RECON: TNO occultation with 181868

Event between (181868) 99CG119 and star GA0900:03665672 with event index number of 2352830

Geocentric closest approach at 2022/01/13 08:03:01 UTC

J2000 position of star is 10:23:24.7 +00:06:46
Equinox of date position of star is 10:24:32.1 +00:00:05
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 95 degrees from the moon. Moon is 82% illuminated.
TNO apparent brightness V=23.3

[RECON map]
TNO is 37.3 AU from the Sun and 36.6 AU from the Earth.
The TNO is moving 16.9 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 379 seconds.
The 1-sigma cross-track error in the shadow position is 4663 km.
The sky-plane scale is 26568.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.5
Diameter=191.4 km assuming a 5% albedo -- 11.3 sec chord
Diameter=78.2 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 181868, (2022/01/13 08:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:32.6 +11:51:31  1.3 12.43  87
30Bet Sex      10:31:25.0 -00:45:03  4.8  1.88  97
PPM 178158     10:22:29.9 -00:19:55  7.9  0.61  95
PPM 156793     10:25:19.9 +00:05:51  9.8  0.22  95
181868         10:24:32.4 +00:00:03 15.2        95
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 2.4 sigma about the mid-time.
The median site spacing is 23.2 km RECON observability=1.0 and success probability=6.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:05:17 -57.7 Dark Up 33.1 146.4 Up 07:50:17 - 08:20:17 7091
Kamloops 08:06:08 -60.8 Dark Up 28.2 130.7 Low 07:51:08 - 08:21:08 6911
Kelowna 08:06:08 -61.6 Dark Up 29.2 131.3 Low 07:51:08 - 08:21:08 6854
Peachland 08:06:09 -61.7 Dark Up 29.1 130.9 Low 07:51:09 - 08:21:09 6844
Summerland 08:06:09 -61.9 Dark Up 29.3 131.0 Low 07:51:09 - 08:21:09 6833
Penticton 08:06:09 -61.9 Dark Up 29.4 131.0 Low 07:51:09 - 08:21:09 6828
Oliver 08:06:10 -62.3 Dark Up 29.6 130.9 Low 07:51:10 - 08:21:10 6801
Anarchist Mountain Observatory 08:06:09 -62.5 Dark Up 29.8 131.0 Low 07:51:09 - 08:21:09 6789
Tonasket 08:06:10 -62.8 Dark Up 30.0 130.8 Low 07:51:10 - 08:21:10 6764
Okanogan 08:06:12 -63.1 Dark Up 30.1 130.5 Up 07:51:12 - 08:21:12 6737
Victoria 08:06:24 -62.8 Dark Up 28.1 126.9 Low 07:51:24 - 08:21:24 6730
Brewster 08:06:14 -63.4 Dark Up 30.2 130.2 Up 07:51:14 - 08:21:14 6714
Manson/Chelan 08:06:15 -63.6 Dark Up 30.2 129.8 Up 07:51:15 - 08:21:15 6696
Wenatchee 08:06:18 -64.0 Dark Up 30.4 129.4 Up 07:51:18 - 08:21:18 6657
Ellensburg 08:06:20 -64.4 Dark Up 30.5 129.0 Up 07:51:20 - 08:21:20 6623
Yakima 08:06:20 -64.9 Dark Up 30.8 128.8 Up 07:51:20 - 08:21:20 6590
Toppenish/White Swan 08:06:19 -65.1 Dark Up 31.0 128.8 Up 07:51:19 - 08:21:19 6573
Pasco 08:06:16 -65.2 Dark Up 31.8 130.0 Up 07:51:16 - 08:21:16 6570
PNWRO 08:06:16 -65.5 Dark Up 32.0 130.2 Up 07:51:16 - 08:21:16 6551
Goldendale 08:06:23 -65.6 Dark Up 31.1 128.2 Up 07:51:23 - 08:21:23 6526
The Dalles 08:06:25 -65.8 Dark Up 31.1 127.7 Up 07:51:25 - 08:21:25 6505
Maupin 08:06:26 -66.2 Dark Up 31.4 127.6 Up 07:51:26 - 08:21:26 6472
Redmond 08:06:29 -67.1 Dark Up 31.9 127.1 Up 07:51:29 - 08:21:29 6396
Sisters 08:06:29 -67.1 Dark Up 31.6 126.7 Up 07:51:29 - 08:21:29 6396
Bend 08:06:30 -67.4 Dark Up 31.9 126.9 Up 07:51:30 - 08:21:30 6377
Oregon Observatory 08:06:30 -67.5 Dark Up 32.0 126.7 Up 07:51:30 - 08:21:30 6362
