RECON: TNO occultation with 174567

Event between (174567) Varda and star UC4-440-067774 with event index number of 154895

Geocentric closest approach at 2018/09/10 03:27:05 UTC

J2000 position of star is 17:18:25.1 -02:05:14
Equinox of date position of star is 17:19:17.7 -02:06:15
Stellar brightness R=15.3
Star is 85 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=20.1

[RECON map]
TNO is 46.7 AU from the Sun and 46.6 AU from the Earth.
The TNO is moving 10.9 km/sec on the sky relative to the star, or, 1.2 arcsec/hr.
The 1-sigma error in the time of the event is 190 seconds.
The 1-sigma cross-track error in the shadow position is 2506 km.
The sky-plane scale is 33825.3 km/arcsec.

The TNO has an absolute magnitude Hv=3.3
Diameter=1318.3 km assuming a 5% albedo -- 121.4 sec chord
Diameter=538.2 km assuming a 30% albedo -- 49.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 174567, (2018/09/10 03:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:33.4 -26:28:19  0.9 27.04  77
60Bet Oph      17:44:23.8 +04:33:39  2.8  9.14  90
PPM 180059     17:26:56.1 -01:40:00  6.4  1.94  87
PPM 180033     17:19:37.3 -01:31:41  8.4  0.58  85
PPM 200551     17:20:12.5 -02:36:55  9.8  0.55  85
PPM 180032     17:19:34.4 -01:56:46 10.1  0.17  85
174567         17:19:23.5 -02:06:21 15.3        85
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 4.7 sigma about the mid-time.
The median site spacing is 23.3 km RECON observability=0.3 and success probability=8.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 03:22:08 -23.1 Dark Down 37.1 225.8 Up 03:07:08 - 03:37:08 -1880
DCO 03:22:34 -19.6 Dark Down 45.0 219.9 Up 03:07:34 - 03:37:34 -2402
Patrick 03:22:35 -18.9 Dark Down 45.2 218.9 Up 03:07:35 - 03:37:35 -2459
Kingman/Dolan Springs 03:22:34 -18.9 Dark Down 45.4 218.8 Up 03:07:34 - 03:37:34 -2473
Parker 03:22:41 -19.1 Dark Down 46.4 219.2 Up 03:07:41 - 03:37:41 -2487
Lake Havasu City 03:22:37 -18.9 Dark Down 46.1 218.9 Up 03:07:37 - 03:37:37 -2491
Blythe 03:22:46 -19.0 Dark Down 46.9 219.2 Up 03:07:46 - 03:37:46 -2509
Yuma 03:22:54 -19.4 Dark Down 47.6 219.9 Up 03:07:54 - 03:37:54 -2510
Mohave Valley 03:22:34 -18.6 Dark Down 45.9 218.4 Up 03:07:34 - 03:37:34 -2513
Laughlin/Bullhead City 03:22:30 -18.5 Dark Down 45.7 218.2 Up 03:07:30 - 03:37:30 -2514
Searchlight/Boulder City 03:22:26 -18.1 Dark Down 45.7 217.5 Up 03:07:26 - 03:37:26 -2543
Henderson 03:22:26 -17.8 AT Down 45.2 217.1 Up 03:07:26 - 03:37:26 -2550
Calipatria 03:22:49 -18.5 Dark Down 47.8 218.4 Up 03:07:49 - 03:37:49 -2584
Indian Springs 03:22:20 -17.1 AT Down 45.2 215.9 Up 03:07:20 - 03:37:20 -2607
Idyllwild 03:22:40 -17.3 AT Down 47.9 216.4 Up 03:07:40 - 03:37:40 -2681
Beatty 03:22:14 -16.2 AT Down 45.4 214.3 Up 03:07:14 - 03:37:14 -2694
Tonopah 03:22:04 -15.4 AT Down 44.7 213.0 Up 03:07:04 - 03:37:04 -2734
Lone Pine 03:22:14 -15.3 AT Down 46.2 212.8 Up 03:07:14 - 03:37:14 -2796
Bishop 03:22:07 -14.8 AT Down 45.7 211.9 Up 03:07:07 - 03:37:07 -2825
Wildwood 03:22:37 -15.7 AT Down 48.5 213.7 Up 03:07:37 - 03:37:37 -2838
Hawthorne 03:21:58 -14.2 AT Down 44.9 210.9 Up 03:06:58 - 03:36:58 -2847
Lee Vining 03:22:00 -14.0 AT Down 45.5 210.6 Up 03:07:00 - 03:37:00 -2884
Yerington 03:21:54 -13.6 AT Down 44.7 210.0 Up 03:06:54 - 03:36:54 -2890
PNWRO 03:20:55 -11.4 CT Down 38.5 207.0 Up 03:05:55 - 03:35:55 -2912
