RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1300:02227286 with event index number of 1003567

Geocentric closest approach at 2020/11/02 04:16:52 UTC

J2000 position of star is 05:00:33.7 +40:53:52
Equinox of date position of star is 05:01:53.1 +40:55:28
Stellar brightness G=14.9, use SENSEUP=128
Star is 29 degrees from the moon. Moon is 98% 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 20.4 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 237 seconds.
The 1-sigma cross-track error in the shadow position is 3210 km.
The sky-plane scale is 26723.1 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 10.2 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2020/11/02 04:17UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:07.1 +16:32:59  0.8 24.96  13
3Iot Aur       04:58:21.2 +33:11:50  2.7  7.76  23
8Zet Aur       05:03:56.3 +41:06:15  3.8  0.40  29
PPM 047586     05:01:46.3 +40:21:38  8.1  0.57  28
PPM 047594     05:02:11.2 +40:54:34  9.5  0.04  29
181855         05:02:01.1 +40:55:38 14.9        29
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 3.8 sigma about the mid-time.
The median site spacing is 21.8 km RECON observability=1.0 and success probability=14.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Summerland 04:20:55 -36.4 Dark Up 31.3 62.1 Up 04:05:55 - 04:35:55 2262
Kelowna 04:20:54 -36.6 Dark Up 31.5 62.4 Up 04:05:54 - 04:35:54 2249
Penticton 04:20:56 -36.6 Dark Up 31.3 62.1 Up 04:05:56 - 04:35:56 2228
Okanagan Falls 04:20:57 -36.7 Dark Up 31.2 62.0 Up 04:05:57 - 04:35:57 2215
Oliver 04:20:57 -36.8 Dark Up 31.1 61.9 Up 04:05:57 - 04:35:57 2201
Anarchist Mountain Observatory 04:20:57 -37.0 Dark Up 31.1 61.9 Up 04:05:57 - 04:35:57 2178
Oroville 04:20:58 -36.9 Dark Up 31.1 61.8 Up 04:05:58 - 04:35:58 2176
Tonasket 04:20:58 -37.0 Dark Up 31.0 61.7 Up 04:05:58 - 04:35:58 2157
Okanogan 04:21:00 -37.1 Dark Up 30.7 61.4 Up 04:06:00 - 04:36:00 2138
Manson/Chelan 04:21:02 -36.9 Dark Up 30.1 60.9 Up 04:06:02 - 04:36:02 2126
Brewster 04:21:01 -37.0 Dark Up 30.5 61.2 Up 04:06:01 - 04:36:01 2126
Entiat 04:21:03 -36.9 Dark Up 30.0 60.7 Low 04:06:03 - 04:36:03 2112
Wenatchee 04:21:04 -37.0 Dark Up 29.8 60.6 Low 04:06:04 - 04:36:04 2096
Ellensburg 04:21:05 -37.0 Dark Up 29.5 60.2 Low 04:06:05 - 04:36:05 2074
Yakima 04:21:06 -37.1 Dark Up 29.3 60.0 Low 04:06:06 - 04:36:06 2043
Toppenish/White Swan 04:21:07 -37.3 Dark Up 29.3 60.0 Low 04:06:07 - 04:36:07 2017
Goldendale 04:21:08 -37.2 Dark Up 28.7 59.5 Low 04:06:08 - 04:36:08 1994
The Dalles 04:21:09 -37.0 Dark Up 28.4 59.2 Low 04:06:09 - 04:36:09 1994
Maupin 04:21:11 -37.2 Dark Up 28.3 59.1 Low 04:06:11 - 04:36:11 1955
Pasco 04:21:06 -38.1 Dark Up 30.0 60.6 Low 04:06:06 - 04:36:06 1947
George/Umatilla 04:21:07 -38.1 Dark Up 29.7 60.3 Low 04:06:07 - 04:36:07 1931
PNWRO 04:21:07 -38.4 Dark Up 30.0 60.6 Low 04:06:07 - 04:36:07 1916
Madras/Culver 04:21:12 -37.3 Dark Up 28.0 58.8 Low 04:06:12 - 04:36:12 1914
Sisters 04:21:14 -37.1 Dark Up 27.5 58.5 Low 04:06:14 - 04:36:14 1909
Redmond 04:21:13 -37.4 Dark Up 27.7 58.6 Low 04:06:13 - 04:36:13 1887
Bend 04:21:14 -37.4 Dark Up 27.5 58.5 Low 04:06:14 - 04:36:14 1877
Oregon Observatory 04:21:14 -37.3 Dark Up 27.4 58.3 Low 04:06:14 - 04:36:14 1870
La Pine/Gilchrist 04:21:15 -37.4 Dark Up 27.2 58.2 Low 04:06:15 - 04:36:15 1856
North Lake 04:21:16 -37.9 Dark Up 27.4 58.3 Low 04:06:16 - 04:36:16 1791
