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 03:27:11 UTC

J2000 position of star is 17:18:25.1 -02:05:14
Equinox of date position of star is 17:19:21.1 -02:06:18
Stellar brightness R=15.3, use SENSEUP=128
Star is 85 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=20.0

[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 204 seconds.
The 1-sigma cross-track error in the shadow position is 2824 km.
The sky-plane scale is 33825.2 km/arcsec.

The TNO has an absolute magnitude Hv=3.2
Diameter=1380.4 km assuming a 5% albedo -- 127.2 sec chord
Diameter=563.6 km assuming a 30% albedo -- 51.9 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 4.4 sigma about the mid-time.
The median site spacing is 23.2 km RECON observability=0.3 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)
Niwot 03:22:19 -23.2 Dark Down 37.1 225.8 Up 03:07:19 - 03:37:19 -1730
DCO 03:22:47 -19.6 Dark Down 45.0 220.0 Up 03:07:47 - 03:37:47 -2253
Patrick 03:22:44 -19.0 Dark Down 45.1 218.9 Up 03:07:44 - 03:37:44 -2311
Kingman/Dolan Springs 03:22:41 -18.9 Dark Down 45.4 218.8 Up 03:07:41 - 03:37:41 -2324
Parker 03:22:53 -19.1 Dark Down 46.3 219.3 Up 03:07:53 - 03:37:53 -2338
Lake Havasu City 03:22:48 -19.0 Dark Down 46.1 219.0 Up 03:07:48 - 03:37:48 -2342
Blythe 03:22:58 -19.1 Dark Down 46.9 219.3 Up 03:07:58 - 03:37:58 -2361
Yuma 03:23:02 -19.4 Dark Down 47.6 219.9 Up 03:08:02 - 03:38:02 -2361
Mohave Valley 03:22:42 -18.6 Dark Down 45.9 218.4 Up 03:07:42 - 03:37:42 -2363
Laughlin/Bullhead City 03:22:42 -18.5 Dark Down 45.7 218.2 Up 03:07:42 - 03:37:42 -2365
Searchlight/Boulder City 03:22:39 -18.1 Dark Down 45.6 217.6 Up 03:07:39 - 03:37:39 -2394
Henderson 03:22:31 -17.9 AT Down 45.2 217.1 Up 03:07:31 - 03:37:31 -2401
Calipatria 03:22:59 -18.5 Dark Down 47.7 218.5 Up 03:07:59 - 03:37:59 -2435
Indian Springs 03:22:26 -17.1 AT Down 45.1 215.9 Up 03:07:26 - 03:37:26 -2459
Idyllwild 03:22:49 -17.4 AT Down 47.9 216.5 Up 03:07:49 - 03:37:49 -2534
Beatty 03:22:21 -16.2 AT Down 45.4 214.3 Up 03:07:21 - 03:37:21 -2545
Tonopah 03:22:11 -15.4 AT Down 44.6 213.0 Up 03:07:11 - 03:37:11 -2585
Lone Pine 03:22:23 -15.3 AT Down 46.2 212.8 Up 03:07:23 - 03:37:23 -2648
Bishop 03:22:12 -14.8 AT Down 45.7 211.9 Up 03:07:12 - 03:37:12 -2676
Wildwood 03:22:42 -15.7 AT Down 48.5 213.7 Up 03:07:42 - 03:37:42 -2690
Hawthorne 03:22:04 -14.2 AT Down 44.8 211.0 Up 03:07:04 - 03:37:04 -2698
Lee Vining 03:22:09 -14.0 AT Down 45.5 210.6 Up 03:07:09 - 03:37:09 -2735
Yerington 03:21:58 -13.7 AT Down 44.7 210.0 Up 03:06:58 - 03:36:58 -2741
PNWRO 03:21:04 -11.4 CT Down 38.5 207.1 Up 03:06:04 - 03:36:04 -2760
Pasco 03:21:04 -11.2 CT Down 38.3 206.7 Up 03:06:04 - 03:36:04 -2779
Gardnerville 03:21:58 -13.2 AT Down 44.9 209.3 Up 03:06:58 - 03:36:58 -2787
George/Umatilla 03:21:06 -11.2 CT Down 38.7 206.6 Up 03:06:06 - 03:36:06 -2791
