RECON: TNO occultation with 131697

Event between (131697) 01XH255 and star UC4-531-048534 with event index number of 104973

Geocentric closest approach at 2018/02/27 08:55:05 UTC

J2000 position of star is 09:16:25.9 +16:09:53
Equinox of date position of star is 09:17:23.7 +16:05:30
Stellar brightness R=14.7, use SENSEUP=128
Star is 14 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=23.4

[RECON map]
TNO is 33.0 AU from the Sun and 32.1 AU from the Earth.
The TNO is moving 22.7 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 301 seconds.
The 1-sigma cross-track error in the shadow position is 3459 km.
The sky-plane scale is 23275.8 km/arcsec.

The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 6.1 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is 5:4E
 
 
 
 
 
 

Star training set for 131697, (2018/02/27 08:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.2 +11:52:40  1.3 13.27  27
PPM 126361     09:22:15.4 +15:17:36  6.4  1.41  15
PPM 126247     09:15:58.2 +15:55:42  8.3  0.39  14
PPM 126294     09:18:44.5 +16:04:05 10.4  0.31  14
131697         09:17:26.3 +16:05:18 14.7        14
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 3.0 sigma about the mid-time.
The median site spacing is 16.0 km RECON observability=1.0 and success probability=8.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:54:16 -48.3 Dark Up 48.1 229.9 Up 08:39:16 - 09:09:16 3358
Tonasket 08:54:15 -48.6 Dark Up 48.2 230.1 Up 08:39:15 - 09:09:15 3341
Okanogan 08:54:14 -48.9 Dark Up 48.5 230.2 Up 08:39:14 - 09:09:14 3312
Brewster 08:54:13 -49.2 Dark Up 48.8 230.2 Up 08:39:13 - 09:09:13 3286
Manson/Chelan 08:54:14 -49.5 Dark Up 49.1 229.9 Up 08:39:14 - 09:09:14 3260
Entiat 08:54:13 -49.7 Dark Up 49.3 230.1 Up 08:39:13 - 09:09:13 3241
Wenatchee 08:54:13 -50.0 Dark Up 49.5 230.2 Up 08:39:13 - 09:09:13 3219
Ellensburg 08:54:13 -50.4 Dark Up 49.9 230.3 Up 08:39:13 - 09:09:13 3182
Pasco 08:54:06 -50.8 Dark Up 49.6 232.7 Up 08:39:06 - 09:09:06 3166
PNWRO 08:54:06 -51.0 Dark Up 49.6 233.2 Up 08:39:06 - 09:09:06 3154
Yakima 08:54:11 -50.8 Dark Up 50.2 230.6 Up 08:39:11 - 09:09:11 3150
Toppenish/White Swan 08:54:10 -51.0 Dark Up 50.2 231.0 Up 08:39:10 - 09:09:10 3138
Niwot 08:53:14 -51.2 Dark Up 43.5 252.7 Up 08:38:14 - 09:08:14 3134
George/Umatilla 08:54:06 -51.2 Dark Up 49.9 232.7 Up 08:39:06 - 09:09:06 3134
Goldendale 08:54:09 -51.6 Dark Up 50.8 231.0 Up 08:39:09 - 09:09:09 3083
The Dalles 08:54:10 -51.9 Dark Up 51.1 230.7 Up 08:39:10 - 09:09:10 3054
Maupin 08:54:09 -52.3 Dark Up 51.3 231.3 Up 08:39:09 - 09:09:09 3024
Madras/Culver 08:54:07 -52.8 Dark Up 51.7 231.8 Up 08:39:07 - 09:09:07 2980
Redmond 08:54:06 -53.2 Dark Up 52.0 232.0 Up 08:39:06 - 09:09:06 2950
Sisters 08:54:08 -53.2 Dark Up 52.2 231.5 Up 08:39:08 - 09:09:08 2940
Bend 08:54:06 -53.4 Dark Up 52.2 232.1 Up 08:39:06 - 09:09:06 2929
Oregon Observatory 08:54:06 -53.6 Dark Up 52.4 232.1 Up 08:39:06 - 09:09:06 2911
La Pine/Gilchrist 08:54:06 -53.8 Dark Up 52.5 232.2 Up 08:39:06 - 09:09:06 2893
North Lake 08:54:03 -54.1 Dark Up 52.4 233.4 Up 08:39:03 - 09:09:03 2876
Paisley 08:54:01 -54.6 Dark Up 52.6 234.4 Up 08:39:01 - 09:09:01 2842
