RECON: TNO occultation with 91205

Event between (91205) 98US43 and star GA1040:01191626 with event index number of 1117925

Geocentric closest approach at 2021/12/05 09:31:31 UTC

J2000 position of star is 05:50:08.0 +15:53:56
Equinox of date position of star is 05:51:15.2 +15:54:12
Stellar brightness G=15.8, use SENSEUP=128
Star is 170 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=23.8

[RECON map]
TNO is 38.0 AU from the Sun and 37.0 AU from the Earth.
The TNO is moving 24.6 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 799 seconds.
The 1-sigma cross-track error in the shadow position is 2609 km.
The sky-plane scale is 26849.3 km/arcsec.

The TNO has an absolute magnitude Hv=8.0
Diameter=151.4 km assuming a 5% albedo -- 6.2 sec chord
Diameter=61.8 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 91205, (2021/12/05 09:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.6 +07:24:34  0.4  8.58 162
Bellatrix      05:26:18.5 +06:22:04  1.6 11.35 159
131 Tau        05:48:28.1 +14:29:41  5.7  1.58 169
PPM 121449     05:51:18.1 +16:01:05  8.3  0.12 170
91205          05:51:23.8 +15:54:14 15.8       170
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 1.1 sigma about the mid-time.
The median site spacing is 21.7 km RECON observability=1.0 and success probability=17.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 09:30:51 -55.9 Dark Down 55.0 197.3 Up 09:15:51 - 09:45:51 -448
Summerland 09:30:51 -56.3 Dark Down 55.3 196.9 Up 09:15:51 - 09:45:51 -475
Penticton 09:30:51 -56.3 Dark Down 55.4 197.2 Up 09:15:51 - 09:45:51 -482
Okanagan Falls 09:30:51 -56.4 Dark Down 55.6 197.2 Up 09:15:51 - 09:45:51 -499
Oliver 09:30:51 -56.5 Dark Down 55.7 197.3 Up 09:15:51 - 09:45:51 -515
Anarchist Mountain Observatory 09:30:50 -56.5 Dark Down 55.9 197.7 Up 09:15:50 - 09:45:50 -531
Oroville 09:30:50 -56.6 Dark Down 55.9 197.6 Up 09:15:50 - 09:45:50 -538
Tonasket 09:30:50 -56.8 Dark Down 56.2 197.7 Up 09:15:50 - 09:45:50 -560
Okanogan 09:30:51 -57.1 Dark Down 56.5 197.6 Up 09:15:51 - 09:45:51 -591
Brewster 09:30:51 -57.4 Dark Down 56.8 197.4 Up 09:15:51 - 09:45:51 -616
Manson/Chelan 09:30:52 -57.7 Dark Down 57.1 196.9 Up 09:15:52 - 09:45:52 -635
Entiat 09:30:53 -57.9 Dark Down 57.3 196.8 Up 09:15:53 - 09:45:53 -656
Wenatchee 09:30:53 -58.1 Dark Down 57.6 196.8 Up 09:15:53 - 09:45:53 -680
Ellensburg 09:30:53 -58.5 Dark Down 58.0 196.6 Up 09:15:53 - 09:45:53 -719
Yakima 09:30:53 -58.8 Dark Down 58.4 196.7 Up 09:15:53 - 09:45:53 -757
Toppenish/White Swan 09:30:53 -58.8 Dark Down 58.6 197.2 Up 09:15:53 - 09:45:53 -779
Pasco 09:30:49 -58.2 Dark Down 58.4 199.5 Up 09:15:49 - 09:45:49 -794
PNWRO 09:30:48 -58.3 Dark Down 58.6 200.0 Up 09:15:48 - 09:45:48 -818
George/Umatilla 09:30:49 -58.6 Dark Down 58.8 199.3 Up 09:15:49 - 09:45:49 -825
Goldendale 09:30:54 -59.4 Dark Down 59.2 196.7 Up 09:15:54 - 09:45:54 -831
The Dalles 09:30:55 -59.8 Dark Down 59.5 196.1 Up 09:15:55 - 09:45:55 -851
Maupin 09:30:55 -60.0 Dark Down 59.9 196.5 Up 09:15:55 - 09:45:55 -892
Madras/Culver 09:30:55 -60.4 Dark Down 60.4 196.7 Up 09:15:55 - 09:45:55 -946
Sisters 09:30:56 -60.8 Dark Down 60.8 196.0 Up 09:15:56 - 09:45:56 -977
Redmond 09:30:55 -60.6 Dark Down 60.7 196.8 Up 09:15:55 - 09:45:55 -981
Bend 09:30:55 -60.8 Dark Down 61.0 196.6 Up 09:15:55 - 09:45:55 -1001
Oregon Observatory 09:30:56 -61.0 Dark Down 61.2 196.4 Up 09:15:56 - 09:45:56 -1018
La Pine/Gilchrist 09:30:56 -61.2 Dark Down 61.4 196.4 Up 09:15:56 - 09:45:56 -1038
North Lake 09:30:54 -61.1 Dark Down 61.7 197.8 Up 09:15:54 - 09:45:54 -1083
