RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star UC4-787-032536 with event index number of 105811

Geocentric closest approach at 2018/02/04 04:50:45 UTC

J2000 position of star is 20:55:57.2 +67:22:29
Equinox of date position of star is 20:56:10.5 +67:26:31
Stellar brightness R=12.5, use SENSEUP=16
Star is 102 degrees from the moon. Moon is 83% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 11.5 AU from the Sun and 11.5 AU from the Earth.
The TNO is moving 26.9 km/sec on the sky relative to the star, or, 11.6 arcsec/hr.
The 1-sigma error in the time of the event is 21 seconds.
The 1-sigma cross-track error in the shadow position is 975 km.
The sky-plane scale is 8356.7 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.1 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2018/02/04 04:51UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:03.0 +45:20:45  1.3 22.18 112
Alderamin      21:19:00.6 +62:39:45  2.4  5.35 107
7 Cep          21:28:06.9 +66:53:18  5.3  3.14 105
PPM 022547     21:01:48.4 +66:46:50  8.4  0.86 103
PPM 022473     20:55:27.7 +67:33:41  9.7  0.14 102
342842         20:56:11.0 +67:26:41 12.5       102
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 7.2 km RECON observability=0.7 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 04:51:43 -50.9 Dark Up 20.2 347.5 Low 04:49:29 - 04:53:56 6963
DCO 04:52:12 -46.9 Dark Up 16.8 345.1 Really Low 04:49:59 - 04:54:26 6813
Yuma 04:52:20 -46.2 Dark Down 14.8 344.8 Really Low 04:50:06 - 04:54:33 6788
Parker 04:52:16 -46.2 Dark Down 16.1 344.8 Really Low 04:50:03 - 04:54:30 6781
Patrick 04:52:13 -46.3 Dark Down 17.2 344.8 Really Low 04:50:00 - 04:54:27 6778
Blythe 04:52:18 -46.1 Dark Down 15.7 344.7 Really Low 04:50:04 - 04:54:31 6777
Lake Havasu City 04:52:15 -46.1 Dark Down 16.5 344.8 Really Low 04:50:01 - 04:54:28 6775
Kingman/Dolan Springs 04:52:14 -46.2 Dark Down 17.1 344.8 Really Low 04:50:01 - 04:54:28 6775
Mohave Valley 04:52:16 -45.8 Dark Down 16.9 344.7 Really Low 04:50:03 - 04:54:30 6758
Laughlin/Bullhead City 04:52:16 -45.8 Dark Down 17.2 344.6 Really Low 04:50:03 - 04:54:30 6753
Calipatria 04:52:21 -45.4 Dark Down 15.4 344.5 Really Low 04:50:08 - 04:54:35 6743
Searchlight/Boulder City 04:52:16 -45.4 Dark Down 17.5 344.5 Really Low 04:50:03 - 04:54:30 6734
Henderson 04:52:15 -45.2 Dark Down 18.1 344.4 Really Low 04:50:02 - 04:54:29 6720
Idyllwild 04:52:24 -44.4 Dark Down 16.2 344.1 Really Low 04:50:10 - 04:54:37 6684
Indian Springs 04:52:16 -44.6 Dark Down 18.8 344.1 Really Low 04:50:03 - 04:54:30 6681
Beatty 04:52:18 -43.6 Dark Down 19.3 343.7 Really Low 04:50:05 - 04:54:32 6629
Wildwood 04:52:28 -42.8 Dark Down 17.0 343.4 Really Low 04:50:14 - 04:54:41 6591
Tonopah 04:52:19 -43.0 Dark Down 20.5 343.5 Low 04:50:05 - 04:54:32 6587
Lone Pine 04:52:23 -42.7 Dark Down 19.3 343.4 Really Low 04:50:10 - 04:54:37 6577
Bishop 04:52:23 -42.3 Dark Down 20.1 343.2 Low 04:50:10 - 04:54:37 6548
Hawthorne 04:52:21 -41.8 Dark Down 21.3 343.0 Low 04:50:07 - 04:54:34 6515
Lee Vining 04:52:24 -41.6 Dark Down 20.9 342.9 Low 04:50:10 - 04:54:37 6504
Yerington 04:52:22 -41.3 Dark Down 21.8 342.7 Low 04:50:09 - 04:54:36 6481
CPSLO 04:52:31 -40.9 Dark Down 18.7 342.7 Really Low 04:50:18 - 04:54:45 6475
Gardnerville 04:52:24 -40.9 Dark Down 21.9 342.5 Low 04:50:10 - 04:54:37 6456
