.3  1.52  82
PPM 096615     06:50:38.7 +23:41:36  8.4  0.50  83
PPM 096609     06:50:16.0 +24:09:24  8.8  0.21  83
PPM 096631     06:51:17.8 +24:09:54 11.1  0.03  83
98WY31         06:51:11.7 +24:10:50 15.1        83
Positions are for J2000

Event circumstances last updated at 2019/05/23 23:04:57 UT

Marc W. Buie, Southwest Research Institute

RECON