Paisley 09:30:53 -61.2 Dark Down 62.1 198.9 Up 09:15:53 - 09:45:53 -1139
Chiloquin 09:30:57 -62.1 Dark Down 62.5 196.3 Up 09:15:57 - 09:45:57 -1147
Klamath Falls 09:30:56 -62.2 Dark Down 62.8 196.7 Up 09:15:56 - 09:45:56 -1181
Lakeview 09:30:52 -61.4 Dark Down 62.5 199.6 Up 09:15:52 - 09:45:52 -1190
Tulelake 09:30:56 -62.2 Dark Down 63.0 197.4 Up 09:15:56 - 09:45:56 -1209
Cedarville 09:30:51 -61.7 Dark Down 63.1 200.4 Up 09:15:51 - 09:45:51 -1256
Fall River/Burney 09:30:55 -62.7 Dark Down 63.9 198.2 Up 09:15:55 - 09:45:55 -1301
Susanville 09:30:53 -62.6 Dark Down 64.3 200.1 Up 09:15:53 - 09:45:53 -1367
Greenville 09:30:54 -63.0 Dark Down 64.6 199.7 Up 09:15:54 - 09:45:54 -1394
Gimple 09:30:53 -62.9 Dark Down 64.6 199.9 Up 09:15:53 - 09:45:53 -1395
Niwot 09:30:02 -52.2 Dark Down 57.9 228.0 Up 09:15:02 - 09:45:02 -1399
SwRI 09:30:02 -52.3 Dark Down 58.0 228.0 Up 09:15:02 - 09:45:02 -1410
Quincy 09:30:54 -63.1 Dark Down 64.8 199.9 Up 09:15:54 - 09:45:54 -1415
Portola 09:30:52 -62.9 Dark Down 64.8 201.0 Up 09:15:52 - 09:45:52 -1429
Reno 09:30:50 -62.6 Dark Down 64.9 202.6 Up 09:15:50 - 09:45:50 -1458
Carson City 09:30:49 -62.7 Dark Down 65.2 202.9 Up 09:15:49 - 09:45:49 -1495
Yerington 09:30:47 -62.4 Dark Down 65.2 204.5 Up 09:15:47 - 09:45:47 -1517
Gardnerville 09:30:49 -62.8 Dark Down 65.4 203.2 Up 09:15:49 - 09:45:49 -1520
Hawthorne 09:30:45 -62.3 Dark Down 65.4 206.0 Up 09:15:45 - 09:45:45 -1566
Tonopah 09:30:41 -61.5 Dark Down 65.3 209.5 Up 09:15:41 - 09:45:41 -1617
Lee Vining 09:30:47 -62.9 Dark Down 66.1 205.5 Up 09:15:47 - 09:45:47 -1623
Bishop 09:30:44 -62.6 Dark Down 66.4 207.7 Up 09:15:44 - 09:45:44 -1686
Beatty 09:30:39 -61.7 Dark Down 66.1 211.7 Up 09:15:39 - 09:45:39 -1738
Lone Pine 09:30:43 -62.7 Dark Down 66.9 209.3 Up 09:15:43 - 09:45:43 -1766
Indian Springs 09:30:35 -61.0 Dark Down 65.9 214.4 Up 09:15:35 - 09:45:35 -1773
Henderson 09:30:32 -60.7 Dark Down 66.1 216.5 Up 09:15:32 - 09:45:32 -1830
Searchlight/Boulder City 09:30:32 -60.8 Dark Down 66.5 217.4 Up 09:15:32 - 09:45:32 -1890
CPSLO 09:30:52 -65.1 Dark Down 69.0 204.6 Up 09:15:52 - 09:45:52 -1894
Patrick 09:30:28 -60.0 Dark Down 66.0 219.6 Up 09:15:28 - 09:45:28 -1896
Kingman/Dolan Springs 09:30:29 -60.2 Dark Down 66.3 219.5 Up 09:15:29 - 09:45:29 -1920
Laughlin/Bullhead City 09:30:31 -60.6 Dark Down 66.6 218.5 Up 09:15:31 - 09:45:31 -1922
DCO 09:30:26 -59.5 Dark Down 65.9 221.4 Up 09:15:26 - 09:45:26 -1929
Mohave Valley 09:30:30 -60.7 Dark Down 66.8 218.9 Up 09:15:30 - 09:45:30 -1950
Lake Havasu City 09:30:29 -60.6 Dark Down 66.9 220.0 Up 09:15:29 - 09:45:29 -1993
Wildwood 09:30:45 -64.1 Dark Down 69.3 211.2 Up 09:15:45 - 09:45:45 -2028
Parker 09:30:29 -60.7 Dark Down 67.2 220.6 Up 09:15:29 - 09:45:29 -2030
Idyllwild 09:30:38 -62.7 Dark Down 68.7 216.1 Up 09:15:38 - 09:45:38 -2070
Blythe 09:30:30 -61.1 Dark Down 67.8 220.8 Up 09:15:30 - 09:45:30 -2085
Calipatria 09:30:34 -61.9 Dark Down 68.6 219.7 Up 09:15:34 - 09:45:34 -2137
Yuma 09:30:30 -61.3 Dark Down 68.5 222.3 Up 09:15:30 - 09:45:30 -2184

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 91205, (2021/12/05 09:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.58 162
Bellatrix      05:25:07.8 +06:20:58  1.6 11.35 159
131 Tau        05:47:13.1 +14:29:18  5.7  1.58 169
PPM 121449     05:50:02.3 +16:00:47  8.3  0.12 170
91205          05:50:08.0 +15:53:56 15.8       170
Positions are for J2000

Event circumstances last updated at 2019/06/08 02:43:52 UT

Marc W. Buie, Southwest Research Institute

RECON