RECON: TNO occultation with 500885

Event between (500885) 13JL65 and star UC4-375-078570 with event index number of 221488

Geocentric closest approach at 2018/06/08 08:35:23 UTC

J2000 position of star is 16:46:07.0 -15:08:24
Equinox of date position of star is 16:47:08.3 -15:10:17
Stellar brightness R=14.5, use SENSEUP=128
Star is 114 degrees from the moon. Moon is 34% illuminated.
TNO apparent brightness V=24.5

[RECON map]
TNO is 35.9 AU from the Sun and 34.9 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 308 seconds.
The 1-sigma cross-track error in the shadow position is 2159 km.
The sky-plane scale is 25306.3 km/arcsec.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.5 km assuming a 5% albedo -- 4.0 sec chord
Diameter=39.0 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 500885, (2018/06/08 08:35UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.4 -26:28:17  0.9 11.95 116
13Zet Oph      16:38:10.6 -10:36:11  2.6  5.07 117
PPM 232182     16:49:29.9 -14:56:27  6.2  0.61 114
PPM 232180     16:49:18.2 -15:23:31  7.8  0.56 114
PPM 232124     16:46:42.3 -15:27:41  9.4  0.31 114
500885         16:47:10.1 -15:10:21 14.5       114
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 2.9 sigma about the mid-time.
The median site spacing is 12.9 km RECON observability=1.0 and success probability=8.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:35:05 -17.7 AT Down 24.6 195.4 Low 08:20:05 - 08:50:05 3105
Tonasket 08:35:05 -17.9 AT Down 24.9 195.4 Low 08:20:05 - 08:50:05 3094
Okanogan 08:35:05 -18.3 Dark Down 25.2 195.3 Low 08:20:05 - 08:50:05 3078
Brewster 08:35:05 -18.6 Dark Down 25.5 195.1 Low 08:20:05 - 08:50:05 3064
Manson/Chelan 08:35:06 -18.8 Dark Down 25.8 194.8 Low 08:20:06 - 08:50:06 3053
Entiat 08:35:06 -19.0 Dark Down 26.0 194.7 Low 08:20:06 - 08:50:06 3042
Wenatchee 08:35:06 -19.3 Dark Down 26.3 194.7 Low 08:20:06 - 08:50:06 3029
Ellensburg 08:35:06 -19.7 Dark Down 26.7 194.5 Low 08:20:06 - 08:50:06 3008
Yakima 08:35:06 -20.1 Dark Down 27.1 194.5 Low 08:20:06 - 08:50:06 2987
Toppenish/White Swan 08:35:05 -20.3 Dark Down 27.3 194.7 Low 08:20:05 - 08:50:05 2976
Pasco 08:35:01 -20.3 Dark Down 27.2 196.1 Low 08:20:01 - 08:50:01 2974
PNWRO 08:35:00 -20.5 Dark Down 27.4 196.4 Low 08:20:00 - 08:50:00 2962
George/Umatilla 08:35:02 -20.7 Dark Down 27.5 195.9 Low 08:20:02 - 08:50:02 2956
Goldendale 08:35:06 -20.9 Dark Down 27.9 194.3 Low 08:20:06 - 08:50:06 2946
The Dalles 08:35:07 -21.2 Dark Down 28.2 194.0 Low 08:20:07 - 08:50:07 2933
Maupin 08:35:06 -21.6 Dark Down 28.6 194.1 Low 08:20:06 - 08:50:06 2911
Madras/Culver 08:35:06 -22.1 Dark Down 29.1 194.2 Low 08:20:06 - 08:50:06 2882
Redmond 08:35:06 -22.5 Dark Down 29.5 194.2 Low 08:20:06 - 08:50:06 2862
Sisters 08:35:07 -22.5 Dark Down 29.5 193.7 Low 08:20:07 - 08:50:07 2862
Bend 08:35:06 -22.7 Dark Down 29.7 194.0 Low 08:20:06 - 08:50:06 2850
Oregon Observatory 08:35:06 -22.9 Dark Down 29.9 193.9 Low 08:20:06 - 08:50:06 2840
La Pine/Gilchrist 08:35:06 -23.1 Dark Down 30.1 193.9 Up 08:20:06 - 08:50:06 2828
North Lake 08:35:04 -23.5 Dark Down 30.4 194.6 Up 08:20:04 - 08:50:04 2806
Paisley 08:35:02 -24.0 Dark Down 30.9 195.1 Up 08:20:02 - 08:50:02 2776
Chiloquin 08:35:06 -24.3 Dark Down 31.2 193.6 Up 08:20:06 - 08:50:06 2763
