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 04:13:45 UTC

J2000 position of star is 19:14:36.8 -19:50:22
Equinox of date position of star is 19:15:39.2 -19:48:28
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 4563 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 04:14UT)
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 13.5 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 04:14:18 -9.1 CT Up 18.4 158.0 Really Low 03:59:18 - 04:29:18 6219
Tonasket 04:14:19 -9.2 CT Up 18.7 158.0 Really Low 03:59:19 - 04:29:19 6211
Okanogan 04:14:20 -9.3 CT Up 18.9 157.8 Really Low 03:59:20 - 04:29:20 6198
Brewster 04:14:22 -9.4 CT Up 19.1 157.6 Really Low 03:59:22 - 04:29:22 6188
Manson/Chelan 04:14:23 -9.3 CT Up 19.2 157.2 Really Low 03:59:23 - 04:29:23 6180
Entiat 04:14:24 -9.4 CT Up 19.4 157.1 Really Low 03:59:24 - 04:29:24 6172
Wenatchee 04:14:25 -9.5 CT Up 19.6 157.0 Really Low 03:59:25 - 04:29:25 6162
Ellensburg 04:14:26 -9.6 CT Up 19.9 156.7 Really Low 03:59:26 - 04:29:26 6146
Yakima 04:14:27 -9.8 CT Up 20.3 156.6 Low 03:59:27 - 04:29:27 6129
Toppenish/White Swan 04:14:26 -10.0 CT Up 20.6 156.8 Low 03:59:26 - 04:29:26 6120
Pasco 04:14:23 -10.8 CT Up 21.0 158.0 Low 03:59:23 - 04:29:23 6113
PNWRO 04:14:22 -11.0 CT Up 21.3 158.1 Low 03:59:22 - 04:29:22 6103
George/Umatilla 04:14:24 -10.8 CT Up 21.3 157.7 Low 03:59:24 - 04:29:24 6099
Goldendale 04:14:29 -10.1 CT Up 21.0 156.3 Low 03:59:29 - 04:29:29 6097
The Dalles 04:14:31 -10.0 CT Up 21.1 155.9 Low 03:59:31 - 04:29:31 6088
Maupin 04:14:31 -10.3 CT Up 21.5 155.9 Low 03:59:31 - 04:29:31 6070
Madras/Culver 04:14:33 -10.5 CT Up 22.0 155.8 Low 03:59:33 - 04:29:33 6046
Sisters 04:14:35 -10.4 CT Up 22.1 155.3 Low 03:59:35 - 04:29:35 6031
Redmond 04:14:34 -10.7 CT Up 22.3 155.7 Low 03:59:34 - 04:29:34 6030
Bend 04:14:35 -10.7 CT Up 22.4 155.5 Low 03:59:35 - 04:29:35 6020
Oregon Observatory 04:14:35 -10.7 CT Up 22.5 155.4 Low 03:59:35 - 04:29:35 6013
La Pine/Gilchrist 04:14:36 -10.8 CT Up 22.7 155.3 Low 03:59:36 - 04:29:36 6003
North Lake 04:14:35 -11.4 CT Up 23.3 155.8 Low 03:59:35 - 04:29:35 5983
Paisley 04:14:35 -11.9 CT Up 23.9 156.0 Low 03:59:35 - 04:29:35 5956
Chiloquin 04:14:40 -11.2 CT Up 23.6 154.8 Low 03:59:40 - 04:29:40 5951
Klamath Falls 04:14:40 -11.4 CT Up 24.0 154.8 Low 03:59:40 - 04:29:40 5934
Lakeview 04:14:35 -12.3 AT Up 24.4 156.1 Low 03:59:35 - 04:29:35 5931
Tulelake 04:14:39 -11.8 CT Up 24.3 155.0 Low 03:59:39 - 04:29:39 5921
Cedarville 04:14:36 -12.8 AT Up 25.1 156.2 Low 03:59:36 - 04:29:36 5899
