RECON: TNO occultation with 315530

Event between (315530) 08AP129 and star UC4-639-044345 with event index number of 100516

Geocentric closest approach at 2018/01/30 10:38:12 UTC

J2000 position of star is 10:00:55.9 +37:47:57
Equinox of date position of star is 10:01:56.0 +37:43:05
Stellar brightness R=14.6
Star is 35 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=21.1

[RECON map]
TNO is 38.5 AU from the Sun and 37.6 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 111 seconds.
The 1-sigma cross-track error in the shadow position is 2356 km.
The sky-plane scale is 27280.1 km/arcsec.

The TNO has an absolute magnitude Hv=5.2
Diameter=549.6 km assuming a 5% albedo -- 26.3 sec chord
Diameter=224.4 km assuming a 30% albedo -- 10.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 315530, (2018/01/30 10:38UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.0 +11:52:41  1.3 25.89  35
Merak          11:02:55.3 +56:17:06  2.4 21.17  52
21 LMi         10:08:29.5 +35:09:21  4.6  2.87  35
PPM 074943     10:04:00.8 +37:48:20  8.5  0.41  35
PPM 074932     10:03:00.6 +37:39:19  9.4  0.21  35
315530         10:02:00.7 +37:42:42 14.6        35
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 5.0 sigma about the mid-time.
The median site spacing is 15.7 km RECON observability=1.0 and success probability=7.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 10:37:41 -46.9 Dark Up 72.1 238.7 Up 10:27:58 - 10:47:23 4704
Tonasket 10:37:40 -47.0 Dark Up 72.3 239.3 Up 10:27:57 - 10:47:22 4684
Niwot 10:36:44 -41.0 Dark Up 64.1 275.7 Up 10:27:01 - 10:46:26 4654
Okanogan 10:37:41 -47.3 Dark Up 72.5 240.0 Up 10:27:58 - 10:47:23 4649
Brewster 10:37:40 -47.6 Dark Up 72.8 240.3 Up 10:27:57 - 10:47:22 4617
Manson/Chelan 10:37:40 -47.9 Dark Up 73.1 240.3 Up 10:27:57 - 10:47:22 4583
Entiat 10:37:40 -48.1 Dark Up 73.2 240.8 Up 10:27:57 - 10:47:22 4561
Wenatchee 10:37:39 -48.2 Dark Up 73.4 241.3 Up 10:27:57 - 10:47:22 4535
Ellensburg 10:37:38 -48.6 Dark Up 73.7 242.1 Up 10:27:56 - 10:47:21 4489
Pasco 10:37:34 -48.2 Dark Up 73.2 246.8 Up 10:27:51 - 10:47:16 4484
PNWRO 10:37:32 -48.2 Dark Up 73.1 247.9 Up 10:27:49 - 10:47:14 4472
Yakima 10:37:37 -48.8 Dark Up 73.9 243.4 Up 10:27:55 - 10:47:20 4452
George/Umatilla 10:37:33 -48.5 Dark Up 73.5 247.5 Up 10:27:51 - 10:47:16 4445
Toppenish/White Swan 10:37:36 -48.9 Dark Up 73.9 244.3 Up 10:27:54 - 10:47:19 4440
Goldendale 10:37:36 -49.4 Dark Up 74.4 245.3 Up 10:27:54 - 10:47:19 4373
The Dalles 10:37:37 -49.7 Dark Up 74.8 245.4 Up 10:27:54 - 10:47:19 4337
Maupin 10:37:35 -49.9 Dark Up 74.9 247.0 Up 10:27:52 - 10:47:17 4304
Madras/Culver 10:37:34 -50.2 Dark Up 75.1 248.8 Up 10:27:52 - 10:47:17 4253
Redmond 10:37:33 -50.4 Dark Up 75.3 250.0 Up 10:27:51 - 10:47:16 4219
Sisters 10:37:34 -50.7 Dark Up 75.5 249.3 Up 10:27:52 - 10:47:17 4204
Bend 10:37:33 -50.6 Dark Up 75.4 250.6 Up 10:27:51 - 10:47:16 4193
Oregon Observatory 10:37:33 -50.8 Dark Up 75.6 251.0 Up 10:27:51 - 10:47:16 4172
La Pine/Gilchrist 10:37:32 -50.9 Dark Up 75.7 251.6 Up 10:27:50 - 10:47:15 4151
North Lake 10:37:29 -50.8 Dark Up 75.4 254.1 Up 10:27:47 - 10:47:12 4138
Paisley 10:37:28 -50.8 Dark Up 75.3 256.7 Up 10:27:45 - 10:47:10 4105
