RECON: TNO occultation with 50000

Event between (50000) Quaoar and star UC4-373-116977 with event index number of 110296

Geocentric closest approach at 2018/03/16 11:14:40 UTC

J2000 position of star is 18:07:17.1 -15:32:31
Equinox of date position of star is 18:08:17.7 -15:32:19
Stellar brightness R=16.3, use SENSEUP=128
Star is 72 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=18.9

[RECON map]
TNO is 42.9 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 9.3 km/sec on the sky relative to the star, or, 1.1 arcsec/hr.
The 1-sigma error in the time of the event is 236 seconds.
The 1-sigma cross-track error in the shadow position is 1906 km.
The sky-plane scale is 31181.6 km/arcsec.

The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 215.1 sec chord
Diameter=814.6 km assuming a 30% albedo -- 87.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 50000, (2018/03/16 11:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:31.6 -26:28:15  0.9 25.24  93
35Eta Oph      17:11:25.4 -15:44:46  2.6 13.70  85
PPM 234067     18:08:51.7 -17:09:01  5.3  1.62  72
PPM 234043     18:07:36.8 -14:58:12  8.2  0.59  72
PPM 234061     18:08:19.0 -15:33:11  9.5  0.01  72
50000          18:08:19.8 -15:32:19 16.3        72
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 3.8 sigma about the mid-time.
The median site spacing is 11.9 km RECON observability=0.3 and success probability=1.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 11:14:08 -28.1 Dark Down 12.4 132.1 Really Low 10:59:08 - 11:29:08 3811
Tonasket 11:14:03 -28.2 Dark Down 12.6 132.1 Really Low 10:59:03 - 11:29:03 3807
Okanogan 11:14:01 -28.5 Dark Down 12.7 131.9 Really Low 10:59:01 - 11:29:01 3801
Brewster 11:13:57 -28.7 Dark Down 12.8 131.7 Really Low 10:58:57 - 11:28:57 3797
Manson/Chelan 11:13:51 -29.1 Dark Down 12.8 131.3 Really Low 10:58:51 - 11:28:51 3796
Entiat 11:13:49 -29.2 Dark Down 12.9 131.2 Really Low 10:58:49 - 11:28:49 3792
Wenatchee 11:13:47 -29.4 Dark Down 13.0 131.1 Really Low 10:58:47 - 11:28:47 3787
Ellensburg 11:13:42 -29.8 Dark Down 13.1 130.8 Really Low 10:58:42 - 11:28:42 3780
Yakima 11:13:40 -30.1 Dark Down 13.4 130.7 Really Low 10:58:40 - 11:28:40 3770
Toppenish/White Swan 11:13:38 -30.1 Dark Down 13.6 130.8 Really Low 10:58:38 - 11:28:38 3763
Goldendale 11:13:31 -30.7 Dark Down 13.7 130.3 Really Low 10:58:31 - 11:28:31 3753
The Dalles 11:13:26 -31.0 Dark Down 13.6 129.9 Really Low 10:58:26 - 11:28:26 3750
Pasco 11:13:42 -29.4 Dark Down 14.3 131.8 Really Low 10:58:42 - 11:28:42 3748
George/Umatilla 11:13:38 -29.7 Dark Down 14.4 131.6 Really Low 10:58:38 - 11:28:38 3742
PNWRO 11:13:43 -29.4 Dark Down 14.6 132.0 Really Low 10:58:43 - 11:28:43 3740
Maupin 11:13:23 -31.2 Dark Down 14.0 129.9 Really Low 10:58:23 - 11:28:23 3739
Madras/Culver 11:13:16 -31.5 Dark Down 14.3 129.8 Really Low 10:58:16 - 11:28:16 3724
Sisters 11:13:12 -32.0 Dark Down 14.2 129.3 Really Low 10:58:12 - 11:28:12 3719
Redmond 11:13:15 -31.8 Dark Down 14.5 129.7 Really Low 10:58:15 - 11:28:15 3715
Bend 11:13:09 -32.0 Dark Down 14.5 129.5 Really Low 10:58:09 - 11:28:09 3710
Oregon Observatory 11:13:10 -32.2 Dark Down 14.6 129.3 Really Low 10:58:10 - 11:28:10 3707
La Pine/Gilchrist 11:13:06 -32.3 Dark Down 14.7 129.2 Really Low 10:58:06 - 11:28:06 3701
North Lake 11:13:08 -32.2 Dark Down 15.3 129.6 Really Low 10:58:08 - 11:28:08 3683
Chiloquin 11:12:54 -33.2 Dark Down 15.1 128.7 Really Low 10:57:54 - 11:27:54 3671
Paisley 11:13:01 -32.3 Dark Down 15.8 129.8 Really Low 10:58:01 - 11:28:01 3663