Fall River/Burney 04:14:41 -12.3 AT Up 25.1 154.9 Low 03:59:41 - 04:29:41 5875
Susanville 04:14:39 -13.1 AT Up 25.9 155.5 Low 03:59:39 - 04:29:39 5842
Greenville 04:14:41 -13.1 AT Up 26.1 155.2 Low 03:59:41 - 04:29:41 5828
Gimple 04:14:41 -13.1 AT Up 26.1 155.3 Low 03:59:41 - 04:29:41 5828
Quincy 04:14:41 -13.2 AT Up 26.3 155.1 Low 03:59:41 - 04:29:41 5817
Portola 04:14:40 -13.6 AT Up 26.6 155.6 Low 03:59:40 - 04:29:40 5810
Reno 04:14:38 -14.1 AT Up 27.0 156.2 Low 03:59:38 - 04:29:38 5795
Carson City 04:14:38 -14.3 AT Up 27.3 156.1 Low 03:59:38 - 04:29:38 5776
Yerington 04:14:35 -14.8 AT Up 27.7 156.7 Low 03:59:35 - 04:29:35 5764
Gardnerville 04:14:38 -14.5 AT Up 27.6 156.1 Low 03:59:38 - 04:29:38 5763
Niwot 04:13:36 -22.4 Dark Up 29.6 171.2 Low 03:58:36 - 04:28:36 5749
Hawthorne 04:14:35 -15.4 AT Up 28.3 157.1 Low 03:59:35 - 04:29:35 5738
Tonopah 04:14:30 -16.6 AT Up 29.1 158.5 Low 03:59:30 - 04:29:30 5709
Lee Vining 04:14:38 -15.4 AT Up 28.7 156.5 Low 03:59:38 - 04:29:38 5708
Bishop 04:14:35 -16.2 AT Up 29.4 157.1 Low 03:59:35 - 04:29:35 5672
Beatty 04:14:29 -17.6 AT Up 30.4 158.7 Up 03:59:29 - 04:29:29 5641
Lone Pine 04:14:36 -16.9 AT Up 30.2 157.3 Up 03:59:36 - 04:29:36 5627
Indian Springs 04:14:25 -18.4 Dark Up 31.0 159.7 Up 03:59:25 - 04:29:25 5618
Henderson 04:14:23 -19.2 Dark Up 31.7 160.3 Up 03:59:23 - 04:29:23 5583
CPSLO 04:14:49 -15.8 AT Up 30.6 154.4 Up 03:59:49 - 04:29:49 5554
Searchlight/Boulder City 04:14:24 -19.6 Dark Up 32.2 160.3 Up 03:59:24 - 04:29:24 5549
Patrick 04:14:19 -20.3 Dark Up 32.5 161.4 Up 03:59:19 - 04:29:19 5541
Laughlin/Bullhead City 04:14:22 -20.0 Dark Up 32.6 160.6 Up 03:59:22 - 04:29:22 5528
Kingman/Dolan Springs 04:14:21 -20.3 Dark Up 32.7 161.1 Up 03:59:21 - 04:29:21 5528
DCO 04:14:17 -20.9 Dark Up 33.0 162.1 Up 03:59:17 - 04:29:17 5519
Mohave Valley 04:14:24 -20.1 Dark Up 32.8 160.5 Up 03:59:24 - 04:29:24 5512
Lake Havasu City 04:14:23 -20.5 Dark Up 33.3 160.7 Up 03:59:23 - 04:29:23 5486
Wildwood 04:14:42 -17.9 AT Up 32.4 156.2 Up 03:59:42 - 04:29:42 5476
Parker 04:14:23 -20.8 Dark Up 33.6 160.7 Up 03:59:23 - 04:29:23 5464
Idyllwild 04:14:34 -19.4 Dark Up 33.3 158.0 Up 03:59:34 - 04:29:34 5449
Blythe 04:14:25 -20.9 Dark Up 34.0 160.2 Up 03:59:25 - 04:29:25 5432
Calipatria 04:14:30 -20.5 Dark Up 34.2 159.1 Up 03:59:30 - 04:29:30 5405
Yuma 04:14:27 -21.4 Dark Up 34.9 160.0 Up 03:59:27 - 04:29:27 5373

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 04:14UT)
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 2017/09/01 16:59:58 UT

Marc W. Buie, Southwest Research Institute

RECON