RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1300:02393593 with event index number of 1106138

Geocentric closest approach at 2021/11/10 09:20:42 UTC

J2000 position of star is 05:07:54.6 +41:45:15
Equinox of date position of star is 05:09:26.9 +41:46:52
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 135 degrees from the moon. Moon is 38% illuminated.
TNO apparent brightness V=23.5

[RECON map]
TNO is 37.6 AU from the Sun and 36.8 AU from the Earth.
The TNO is moving 22.0 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 258 seconds.
The 1-sigma cross-track error in the shadow position is 3430 km.
The sky-plane scale is 26682.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 7.9 sec chord
Diameter=70.9 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2021/11/10 09:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.6 +16:33:05  0.8 26.16 125
3Iot Aur       04:58:25.2 +33:11:55  2.7  8.86 133
10Eta Aur      05:08:03.1 +41:15:43  3.2  0.58 135
PPM 047736     05:08:51.3 +42:07:22  8.0  0.36 135
PPM 047765     05:10:23.2 +41:46:01  8.6  0.17 135
181855         05:09:27.3 +41:46:52 16.7       135
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 3.5 sigma about the mid-time.
The median site spacing is 27.6 km RECON observability=1.0 and success probability=14.9%
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 09:21:12 -51.4 Dark Down 80.5 150.7 Up 09:06:12 - 09:36:12 1689
Kelowna 09:21:12 -51.7 Dark Down 80.8 148.9 Up 09:06:12 - 09:36:12 1645
Peachland 09:21:13 -52.0 Dark Down 80.8 147.3 Up 09:06:13 - 09:36:13 1629
Summerland 09:21:13 -52.0 Dark Down 80.9 147.2 Up 09:06:13 - 09:36:13 1614
Penticton 09:21:12 -52.0 Dark Down 81.0 147.4 Up 09:06:12 - 09:36:12 1608
Oliver 09:21:12 -52.3 Dark Down 81.3 146.2 Up 09:06:12 - 09:36:12 1569
Anarchist Mountain Observatory 09:21:11 -52.3 Dark Down 81.5 146.4 Up 09:06:11 - 09:36:11 1553
Tonasket 09:21:11 -52.6 Dark Down 81.7 144.9 Up 09:06:11 - 09:36:11 1518
Okanogan 09:21:12 -52.9 Dark Down 82.0 142.9 Up 09:06:12 - 09:36:12 1480
Victoria 09:21:24 -54.4 Dark Down 80.1 129.3 Up 09:06:24 - 09:36:24 1461
Brewster 09:21:12 -53.2 Dark Down 82.1 140.8 Up 09:06:12 - 09:36:12 1448
Manson/Chelan 09:21:13 -53.5 Dark Down 82.1 138.2 Up 09:06:13 - 09:36:13 1421
Wenatchee 09:21:14 -54.0 Dark Down 82.4 135.1 Up 09:06:14 - 09:36:14 1367
Ellensburg 09:21:14 -54.4 Dark Down 82.5 131.9 Up 09:06:14 - 09:36:14 1320
Yakima 09:21:13 -54.7 Dark Down 82.8 129.4 Up 09:06:13 - 09:36:13 1275
Pasco 09:21:09 -54.3 Dark Down 83.7 133.8 Up 09:06:09 - 09:36:09 1254
Toppenish/White Swan 09:21:13 -54.8 Dark Down 83.0 128.8 Up 09:06:13 - 09:36:13 1253
PNWRO 09:21:08 -54.3 Dark Down 84.0 133.3 Up 09:06:08 - 09:36:08 1229
Goldendale 09:21:14 -55.4 Dark Down 83.1 123.4 Up 09:06:14 - 09:36:14 1187
The Dalles 09:21:15 -55.7 Dark Down 83.0 120.4 Up 09:06:15 - 09:36:15 1159
Maupin 09:21:14 -56.0 Dark Down 83.3 117.8 Up 09:06:14 - 09:36:14 1114
Redmond 09:21:15 -56.7 Dark Down 83.6 110.3 Up 09:06:15 - 09:36:15 1013
Sisters 09:21:16 -56.9 Dark Down 83.3 109.4 Up 09:06:16 - 09:36:16 1012
Bend 09:21:15 -56.9 Dark Down 83.6 108.1 Up 09:06:15 - 09:36:15 988
Oregon Observatory 09:21:15 -57.1 Dark Down 83.5 106.3 Up 09:06:15 - 09:36:15 968
