RECON: TNO occultation with 12HE85

Event between 12HE85 and star UC4-351-172961 with event index number of 210231

Geocentric closest approach at 2019/08/14 04:14:39 UTC

J2000 position of star is 19:14:36.8 -19:50:22
Equinox of date position of star is 19:15:40.1 -19:48:26
Stellar brightness R=16.0, use SENSEUP=128
Star is 19 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=25.8

[RECON map]
TNO is 40.3 AU from the Sun and 39.4 AU from the Earth.
The TNO is moving 19.5 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 1315 seconds.
The 1-sigma cross-track error in the shadow position is 4560 km.
The sky-plane scale is 28609.2 km/arcsec.

The TNO has an absolute magnitude Hv=9.7
Diameter=70.1 km assuming a 5% albedo -- 3.6 sec chord
Diameter=28.6 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is 9:5EEEE
 
 
 
 
 
 

Star training set for 12HE85, (2019/08/14 04:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.8 -26:28:26  0.9 38.38  57
Nunki          18:56:28.8 -26:16:14  2.0  7.84  24
PPM 235581     19:10:57.5 -19:46:16  6.4  1.13  20
PPM 235722     19:16:35.5 -19:45:06  8.1  0.20  19
PPM 235704     19:15:50.4 -19:52:41  9.6  0.08  19
12HE85         19:15:46.1 -19:48:15 16.0        19
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 0.7 sigma about the mid-time.
The median site spacing is 13.7 km RECON observability=0.4 and success probability=1.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:15:13 -9.2 CT Up 18.5 158.2 Really Low 04:00:13 - 04:30:13 6215
Tonasket 04:15:12 -9.3 CT Up 18.7 158.2 Really Low 04:00:12 - 04:30:12 6206
Okanogan 04:15:14 -9.4 CT Up 19.0 158.0 Really Low 04:00:14 - 04:30:14 6194
Brewster 04:15:16 -9.5 CT Up 19.2 157.8 Really Low 04:00:16 - 04:30:16 6184
Manson/Chelan 04:15:17 -9.4 CT Up 19.3 157.4 Really Low 04:00:17 - 04:30:17 6176
Entiat 04:15:18 -9.5 CT Up 19.5 157.3 Really Low 04:00:18 - 04:30:18 6167
Wenatchee 04:15:18 -9.6 CT Up 19.7 157.2 Really Low 04:00:18 - 04:30:18 6157
Ellensburg 04:15:20 -9.7 CT Up 20.0 156.9 Low 04:00:20 - 04:30:20 6141
Yakima 04:15:22 -9.9 CT Up 20.4 156.8 Low 04:00:22 - 04:30:22 6124
Toppenish/White Swan 04:15:21 -10.1 CT Up 20.6 157.0 Low 04:00:21 - 04:30:21 6115
Pasco 04:15:17 -10.9 CT Up 21.1 158.2 Low 04:00:17 - 04:30:17 6109
PNWRO 04:15:17 -11.2 CT Up 21.4 158.4 Low 04:00:17 - 04:30:17 6098
George/Umatilla 04:15:18 -11.0 CT Up 21.3 157.9 Low 04:00:18 - 04:30:18 6095
Goldendale 04:15:24 -10.2 CT Up 21.0 156.5 Low 04:00:24 - 04:30:24 6092
The Dalles 04:15:26 -10.1 CT Up 21.1 156.1 Low 04:00:26 - 04:30:26 6083
Maupin 04:15:26 -10.4 CT Up 21.5 156.2 Low 04:00:26 - 04:30:26 6065
Madras/Culver 04:15:28 -10.7 CT Up 22.0 156.0 Low 04:00:28 - 04:30:28 6041
Sisters 04:15:30 -10.6 CT Up 22.2 155.5 Low 04:00:30 - 04:30:30 6026
Redmond 04:15:28 -10.8 CT Up 22.3 155.9 Low 04:00:28 - 04:30:28 6025
Bend 04:15:29 -10.9 CT Up 22.5 155.8 Low 04:00:29 - 04:30:29 6015
Oregon Observatory 04:15:29 -10.9 CT Up 22.6 155.6 Low 04:00:29 - 04:30:29 6007
La Pine/Gilchrist 04:15:30 -11.0 CT Up 22.8 155.5 Low 04:00:30 - 04:30:30 5998
North Lake 04:15:29 -11.6 CT Up 23.4 156.0 Low 04:00:29 - 04:30:29 5977
Paisley 04:15:29 -12.1 AT Up 24.0 156.3 Low 04:00:29 - 04:30:29 5951
