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 09:17:25.5 +16:05:21
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 473 seconds.
The 1-sigma cross-track error in the shadow position is 5294 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     09:18:44.6 +16:04:04 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 1.9 sigma about the mid-time.
The median site spacing is 15.7 km RECON observability=1.0 and success probability=5.9%
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 3350
Tonasket 08:54:16 -48.6 Dark Up 48.2 230.1 Up 08:39:16 - 09:09:16 3333
Okanogan 08:54:15 -48.9 Dark Up 48.5 230.2 Up 08:39:15 - 09:09:15 3304
Brewster 08:54:15 -49.2 Dark Up 48.8 230.2 Up 08:39:15 - 09:09:15 3278
Manson/Chelan 08:54:15 -49.5 Dark Up 49.1 230.0 Up 08:39:15 - 09:09:15 3252
Entiat 08:54:14 -49.7 Dark Up 49.3 230.1 Up 08:39:14 - 09:09:14 3233
Wenatchee 08:54:14 -50.0 Dark Up 49.5 230.2 Up 08:39:14 - 09:09:14 3211
Ellensburg 08:54:13 -50.4 Dark Up 49.9 230.3 Up 08:39:13 - 09:09:13 3173
Pasco 08:54:08 -50.8 Dark Up 49.6 232.7 Up 08:39:08 - 09:09:08 3157
PNWRO 08:54:06 -51.0 Dark Up 49.6 233.2 Up 08:39:06 - 09:09:06 3145
Yakima 08:54:12 -50.8 Dark Up 50.2 230.6 Up 08:39:12 - 09:09:12 3141
Toppenish/White Swan 08:54:11 -51.0 Dark Up 50.2 231.0 Up 08:39:11 - 09:09:11 3129
George/Umatilla 08:54:07 -51.2 Dark Up 49.9 232.7 Up 08:39:07 - 09:09:07 3125
Niwot 08:53:14 -51.2 Dark Up 43.5 252.7 Up 08:38:14 - 09:08:14 3123
Goldendale 08:54:10 -51.6 Dark Up 50.8 231.0 Up 08:39:10 - 09:09:10 3074
The Dalles 08:54:11 -51.9 Dark Up 51.1 230.8 Up 08:39:11 - 09:09:11 3045
Maupin 08:54:09 -52.3 Dark Up 51.3 231.3 Up 08:39:09 - 09:09:09 3016
Madras/Culver 08:54:08 -52.8 Dark Up 51.7 231.8 Up 08:39:08 - 09:09:08 2971
Redmond 08:54:07 -53.2 Dark Up 52.0 232.1 Up 08:39:07 - 09:09:07 2941
Sisters 08:54:08 -53.2 Dark Up 52.2 231.5 Up 08:39:08 - 09:09:08 2931
Bend 08:54:07 -53.4 Dark Up 52.2 232.1 Up 08:39:07 - 09:09:07 2919
Oregon Observatory 08:54:07 -53.6 Dark Up 52.4 232.1 Up 08:39:07 - 09:09:07 2901
La Pine/Gilchrist 08:54:06 -53.8 Dark Up 52.5 232.2 Up 08:39:06 - 09:09:06 2883
North Lake 08:54:04 -54.1 Dark Up 52.4 233.4 Up 08:39:04 - 09:09:04 2866
Paisley 08:54:01 -54.6 Dark Up 52.5 234.4 Up 08:39:01 - 09:09:01 2833
Lakeview 08:53:59 -55.0 Dark Up 52.7 235.2 Up 08:38:59 - 09:08:59 2797
Chiloquin 08:54:04 -54.9 Dark Up 53.4 232.9 Up 08:39:04 - 09:09:04 2781
Klamath Falls 08:54:03 -55.3 Dark Up 53.6 233.4 Up 08:39:03 - 09:09:03 2755
Cedarville 08:53:56 -55.6 Dark Up 53.0 236.1 Up 08:38:56 - 09:08:56 2749