Klamath Falls 11:12:52 -33.3 Dark Down 15.4 128.7 Really Low 10:57:52 - 11:27:52 3659
Tulelake 11:12:50 -33.3 Dark Down 15.7 128.8 Really Low 10:57:50 - 11:27:50 3648
Lakeview 11:13:01 -32.4 Dark Down 16.2 129.8 Really Low 10:58:01 - 11:28:01 3645
Cedarville 11:12:54 -32.7 Dark Down 16.7 129.8 Really Low 10:57:54 - 11:27:54 3621
Fall River/Burney 11:12:47 -33.7 Dark Down 16.3 128.7 Really Low 10:57:47 - 11:27:47 3616
Susanville 11:12:42 -33.6 Dark Down 17.1 129.1 Really Low 10:57:42 - 11:27:42 3587
Greenville 11:12:40 -34.0 Dark Down 17.1 128.8 Really Low 10:57:40 - 11:27:40 3580
Gimple 11:12:40 -33.9 Dark Down 17.2 128.9 Really Low 10:57:40 - 11:27:40 3579
Quincy 11:12:36 -34.1 Dark Down 17.3 128.8 Really Low 10:57:36 - 11:27:36 3573
Portola 11:12:38 -33.8 Dark Down 17.6 129.1 Really Low 10:57:38 - 11:27:38 3564
Reno 11:12:39 -33.5 Dark Down 18.2 129.6 Really Low 10:57:39 - 11:27:39 3547
Carson City 11:12:36 -33.7 Dark Down 18.4 129.5 Really Low 10:57:36 - 11:27:36 3534
Gardnerville 11:12:34 -33.8 Dark Down 18.6 129.4 Really Low 10:57:34 - 11:27:34 3524
Yerington 11:12:40 -33.3 Dark Down 18.9 130.0 Really Low 10:57:40 - 11:27:40 3519
Hawthorne 11:12:37 -33.2 Dark Down 19.5 130.2 Really Low 10:57:37 - 11:27:37 3495
Lee Vining 11:12:29 -33.8 Dark Down 19.6 129.7 Really Low 10:57:29 - 11:27:29 3479
Tonopah 11:12:44 -32.4 Dark Down 20.7 131.3 Low 10:57:44 - 11:27:44 3460
Bishop 11:12:32 -33.6 Dark Down 20.4 130.1 Low 10:57:32 - 11:27:32 3446
Lone Pine 11:12:24 -33.7 Dark Down 21.1 130.1 Low 10:57:24 - 11:27:24 3410
Beatty 11:12:40 -32.6 Dark Down 21.7 131.3 Low 10:57:40 - 11:27:40 3406
CPSLO 11:11:58 -36.3 Dark Down 20.2 127.6 Low 10:56:58 - 11:26:58 3382
Indian Springs 11:12:43 -32.0 Dark Down 22.6 132.1 Low 10:57:43 - 11:27:43 3377
Henderson 11:12:41 -31.7 Dark Down 23.4 132.5 Low 10:57:41 - 11:27:41 3343
Niwot 11:14:31 -22.7 Dark Down 25.8 142.8 Low 10:59:31 - 11:29:31 3333
Searchlight/Boulder City 11:12:38 -31.9 Dark Down 23.8 132.3 Low 10:57:38 - 11:27:38 3317
Wildwood 11:12:01 -35.3 Dark Down 22.3 128.8 Low 10:57:01 - 11:27:01 3304
Patrick 11:12:44 -31.1 Dark Down 24.5 133.2 Low 10:57:44 - 11:27:44 3298
Laughlin/Bullhead City 11:12:40 -31.7 Dark Down 24.2 132.5 Low 10:57:40 - 11:27:40 3297
Kingman/Dolan Springs 11:12:42 -31.3 Dark Down 24.5 133.0 Low 10:57:42 - 11:27:42 3291
Mohave Valley 11:12:37 -31.9 Dark Down 24.4 132.4 Low 10:57:37 - 11:27:37 3285
DCO 11:12:51 -30.7 Dark Down 25.1 133.7 Low 10:57:51 - 11:27:51 3273
Idyllwild 11:12:12 -34.0 Dark Down 23.8 130.2 Low 10:57:12 - 11:27:12 3263
Lake Havasu City 11:12:35 -31.8 Dark Down 24.8 132.5 Low 10:57:35 - 11:27:35 3262
Parker 11:12:31 -32.0 Dark Down 25.0 132.4 Low 10:57:31 - 11:27:31 3245
Blythe 11:12:27 -32.4 Dark Down 25.2 132.0 Low 10:57:27 - 11:27:27 3225
Calipatria 11:12:15 -33.3 Dark Down 24.9 131.0 Low 10:57:15 - 11:27:15 3215
Yuma 11:12:19 -32.8 Dark Down 25.8 131.6 Low 10:57:19 - 11:27:19 3180

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 50000, (2018/03/16 11:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.24  93
35Eta Oph      17:10:22.7 -15:43:29  2.6 13.70  85
PPM 234067     18:07:48.2 -17:09:14  5.3  1.62  72
PPM 234043     18:06:34.3 -14:58:23  8.2  0.59  72
PPM 234061     18:07:16.2 -15:33:24  9.5  0.01  72
50000          18:07:17.1 -15:32:31 16.3        72
Positions are for J2000

Event circumstances last updated at 2017/08/01 16:34:59 UT

Marc W. Buie, Southwest Research Institute

RECON