RECON: TNO occultation with 52975

Event between (52975) Cyllarus and star UC4-616-041487 with event index number of 106230

Geocentric closest approach at 2018/02/27 03:06:56 UTC

J2000 position of star is 07:36:17.6 +33:00:44
Equinox of date position of star is 07:37:25.6 +32:58:20
Stellar brightness R=15.7, use SENSEUP=128
Star is 15 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=23.9

[RECON map]
TNO is 27.5 AU from the Sun and 26.9 AU from the Earth.
The TNO is moving 15.8 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 1616 seconds.
The 1-sigma cross-track error in the shadow position is 1682 km.
The sky-plane scale is 19500.1 km/arcsec.

The TNO has an absolute magnitude Hv=9.4
Diameter=79.4 km assuming a 5% albedo -- 5.0 sec chord
Diameter=32.4 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 52975, (2018/02/27 03:07UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:25.5 +27:58:51  1.1  5.35  10
PPM 073009     07:41:03.6 +31:58:00  6.4  1.26  14
PPM 072932     07:35:35.1 +33:04:53  8.1  0.41  16
PPM 072966     07:37:46.2 +33:09:40 11.1  0.20  15
52975          07:37:27.8 +32:58:15 15.7        15
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 0.6 sigma about the mid-time.
The median site spacing is 26.3 km RECON observability=0.9 and success probability=29.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 03:08:58 -15.9 AT Up 63.0 115.2 Up 02:53:58 - 03:23:58 753
Tonasket 03:08:59 -15.9 AT Up 63.1 114.8 Up 02:53:59 - 03:23:59 730
Okanogan 03:09:00 -15.9 AT Up 63.1 114.0 Up 02:54:00 - 03:24:00 700
Brewster 03:09:02 -15.8 AT Up 63.1 113.2 Up 02:54:02 - 03:24:02 678
Manson/Chelan 03:09:04 -15.5 AT Up 63.0 112.4 Up 02:54:04 - 03:24:04 667
Entiat 03:09:05 -15.5 AT Up 63.0 111.9 Up 02:54:05 - 03:24:05 647
Wenatchee 03:09:06 -15.5 AT Up 63.1 111.3 Up 02:54:06 - 03:24:06 624
Ellensburg 03:09:09 -15.4 AT Up 63.1 110.3 Up 02:54:09 - 03:24:09 589
Yakima 03:09:10 -15.4 AT Up 63.2 109.5 Up 02:54:10 - 03:24:10 549
Toppenish/White Swan 03:09:10 -15.5 AT Up 63.4 109.3 Up 02:54:10 - 03:24:10 523
Pasco 03:09:05 -16.4 AT Up 64.2 110.6 Up 02:54:05 - 03:24:05 479
Goldendale 03:09:13 -15.3 AT Up 63.3 107.8 Up 02:54:13 - 03:24:13 479
The Dalles 03:09:15 -15.0 AT Up 63.1 107.0 Up 02:54:15 - 03:24:15 466
George/Umatilla 03:09:07 -16.3 AT Up 64.2 109.7 Up 02:54:07 - 03:24:07 451
PNWRO 03:09:05 -16.6 AT Up 64.5 110.4 Up 02:54:05 - 03:24:05 449
Maupin 03:09:16 -15.1 AT Up 63.3 106.3 Up 02:54:16 - 03:24:16 421
Madras/Culver 03:09:18 -15.1 AT Up 63.4 105.2 Up 02:54:18 - 03:24:18 368
Sisters 03:09:21 -14.8 AT Up 63.2 104.1 Up 02:54:21 - 03:24:21 347
Redmond 03:09:19 -15.1 AT Up 63.5 104.5 Up 02:54:19 - 03:24:19 334
Bend 03:09:20 -15.0 AT Up 63.5 103.9 Up 02:54:20 - 03:24:20 316
Oregon Observatory 03:09:21 -15.0 AT Up 63.4 103.5 Up 02:54:21 - 03:24:21 302
La Pine/Gilchrist 03:09:22 -14.9 AT Up 63.4 103.0 Up 02:54:22 - 03:24:22 283
North Lake 03:09:21 -15.4 AT Up 63.9 102.8 Up 02:54:21 - 03:24:21 223
Chiloquin 03:09:26 -14.7 AT Up 63.4 100.5 Up 02:54:26 - 03:24:26 181
Paisley 03:09:21 -15.7 AT Up 64.3 102.0 Up 02:54:21 - 03:24:21 158
