RECON: TNO occultation with 98WV31

Event between 98WV31 and star GA1140:00992669 with event index number of 1141852

Geocentric closest approach at 2021/12/16 07:58:31 UTC

J2000 position of star is 05:07:46.2 +24:53:53
Equinox of date position of star is 05:08:57.7 +24:55:20
Stellar brightness G=13.3, use SENSEUP=32
Star is 25 degrees from the moon. Moon is 93% illuminated.
TNO apparent brightness V=24.0

[RECON map]
TNO is 39.3 AU from the Sun and 38.3 AU from the Earth.
The TNO is moving 25.5 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 441 seconds.
The 1-sigma cross-track error in the shadow position is 2548 km.
The sky-plane scale is 27798.6 km/arcsec.

The TNO has an absolute magnitude Hv=8.1
Diameter=144.5 km assuming a 5% albedo -- 5.7 sec chord
Diameter=59.0 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 98WV31, (2021/12/16 07:59UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.0 +16:33:06  0.8 11.21  17
Alnath         05:27:40.9 +28:37:26  1.6  5.55  29
103 Tau        05:09:27.1 +24:17:32  5.3  0.64  25
PPM 094048     05:06:32.1 +23:49:39  8.3  1.25  24
PPM 094077     05:09:01.5 +24:51:10  9.6  0.08  25
98WV31         05:09:07.0 +24:55:31 13.3        25
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 2.0 sigma about the mid-time.
The median site spacing is 22.7 km RECON observability=1.0 and success probability=19.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:58:01 -63.4 Dark Up 64.2 197.6 Up 07:43:01 - 08:13:01 23
Summerland 07:58:01 -63.7 Dark Up 64.5 197.2 Up 07:43:01 - 08:13:01 -6
Penticton 07:58:01 -63.8 Dark Up 64.6 197.5 Up 07:43:01 - 08:13:01 -13
Okanagan Falls 07:58:01 -64.0 Dark Up 64.7 197.6 Up 07:43:01 - 08:13:01 -32
Oliver 07:58:01 -64.1 Dark Up 64.9 197.7 Up 07:43:01 - 08:13:01 -49
Anarchist Mountain Observatory 07:58:00 -64.3 Dark Up 65.0 198.2 Up 07:43:00 - 08:13:00 -67
Oroville 07:58:01 -64.4 Dark Up 65.1 198.1 Up 07:43:01 - 08:13:01 -74
Tonasket 07:58:00 -64.6 Dark Up 65.3 198.3 Up 07:43:00 - 08:13:00 -98
Okanogan 07:58:01 -64.9 Dark Up 65.7 198.2 Up 07:43:01 - 08:13:01 -132
Brewster 07:58:01 -65.2 Dark Up 66.0 198.0 Up 07:43:01 - 08:13:01 -160
Manson/Chelan 07:58:02 -65.4 Dark Up 66.2 197.3 Up 07:43:02 - 08:13:02 -180
Entiat 07:58:03 -65.7 Dark Up 66.5 197.3 Up 07:43:03 - 08:13:03 -203
Wenatchee 07:58:03 -65.9 Dark Up 66.7 197.3 Up 07:43:03 - 08:13:03 -229
Ellensburg 07:58:03 -66.3 Dark Up 67.2 197.1 Up 07:43:03 - 08:13:03 -271
Yakima 07:58:04 -66.7 Dark Up 67.6 197.3 Up 07:43:04 - 08:13:04 -313
Toppenish/White Swan 07:58:03 -67.0 Dark Up 67.7 197.9 Up 07:43:03 - 08:13:03 -336
Pasco 07:57:59 -67.0 Dark Up 67.6 200.9 Up 07:42:59 - 08:12:59 -350
PNWRO 07:57:58 -67.3 Dark Up 67.7 201.6 Up 07:42:58 - 08:12:58 -376
George/Umatilla 07:58:00 -67.4 Dark Up 67.9 200.6 Up 07:43:00 - 08:13:00 -385
Goldendale 07:58:04 -67.5 Dark Up 68.3 197.3 Up 07:43:04 - 08:13:04 -393
The Dalles 07:58:05 -67.7 Dark Up 68.6 196.6 Up 07:43:05 - 08:13:05 -415
Maupin 07:58:05 -68.1 Dark Up 69.0 197.1 Up 07:43:05 - 08:13:05 -459
Madras/Culver 07:58:05 -68.7 Dark Up 69.5 197.5 Up 07:43:05 - 08:13:05 -516
Sisters 07:58:06 -69.0 Dark Up 70.0 196.6 Up 07:43:06 - 08:13:06 -550
Redmond 07:58:05 -69.0 Dark Up 69.9 197.6 Up 07:43:05 - 08:13:05 -554
Bend 07:58:06 -69.3 Dark Up 70.1 197.5 Up 07:43:06 - 08:13:06 -576
Oregon Observatory 07:58:06 -69.4 Dark Up 70.3 197.3 Up 07:43:06 - 08:13:06 -594
La Pine/Gilchrist 07:58:06 -69.6 Dark Up 70.5 197.3 Up 07:43:06 - 08:13:06 -615
North Lake 07:58:04 -70.1 Dark Up 70.8 199.2 Up 07:43:04 - 08:13:04 -662
