RECON: TNO occultation with 20YR3

Event between 20YR3 and star GA1220:02430792 with event index number of 2178991

Geocentric closest approach at 2021/10/14 06:49:32 UTC

J2000 position of star is 06:03:08.5 +32:15:12
Equinox of date position of star is 06:04:33.8 +32:15:05
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 145 degrees from the moon. Moon is 63% illuminated.
TNO apparent brightness V=22.0

[RECON map]
TNO is 17.5 AU from the Sun and 17.2 AU from the Earth.
The TNO is moving 20.5 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 47 seconds.
The 1-sigma cross-track error in the shadow position is 748 km.
The sky-plane scale is 12455.4 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=85.1 km assuming a 5% albedo -- 4.1 sec chord
Diameter=34.7 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 20YR3, (2021/10/14 06:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:38.8 +27:58:19  1.1 22.43 167
Alnath         05:27:40.3 +28:37:26  1.6  8.74 137
PPM 071108     06:02:34.5 +31:02:00  6.0  1.29 145
PPM 071139     06:04:03.3 +32:35:23  7.6  0.36 145
PPM 071150     06:04:46.4 +32:15:32 10.0  0.04 145
20YR3          06:04:33.8 +32:15:05 16.4       145
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 5.0 sigma about the mid-time.
The median site spacing is 22.9 km RECON observability=1.0 and success probability=0.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 06:53:29 -47.4 Dark Up 24.9 68.7 Low 06:49:04 - 06:57:55 4792
Clarence Fulton 06:53:21 -46.7 Dark Up 28.0 72.2 Low 06:48:55 - 06:57:46 4774
Peachland 06:53:23 -47.1 Dark Up 27.6 71.6 Low 06:48:57 - 06:57:48 4751
Kelowna 06:53:22 -47.1 Dark Up 27.8 71.9 Low 06:48:57 - 06:57:48 4749
Summerland 06:53:23 -47.3 Dark Up 27.6 71.6 Low 06:48:58 - 06:57:49 4736
Penticton 06:53:23 -47.4 Dark Up 27.6 71.7 Low 06:48:58 - 06:57:49 4726
Oliver 06:53:25 -47.7 Dark Up 27.5 71.5 Low 06:48:59 - 06:57:50 4698
Anarchist Mountain Observatory 06:53:25 -47.9 Dark Up 27.6 71.5 Low 06:48:59 - 06:57:50 4678
Tonasket 06:53:27 -48.2 Dark Up 27.5 71.4 Low 06:49:01 - 06:57:52 4655
Okanogan 06:53:27 -48.5 Dark Up 27.3 71.1 Low 06:49:02 - 06:57:53 4634
Brewster 06:53:29 -48.7 Dark Up 27.0 70.8 Low 06:49:04 - 06:57:55 4620
Manson/Chelan 06:53:29 -48.8 Dark Up 26.7 70.5 Low 06:49:04 - 06:57:55 4617
Wenatchee 06:53:32 -49.2 Dark Up 26.5 70.2 Low 06:49:06 - 06:57:57 4585
Ellensburg 06:53:33 -49.5 Dark Up 26.2 69.9 Low 06:49:07 - 06:57:58 4560
Yakima 06:53:34 -49.9 Dark Up 26.1 69.7 Low 06:49:09 - 06:58:00 4528
Toppenish/White Swan 06:53:35 -50.2 Dark Up 26.1 69.7 Low 06:49:09 - 06:58:00 4504
Goldendale 06:53:37 -50.6 Dark Up 25.6 69.2 Low 06:49:12 - 06:58:03 4476
The Dalles 06:53:38 -50.7 Dark Up 25.3 68.8 Low 06:49:12 - 06:58:03 4472
Pasco 06:53:34 -50.6 Dark Up 26.9 70.4 Low 06:49:09 - 06:58:00 4444
Maupin 06:53:39 -51.1 Dark Up 25.2 68.7 Low 06:49:14 - 06:58:05 4433
PNWRO 06:53:35 -50.9 Dark Up 26.9 70.4 Low 06:49:10 - 06:58:01 4415
Sisters 06:53:42 -51.8 Dark Up 24.6 68.1 Low 06:49:17 - 06:58:08 4381
Redmond 06:53:42 -51.9 Dark Up 24.8 68.3 Low 06:49:16 - 06:58:07 4363
Bend 06:53:43 -52.1 Dark Up 24.7 68.1 Low 06:49:17 - 06:58:08 4351
Oregon Observatory 06:53:44 -52.2 Dark Up 24.5 68.0 Low 06:49:18 - 06:58:09 4342