Klamath Falls 03:09:27 -14.8 AT Up 63.5 99.9 Up 02:54:27 - 03:24:27 144
Tulelake 03:09:26 -15.0 AT Up 63.8 99.6 Up 02:54:26 - 03:24:26 109
Lakeview 03:09:21 -15.8 AT Up 64.6 101.2 Up 02:54:21 - 03:24:21 101
Cedarville 03:09:22 -16.0 AT Up 64.8 100.0 Up 02:54:22 - 03:24:22 30
Fall River/Burney 03:09:28 -15.1 AT Up 64.0 97.9 Up 02:54:28 - 03:24:28 15
Susanville 03:09:27 -15.7 AT Up 64.6 97.2 Up 02:54:27 - 03:24:27 -72
Greenville 03:09:29 -15.5 AT Up 64.4 96.4 Up 02:54:29 - 03:24:29 -92
Gimple 03:09:28 -15.6 AT Up 64.5 96.5 Up 02:54:28 - 03:24:28 -94
Quincy 03:09:30 -15.5 AT Up 64.5 96.0 Up 02:54:30 - 03:24:30 -112
Portola 03:09:28 -15.9 AT Up 64.8 96.1 Up 02:54:28 - 03:24:28 -138
Reno 03:09:25 -16.4 AT Up 65.4 96.1 Up 02:54:25 - 03:24:25 -184
Carson City 03:09:26 -16.4 AT Up 65.4 95.3 Up 02:54:26 - 03:24:26 -222
Gardnerville 03:09:27 -16.5 AT Up 65.5 94.8 Up 02:54:27 - 03:24:27 -248
Yerington 03:09:24 -16.9 AT Up 65.9 95.4 Up 02:54:24 - 03:24:24 -259
Hawthorne 03:09:23 -17.3 AT Up 66.4 94.7 Up 02:54:23 - 03:24:23 -322
Lee Vining 03:09:26 -17.0 AT Up 66.0 93.1 Up 02:54:26 - 03:24:26 -367
Tonopah 03:09:18 -18.5 Dark Up 67.5 94.7 Up 02:54:18 - 03:24:18 -409
Bishop 03:09:24 -17.6 AT Up 66.6 92.2 Up 02:54:24 - 03:24:24 -449
Niwot 03:08:14 -27.2 Dark Up 75.9 115.3 Up 02:53:14 - 03:23:14 -457
Lone Pine 03:09:24 -17.9 AT Up 66.9 90.7 Up 02:54:24 - 03:24:24 -538
Beatty 03:09:18 -18.9 Dark Up 67.9 92.2 Up 02:54:18 - 03:24:18 -542
CPSLO 03:09:40 -15.9 AT Up 64.8 86.4 Up 02:54:40 - 03:24:40 -598
Indian Springs 03:09:13 -19.8 Dark Up 68.8 92.1 Up 02:54:13 - 03:24:13 -605
Henderson 03:09:11 -20.4 Dark Up 69.4 91.2 Up 02:54:11 - 03:24:11 -679
Searchlight/Boulder City 03:09:12 -20.5 Dark Up 69.4 89.7 Up 02:54:12 - 03:24:12 -741
Patrick 03:09:07 -21.3 Dark Up 70.3 90.1 Up 02:54:07 - 03:24:07 -774
Laughlin/Bullhead City 03:09:11 -20.8 Dark Up 69.7 89.1 Up 02:54:11 - 03:24:11 -782
Wildwood 03:09:33 -17.6 AT Up 66.4 84.6 Up 02:54:33 - 03:24:33 -785
Kingman/Dolan Springs 03:09:08 -21.2 Dark Up 70.1 89.4 Up 02:54:08 - 03:24:08 -793
Mohave Valley 03:09:11 -20.8 Dark Up 69.7 88.3 Up 02:54:11 - 03:24:11 -811
DCO 03:09:04 -21.9 Dark Up 70.8 89.7 Up 02:54:04 - 03:24:04 -824
Lake Havasu City 03:09:11 -21.0 Dark Up 69.9 87.4 Up 02:54:11 - 03:24:11 -860
Idyllwild 03:09:24 -19.1 Dark Up 67.9 84.4 Up 02:54:24 - 03:24:24 -876
Parker 03:09:12 -21.1 Dark Up 69.9 86.4 Up 02:54:12 - 03:24:12 -898
Blythe 03:09:14 -20.9 Dark Up 69.6 84.9 Up 02:54:14 - 03:24:14 -946
Calipatria 03:09:20 -20.1 Dark Up 68.8 83.3 Up 02:54:20 - 03:24:20 -973
Yuma 03:09:16 -20.9 Dark Up 69.5 82.4 Up 02:54:16 - 03:24:16 -1043

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 52975, (2018/02/27 03:07UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1  5.35  10
PPM 073009     07:39:54.0 +32:00:34  6.4  1.26  14
PPM 072932     07:34:24.7 +33:07:19  8.1  0.41  16
PPM 072966     07:36:35.9 +33:12:10 11.1  0.20  15
52975          07:36:17.6 +33:00:44 15.7        15
Positions are for J2000

Event circumstances last updated at 2017/07/31 16:27:34 UT

Marc W. Buie, Southwest Research Institute

RECON