RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1300:02065362 with event index number of 224239

Geocentric closest approach at 2019/11/06 08:00:47 UTC

J2000 position of star is 04:52:18.7 +40:03:39
Equinox of date position of star is 04:53:36.8 +40:05:28
Stellar brightness G=13.7, use SENSEUP=64
Star is 103 degrees from the moon. Moon is 68% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 37.6 AU from the Sun and 36.8 AU from the Earth.
The TNO is moving 21.7 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 241 seconds.
The 1-sigma cross-track error in the shadow position is 3427 km.
The sky-plane scale is 26691.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 9.6 sec chord
Diameter=85.3 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2019/11/06 08:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.7 +16:32:52  0.8 23.82  95
3Iot Aur       04:58:17.4 +33:11:44  2.7  6.96 103
5 Aur          05:01:40.4 +39:25:23  6.4  1.67 104
PPM 047520     04:57:54.0 +40:11:56  8.0  0.81 104
PPM 047462     04:55:18.5 +40:02:14  9.7  0.32 103
PPM 069694     04:52:52.5 +40:01:12 10.9  0.17 103
181855         04:53:41.1 +40:05:33 13.7       103
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 3.7 sigma about the mid-time.
The median site spacing is 24.9 km RECON observability=1.0 and success probability=15.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:02:24 -55.8 Dark Up 68.9 107.6 Up 07:47:24 - 08:17:24 1166
Summerland 08:02:25 -55.8 Dark Up 68.7 107.1 Up 07:47:25 - 08:17:25 1164
Penticton 08:02:25 -56.1 Dark Up 68.9 106.5 Up 07:47:25 - 08:17:25 1127
Okanagan Falls 08:02:25 -56.3 Dark Up 69.0 106.0 Up 07:47:25 - 08:17:25 1107
Oliver 08:02:25 -56.5 Dark Up 69.0 105.6 Up 07:47:25 - 08:17:25 1089
Anarchist Mountain Observatory 08:02:24 -56.6 Dark Up 69.2 105.4 Up 07:47:24 - 08:17:24 1068
Oroville 08:02:25 -56.7 Dark Up 69.2 105.1 Up 07:47:25 - 08:17:25 1061
Tonasket 08:02:25 -56.9 Dark Up 69.2 104.6 Up 07:47:25 - 08:17:25 1035
Okanogan 08:02:26 -57.3 Dark Up 69.2 103.5 Up 07:47:26 - 08:17:26 999
Brewster 08:02:26 -57.6 Dark Up 69.1 102.6 Up 07:47:26 - 08:17:26 971
Manson/Chelan 08:02:28 -57.8 Dark Up 68.9 101.7 Up 07:47:28 - 08:17:28 951
Entiat 08:02:28 -58.0 Dark Up 68.9 101.0 Up 07:47:28 - 08:17:28 928
Wenatchee 08:02:29 -58.3 Dark Up 68.9 100.3 Up 07:47:29 - 08:17:29 901
Ellensburg 08:02:30 -58.7 Dark Up 68.9 99.0 Up 07:47:30 - 08:17:30 857
Yakima 08:02:30 -59.1 Dark Up 68.9 97.9 Up 07:47:30 - 08:17:30 813
Toppenish/White Swan 08:02:30 -59.3 Dark Up 69.0 97.5 Up 07:47:30 - 08:17:30 788
Pasco 08:02:25 -59.3 Dark Up 69.9 98.5 Up 07:47:25 - 08:17:25 764
PNWRO 08:02:25 -59.5 Dark Up 70.1 98.0 Up 07:47:25 - 08:17:25 735
Goldendale 08:02:31 -59.9 Dark Up 68.8 95.7 Up 07:47:31 - 08:17:31 731
George/Umatilla 08:02:27 -59.7 Dark Up 69.8 97.3 Up 07:47:27 - 08:17:27 728
The Dalles 08:02:33 -60.2 Dark Up 68.6 94.8 Up 07:47:33 - 08:17:33 709
Maupin 08:02:33 -60.6 Dark Up 68.7 93.9 Up 07:47:33 - 08:17:33 662
Madras/Culver 08:02:33 -61.1 Dark Up 68.7 92.4 Up 07:47:33 - 08:17:33 602
Sisters 08:02:35 -61.5 Dark Up 68.4 91.2 Up 07:47:35 - 08:17:35 570
Redmond 08:02:34 -61.5 Dark Up 68.7 91.5 Up 07:47:34 - 08:17:34 564
Bend 08:02:34 -61.7 Dark Up 68.6 90.8 Up 07:47:34 - 08:17:34 541
Oregon Observatory 08:02:35 -61.9 Dark Up 68.5 90.3 Up 07:47:35 - 08:17:35 524
La Pine/Gilchrist 08:02:35 -62.1 Dark Up 68.4 89.7 Up 07:47:35 - 08:17:35 502