Chiloquin 04:21:18 -37.4 Dark Up 26.4 57.6 Low 04:06:18 - 04:36:18 1785
Klamath Falls 04:21:19 -37.6 Dark Up 26.3 57.5 Low 04:06:19 - 04:36:19 1753
Paisley 04:21:17 -38.3 Dark Up 27.3 58.3 Low 04:06:17 - 04:36:17 1728
Tulelake 04:21:19 -37.9 Dark Up 26.3 57.5 Low 04:06:19 - 04:36:19 1716
Lakeview 04:21:18 -38.6 Dark Up 27.2 58.1 Low 04:06:18 - 04:36:18 1676
Fall River/Burney 04:21:22 -38.2 Dark Up 25.9 57.2 Low 04:06:22 - 04:36:22 1637
Cedarville 04:21:19 -38.9 Dark Up 26.9 57.9 Low 04:06:19 - 04:36:19 1613
Susanville 04:21:22 -38.9 Dark Up 26.0 57.3 Low 04:06:22 - 04:36:22 1546
Greenville 04:21:23 -38.7 Dark Up 25.7 57.0 Low 04:06:23 - 04:36:23 1539
Gimple 04:21:24 -38.8 Dark Up 25.8 57.0 Low 04:06:24 - 04:36:24 1534
Quincy 04:21:24 -38.8 Dark Up 25.6 56.9 Low 04:06:24 - 04:36:24 1522
Portola 04:21:24 -39.2 Dark Up 25.8 57.1 Low 04:06:24 - 04:36:24 1486
Reno 04:21:24 -39.7 Dark Up 26.1 57.3 Low 04:06:24 - 04:36:24 1429
Carson City 04:21:25 -39.8 Dark Up 25.9 57.1 Low 04:06:25 - 04:36:25 1398
Gardnerville 04:21:26 -39.9 Dark Up 25.8 57.0 Low 04:06:26 - 04:36:26 1375
Yerington 04:21:25 -40.4 Dark Up 26.3 57.3 Low 04:06:25 - 04:36:25 1348
Hawthorne 04:21:26 -40.9 Dark Up 26.4 57.3 Low 04:06:26 - 04:36:26 1280
Lee Vining 04:21:27 -40.6 Dark Up 25.7 56.9 Low 04:06:27 - 04:36:27 1258
Bishop 04:21:28 -41.4 Dark Up 25.9 57.0 Low 04:06:28 - 04:36:28 1168
Tonopah 04:21:25 -42.1 Dark Up 27.0 57.7 Low 04:06:25 - 04:36:25 1165
CPSLO 04:21:34 -40.0 Dark Up 23.2 55.3 Low 04:06:34 - 04:36:34 1118
Lone Pine 04:21:29 -41.8 Dark Up 25.7 56.8 Low 04:06:29 - 04:36:29 1085
Beatty 04:21:27 -42.7 Dark Up 26.7 57.4 Low 04:06:27 - 04:36:27 1041
Indian Springs 04:21:27 -43.6 Dark Up 27.3 57.7 Low 04:06:27 - 04:36:27 954
Wildwood 04:21:35 -41.9 Dark Up 23.9 55.6 Low 04:06:35 - 04:36:35 898
Henderson 04:21:26 -44.3 Dark Up 27.5 57.7 Low 04:06:26 - 04:36:26 870
Searchlight/Boulder City 04:21:27 -44.5 Dark Up 27.2 57.5 Low 04:06:27 - 04:36:27 816
Laughlin/Bullhead City 04:21:27 -44.9 Dark Up 27.3 57.5 Low 04:06:27 - 04:36:27 771
Niwot 04:21:02 -49.9 Dark Up 36.1 63.6 Up 04:06:02 - 04:36:02 762
Idyllwild 04:21:33 -43.5 Dark Up 25.0 56.2 Low 04:06:33 - 04:36:33 761
Patrick 04:21:26 -45.4 Dark Up 27.9 57.8 Low 04:06:26 - 04:36:26 755
Mohave Valley 04:21:28 -45.0 Dark Up 27.1 57.4 Low 04:06:28 - 04:36:28 747
Kingman/Dolan Springs 04:21:27 -45.3 Dark Up 27.7 57.7 Low 04:06:27 - 04:36:27 745
Lake Havasu City 04:21:29 -45.3 Dark Up 27.1 57.3 Low 04:06:29 - 04:36:29 698
DCO 04:21:26 -46.0 Dark Up 28.2 57.9 Low 04:06:26 - 04:36:26 690
Parker 04:21:29 -45.4 Dark Up 26.9 57.1 Low 04:06:29 - 04:36:29 665
Calipatria 04:21:33 -44.6 Dark Up 25.5 56.3 Low 04:06:33 - 04:36:33 642
Blythe 04:21:30 -45.3 Dark Up 26.4 56.8 Low 04:06:30 - 04:36:30 634
Yuma 04:21:32 -45.4 Dark Up 25.9 56.4 Low 04:06:32 - 04:36:32 554

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, (2020/11/02 04:17UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 24.96  13
3Iot Aur       04:56:59.6 +33:09:58  2.7  7.76  23
8Zet Aur       05:02:28.7 +41:04:33  3.8  0.40  29
PPM 047586     05:00:19.4 +40:19:52  8.1  0.57  28
PPM 047594     05:00:43.7 +40:52:49  9.5  0.04  29
181855         05:00:33.7 +40:53:52 14.9        29
Positions are for J2000

Event circumstances last updated at 2018/12/02 21:51:38 UT

Marc W. Buie, Southwest Research Institute

RECON