RECON: TNO occultation with 15BT518

Event between 15BT518 and star GA0820:04534129 with event index number of 1155509

Geocentric closest approach at 2021/05/22 04:05:54 UTC

J2000 position of star is 14:31:27.4 -07:06:36
Equinox of date position of star is 14:32:34.3 -07:12:09
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 36 degrees from the moon. Moon is 75% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 42.4 AU from the Sun and 41.5 AU from the Earth.
The TNO is moving 22.6 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 148 seconds.
The 1-sigma cross-track error in the shadow position is 1938 km.
The sky-plane scale is 30104.7 km/arcsec.

The TNO has an absolute magnitude Hv=5.9
Diameter=405.5 km assuming a 5% albedo -- 17.9 sec chord
Diameter=165.6 km assuming a 30% albedo -- 7.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 15BT518, (2021/05/22 04:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:19.4 -11:16:20  1.0 16.85  23
27Bet Lib      15:18:09.7 -09:27:38  2.6 11.50  48
107Mu Vir      14:44:11.4 -05:45:00  3.9  3.23  39
PPM 197610     14:31:16.3 -07:09:57  8.4  0.33  36
PPM 197633     14:32:21.9 -07:10:16  9.5  0.06  36
15BT518        14:32:35.4 -07:12:14 16.0        37
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 26.7 km RECON observability=0.2 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 04:08:30 -3.7 CT Up 25.1 141.0 Low 03:55:39 - 04:21:21 12931
Kelowna 04:08:31 -3.8 CT Up 25.4 140.7 Low 03:55:40 - 04:21:22 12900
Peachland 04:08:33 -3.7 CT Up 25.3 140.4 Low 03:55:42 - 04:21:24 12887
Summerland 04:08:33 -3.9 CT Up 25.5 140.5 Low 03:55:42 - 04:21:24 12877
Penticton 04:08:32 -4.0 CT Up 25.6 140.6 Low 03:55:41 - 04:21:23 12875
Oliver 04:08:33 -4.2 CT Up 25.8 140.5 Low 03:55:42 - 04:21:24 12849
Anarchist Mountain Observatory 04:08:33 -4.4 CT Up 26.1 140.6 Low 03:55:42 - 04:21:24 12840
Tonasket 04:08:33 -4.6 CT Up 26.3 140.4 Low 03:55:42 - 04:21:24 12816
Okanogan 04:08:34 -4.7 CT Up 26.5 140.2 Low 03:55:43 - 04:21:25 12788
Brewster 04:08:35 -4.8 CT Up 26.6 139.9 Low 03:55:44 - 04:21:26 12764
Manson/Chelan 04:08:36 -4.7 CT Up 26.6 139.5 Low 03:55:45 - 04:21:27 12741
Victoria 04:08:44 -2.6 CT Up 24.7 136.5 Low 03:55:53 - 04:21:35 12725
Wenatchee 04:08:35 -4.9 CT Up 26.9 139.1 Low 03:55:44 - 04:21:26 12701
Ellensburg 04:08:37 -5.0 CT Up 27.1 138.8 Low 03:55:46 - 04:21:28 12666
Pasco 04:08:34 -6.3 NT Up 28.3 139.9 Low 03:55:43 - 04:21:25 12637
Yakima 04:08:38 -5.3 CT Up 27.4 138.6 Low 03:55:47 - 04:21:29 12634
PNWRO 04:08:35 -6.5 NT Up 28.6 140.1 Low 03:55:44 - 04:21:26 12623
Toppenish/White Swan 04:08:39 -5.5 CT Up 27.6 138.7 Low 03:55:48 - 04:21:30 12621
Goldendale 04:08:40 -5.6 CT Up 27.8 138.1 Low 03:55:49 - 04:21:31 12569
The Dalles 04:08:42 -5.5 CT Up 27.8 137.7 Low 03:55:51 - 04:21:33 12544
Maupin 04:08:41 -5.8 CT Up 28.2 137.6 Low 03:55:50 - 04:21:32 12513
Dunrhomin 04:07:57 -17.7 AT Up 38.8 152.8 Up 03:55:06 - 04:20:48 12470
Redmond 04:08:42 -6.3 NT Up 28.8 137.2 Low 03:55:51 - 04:21:33 12439
Sisters 04:08:44 -6.1 NT Up 28.6 136.8 Low 03:55:53 - 04:21:35 12433
Bend 04:08:43 -6.4 NT Up 28.9 137.0 Low 03:55:52 - 04:21:34 12419