North Lake 08:02:33 -62.5 Dark Up 68.9 89.0 Up 07:47:33 - 08:17:33 448
Paisley 08:02:32 -63.0 Dark Up 69.1 87.8 Up 07:47:32 - 08:17:32 383
Chiloquin 08:02:37 -63.2 Dark Up 68.2 86.7 Up 07:47:37 - 08:17:37 383
Klamath Falls 08:02:37 -63.6 Dark Up 68.2 85.9 Up 07:47:37 - 08:17:37 344
Lakeview 08:02:32 -63.5 Dark Up 69.2 86.6 Up 07:47:32 - 08:17:32 326
Tulelake 08:02:36 -63.8 Dark Up 68.4 85.4 Up 07:47:36 - 08:17:36 311
Cedarville 08:02:32 -64.1 Dark Up 69.3 84.9 Up 07:47:32 - 08:17:32 252
Fall River/Burney 08:02:36 -64.7 Dark Up 68.4 83.1 Up 07:47:36 - 08:17:36 210
Susanville 08:02:34 -65.2 Dark Up 68.8 81.8 Up 07:47:34 - 08:17:34 133
Greenville 08:02:35 -65.6 Dark Up 68.6 81.0 Up 07:47:35 - 08:17:35 106
Gimple 08:02:35 -65.5 Dark Up 68.6 81.1 Up 07:47:35 - 08:17:35 105
Quincy 08:02:35 -65.8 Dark Up 68.5 80.5 Up 07:47:35 - 08:17:35 84
Portola 08:02:34 -65.8 Dark Up 68.9 80.4 Up 07:47:34 - 08:17:34 65
Niwot 08:01:36 -60.5 Dark Down 80.4 86.2 Up 07:46:36 - 08:16:36 59
Reno 08:02:31 -66.0 Dark Up 69.3 79.9 Up 07:47:31 - 08:17:31 30
Carson City 08:02:32 -66.3 Dark Up 69.3 78.9 Up 07:47:32 - 08:17:32 -11
Yerington 08:02:29 -66.4 Dark Up 69.7 78.6 Up 07:47:29 - 08:17:29 -38
Gardnerville 08:02:31 -66.6 Dark Up 69.3 78.3 Up 07:47:31 - 08:17:31 -38
Hawthorne 08:02:27 -66.8 Dark Up 70.0 77.4 Up 07:47:27 - 08:17:27 -94
Lee Vining 08:02:30 -67.4 Dark Up 69.5 75.9 Up 07:47:30 - 08:17:30 -152
Tonopah 08:02:23 -66.9 Dark Up 71.0 76.3 Up 07:47:23 - 08:17:23 -156
Bishop 08:02:27 -67.8 Dark Up 69.9 74.3 Up 07:47:27 - 08:17:27 -224
Beatty 08:02:21 -67.9 Dark Up 71.0 73.1 Up 07:47:21 - 08:17:21 -287
Lone Pine 08:02:26 -68.5 Dark Up 69.9 72.3 Up 07:47:26 - 08:17:26 -310
Indian Springs 08:02:17 -67.9 Dark Up 71.7 72.0 Up 07:47:17 - 08:17:17 -330
Henderson 08:02:14 -68.1 Dark Up 72.1 70.3 Up 07:47:14 - 08:17:14 -392
CPSLO 08:02:37 -70.3 Dark Up 67.6 69.4 Up 07:47:37 - 08:17:37 -429
Searchlight/Boulder City 08:02:14 -68.6 Dark Up 71.9 68.6 Up 07:47:14 - 08:17:14 -456
Patrick 08:02:10 -68.3 Dark Up 72.7 68.1 Up 07:47:10 - 08:17:10 -466
Kingman/Dolan Springs 08:02:11 -68.5 Dark Up 72.5 67.5 Up 07:47:11 - 08:17:11 -490
Laughlin/Bullhead City 08:02:13 -68.7 Dark Up 72.1 67.7 Up 07:47:13 - 08:17:13 -490
DCO 08:02:07 -68.2 Dark Up 73.1 66.9 Up 07:47:07 - 08:17:07 -502
Mohave Valley 08:02:13 -69.0 Dark Up 72.0 66.9 Up 07:47:13 - 08:17:13 -520
Lake Havasu City 08:02:12 -69.2 Dark Up 72.0 65.7 Up 07:47:12 - 08:17:12 -565
Wildwood 08:02:29 -71.0 Dark Up 68.7 66.2 Up 07:47:29 - 08:17:29 -582
Parker 08:02:12 -69.5 Dark Up 71.9 64.7 Up 07:47:12 - 08:17:12 -604
Idyllwild 08:02:21 -70.8 Dark Up 69.9 64.7 Up 07:47:21 - 08:17:21 -636
Blythe 08:02:13 -70.1 Dark Up 71.4 63.4 Up 07:47:13 - 08:17:13 -661
Calipatria 08:02:17 -70.9 Dark Up 70.5 62.6 Up 07:47:17 - 08:17:17 -710
Yuma 08:02:13 -70.9 Dark Up 71.0 61.0 Up 07:47:13 - 08:17:13 -762

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, (2019/11/06 08:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 23.82  95
3Iot Aur       04:56:59.6 +33:09:58  2.7  6.96 103
5 Aur          05:00:18.3 +39:23:41  6.4  1.67 104
PPM 047520     04:56:31.4 +40:10:09  8.0  0.81 104
PPM 047462     04:53:56.1 +40:00:22  9.7  0.32 103
PPM 069694     04:51:30.2 +39:59:16 10.9  0.17 103
181855         04:52:18.7 +40:03:39 13.7       103
Positions are for J2000

Event circumstances last updated at 2018/10/24 22:04:03 UT

Marc W. Buie, Southwest Research Institute

RECON