La Pine/Gilchrist 08:06:32 -67.7 Dark Up 32.1 126.5 Up 07:51:32 - 08:21:32 6344
North Lake 08:06:30 -68.2 Dark Up 32.7 126.9 Up 07:51:30 - 08:21:30 6311
Paisley 08:06:30 -68.7 Dark Up 33.2 126.9 Up 07:51:30 - 08:21:30 6265
Chiloquin 08:06:35 -68.8 Dark Up 32.5 125.6 Up 07:51:35 - 08:21:35 6247
Lakeview 08:06:32 -69.3 Dark Up 33.6 126.8 Up 07:51:32 - 08:21:32 6223
Klamath Falls 08:06:35 -69.1 Dark Up 32.8 125.5 Up 07:51:35 - 08:21:35 6218
Cedarville 08:06:32 -69.9 Dark Up 34.1 126.7 Up 07:51:32 - 08:21:32 6167
Dunrhomin 08:05:34 -67.7 Dark Up 43.0 141.9 Up 07:50:34 - 08:20:34 6151
Fall River/Burney 08:06:37 -70.3 Dark Up 33.7 125.3 Up 07:51:37 - 08:21:37 6117
Susanville 08:06:37 -71.0 Dark Up 34.5 125.6 Up 07:51:37 - 08:21:37 6066
Gimple 08:06:37 -71.3 Dark Up 34.5 125.3 Up 07:51:37 - 08:21:37 6040
Greenville 08:06:38 -71.3 Dark Up 34.5 125.2 Up 07:51:38 - 08:21:38 6039
Quincy 08:06:38 -71.5 Dark Up 34.6 125.1 Up 07:51:38 - 08:21:38 6021
Portola 08:06:37 -71.6 Dark Up 35.0 125.4 Up 07:51:37 - 08:21:37 6013
Reno 08:06:35 -71.9 Dark Up 35.5 125.9 Up 07:51:35 - 08:21:35 5993
Carson City 08:06:36 -72.3 Dark Up 35.8 125.7 Up 07:51:36 - 08:21:36 5961
Yerington 08:06:34 -72.5 Dark Up 36.3 126.2 Up 07:51:34 - 08:21:34 5947
Gardnerville 08:06:36 -72.5 Dark Up 35.9 125.6 Up 07:51:36 - 08:21:36 5939
Hawthorne 08:06:33 -72.9 Dark Up 36.9 126.4 Up 07:51:33 - 08:21:33 5908
Tonopah 08:06:29 -73.3 Dark Up 38.0 127.5 Up 07:51:29 - 08:21:29 5875
Lee Vining 08:06:35 -73.5 Dark Up 36.9 125.6 Up 07:51:35 - 08:21:35 5854
Bishop 08:06:34 -74.1 Dark Up 37.7 126.0 Up 07:51:34 - 08:21:34 5804
Beatty 08:06:29 -74.4 Dark Up 39.0 127.3 Up 07:51:29 - 08:21:29 5771
Indian Springs 08:06:25 -74.5 Dark Up 39.9 128.1 Up 07:51:25 - 08:21:25 5748
Henderson 08:06:23 -74.9 Dark Up 40.7 128.4 Up 07:51:23 - 08:21:23 5703
Patrick 08:06:19 -75.2 Dark Up 41.8 129.2 Up 07:51:19 - 08:21:19 5652
Kingman/Dolan Springs 08:06:20 -75.5 Dark Up 41.8 128.8 Up 07:51:20 - 08:21:20 5630
Laughlin/Bullhead City 08:06:23 -75.6 Dark Up 41.5 128.3 Up 07:51:23 - 08:21:23 5624
Mohave Valley 08:06:23 -75.9 Dark Up 41.6 128.1 Up 07:51:23 - 08:21:23 5598
CPSLO 08:06:48 -76.1 Dark Up 37.4 122.6 Up 07:51:48 - 08:21:48 5598
Lake Havasu City 08:06:22 -76.2 Dark Up 42.0 128.1 Up 07:51:22 - 08:21:22 5562
Parker 08:06:23 -76.5 Dark Up 42.3 127.8 Up 07:51:23 - 08:21:23 5529
George/Scottsdale 08:06:13 -76.0 Dark Up 44.1 130.0 Up 07:51:13 - 08:21:13 5506
Wildwood 08:06:42 -77.3 Dark Up 39.5 123.7 Up 07:51:42 - 08:21:42 5496
Blythe 08:06:25 -77.1 Dark Up 42.4 127.2 Up 07:51:25 - 08:21:25 5477
Idyllwild 08:06:34 -77.5 Dark Up 40.9 125.2 Up 07:51:34 - 08:21:34 5475
Calipatria 08:06:30 -77.8 Dark Up 42.1 125.9 Up 07:51:30 - 08:21:30 5424
Yuma 08:06:27 -78.0 Dark Up 42.9 126.4 Up 07:51:27 - 08:21:27 5389

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 181868, (2022/01/13 08:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 12.43  87
30Bet Sex      10:30:17.4 -00:38:14  4.8  1.88  97
PPM 178158     10:21:22.2 -00:13:13  7.9  0.61  95
PPM 156793     10:24:12.1 +00:12:35  9.8  0.22  95
181868         10:23:24.7 +00:06:46 15.2        95
Positions are for J2000

Event circumstances last updated at 2021/12/05 02:01:54 UT

Marc W. Buie, Southwest Research Institute

RECON