Chiloquin 04:15:34 -11.3 CT Up 23.7 155.0 Low 04:00:34 - 04:30:34 5945
Klamath Falls 04:15:34 -11.6 CT Up 24.0 155.0 Low 04:00:34 - 04:30:34 5929
Lakeview 04:15:29 -12.5 AT Up 24.5 156.4 Low 04:00:29 - 04:30:29 5926
Tulelake 04:15:34 -11.9 CT Up 24.4 155.2 Low 04:00:34 - 04:30:34 5915
Cedarville 04:15:29 -12.9 AT Up 25.1 156.4 Low 04:00:29 - 04:30:29 5893
Fall River/Burney 04:15:35 -12.4 AT Up 25.2 155.1 Low 04:00:35 - 04:30:35 5870
Susanville 04:15:33 -13.3 AT Up 26.0 155.7 Low 04:00:33 - 04:30:33 5837
Greenville 04:15:35 -13.2 AT Up 26.2 155.4 Low 04:00:35 - 04:30:35 5823
Gimple 04:15:36 -13.3 AT Up 26.2 155.5 Low 04:00:36 - 04:30:36 5822
Quincy 04:15:36 -13.3 AT Up 26.4 155.4 Low 04:00:36 - 04:30:36 5812
Portola 04:15:33 -13.7 AT Up 26.6 155.8 Low 04:00:33 - 04:30:33 5805
Reno 04:15:32 -14.3 AT Up 27.1 156.4 Low 04:00:32 - 04:30:32 5790
Carson City 04:15:33 -14.5 AT Up 27.4 156.3 Low 04:00:33 - 04:30:33 5771
Yerington 04:15:30 -15.0 AT Up 27.8 156.9 Low 04:00:30 - 04:30:30 5759
Gardnerville 04:15:33 -14.6 AT Up 27.6 156.3 Low 04:00:33 - 04:30:33 5757
Niwot 04:14:31 -22.5 Dark Up 29.6 171.5 Low 03:59:31 - 04:29:31 5743
Hawthorne 04:15:29 -15.6 AT Up 28.4 157.4 Low 04:00:29 - 04:30:29 5732
Tonopah 04:15:24 -16.7 AT Up 29.2 158.7 Low 04:00:24 - 04:30:24 5703
Lee Vining 04:15:32 -15.6 AT Up 28.7 156.8 Low 04:00:32 - 04:30:32 5702
Bishop 04:15:29 -16.4 AT Up 29.5 157.4 Low 04:00:29 - 04:30:29 5667
Beatty 04:15:24 -17.7 AT Up 30.4 158.9 Up 04:00:24 - 04:30:24 5636
Lone Pine 04:15:30 -17.0 AT Up 30.3 157.5 Up 04:00:30 - 04:30:30 5622
Indian Springs 04:15:20 -18.6 Dark Up 31.0 160.0 Up 04:00:20 - 04:30:20 5613
Henderson 04:15:18 -19.4 Dark Up 31.7 160.6 Up 04:00:18 - 04:30:18 5579
CPSLO 04:15:43 -16.0 AT Up 30.7 154.6 Up 04:00:43 - 04:30:43 5549
Searchlight/Boulder City 04:15:18 -19.7 Dark Up 32.3 160.5 Up 04:00:18 - 04:30:18 5544
Patrick 04:15:14 -20.4 Dark Up 32.6 161.6 Up 04:00:14 - 04:30:14 5536
Laughlin/Bullhead City 04:15:17 -20.1 Dark Up 32.6 160.8 Up 04:00:17 - 04:30:17 5524
Kingman/Dolan Springs 04:15:14 -20.5 Dark Up 32.8 161.4 Up 04:00:14 - 04:30:14 5523
DCO 04:15:11 -21.1 Dark Up 33.1 162.3 Up 04:00:11 - 04:30:11 5514
Mohave Valley 04:15:17 -20.3 Dark Up 32.9 160.8 Up 04:00:17 - 04:30:17 5507
Lake Havasu City 04:15:17 -20.7 Dark Up 33.4 161.0 Up 04:00:17 - 04:30:17 5482
Wildwood 04:15:37 -18.0 Dark Up 32.5 156.4 Up 04:00:37 - 04:30:37 5472
Parker 04:15:17 -20.9 Dark Up 33.7 160.9 Up 04:00:17 - 04:30:17 5460
Idyllwild 04:15:28 -19.5 Dark Up 33.4 158.3 Up 04:00:28 - 04:30:28 5444
Blythe 04:15:19 -21.0 Dark Up 34.1 160.5 Up 04:00:19 - 04:30:19 5428
Calipatria 04:15:24 -20.7 Dark Up 34.3 159.4 Up 04:00:24 - 04:30:24 5401
Yuma 04:15:20 -21.5 Dark Up 35.0 160.2 Up 04:00:20 - 04:30:20 5369

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 12HE85, (2019/08/14 04:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 38.38  57
Nunki          18:55:15.9 -26:17:49  2.0  7.84  24
PPM 235581     19:09:48.2 -19:48:15  6.4  1.13  20
PPM 235722     19:15:26.3 -19:47:14  8.1  0.20  19
PPM 235704     19:14:41.0 -19:54:48  9.6  0.08  19
12HE85         19:14:36.8 -19:50:22 16.0        19
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:11:59 UT

Marc W. Buie, Southwest Research Institute

RECON