La Pine/Gilchrist 06:53:45 -52.4 Dark Up 24.4 67.9 Low 06:49:19 - 06:58:10 4327
North Lake 06:53:45 -52.9 Dark Up 24.7 68.0 Low 06:49:20 - 06:58:11 4266
Chiloquin 06:53:48 -53.3 Dark Up 23.8 67.2 Low 06:49:22 - 06:58:13 4249
Klamath Falls 06:53:49 -53.6 Dark Up 23.7 67.1 Low 06:49:23 - 06:58:14 4217
Paisley 06:53:46 -53.5 Dark Up 24.7 68.0 Low 06:49:21 - 06:58:12 4205
Lakeview 06:53:48 -54.1 Dark Up 24.6 67.9 Low 06:49:23 - 06:58:14 4154
Fall River/Burney 06:53:52 -54.8 Dark Up 23.5 66.9 Low 06:49:27 - 06:58:18 4101
Cedarville 06:53:50 -54.7 Dark Up 24.5 67.7 Low 06:49:24 - 06:58:15 4090
Susanville 06:53:53 -55.6 Dark Up 23.8 67.0 Low 06:49:28 - 06:58:19 4015
Greenville 06:53:54 -55.8 Dark Up 23.5 66.7 Low 06:49:29 - 06:58:20 4004
Gimple 06:53:54 -55.8 Dark Up 23.5 66.8 Low 06:49:29 - 06:58:20 4000
Quincy 06:53:55 -55.9 Dark Up 23.4 66.6 Low 06:49:30 - 06:58:21 3986
Portola 06:53:55 -56.2 Dark Up 23.7 66.8 Low 06:49:29 - 06:58:20 3955
Reno 06:53:55 -56.7 Dark Up 24.0 67.1 Low 06:49:30 - 06:58:21 3903
Carson City 06:53:56 -57.0 Dark Up 23.9 66.9 Low 06:49:31 - 06:58:22 3871
Gardnerville 06:53:57 -57.2 Dark Up 23.8 66.9 Low 06:49:31 - 06:58:22 3847
Yerington 06:53:56 -57.4 Dark Up 24.3 67.2 Low 06:49:31 - 06:58:22 3826
Hawthorne 06:53:57 -58.0 Dark Up 24.5 67.2 Low 06:49:31 - 06:58:22 3762
Lee Vining 06:53:59 -58.3 Dark Up 23.9 66.8 Low 06:49:33 - 06:58:24 3733
Tonopah 06:53:56 -58.8 Dark Up 25.3 67.7 Low 06:49:31 - 06:58:22 3659
Bishop 06:54:00 -59.1 Dark Up 24.2 66.9 Low 06:49:34 - 06:58:25 3648
CPSLO 06:54:07 -60.2 Dark Up 21.7 65.1 Low 06:49:41 - 06:58:32 3566
Beatty 06:53:59 -60.0 Dark Up 25.2 67.4 Low 06:49:34 - 06:58:25 3534
Indian Springs 06:53:59 -60.6 Dark Up 25.9 67.8 Low 06:49:33 - 06:58:24 3457
Henderson 06:53:59 -61.3 Dark Up 26.2 67.8 Low 06:49:34 - 06:58:25 3377
Dunrhomin 06:53:34 -58.0 Dark Down 34.8 74.7 Up 06:49:09 - 06:58:00 3376
Wildwood 06:54:08 -62.1 Dark Up 22.8 65.5 Low 06:49:42 - 06:58:33 3361
Laughlin/Bullhead City 06:54:01 -62.2 Dark Up 26.2 67.6 Low 06:49:35 - 06:58:26 3278
Patrick 06:53:59 -62.1 Dark Up 26.8 68.0 Low 06:49:34 - 06:58:25 3270
Kingman/Dolan Springs 06:53:59 -62.3 Dark Up 26.6 67.8 Low 06:49:34 - 06:58:25 3258
Mohave Valley 06:54:01 -62.5 Dark Up 26.1 67.5 Low 06:49:36 - 06:58:27 3253
Idyllwild 06:54:07 -63.0 Dark Up 24.0 66.1 Low 06:49:41 - 06:58:32 3242
Lake Havasu City 06:54:02 -62.9 Dark Up 26.1 67.4 Low 06:49:36 - 06:58:27 3204
Parker 06:54:02 -63.3 Dark Up 26.0 67.3 Low 06:49:37 - 06:58:28 3170
Blythe 06:54:04 -63.7 Dark Up 25.6 66.9 Low 06:49:38 - 06:58:29 3134
Calipatria 06:54:06 -63.9 Dark Up 24.7 66.3 Low 06:49:41 - 06:58:32 3131
Yuma 06:54:06 -64.6 Dark Up 25.2 66.5 Low 06:49:41 - 06:58:32 3049
George/Scottsdale 06:54:00 -64.1 Dark Up 27.7 68.0 Low 06:49:35 - 06:58:26 3023

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 20YR3, (2021/10/14 06:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 22.43 167
Alnath         05:26:17.6 +28:36:23  1.6  8.74 137
PPM 071108     06:01:10.0 +31:02:04  6.0  1.29 145
PPM 071139     06:02:37.7 +32:35:30  7.6  0.36 145
PPM 071150     06:03:21.0 +32:15:39 10.0  0.04 145
20YR3          06:03:08.5 +32:15:12 16.4       145
Positions are for J2000

Event circumstances last updated at 2021/10/10 00:59:18 UT

Marc W. Buie, Southwest Research Institute

RECON