Lakeview 08:35:01 -24.5 Dark Down 31.3 195.4 Up 08:20:01 - 08:50:01 2747
Klamath Falls 08:35:06 -24.6 Dark Down 31.6 193.8 Up 08:20:06 - 08:50:06 2744
Tulelake 08:35:04 -24.8 Dark Down 31.8 194.2 Up 08:20:04 - 08:50:04 2729
Cedarville 08:35:00 -25.1 Dark Down 31.9 195.7 Up 08:20:00 - 08:50:00 2709
Fall River/Burney 08:35:04 -25.7 Dark Down 32.6 194.4 Up 08:20:04 - 08:50:04 2676
Susanville 08:35:00 -26.3 Dark Down 33.1 195.3 Up 08:20:00 - 08:50:00 2640
Niwot 08:34:10 -23.3 Dark Up 28.7 211.7 Low 08:19:10 - 08:49:10 2630
Gimple 08:35:00 -26.6 Dark Down 33.4 195.1 Up 08:20:00 - 08:50:00 2622
Greenville 08:35:01 -26.6 Dark Down 33.4 195.0 Up 08:20:01 - 08:50:01 2622
Quincy 08:35:01 -26.8 Dark Down 33.6 195.1 Up 08:20:01 - 08:50:01 2609
Portola 08:34:59 -26.8 Dark Down 33.6 195.6 Up 08:19:59 - 08:49:59 2603
Reno 08:34:57 -27.0 Dark Down 33.8 196.4 Up 08:19:57 - 08:49:57 2589
Carson City 08:34:57 -27.4 Dark Down 34.1 196.5 Up 08:19:57 - 08:49:57 2567
Yerington 08:34:54 -27.5 Dark Down 34.1 197.2 Up 08:19:54 - 08:49:54 2556
Gardnerville 08:34:56 -27.6 Dark Down 34.3 196.6 Up 08:19:56 - 08:49:56 2551
Hawthorne 08:34:52 -27.9 Dark Down 34.5 197.9 Up 08:19:52 - 08:49:52 2528
Tonopah 08:34:46 -28.1 Dark Down 34.6 199.6 Up 08:19:46 - 08:49:46 2502
Lee Vining 08:34:53 -28.5 Dark Down 35.1 197.5 Up 08:19:53 - 08:49:53 2490
Bishop 08:34:50 -29.0 Dark Down 35.5 198.4 Up 08:19:50 - 08:49:50 2454
Beatty 08:34:43 -29.2 Dark Down 35.5 200.4 Up 08:19:43 - 08:49:43 2427
Indian Springs 08:34:39 -29.3 Dark Down 35.5 201.7 Up 08:19:39 - 08:49:39 2407
Lone Pine 08:34:47 -29.7 Dark Down 36.2 199.0 Up 08:19:47 - 08:49:47 2404
Henderson 08:34:36 -29.7 Dark Down 35.8 202.6 Up 08:19:36 - 08:49:36 2373
Searchlight/Boulder City 08:34:35 -30.2 Dark Down 36.3 202.8 Up 08:19:35 - 08:49:35 2333
Patrick 08:34:31 -30.0 Dark Down 36.0 204.0 Up 08:19:31 - 08:49:31 2331
Kingman/Dolan Springs 08:34:32 -30.3 Dark Down 36.3 203.9 Up 08:19:32 - 08:49:32 2315
Laughlin/Bullhead City 08:34:34 -30.4 Dark Down 36.5 203.3 Up 08:19:34 - 08:49:34 2313
DCO 08:34:29 -30.2 Dark Down 36.1 204.9 Up 08:19:29 - 08:49:29 2311
CPSLO 08:34:56 -31.3 Dark Down 38.0 196.3 Up 08:19:56 - 08:49:56 2307
Mohave Valley 08:34:34 -30.7 Dark Down 36.7 203.4 Up 08:19:34 - 08:49:34 2294
Lake Havasu City 08:34:32 -31.0 Dark Down 37.0 203.8 Up 08:19:32 - 08:49:32 2267
Parker 08:34:31 -31.3 Dark Down 37.3 203.9 Up 08:19:31 - 08:49:31 2242
Wildwood 08:34:47 -32.2 Dark Down 38.7 199.0 Up 08:19:47 - 08:49:47 2229
Idyllwild 08:34:40 -32.2 Dark Down 38.5 201.3 Up 08:19:40 - 08:49:40 2209
Blythe 08:34:32 -31.9 Dark Down 37.9 203.7 Up 08:19:32 - 08:49:32 2204
Calipatria 08:34:35 -32.6 Dark Down 38.7 202.8 Up 08:19:35 - 08:49:35 2168
Yuma 08:34:31 -32.8 Dark Down 38.8 204.0 Up 08:19:31 - 08:49:31 2138

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 500885, (2018/06/08 08:35UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 11.95 116
13Zet Oph      16:37:09.6 -10:34:01  2.6  5.07 117
PPM 232182     16:48:27.0 -14:54:34  6.2  0.61 114
PPM 232180     16:48:15.0 -15:21:38  7.8  0.56 114
PPM 232124     16:45:39.1 -15:25:44  9.4  0.31 114
500885         16:46:07.0 -15:08:24 14.5       114
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:43:22 UT

Marc W. Buie, Southwest Research Institute

RECON