RECON: TNO occultation with 12HE85

Event between 12HE85 and star GA0700:33151250 with event index number of 264005

Geocentric closest approach at 2020/05/20 10:52:07 UTC

J2000 position of star is 19:27:23.4 -19:23:52
Equinox of date position of star is 19:28:34.3 -19:21:21
Stellar brightness G=16.4, use SENSEUP=128
Star is 104 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=26.1

[RECON map]
TNO is 40.3 AU from the Sun and 39.7 AU from the Earth.
The TNO is moving 13.4 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 612 seconds.
The 1-sigma cross-track error in the shadow position is 2230 km.
The sky-plane scale is 28774.0 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=93.8 km assuming a 5% albedo -- 4.5 sec chord
Diameter=38.3 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is 9:5EEEE
 
 
 
 
 
 

Star training set for 12HE85, (2020/05/20 10:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:39.6 -26:28:32  0.9 41.38 144
Nunki          18:56:31.7 -26:16:11  2.0 10.11 112
45Rho2Sgr      19:23:02.2 -18:16:09  5.8  1.70 105
PPM 236018     19:29:14.8 -19:18:00  8.1  0.17 104
12HE85         19:28:35.0 -19:21:19 16.4       104
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 1.5 sigma about the mid-time.
The median site spacing is 16.6 km RECON observability=0.6 and success probability=0.9%
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 10:52:30 -9.3 NT Down 19.9 170.5 Really Low 10:37:30 - 11:07:30 7239
Kelowna 10:52:31 -9.7 NT Down 20.2 170.3 Low 10:37:31 - 11:07:31 7224
Peachland 10:52:34 -9.9 NT Down 20.3 170.0 Low 10:37:34 - 11:07:34 7220
Summerland 10:52:34 -10.0 NT Down 20.5 170.1 Low 10:37:34 - 11:07:34 7214
Penticton 10:52:32 -10.0 NT Down 20.5 170.2 Low 10:37:32 - 11:07:32 7211
Oliver 10:52:33 -10.2 NT Down 20.9 170.2 Low 10:37:33 - 11:07:33 7197
Anarchist Mountain Observatory 10:52:31 -10.3 NT Down 21.1 170.4 Low 10:37:31 - 11:07:31 7191
Tonasket 10:52:33 -10.5 NT Down 21.4 170.3 Low 10:37:33 - 11:07:33 7177
Victoria 10:52:53 -12.4 AT Down 21.0 166.4 Low 10:37:53 - 11:07:53 7168
Okanogan 10:52:35 -10.9 NT Down 21.7 170.1 Low 10:37:35 - 11:07:35 7164
Brewster 10:52:35 -11.2 NT Down 21.9 169.9 Low 10:37:35 - 11:07:35 7152
Manson/Chelan 10:52:38 -11.5 NT Down 22.1 169.5 Low 10:37:38 - 11:07:38 7144
Entiat 10:52:38 -11.7 NT Down 22.3 169.4 Low 10:37:38 - 11:07:38 7134
Wenatchee 10:52:39 -11.9 NT Down 22.5 169.3 Low 10:37:39 - 11:07:39 7123
Ellensburg 10:52:40 -12.3 AT Down 22.9 169.1 Low 10:37:40 - 11:07:40 7105
Yakima 10:52:41 -12.6 AT Down 23.3 169.0 Low 10:37:41 - 11:07:41 7087
Toppenish/White Swan 10:52:40 -12.7 AT Down 23.5 169.2 Low 10:37:40 - 11:07:40 7077
Pasco 10:52:34 -12.2 AT Down 23.8 170.4 Low 10:37:34 - 11:07:34 7071
PNWRO 10:52:33 -12.3 AT Down 24.1 170.7 Low 10:37:33 - 11:07:33 7060
Goldendale 10:52:44 -13.3 AT Down 24.0 168.7 Low 10:37:44 - 11:07:44 7052
The Dalles 10:52:46 -13.6 AT Down 24.2 168.3 Low 10:37:46 - 11:07:46 7042
Maupin 10:52:46 -13.9 AT Down 24.6 168.4 Low 10:37:46 - 11:07:46 7022
Sisters 10:52:51 -14.8 AT Down 25.4 167.8 Low 10:37:51 - 11:07:51 6980
Redmond 10:52:47 -14.6 AT Down 25.5 168.2 Low 10:37:47 - 11:07:47 6979
Bend 10:52:50 -14.8 AT Down 25.7 168.1 Low 10:37:50 - 11:07:50 6969
Oregon Observatory 10:52:51 -15.0 AT Down 25.8 167.9 Low 10:37:51 - 11:07:51 6961
La Pine/Gilchrist 10:52:50 -15.2 AT Down 26.0 167.8 Low 10:37:50 - 11:07:50 6950