Oregon Observatory 04:08:43 -6.4 NT Up 29.0 136.8 Low 03:55:52 - 04:21:34 12403
La Pine/Gilchrist 04:08:44 -6.5 NT Up 29.1 136.7 Low 03:55:53 - 04:21:35 12385
North Lake 04:08:44 -7.1 NT Up 29.7 137.1 Low 03:55:53 - 04:21:35 12362
Paisley 04:08:43 -7.7 NT Up 30.3 137.2 Up 03:55:52 - 04:21:34 12325
Lakeview 04:08:43 -8.1 NT Up 30.8 137.2 Up 03:55:52 - 04:21:34 12287
Klamath Falls 04:08:48 -7.2 NT Up 30.0 135.8 Up 03:55:57 - 04:21:39 12259
Cedarville 04:08:43 -8.6 NT Up 31.3 137.1 Up 03:55:52 - 04:21:34 12237
Fall River/Burney 04:08:46 -8.1 NT Up 31.1 135.7 Up 03:55:55 - 04:21:37 12169
Susanville 04:08:45 -9.0 NT Up 31.9 136.2 Up 03:55:54 - 04:21:36 12133
Gimple 04:08:48 -9.0 NT Up 32.0 135.9 Up 03:55:57 - 04:21:39 12104
Greenville 04:08:47 -9.0 NT Up 32.0 135.8 Up 03:55:56 - 04:21:38 12102
Portola 04:08:46 -9.4 NT Up 32.4 136.1 Up 03:55:55 - 04:21:37 12085
Quincy 04:08:47 -9.1 NT Up 32.1 135.7 Up 03:55:56 - 04:21:38 12085
Reno 04:08:44 -10.0 NT Up 33.0 136.6 Up 03:55:53 - 04:21:35 12078
Carson City 04:08:43 -10.2 NT Up 33.2 136.5 Up 03:55:52 - 04:21:34 12047
Yerington 04:08:42 -10.7 NT Up 33.7 137.0 Up 03:55:51 - 04:21:33 12045
Gardnerville 04:08:45 -10.4 NT Up 33.5 136.4 Up 03:55:54 - 04:21:36 12027
Hawthorne 04:08:41 -11.3 NT Up 34.3 137.4 Up 03:55:50 - 04:21:32 12017
Tonopah 04:08:38 -12.5 AT Up 35.4 138.6 Up 03:55:47 - 04:21:29 12010
Lee Vining 04:08:43 -11.4 NT Up 34.5 136.6 Up 03:55:52 - 04:21:34 11957
Bishop 04:08:42 -12.2 AT Up 35.3 137.1 Up 03:55:51 - 04:21:33 11922
Beatty 04:08:37 -13.5 AT Up 36.5 138.5 Up 03:55:46 - 04:21:28 11920
Indian Springs 04:08:34 -14.4 AT Up 37.3 139.5 Up 03:55:43 - 04:21:25 11917
Henderson 04:08:32 -15.1 AT Up 38.1 139.9 Up 03:55:41 - 04:21:23 11887
Patrick 04:08:28 -16.2 AT Up 39.2 140.8 Up 03:55:37 - 04:21:19 11859
Kingman/Dolan Springs 04:08:29 -16.3 AT Up 39.2 140.5 Up 03:55:38 - 04:21:20 11835
Laughlin/Bullhead City 04:08:31 -16.0 AT Up 39.0 139.9 Up 03:55:40 - 04:21:22 11820
Mohave Valley 04:08:31 -16.1 AT Up 39.2 139.8 Up 03:55:40 - 04:21:22 11796
Lake Havasu City 04:08:31 -16.5 AT Up 39.6 139.8 Up 03:55:40 - 04:21:22 11766
George/Scottsdale 04:08:21 -18.6 Dark Up 41.5 142.1 Up 03:55:30 - 04:21:12 11758
Parker 04:08:31 -16.8 AT Up 39.9 139.7 Up 03:55:40 - 04:21:22 11735
CPSLO 04:08:50 -12.0 AT Up 35.5 133.8 Up 03:55:59 - 04:21:41 11685
Blythe 04:08:31 -16.9 AT Up 40.2 139.1 Up 03:55:40 - 04:21:22 11681
Idyllwild 04:08:38 -15.5 AT Up 38.9 136.9 Up 03:55:47 - 04:21:29 11640
Wildwood 04:08:45 -14.1 AT Up 37.6 135.2 Up 03:55:54 - 04:21:36 11626
Calipatria 04:08:34 -16.7 AT Up 40.0 137.8 Up 03:55:43 - 04:21:25 11613
Yuma 04:08:33 -17.5 AT Up 40.8 138.5 Up 03:55:42 - 04:21:24 11596

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 15BT518, (2021/05/22 04:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 16.85  23
27Bet Lib      15:17:00.3 -09:22:59  2.6 11.50  48
107Mu Vir      14:43:03.8 -05:39:36  3.9  3.23  39
PPM 197610     14:30:08.3 -07:04:18  8.4  0.33  36
PPM 197633     14:31:14.0 -07:04:38  9.5  0.06  36
15BT518        14:31:27.4 -07:06:36 16.0        36
Positions are for J2000

Event circumstances last updated at 2021/01/21 21:06:16 UT

Marc W. Buie, Southwest Research Institute

RECON