La Pine/Gilchrist 09:21:15 -57.3 Dark Down 83.5 104.4 Up 09:06:15 - 09:36:15 945
North Lake 09:21:13 -57.3 Dark Down 84.0 101.8 Up 09:06:13 - 09:36:13 903
Dunrhomin 09:20:13 -49.3 Dark Down 84.0 287.0 Up 09:05:13 - 09:35:13 868
Paisley 09:21:11 -57.5 Dark Down 84.4 97.1 Up 09:06:11 - 09:36:11 846
Chiloquin 09:21:16 -58.3 Dark Down 83.5 94.2 Up 09:06:16 - 09:36:16 818
Lakeview 09:21:10 -57.8 Dark Down 84.6 92.1 Up 09:06:10 - 09:36:10 793
Klamath Falls 09:21:15 -58.5 Dark Down 83.5 91.3 Up 09:06:15 - 09:36:15 781
Cedarville 09:21:09 -58.1 Dark Down 84.7 85.2 Up 09:06:09 - 09:36:09 722
Fall River/Burney 09:21:13 -59.1 Dark Down 83.7 80.8 Up 09:06:13 - 09:36:13 655
Susanville 09:21:10 -59.1 Dark Down 84.1 74.3 Up 09:06:10 - 09:36:10 594
Gimple 09:21:11 -59.4 Dark Down 83.9 72.1 Up 09:06:11 - 09:36:11 561
Greenville 09:21:11 -59.5 Dark Down 83.8 72.3 Up 09:06:11 - 09:36:11 561
Quincy 09:21:11 -59.6 Dark Down 83.8 70.5 Up 09:06:11 - 09:36:11 538
Portola 09:21:09 -59.4 Dark Down 84.1 68.5 Up 09:06:09 - 09:36:09 530
Reno 09:21:06 -59.2 Dark Down 84.4 64.5 Up 09:06:06 - 09:36:06 509
Carson City 09:21:06 -59.4 Dark Down 84.3 61.2 Up 09:06:06 - 09:36:06 470
Yerington 09:21:03 -59.2 Dark Down 84.6 57.4 Up 09:06:03 - 09:36:03 456
Gardnerville 09:21:05 -59.5 Dark Down 84.2 59.0 Up 09:06:05 - 09:36:05 443
Hawthorne 09:21:01 -59.1 Dark Down 84.6 51.2 Up 09:06:01 - 09:36:01 413
Tonopah 09:20:55 -58.5 Dark Down 85.1 39.8 Up 09:05:55 - 09:35:55 382
Lee Vining 09:21:02 -59.8 Dark Down 84.0 49.0 Up 09:06:02 - 09:36:02 344
Bishop 09:20:59 -59.6 Dark Down 84.0 41.6 Up 09:05:59 - 09:35:59 289
Beatty 09:20:52 -58.8 Dark Down 84.3 29.7 Up 09:05:52 - 09:35:52 263
Indian Springs 09:20:48 -58.3 Dark Down 84.4 21.1 Up 09:05:48 - 09:35:48 245
Henderson 09:20:44 -58.0 Dark Down 84.1 14.7 Up 09:05:44 - 09:35:44 200
Patrick 09:20:39 -57.5 Dark Down 83.6 6.2 Up 09:05:39 - 09:35:39 153
Kingman/Dolan Springs 09:20:40 -57.8 Dark Down 83.4 7.2 Up 09:05:40 - 09:35:40 125
Laughlin/Bullhead City 09:20:42 -58.1 Dark Down 83.3 10.4 Up 09:05:42 - 09:35:42 113
Mohave Valley 09:20:42 -58.3 Dark Down 83.0 9.9 Up 09:05:42 - 09:35:42 84
Lake Havasu City 09:20:40 -58.3 Dark Down 82.7 8.0 Up 09:05:40 - 09:35:40 45
CPSLO 09:21:06 -62.3 Dark Down 81.2 40.4 Up 09:06:06 - 09:36:06 34
George/Scottsdale 09:20:30 -56.7 Dark Down 81.9 354.4 Up 09:05:30 - 09:35:30 12
Parker 09:20:40 -58.4 Dark Down 82.3 7.5 Up 09:05:40 - 09:35:40 8
Blythe 09:20:40 -58.8 Dark Down 81.8 8.6 Up 09:05:40 - 09:35:40 -54
Wildwood 09:20:57 -61.5 Dark Down 81.2 28.2 Up 09:05:57 - 09:35:57 -70
Idyllwild 09:20:49 -60.3 Dark Down 81.5 19.0 Up 09:05:49 - 09:35:49 -79
Calipatria 09:20:44 -59.7 Dark Down 81.1 12.5 Up 09:05:44 - 09:35:44 -124
Yuma 09:20:40 -59.2 Dark Down 80.8 7.9 Up 09:05:40 - 09:35:40 -154

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 181855, (2021/11/10 09:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 26.16 125
3Iot Aur       04:56:59.6 +33:09:58  2.7  8.86 133
10Eta Aur      05:06:30.9 +41:14:03  3.2  0.58 135
PPM 047736     05:07:18.4 +42:05:44  8.0  0.36 135
PPM 047765     05:08:50.5 +41:44:25  8.6  0.17 135
181855         05:07:54.6 +41:45:15 16.7       135
Positions are for J2000

Event circumstances last updated at 2021/10/10 01:00:18 UT

Marc W. Buie, Southwest Research Institute

RECON