Carson City 03:21:57 -13.1 AT Down 44.7 209.1 Up 03:06:57 - 03:36:57 -2791
Reno 03:21:55 -13.0 AT Down 44.4 208.9 Up 03:06:55 - 03:36:55 -2794
Tonasket 03:20:48 -10.1 CT Down 36.2 205.4 Up 03:05:48 - 03:35:48 -2823
Oroville 03:20:42 -10.0 CT Down 36.0 205.3 Up 03:05:42 - 03:35:42 -2825
Cedarville 03:21:37 -12.1 AT Down 42.8 207.4 Up 03:06:37 - 03:36:37 -2827
Okanogan 03:20:46 -10.1 CT Down 36.6 205.4 Up 03:05:46 - 03:35:46 -2829
Brewster 03:20:48 -10.1 CT Down 36.9 205.2 Up 03:05:48 - 03:35:48 -2840
Lakeview 03:21:30 -11.7 CT Down 42.3 206.9 Up 03:06:30 - 03:36:30 -2843
Portola 03:21:51 -12.4 AT Down 44.4 207.9 Up 03:06:51 - 03:36:51 -2846
CPSLO 03:22:30 -13.7 AT Down 48.4 210.1 Up 03:07:30 - 03:37:30 -2859
Paisley 03:21:30 -11.4 CT Down 41.9 206.4 Up 03:06:30 - 03:36:30 -2860
Susanville 03:21:44 -12.1 AT Down 44.0 207.3 Up 03:06:44 - 03:36:44 -2861
Manson/Chelan 03:20:48 -9.9 CT Down 37.2 204.8 Up 03:05:48 - 03:35:48 -2863
Entiat 03:20:50 -10.0 CT Down 37.4 204.8 Up 03:05:50 - 03:35:50 -2866
Toppenish/White Swan 03:20:59 -10.3 CT Down 38.6 205.1 Up 03:05:59 - 03:35:59 -2868
Wenatchee 03:20:52 -10.0 CT Down 37.7 204.8 Up 03:05:52 - 03:35:52 -2872
Gimple 03:21:46 -12.0 AT Down 44.3 207.2 Up 03:06:46 - 03:36:46 -2877
Yakima 03:21:02 -10.1 CT Down 38.5 204.8 Up 03:06:02 - 03:36:02 -2882
Quincy 03:21:50 -12.0 AT Down 44.5 207.2 Up 03:06:50 - 03:36:50 -2883
Ellensburg 03:20:57 -10.0 CT Down 38.1 204.7 Up 03:05:57 - 03:35:57 -2883
Greenville 03:21:44 -12.0 CT Down 44.3 207.1 Up 03:06:44 - 03:36:44 -2884
North Lake 03:21:23 -11.0 CT Down 41.6 205.7 Up 03:06:23 - 03:36:23 -2888
Goldendale 03:21:02 -10.2 CT Down 39.2 204.8 Up 03:06:02 - 03:36:02 -2895
Maupin 03:21:06 -10.2 CT Down 39.9 204.7 Up 03:06:06 - 03:36:06 -2911
Madras/Culver 03:21:12 -10.4 CT Down 40.4 204.9 Up 03:06:12 - 03:36:12 -2911
Redmond 03:21:13 -10.5 CT Down 40.7 204.9 Up 03:06:13 - 03:36:13 -2913
Fall River/Burney 03:21:37 -11.3 CT Down 43.7 206.0 Up 03:06:37 - 03:36:37 -2920
The Dalles 03:21:04 -10.0 CT Down 39.5 204.4 Up 03:06:04 - 03:36:04 -2920
Bend 03:21:19 -10.5 CT Down 41.0 204.9 Up 03:06:19 - 03:36:19 -2923
Tulelake 03:21:30 -11.0 CT Down 42.9 205.5 Up 03:06:30 - 03:36:30 -2928
Oregon Observatory 03:21:16 -10.4 CT Down 41.2 204.8 Up 03:06:16 - 03:36:16 -2931
La Pine/Gilchrist 03:21:19 -10.4 CT Down 41.4 204.8 Up 03:06:19 - 03:36:19 -2935
Sisters 03:21:16 -10.2 CT Down 40.8 204.4 Up 03:06:16 - 03:36:16 -2943
Klamath Falls 03:21:28 -10.7 CT Down 42.8 205.0 Up 03:06:28 - 03:36:28 -2951
Chiloquin 03:21:27 -10.5 CT Down 42.5 204.8 Up 03:06:27 - 03:36:27 -2959

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 -26:25:56  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     17:18:39.1 -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 2017/12/05 18:55:57 UT

Marc W. Buie, Southwest Research Institute

RECON