Lakeview 10:37:26 -51.0 Dark Up 75.3 258.8 Up 10:27:44 - 10:47:09 4068
Chiloquin 10:37:31 -51.7 Dark Up 76.3 255.4 Up 10:27:48 - 10:47:13 4034
Cedarville 10:37:23 -51.2 Dark Up 75.3 261.5 Up 10:27:41 - 10:47:06 4016
Klamath Falls 10:37:30 -51.9 Dark Up 76.3 256.8 Up 10:27:47 - 10:47:12 4006
Tulelake 10:37:28 -51.8 Dark Up 76.1 258.3 Up 10:27:45 - 10:47:10 3995
Fall River/Burney 10:37:25 -52.2 Dark Up 76.2 262.0 Up 10:27:43 - 10:47:08 3916
Susanville 10:37:22 -52.0 Dark Up 75.8 265.3 Up 10:27:40 - 10:47:05 3893
Greenville 10:37:22 -52.3 Dark Up 76.0 266.1 Up 10:27:40 - 10:47:05 3854
Reno 10:37:17 -51.8 Dark Up 75.2 269.2 Up 10:27:35 - 10:47:00 3853
Tonopah 10:37:06 -50.5 Dark Up 73.1 275.8 Up 10:27:24 - 10:46:49 3847
Portola 10:37:20 -52.1 Dark Up 75.7 267.8 Up 10:27:38 - 10:47:03 3846
Quincy 10:37:21 -52.4 Dark Up 76.0 266.9 Up 10:27:39 - 10:47:04 3835
Yerington 10:37:14 -51.6 Dark Up 74.7 271.7 Up 10:27:32 - 10:46:57 3835
Carson City 10:37:17 -51.9 Dark Up 75.2 270.6 Up 10:27:35 - 10:47:00 3822
Hawthorne 10:37:13 -51.4 Dark Up 74.2 273.6 Up 10:27:30 - 10:46:55 3818
Gardnerville 10:37:16 -52.0 Dark Up 75.1 271.6 Up 10:27:34 - 10:46:59 3802
DCO 10:36:48 -48.3 Dark Up 69.4 285.0 Up 10:27:05 - 10:46:30 3798
Indian Springs 10:36:59 -49.9 Dark Up 71.7 280.8 Up 10:27:16 - 10:46:41 3793
Patrick 10:36:51 -48.8 Dark Up 70.1 284.2 Up 10:27:09 - 10:46:34 3786
Henderson 10:36:55 -49.5 Dark Up 71.1 282.4 Up 10:27:13 - 10:46:38 3782
Beatty 10:37:03 -50.6 Dark Up 72.6 279.6 Up 10:27:20 - 10:46:45 3766
Kingman/Dolan Springs 10:36:51 -49.0 Dark Up 70.2 284.8 Up 10:27:09 - 10:46:34 3756
Lee Vining 10:37:12 -51.9 Dark Up 74.6 275.4 Up 10:27:30 - 10:46:55 3743
Searchlight/Boulder City 10:36:55 -49.6 Dark Up 70.9 284.0 Up 10:27:12 - 10:46:37 3734
Laughlin/Bullhead City 10:36:52 -49.4 Dark Up 70.6 284.9 Up 10:27:09 - 10:46:34 3726
Bishop 10:37:09 -51.6 Dark Up 74.0 277.8 Up 10:27:26 - 10:46:51 3725
Mohave Valley 10:36:52 -49.5 Dark Up 70.5 285.6 Up 10:27:09 - 10:46:34 3702
Lake Havasu City 10:36:49 -49.4 Dark Up 70.2 286.7 Up 10:27:07 - 10:46:32 3680
Lone Pine 10:37:06 -51.6 Dark Up 73.6 280.4 Up 10:27:23 - 10:46:48 3673
Parker 10:36:48 -49.4 Dark Up 70.1 287.6 Up 10:27:06 - 10:46:31 3651
Blythe 10:36:48 -49.8 Dark Up 70.1 289.0 Up 10:27:06 - 10:46:31 3588
Yuma 10:36:46 -50.0 Dark Up 69.8 291.4 Up 10:27:04 - 10:46:29 3503
Calipatria 10:36:50 -50.7 Dark Up 70.7 290.5 Up 10:27:07 - 10:46:32 3493
Idyllwild 10:36:54 -51.5 Dark Up 71.8 289.2 Up 10:27:12 - 10:46:37 3484
CPSLO 10:37:09 -54.1 Dark Up 75.3 285.1 Up 10:27:27 - 10:46:52 3423
Wildwood 10:37:00 -52.9 Dark Up 73.4 288.7 Up 10:27:18 - 10:46:43 3417

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 315530, (2018/01/30 10:38UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 25.89  35
Merak          11:01:50.7 +56:22:57  2.4 21.17  52
21 LMi         10:07:25.9 +35:14:41  4.6  2.87  35
PPM 074943     10:02:56.1 +37:53:36  8.5  0.41  35
PPM 074932     10:01:55.8 +37:44:35  9.4  0.21  35
315530         10:00:55.9 +37:47:57 14.6        35
Positions are for J2000

Event circumstances last updated at 2016/10/09 17:24:32 UT

Marc W. Buie, Southwest Research Institute

RECON