North Lake 10:52:47 -15.3 AT Down 26.5 168.4 Low 10:37:47 - 11:07:47 6929
Paisley 10:52:47 -15.5 AT Down 27.1 168.7 Low 10:37:47 - 11:07:47 6901
Klamath Falls 10:52:54 -16.4 AT Down 27.4 167.4 Low 10:37:54 - 11:07:54 6876
Lakeview 10:52:46 -15.8 AT Down 27.7 168.9 Low 10:37:46 - 11:07:46 6874
Cedarville 10:52:46 -16.2 AT Down 28.3 169.0 Low 10:37:46 - 11:07:46 6840
Fall River/Burney 10:52:54 -17.1 AT Down 28.6 167.7 Low 10:37:54 - 11:07:54 6813
Susanville 10:52:50 -17.2 AT Down 29.4 168.4 Low 10:37:50 - 11:07:50 6779
Greenville 10:52:52 -17.6 AT Down 29.6 168.0 Low 10:37:52 - 11:07:52 6763
Gimple 10:52:51 -17.5 AT Down 29.6 168.1 Low 10:37:51 - 11:07:51 6763
Quincy 10:52:52 -17.7 AT Down 29.8 168.0 Low 10:37:52 - 11:07:52 6752
Portola 10:52:49 -17.6 AT Down 30.0 168.5 Low 10:37:49 - 11:07:49 6745
Reno 10:52:46 -17.4 AT Down 30.3 169.2 Up 10:37:46 - 11:07:46 6730
Carson City 10:52:46 -17.7 AT Down 30.7 169.1 Up 10:37:46 - 11:07:46 6709
Niwot 10:51:17 -8.8 NT Up 30.4 184.8 Up 10:36:17 - 11:06:17 6706
SwRI 10:51:18 -8.9 NT Up 30.5 184.7 Up 10:36:18 - 11:06:18 6700
Yerington 10:52:42 -17.5 AT Down 31.0 169.8 Up 10:37:42 - 11:07:42 6698
Gardnerville 10:52:46 -17.8 AT Down 30.9 169.2 Up 10:37:46 - 11:07:46 6695
Hawthorne 10:52:40 -17.5 AT Down 31.5 170.3 Up 10:37:40 - 11:07:40 6670
Tonopah 10:52:31 -17.1 AT Down 32.1 171.8 Up 10:37:31 - 11:07:31 6641
Lee Vining 10:52:45 -18.2 Dark Down 32.0 169.7 Up 10:37:45 - 11:07:45 6638
Bishop 10:52:40 -18.2 Dark Down 32.7 170.4 Up 10:37:40 - 11:07:40 6601
Beatty 10:52:30 -17.7 AT Down 33.3 172.2 Up 10:37:30 - 11:07:30 6570
Indian Springs 10:52:23 -17.3 AT Down 33.8 173.3 Up 10:37:23 - 11:07:23 6547
Henderson 10:52:20 -17.2 AT Down 34.3 174.1 Up 10:37:20 - 11:07:20 6512
Searchlight/Boulder City 10:52:20 -17.6 AT Down 34.9 174.1 Up 10:37:20 - 11:07:20 6476
CPSLO 10:52:56 -21.0 Dark Down 34.4 167.7 Up 10:37:56 - 11:07:56 6474
Patrick 10:52:12 -17.0 AT Down 35.1 175.3 Up 10:37:12 - 11:07:12 6469
Kingman/Dolan Springs 10:52:13 -17.2 AT Down 35.3 175.0 Up 10:37:13 - 11:07:13 6456
Laughlin/Bullhead City 10:52:17 -17.6 AT Down 35.2 174.5 Up 10:37:17 - 11:07:17 6455
DCO 10:52:08 -16.8 AT Down 35.4 176.1 Up 10:37:08 - 11:07:08 6447
Mohave Valley 10:52:17 -17.7 AT Down 35.5 174.5 Up 10:37:17 - 11:07:17 6438
Lake Havasu City 10:52:15 -17.9 AT Down 35.9 174.7 Up 10:37:15 - 11:07:15 6411
Wildwood 10:52:44 -20.7 Dark Down 35.9 169.9 Up 10:37:44 - 11:07:44 6395
Parker 10:52:16 -18.1 Dark Down 36.3 174.7 Up 10:37:16 - 11:07:16 6388
Idyllwild 10:52:31 -19.8 Dark Down 36.5 171.9 Up 10:37:31 - 11:07:31 6369
Blythe 10:52:19 -18.6 Dark Down 36.8 174.3 Up 10:37:19 - 11:07:19 6354
George/Scottsdale 10:52:00 -16.8 AT Down 36.8 177.5 Up 10:37:00 - 11:07:00 6351
Calipatria 10:52:25 -19.5 Dark Down 37.2 173.2 Up 10:37:25 - 11:07:25 6324
Yuma 10:52:20 -19.2 Dark Down 37.7 174.2 Up 10:37:20 - 11:07:20 6292

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, (2020/05/20 10:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 41.38 144
Nunki          18:55:15.9 -26:17:49  2.0 10.11 112
45Rho2Sgr      19:21:51.1 -18:18:32  5.8  1.70 105
PPM 236018     19:28:03.3 -19:20:34  8.1  0.17 104
12HE85         19:27:23.4 -19:23:52 16.4       104
Positions are for J2000

Event circumstances last updated at 2020/03/10 21:29:29 UT

Marc W. Buie, Southwest Research Institute

RECON