Tulelake 08:54:02 -55.5 Dark Up 53.5 234.1 Up 08:39:02 - 09:09:02 2743
Fall River/Burney 08:53:59 -56.3 Dark Up 54.0 235.2 Up 08:38:59 - 09:08:59 2669
Susanville 08:53:55 -56.8 Dark Up 53.9 236.8 Up 08:38:55 - 09:08:55 2640
Gimple 08:53:55 -57.1 Dark Up 54.2 236.9 Up 08:38:55 - 09:08:55 2610
Greenville 08:53:55 -57.1 Dark Up 54.3 236.7 Up 08:38:55 - 09:08:55 2608
Portola 08:53:53 -57.3 Dark Up 54.1 237.7 Up 08:38:53 - 09:08:53 2595
Reno 08:53:50 -57.4 Dark Up 53.9 238.8 Up 08:38:50 - 09:08:50 2594
Quincy 08:53:55 -57.3 Dark Up 54.4 237.0 Up 08:38:55 - 09:08:55 2591
Yerington 08:53:47 -57.7 Dark Up 53.7 240.2 Up 08:38:47 - 09:08:47 2569
Carson City 08:53:49 -57.7 Dark Up 54.0 239.2 Up 08:38:49 - 09:08:49 2564
Tonopah 08:53:39 -58.0 Dark Up 52.8 243.4 Up 08:38:39 - 09:08:39 2554
Hawthorne 08:53:44 -58.0 Dark Up 53.6 241.3 Up 08:38:44 - 09:08:44 2547
Gardnerville 08:53:48 -57.9 Dark Up 54.1 239.6 Up 08:38:48 - 09:08:48 2545
Lee Vining 08:53:44 -58.7 Dark Up 54.2 241.4 Up 08:38:44 - 09:08:44 2482
Indian Springs 08:53:30 -58.8 Dark Up 52.4 246.8 Up 08:38:30 - 09:08:30 2480
Beatty 08:53:34 -58.9 Dark Up 53.0 245.3 Up 08:38:34 - 09:08:34 2471
Henderson 08:53:26 -59.0 Dark Up 52.1 248.1 Up 08:38:26 - 09:08:26 2458
Bishop 08:53:40 -59.0 Dark Up 54.0 243.0 Up 08:38:40 - 09:08:40 2455
Patrick 08:53:22 -59.1 Dark Up 51.5 249.9 Up 08:38:22 - 09:08:22 2443
DCO 08:53:18 -59.0 Dark Up 51.0 250.9 Up 08:38:18 - 09:08:18 2442
Kingman/Dolan Springs 08:53:21 -59.3 Dark Up 51.7 249.9 Up 08:38:21 - 09:08:21 2418
Searchlight/Boulder City 08:53:25 -59.5 Dark Up 52.2 248.8 Up 08:38:25 - 09:08:25 2411
Lone Pine 08:53:37 -59.6 Dark Up 54.1 244.3 Up 08:38:37 - 09:08:37 2401
Laughlin/Bullhead City 08:53:23 -59.6 Dark Up 52.1 249.5 Up 08:38:23 - 09:08:23 2398
Mohave Valley 08:53:22 -59.8 Dark Up 52.2 249.8 Up 08:38:22 - 09:08:22 2374
Lake Havasu City 08:53:20 -60.0 Dark Up 52.1 250.5 Up 08:38:20 - 09:08:20 2348
Parker 08:53:19 -60.3 Dark Up 52.2 251.0 Up 08:38:19 - 09:08:19 2318
Blythe 08:53:18 -60.9 Dark Up 52.6 251.3 Up 08:38:18 - 09:08:18 2262
CPSLO 08:53:41 -61.6 Dark Up 56.5 243.1 Up 08:38:41 - 09:08:41 2198
Idyllwild 08:53:25 -61.7 Dark Up 54.2 249.2 Up 08:38:25 - 09:08:25 2196
Calipatria 08:53:20 -61.7 Dark Up 53.5 251.1 Up 08:38:20 - 09:08:20 2185
Yuma 08:53:16 -61.7 Dark Up 53.0 252.5 Up 08:38:16 - 09:08:16 2179
Wildwood 08:53:32 -62.1 Dark Up 55.5 246.9 Up 08:38:32 - 09:08:32 2162

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 2017/12/04 18:40:31 UT

Marc W. Buie, Southwest Research Institute

RECON