RECON: TNO occultation with 69987

Event between (69987) 98WA25 and star UC4-558-011718 with event index number of 110412

Geocentric closest approach at 2018/01/30 04:55:04 UTC

J2000 position of star is 04:50:14.5 +21:31:59
Equinox of date position of star is 04:51:16.6 +21:33:42
Stellar brightness R=14.7, use SENSEUP=128
Star is 37 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=23.4

[RECON map]
TNO is 42.4 AU from the Sun and 41.8 AU from the Earth.
The TNO is moving 12.4 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 632 seconds.
The 1-sigma cross-track error in the shadow position is 2828 km.
The sky-plane scale is 30337.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 19.3 sec chord
Diameter=97.9 km assuming a 30% albedo -- 7.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 69987, (2018/01/30 04:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.6 +16:32:39  0.8  6.06  41
Alnath         05:27:26.2 +28:37:16  1.6 10.79  30
PPM 093742     04:46:48.1 +23:39:36  6.1  2.34  38
PPM 093789     04:49:48.4 +21:20:47  7.3  0.41  38
PPM 093815     04:51:52.8 +21:26:13 11.3  0.18  37
69987          04:51:19.2 +21:33:47 14.7        37
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 1.4 sigma about the mid-time.
The median site spacing is 25.1 km RECON observability=1.0 and success probability=5.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:53:43 -39.6 Dark Up 61.3 201.3 Up 04:38:43 - 05:08:43 7147
Tonasket 04:53:41 -39.6 Dark Up 61.5 201.4 Up 04:38:41 - 05:08:41 7124
Okanogan 04:53:43 -39.7 Dark Up 61.8 201.4 Up 04:38:43 - 05:08:43 7090
Brewster 04:53:45 -39.6 Dark Up 62.1 201.2 Up 04:38:45 - 05:08:45 7064
Manson/Chelan 04:53:46 -39.5 Dark Up 62.4 200.7 Up 04:38:46 - 05:08:46 7043
Entiat 04:53:46 -39.5 Dark Up 62.6 200.7 Up 04:38:46 - 05:08:46 7021
Wenatchee 04:53:47 -39.5 Dark Up 62.9 200.6 Up 04:38:47 - 05:08:47 6996
Ellensburg 04:53:49 -39.5 Dark Up 63.3 200.5 Up 04:38:49 - 05:08:49 6954
Yakima 04:53:48 -39.6 Dark Up 63.7 200.8 Up 04:38:48 - 05:08:48 6913
Toppenish/White Swan 04:53:47 -39.8 Dark Up 63.9 201.3 Up 04:38:47 - 05:08:47 6891
Pasco 04:53:39 -40.7 Dark Up 63.7 203.9 Up 04:38:39 - 05:08:39 6878
PNWRO 04:53:37 -40.9 Dark Up 63.8 204.5 Up 04:38:37 - 05:08:37 6852
George/Umatilla 04:53:41 -40.6 Dark Up 64.0 203.7 Up 04:38:41 - 05:08:41 6844
Goldendale 04:53:49 -39.7 Dark Up 64.5 200.8 Up 04:38:49 - 05:08:49 6836
The Dalles 04:53:52 -39.5 Dark Up 64.8 200.2 Up 04:38:52 - 05:08:52 6813
Maupin 04:53:50 -39.7 Dark Up 65.2 200.8 Up 04:38:50 - 05:08:50 6771
Madras/Culver 04:53:52 -39.8 Dark Up 65.7 201.1 Up 04:38:52 - 05:08:52 6715
Sisters 04:53:53 -39.6 Dark Up 66.1 200.4 Up 04:38:53 - 05:08:53 6681
Redmond 04:53:52 -39.9 Dark Up 66.0 201.3 Up 04:38:52 - 05:08:52 6678
Bend 04:53:52 -39.8 Dark Up 66.3 201.1 Up 04:38:52 - 05:08:52 6657
Oregon Observatory 04:53:52 -39.8 Dark Up 66.5 201.0 Up 04:38:52 - 05:08:52 6639
La Pine/Gilchrist 04:53:52 -39.8 Dark Up 66.7 201.0 Up 04:38:52 - 05:08:52 6618
North Lake 04:53:49 -40.3 Dark Up 66.9 202.7 Up 04:38:49 - 05:08:49 6572
Paisley 04:53:47 -40.7 Dark Up 67.3 204.1 Up 04:38:47 - 05:08:47 6514
Chiloquin 04:53:54 -39.8 Dark Up 67.8 201.2 Up 04:38:54 - 05:08:54 6503