Pasco 03:20:53 -11.1 CT Down 38.3 206.7 Up 03:05:53 - 03:35:53 -2930
Gardnerville 03:21:48 -13.2 AT Down 45.0 209.2 Up 03:06:48 - 03:36:48 -2936
Carson City 03:21:48 -13.1 AT Down 44.8 209.0 Up 03:06:48 - 03:36:48 -2940
Reno 03:21:47 -13.0 AT Down 44.4 208.8 Up 03:06:47 - 03:36:47 -2943
George/Umatilla 03:20:57 -11.1 CT Down 38.7 206.5 Up 03:05:57 - 03:35:57 -2943
Tonasket 03:20:34 -10.1 CT Down 36.3 205.4 Up 03:05:34 - 03:35:34 -2974
Cedarville 03:21:31 -12.1 AT Down 42.9 207.4 Up 03:06:31 - 03:36:31 -2976
Oroville 03:20:34 -10.0 CT Down 36.1 205.3 Up 03:05:34 - 03:35:34 -2977
Okanogan 03:20:39 -10.1 CT Down 36.6 205.3 Up 03:05:39 - 03:35:39 -2981
Brewster 03:20:41 -10.1 CT Down 36.9 205.2 Up 03:05:41 - 03:35:41 -2992
Lakeview 03:21:20 -11.7 CT Down 42.3 206.8 Up 03:06:20 - 03:36:20 -2993
Portola 03:21:44 -12.4 AT Down 44.5 207.8 Up 03:06:44 - 03:36:44 -2994
CPSLO 03:22:16 -13.7 AT Down 48.4 210.0 Up 03:07:16 - 03:37:16 -3008
Paisley 03:21:18 -11.4 CT Down 42.0 206.4 Up 03:06:18 - 03:36:18 -3009
Susanville 03:21:38 -12.1 AT Down 44.0 207.3 Up 03:06:38 - 03:36:38 -3010
Manson/Chelan 03:20:41 -9.9 CT Down 37.2 204.8 Up 03:05:41 - 03:35:41 -3015
Entiat 03:20:44 -9.9 CT Down 37.4 204.8 Up 03:05:44 - 03:35:44 -3018
Toppenish/White Swan 03:20:53 -10.3 CT Down 38.6 205.1 Up 03:05:53 - 03:35:53 -3020
Wenatchee 03:20:41 -10.0 CT Down 37.7 204.7 Up 03:05:41 - 03:35:41 -3023
Quincy 03:21:39 -12.0 CT Down 44.5 207.1 Up 03:06:39 - 03:36:39 -3032
Greenville 03:21:39 -11.9 CT Down 44.3 207.0 Up 03:06:39 - 03:36:39 -3032
Yakima 03:20:51 -10.1 CT Down 38.5 204.8 Up 03:05:51 - 03:35:51 -3033
Ellensburg 03:20:45 -10.0 CT Down 38.1 204.6 Up 03:05:45 - 03:35:45 -3035
North Lake 03:21:14 -11.0 CT Down 41.6 205.7 Up 03:06:14 - 03:36:14 -3038
Goldendale 03:20:52 -10.2 CT Down 39.3 204.7 Up 03:05:52 - 03:35:52 -3047
Madras/Culver 03:21:05 -10.4 CT Down 40.4 204.8 Up 03:06:05 - 03:36:05 -3061
Maupin 03:20:59 -10.2 CT Down 39.9 204.7 Up 03:05:59 - 03:35:59 -3061
Redmond 03:21:09 -10.5 CT Down 40.7 204.9 Up 03:06:09 - 03:36:09 -3063
Fall River/Burney 03:21:32 -11.3 CT Down 43.7 206.0 Up 03:06:32 - 03:36:32 -3069
The Dalles 03:20:57 -10.0 CT Down 39.6 204.4 Up 03:05:57 - 03:35:57 -3071
Bend 03:21:07 -10.4 CT Down 41.0 204.8 Up 03:06:07 - 03:36:07 -3072
Tulelake 03:21:23 -11.0 CT Down 42.9 205.5 Up 03:06:23 - 03:36:23 -3077
Oregon Observatory 03:21:09 -10.4 CT Down 41.2 204.7 Up 03:06:09 - 03:36:09 -3081
La Pine/Gilchrist 03:21:06 -10.4 CT Down 41.4 204.7 Up 03:06:06 - 03:36:06 -3085
Sisters 03:21:05 -10.2 CT Down 40.8 204.4 Up 03:06:05 - 03:36:05 -3092
Klamath Falls 03:21:20 -10.7 CT Down 42.8 205.0 Up 03:06:20 - 03:36:20 -3101
Chiloquin 03:21:16 -10.5 CT Down 42.5 204.7 Up 03:06:16 - 03:36:16 -3108
Gimple 03:17:42 35.3 Sun up Up 2.7 278.6 Really Low 03:02:42 - 03:32:42 -7334

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 174567, (2018/09/10 03:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 27.04  77
60Bet Oph      17:43:28.3 +04:34:05  2.8  9.14  90
PPM 180059     17:25:58.0 -01:39:06  6.4  1.94  87
PPM 180033     17:18:39.2 -01:30:35  8.4  0.58  85
PPM 200551     17:19:13.9 -02:35:49  9.8  0.55  85
PPM 180032     17:18:36.1 -01:55:40 10.1  0.17  85
174567         17:18:25.1 -02:05:14 15.3        85
Positions are for J2000

Event circumstances last updated at 2016/11/02 17:52:49 UT

Marc W. Buie, Southwest Research Institute

RECON