Carson City 04:52:23 -40.8 Dark Down 22.2 342.5 Low 04:50:09 - 04:54:36 6448
Reno 04:52:22 -40.7 Dark Down 22.5 342.4 Low 04:50:08 - 04:54:35 6440
Portola 04:52:24 -40.2 Dark Down 22.9 342.2 Low 04:50:10 - 04:54:37 6404
Susanville 04:52:23 -39.9 Dark Down 23.6 342.1 Low 04:50:10 - 04:54:37 6382
Quincy 04:52:25 -39.8 Dark Down 23.2 342.0 Low 04:50:11 - 04:54:38 6379
Gimple 04:52:24 -39.8 Dark Down 23.3 342.0 Low 04:50:10 - 04:54:37 6379
Cedarville 04:52:20 -39.9 Dark Down 24.5 342.1 Low 04:50:06 - 04:54:33 6378
Greenville 04:52:23 -39.7 Dark Down 23.4 342.0 Low 04:50:10 - 04:54:37 6375
Lakeview 04:52:19 -39.6 Dark Down 25.2 341.9 Low 04:50:05 - 04:54:32 6354
Fall River/Burney 04:52:24 -39.2 Dark Down 24.3 341.7 Low 04:50:10 - 04:54:37 6334
Paisley 04:52:19 -39.4 Dark Down 25.7 341.8 Low 04:50:05 - 04:54:32 6332
Tulelake 04:52:22 -38.9 Dark Down 25.2 341.6 Low 04:50:08 - 04:54:35 6309
PNWRO 04:52:09 -39.5 Dark Down 28.5 341.8 Low 04:49:55 - 04:54:22 6304
North Lake 04:52:18 -39.0 Dark Down 26.3 341.6 Low 04:50:05 - 04:54:32 6302
George/Umatilla 04:52:10 -39.2 Dark Down 28.5 341.7 Low 04:49:56 - 04:54:23 6289
Klamath Falls 04:52:22 -38.6 Dark Down 25.5 341.4 Low 04:50:08 - 04:54:35 6288
Pasco 04:52:09 -39.3 Dark Down 28.8 341.7 Low 04:49:55 - 04:54:22 6287
Chiloquin 04:52:22 -38.5 Dark Down 25.9 341.3 Low 04:50:09 - 04:54:36 6276
La Pine/Gilchrist 04:52:18 -38.4 Dark Down 26.9 341.3 Low 04:50:05 - 04:54:32 6264
Redmond 04:52:16 -38.5 Dark Down 27.3 341.3 Low 04:50:03 - 04:54:30 6262
Bend 04:52:17 -38.5 Dark Down 27.2 341.3 Low 04:50:04 - 04:54:31 6262
Oregon Observatory 04:52:19 -38.4 Dark Down 27.0 341.3 Low 04:50:06 - 04:54:33 6261
Madras/Culver 04:52:17 -38.4 Dark Down 27.7 341.3 Low 04:50:03 - 04:54:30 6254
Sisters 04:52:18 -38.2 Dark Down 27.5 341.2 Low 04:50:05 - 04:54:32 6243
Maupin 04:52:15 -38.3 Dark Down 28.2 341.2 Low 04:50:02 - 04:54:29 6239
Toppenish/White Swan 04:52:12 -38.4 Dark Down 29.2 341.2 Low 04:49:59 - 04:54:26 6231
Goldendale 04:52:13 -38.3 Dark Down 28.7 341.1 Low 04:50:00 - 04:54:27 6231
The Dalles 04:52:15 -38.1 Dark Down 28.6 341.1 Low 04:50:02 - 04:54:29 6222
Yakima 04:52:12 -38.2 Dark Down 29.4 341.1 Low 04:49:58 - 04:54:25 6217
Ellensburg 04:52:11 -38.1 Dark Down 29.8 341.0 Low 04:49:58 - 04:54:25 6205
Wenatchee 04:52:09 -38.1 Dark Down 30.1 341.0 Up 04:49:55 - 04:54:22 6200
Brewster 04:52:07 -38.2 Dark Down 30.7 341.1 Up 04:49:53 - 04:54:20 6198
Okanogan 04:52:06 -38.2 Dark Down 30.9 341.1 Up 04:49:53 - 04:54:20 6197
Entiat 04:52:09 -38.1 Dark Down 30.3 341.0 Up 04:49:55 - 04:54:22 6196
Manson/Chelan 04:52:09 -38.0 Dark Down 30.5 341.0 Up 04:49:55 - 04:54:22 6191
Tonasket 04:52:05 -38.2 Dark Down 31.2 341.1 Up 04:49:52 - 04:54:19 6191
Oroville 04:52:05 -38.1 Dark Down 31.4 341.1 Up 04:49:52 - 04:54:19 6182

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 342842, (2018/02/04 04:51UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 22.18 112
Alderamin      21:18:35.2 +62:35:09  2.4  5.35 107
7 Cep          21:27:46.1 +66:48:33  5.3  3.14 105
PPM 022547     21:01:32.3 +66:42:32  8.4  0.86 103
PPM 022473     20:55:14.2 +67:29:30  9.7  0.14 102
342842         20:55:57.2 +67:22:29 12.5       102
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:00:34 UT

Marc W. Buie, Southwest Research Institute

RECON