Klamath Falls 04:53:55 -40.0 Dark Up 68.1 201.7 Up 04:38:55 - 05:08:55 6468
Lakeview 04:53:45 -41.0 Dark Up 67.7 205.0 Up 04:38:45 - 05:08:45 6461
Tulelake 04:53:52 -40.2 Dark Up 68.3 202.6 Up 04:38:52 - 05:08:52 6439
Cedarville 04:53:43 -41.2 Dark Up 68.3 206.1 Up 04:38:43 - 05:08:43 6392
Fall River/Burney 04:53:51 -40.5 Dark Up 69.1 203.7 Up 04:38:51 - 05:08:51 6343
Niwot 04:52:06 -52.1 Dark Up 62.0 235.8 Up 04:37:06 - 05:07:06 6282
Susanville 04:53:46 -41.2 Dark Up 69.4 206.2 Up 04:38:46 - 05:08:46 6276
Greenville 04:53:49 -41.0 Dark Up 69.8 205.9 Up 04:38:49 - 05:08:49 6247
Gimple 04:53:49 -41.1 Dark Up 69.7 206.1 Up 04:38:49 - 05:08:49 6247
Quincy 04:53:48 -41.0 Dark Up 70.0 206.1 Up 04:38:48 - 05:08:48 6226
Portola 04:53:46 -41.4 Dark Up 69.9 207.4 Up 04:38:46 - 05:08:46 6212
Reno 04:53:41 -42.0 Dark Up 69.9 209.3 Up 04:38:41 - 05:08:41 6183
Carson City 04:53:41 -42.0 Dark Up 70.2 209.9 Up 04:38:41 - 05:08:41 6145
Yerington 04:53:36 -42.6 Dark Up 70.1 211.7 Up 04:38:36 - 05:08:36 6123
Gardnerville 04:53:40 -42.1 Dark Up 70.4 210.3 Up 04:38:40 - 05:08:40 6119
Hawthorne 04:53:31 -43.0 Dark Up 70.3 213.6 Up 04:38:31 - 05:08:31 6074
Tonopah 04:53:23 -44.2 Dark Up 70.1 217.7 Up 04:38:23 - 05:08:23 6024
Lee Vining 04:53:36 -42.8 Dark Up 71.0 213.4 Up 04:38:36 - 05:08:36 6014
Bishop 04:53:31 -43.5 Dark Up 71.2 216.1 Up 04:38:31 - 05:08:31 5949
Beatty 04:53:19 -44.8 Dark Up 70.7 220.8 Up 04:38:19 - 05:08:19 5900
Lone Pine 04:53:27 -43.9 Dark Up 71.6 218.3 Up 04:38:27 - 05:08:27 5868
Indian Springs 04:53:10 -45.7 Dark Up 70.4 223.8 Up 04:38:10 - 05:08:10 5865
Henderson 04:53:06 -46.3 Dark Up 70.4 226.3 Up 04:38:06 - 05:08:06 5809
Searchlight/Boulder City 04:53:06 -46.5 Dark Up 70.8 227.7 Up 04:38:06 - 05:08:06 5747
Patrick 04:52:58 -47.3 Dark Up 70.2 229.9 Up 04:37:58 - 05:07:58 5743
CPSLO 04:53:46 -42.1 Dark Up 73.9 214.0 Up 04:38:46 - 05:08:46 5730
Kingman/Dolan Springs 04:52:58 -47.2 Dark Up 70.4 230.0 Up 04:37:58 - 05:07:58 5719
Laughlin/Bullhead City 04:53:02 -46.8 Dark Up 70.8 229.0 Up 04:38:02 - 05:08:02 5715
DCO 04:52:52 -47.9 Dark Up 69.9 231.9 Up 04:37:52 - 05:07:52 5712
Mohave Valley 04:53:02 -46.9 Dark Up 70.9 229.6 Up 04:38:02 - 05:08:02 5686
Lake Havasu City 04:53:00 -47.2 Dark Up 71.0 231.0 Up 04:38:00 - 05:08:00 5643
Parker 04:53:00 -47.3 Dark Up 71.2 231.9 Up 04:38:00 - 05:08:00 5605
Wildwood 04:53:31 -43.8 Dark Up 73.8 222.1 Up 04:38:31 - 05:08:31 5597
Idyllwild 04:53:17 -45.4 Dark Up 73.0 227.6 Up 04:38:17 - 05:08:17 5558
Blythe 04:53:02 -47.1 Dark Up 71.7 232.5 Up 04:38:02 - 05:08:02 5547
Calipatria 04:53:08 -46.5 Dark Up 72.7 231.8 Up 04:38:08 - 05:08:08 5492
Yuma 04:53:02 -47.2 Dark Up 72.3 234.7 Up 04:38:02 - 05:08:02 5447

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 69987, (2018/01/30 04:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  6.06  41
Alnath         05:26:17.5 +28:36:24  1.6 10.79  30
PPM 093742     04:45:42.5 +23:37:41  6.1  2.34  38
PPM 093789     04:48:43.8 +21:18:56  7.3  0.41  38
PPM 093815     04:50:48.2 +21:24:26 11.3  0.18  37
69987          04:50:14.5 +21:31:59 14.7        37
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:00:10 UT

Marc W. Buie, Southwest Research Institute

RECON