Lakeview 08:53:58 -55.0 Dark Up 52.7 235.2 Up 08:38:58 - 09:08:58 2807
Chiloquin 08:54:04 -54.9 Dark Up 53.4 232.9 Up 08:39:04 - 09:09:04 2791
Klamath Falls 08:54:02 -55.3 Dark Up 53.6 233.4 Up 08:39:02 - 09:09:02 2765
Cedarville 08:53:56 -55.6 Dark Up 53.0 236.1 Up 08:38:56 - 09:08:56 2758
Tulelake 08:54:01 -55.5 Dark Up 53.5 234.1 Up 08:39:01 - 09:09:01 2752
Fall River/Burney 08:53:58 -56.3 Dark Up 54.0 235.2 Up 08:38:58 - 09:08:58 2679
Susanville 08:53:54 -56.8 Dark Up 53.9 236.8 Up 08:38:54 - 09:08:54 2650
Gimple 08:53:54 -57.1 Dark Up 54.2 236.8 Up 08:38:54 - 09:08:54 2620
Greenville 08:53:54 -57.1 Dark Up 54.3 236.7 Up 08:38:54 - 09:08:54 2617
Portola 08:53:52 -57.3 Dark Up 54.1 237.7 Up 08:38:52 - 09:08:52 2605
Reno 08:53:49 -57.4 Dark Up 53.9 238.8 Up 08:38:49 - 09:08:49 2604
Quincy 08:53:54 -57.3 Dark Up 54.4 237.0 Up 08:38:54 - 09:08:54 2600
Yerington 08:53:46 -57.7 Dark Up 53.7 240.2 Up 08:38:46 - 09:08:46 2579
Carson City 08:53:48 -57.7 Dark Up 54.0 239.2 Up 08:38:48 - 09:08:48 2575
Tonopah 08:53:38 -58.0 Dark Up 52.8 243.4 Up 08:38:38 - 09:08:38 2565
Hawthorne 08:53:43 -58.0 Dark Up 53.6 241.3 Up 08:38:43 - 09:08:43 2557
Gardnerville 08:53:47 -57.9 Dark Up 54.1 239.6 Up 08:38:47 - 09:08:47 2555
Lee Vining 08:53:43 -58.7 Dark Up 54.2 241.4 Up 08:38:43 - 09:08:43 2493
Indian Springs 08:53:29 -58.8 Dark Up 52.4 246.8 Up 08:38:29 - 09:08:29 2491
Beatty 08:53:33 -58.9 Dark Up 53.0 245.3 Up 08:38:33 - 09:08:33 2481
Henderson 08:53:25 -59.0 Dark Up 52.1 248.1 Up 08:38:25 - 09:08:25 2469
Bishop 08:53:39 -59.0 Dark Up 54.0 243.0 Up 08:38:39 - 09:08:39 2466
Patrick 08:53:20 -59.1 Dark Up 51.5 249.9 Up 08:38:20 - 09:08:20 2454
DCO 08:53:18 -59.0 Dark Up 51.0 250.9 Up 08:38:18 - 09:08:18 2453
Kingman/Dolan Springs 08:53:20 -59.3 Dark Up 51.7 249.9 Up 08:38:20 - 09:08:20 2428
Searchlight/Boulder City 08:53:24 -59.5 Dark Up 52.2 248.8 Up 08:38:24 - 09:08:24 2422
Lone Pine 08:53:36 -59.6 Dark Up 54.1 244.3 Up 08:38:36 - 09:08:36 2411
Laughlin/Bullhead City 08:53:22 -59.6 Dark Up 52.1 249.5 Up 08:38:22 - 09:08:22 2408
Mohave Valley 08:53:21 -59.8 Dark Up 52.2 249.8 Up 08:38:21 - 09:08:21 2384
Lake Havasu City 08:53:19 -60.0 Dark Up 52.1 250.5 Up 08:38:19 - 09:08:19 2358
Parker 08:53:18 -60.3 Dark Up 52.2 251.0 Up 08:38:18 - 09:08:18 2329
Blythe 08:53:17 -60.9 Dark Up 52.6 251.3 Up 08:38:17 - 09:08:17 2272
CPSLO 08:53:40 -61.6 Dark Up 56.5 243.1 Up 08:38:40 - 09:08:40 2208
Idyllwild 08:53:24 -61.7 Dark Up 54.2 249.2 Up 08:38:24 - 09:08:24 2207
Calipatria 08:53:19 -61.7 Dark Up 53.5 251.1 Up 08:38:19 - 09:08:19 2195
Yuma 08:53:15 -61.7 Dark Up 53.0 252.5 Up 08:38:15 - 09:08:15 2189
Wildwood 08:53:30 -62.1 Dark Up 55.5 246.9 Up 08:38:30 - 09:08:30 2172

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 131697, (2018/02/27 08:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 13.27  27
PPM 126361     09:21:15.3 +15:22:17  6.4  1.41  15
PPM 126247     09:14:57.8 +16:00:16  8.3  0.39  14
PPM 126294     09:17:44.2 +16:08:41 10.4  0.31  14
131697         09:16:25.9 +16:09:53 14.7        14
Positions are for J2000

Event circumstances last updated at 2017/05/20 18:05:19 UT

Marc W. Buie, Southwest Research Institute

RECON