Paisley 07:58:03 -70.6 Dark Up 71.2 200.7 Up 07:43:03 - 08:13:03 -722
Chiloquin 07:58:08 -70.7 Dark Up 71.7 197.3 Up 07:43:08 - 08:13:08 -732
Klamath Falls 07:58:07 -71.1 Dark Up 72.0 197.8 Up 07:43:07 - 08:13:07 -768
Lakeview 07:58:02 -71.1 Dark Up 71.7 201.8 Up 07:43:02 - 08:13:02 -776
Tulelake 07:58:06 -71.4 Dark Up 72.2 198.9 Up 07:43:06 - 08:13:06 -798
Cedarville 07:58:02 -71.8 Dark Up 72.2 203.1 Up 07:43:02 - 08:13:02 -846
Fall River/Burney 07:58:06 -72.3 Dark Up 73.0 200.1 Up 07:43:06 - 08:13:06 -895
Niwot 07:57:14 -68.9 Dark Up 65.9 237.7 Up 07:42:14 - 08:12:14 -956
Susanville 07:58:04 -72.9 Dark Up 73.4 203.1 Up 07:43:04 - 08:13:04 -964
SwRI 07:57:14 -69.0 Dark Up 66.0 237.8 Up 07:42:14 - 08:12:14 -968
Greenville 07:58:04 -73.2 Dark Up 73.7 202.6 Up 07:43:04 - 08:13:04 -993
Gimple 07:58:04 -73.2 Dark Up 73.7 202.8 Up 07:43:04 - 08:13:04 -993
Quincy 07:58:04 -73.4 Dark Up 73.9 202.9 Up 07:43:04 - 08:13:04 -1015
Portola 07:58:03 -73.5 Dark Up 73.9 204.5 Up 07:43:03 - 08:13:03 -1029
Reno 07:58:01 -73.8 Dark Up 73.9 206.8 Up 07:43:01 - 08:13:01 -1059
Carson City 07:58:01 -74.1 Dark Up 74.2 207.5 Up 07:43:01 - 08:13:01 -1098
Yerington 07:57:59 -74.3 Dark Up 74.2 209.7 Up 07:42:59 - 08:12:59 -1120
Gardnerville 07:58:00 -74.4 Dark Up 74.4 208.0 Up 07:43:00 - 08:13:00 -1124
Hawthorne 07:57:57 -74.7 Dark Up 74.3 212.1 Up 07:42:57 - 08:12:57 -1170
Tonopah 07:57:52 -75.0 Dark Up 74.1 217.1 Up 07:42:52 - 08:12:52 -1222
Lee Vining 07:57:58 -75.3 Dark Up 75.0 211.7 Up 07:42:58 - 08:12:58 -1231
Bishop 07:57:56 -75.8 Dark Up 75.2 215.2 Up 07:42:56 - 08:12:56 -1296
Beatty 07:57:50 -76.0 Dark Up 74.8 221.0 Up 07:42:50 - 08:12:50 -1347
Lone Pine 07:57:55 -76.5 Dark Up 75.7 218.0 Up 07:42:55 - 08:12:55 -1379
Indian Springs 07:57:46 -76.1 Dark Up 74.4 224.7 Up 07:42:46 - 08:12:46 -1382
Henderson 07:57:44 -76.4 Dark Up 74.4 227.9 Up 07:42:44 - 08:12:44 -1439
Searchlight/Boulder City 07:57:44 -76.9 Dark Up 74.8 229.6 Up 07:42:44 - 08:12:44 -1502
Patrick 07:57:40 -76.6 Dark Up 74.1 232.3 Up 07:42:40 - 08:12:40 -1506
CPSLO 07:58:03 -78.0 Dark Up 77.9 212.4 Up 07:43:03 - 08:13:03 -1517
Kingman/Dolan Springs 07:57:41 -76.9 Dark Up 74.4 232.5 Up 07:42:41 - 08:12:41 -1530
Laughlin/Bullhead City 07:57:43 -77.1 Dark Up 74.7 231.3 Up 07:42:43 - 08:12:43 -1534
DCO 07:57:38 -76.6 Dark Up 73.9 234.7 Up 07:42:38 - 08:12:38 -1538
Mohave Valley 07:57:42 -77.3 Dark Up 74.9 232.1 Up 07:42:42 - 08:12:42 -1564
Lake Havasu City 07:57:42 -77.6 Dark Up 75.0 233.9 Up 07:42:42 - 08:12:42 -1607
Parker 07:57:41 -77.9 Dark Up 75.2 235.0 Up 07:42:41 - 08:12:41 -1645
Wildwood 07:57:56 -79.1 Dark Up 77.9 223.2 Up 07:42:56 - 08:12:56 -1653
Idyllwild 07:57:50 -79.1 Dark Up 77.0 230.1 Up 07:42:50 - 08:12:50 -1693
Blythe 07:57:42 -78.5 Dark Up 75.7 236.0 Up 07:42:42 - 08:12:42 -1704
Calipatria 07:57:45 -79.3 Dark Up 76.6 235.4 Up 07:42:45 - 08:12:45 -1759
Yuma 07:57:42 -79.3 Dark Up 76.2 239.0 Up 07:42:42 - 08:12:42 -1805

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 98WV31, (2021/12/16 07:59UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 11.21  17
Alnath         05:26:17.5 +28:36:23  1.6  5.55  29
103 Tau        05:08:06.6 +24:15:54  5.3  0.64  25
PPM 094048     05:05:12.0 +23:47:56  8.3  1.25  24
PPM 094077     05:07:40.7 +24:49:32  9.6  0.08  25
98WV31         05:07:46.2 +24:53:53 13.3        25
Positions are for J2000

Event circumstances last updated at 2019/06/08 02:47:50 UT

Marc W. Buie, Southwest Research Institute

RECON