RECON: TNO occultation with 01XR254

Event between 01XR254 and star UC4-544-045429 with event index number of 168625

Geocentric closest approach at 2019/01/03 08:07:24 UTC

J2000 position of star is 08:15:54.0 +18:40:35
Equinox of date position of star is 08:16:52.6 +18:37:24
Stellar brightness R=16.0, use SENSEUP=128
Star is 130 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 43.9 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 24.1 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 509 seconds.
The 1-sigma cross-track error in the shadow position is 3307 km.
The sky-plane scale is 31185.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.8
Diameter=416.9 km assuming a 5% albedo -- 17.3 sec chord
Diameter=170.2 km assuming a 30% albedo -- 7.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 01XR254, (2019/01/03 08:07UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:28.7 +27:58:44  1.1 11.69 138
16Zet2Cnc      08:13:18.1 +17:35:22  5.2  1.35 131
PPM 125077     08:18:01.9 +17:52:26  8.5  0.78 130
PPM 125076     08:18:01.1 +18:01:10  9.4  0.65 130
PPM 125056     08:17:08.5 +18:38:18 10.4  0.04 130
01XR254        08:16:59.5 +18:37:01 16.0       130
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 1.8 sigma about the mid-time.
The median site spacing is 23.8 km RECON observability=1.0 and success probability=12.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:08:48 -63.9 Dark Down 56.2 147.2 Up 07:53:48 - 08:23:48 3006
Tonasket 08:08:48 -64.1 Dark Down 56.4 147.0 Up 07:53:48 - 08:23:48 2983
Okanogan 08:08:48 -64.4 Dark Down 56.7 146.5 Up 07:53:48 - 08:23:48 2949
Brewster 08:08:49 -64.7 Dark Down 56.8 145.9 Up 07:53:49 - 08:23:49 2921
Manson/Chelan 08:08:50 -64.9 Dark Down 56.9 145.1 Up 07:53:50 - 08:23:50 2897
Entiat 08:08:50 -65.2 Dark Down 57.0 144.8 Up 07:53:50 - 08:23:50 2875
Wenatchee 08:08:50 -65.4 Dark Down 57.2 144.5 Up 07:53:50 - 08:23:50 2849
Ellensburg 08:08:51 -65.8 Dark Down 57.4 143.7 Up 07:53:51 - 08:23:51 2806
Yakima 08:08:51 -66.2 Dark Down 57.7 143.3 Up 07:53:51 - 08:23:51 2765
Toppenish/White Swan 08:08:51 -66.5 Dark Down 58.0 143.4 Up 07:53:51 - 08:23:51 2744
Pasco 08:08:47 -66.5 Dark Down 58.6 145.3 Up 07:53:47 - 08:23:47 2742
PNWRO 08:08:46 -66.8 Dark Down 58.9 145.5 Up 07:53:46 - 08:23:46 2720
George/Umatilla 08:08:48 -66.9 Dark Down 58.8 144.7 Up 07:53:48 - 08:23:48 2707
Goldendale 08:08:52 -67.0 Dark Down 58.3 142.2 Up 07:53:52 - 08:23:52 2686
The Dalles 08:08:53 -67.2 Dark Down 58.3 141.4 Up 07:53:53 - 08:23:53 2660
Maupin 08:08:53 -67.7 Dark Down 58.6 141.1 Up 07:53:53 - 08:23:53 2618
Madras/Culver 08:08:53 -68.2 Dark Down 59.1 140.5 Up 07:53:53 - 08:23:53 2563
Redmond 08:08:54 -68.6 Dark Down 59.3 140.0 Up 07:53:54 - 08:23:54 2526
Sisters 08:08:55 -68.5 Dark Down 59.1 139.4 Up 07:53:55 - 08:23:55 2525
Bend 08:08:54 -68.8 Dark Down 59.4 139.6 Up 07:53:54 - 08:23:54 2503
Oregon Observatory 08:08:55 -68.9 Dark Down 59.5 139.2 Up 07:53:55 - 08:23:55 2484
La Pine/Gilchrist 08:08:55 -69.2 Dark Down 59.6 138.8 Up 07:53:55 - 08:23:55 2463
North Lake 08:08:53 -69.6 Dark Down 60.2 139.3 Up 07:53:53 - 08:23:53 2423
Paisley 08:08:52 -70.1 Dark Down 60.8 139.3 Up 07:53:52 - 08:23:52 2369
Chiloquin 08:08:56 -70.3 Dark Down 60.3 137.0 Up 07:53:56 - 08:23:56 2346
Lakeview 08:08:52 -70.6 Dark Down 61.3 139.0 Up 07:53:52 - 08:23:52 2318
Klamath Falls 08:08:56 -70.6 Dark Down 60.5 136.7 Up 07:53:56 - 08:23:56 2311
Niwot 08:08:00 -68.2 Dark Down 68.2 168.5 Up 07:53:00 - 08:23:00 2292
Tulelake 08:08:55 -70.9 Dark Down 60.9 136.9 Up 07:53:55 - 08:23:55 2285
Cedarville 08:08:51 -71.3 Dark Down 61.9 138.5 Up 07:53:51 - 08:23:51 2252
Fall River/Burney 08:08:55 -71.8 Dark Down 61.6 135.8 Up 07:53:55 - 08:23:55 2191
Susanville 08:08:53 -72.4 Dark Down 62.4 136.2 Up 07:53:53 - 08:23:53 2131
Gimple 08:08:54 -72.7 Dark Down 62.5 135.5 Up 07:53:54 - 08:23:54 2100
Greenville 08:08:54 -72.7 Dark Down 62.5 135.4 Up 07:53:54 - 08:23:54 2100
Quincy 08:08:53 -72.9 Dark Down 62.6 135.1 Up 07:53:53 - 08:23:53 2079
Portola 08:08:52 -73.0 Dark Down 63.0 135.7 Up 07:53:52 - 08:23:52 2070
Reno 08:08:50 -73.3 Dark Down 63.5 136.5 Up 07:53:50 - 08:23:50 2047
Carson City 08:08:49 -73.6 Dark Down 63.8 136.0 Up 07:53:49 - 08:23:49 2010
Yerington 08:08:48 -73.8 Dark Down 64.2 136.9 Up 07:53:48 - 08:23:48 1995
Gardnerville 08:08:49 -73.9 Dark Down 64.0 135.8 Up 07:53:49 - 08:23:49 1984
Hawthorne 08:08:46 -74.2 Dark Down 64.9 137.2 Up 07:53:46 - 08:23:46 1951
Tonopah 08:08:33 -74.4 Dark Down 65.9 139.1 Up 07:53:33 - 08:23:33 1925
Lee Vining 08:08:47 -74.8 Dark Down 65.0 135.4 Up 07:53:47 - 08:23:47 1887
Bishop 08:08:45 -75.3 Dark Down 65.8 135.8 Up 07:53:45 - 08:23:45 1831
Beatty 08:08:33 -75.5 Dark Down 67.0 138.2 Up 07:53:33 - 08:23:33 1804
Indian Springs 08:08:33 -75.5 Dark Down 67.8 139.9 Up 07:53:33 - 08:23:33 1777
Lone Pine 08:08:43 -76.0 Dark Down 66.6 135.3 Up 07:53:43 - 08:23:43 1753
Henderson 08:08:32 -75.8 Dark Down 68.6 140.5 Up 07:53:32 - 08:23:32 1727
Patrick 08:08:28 -76.0 Dark Down 69.7 142.0 Up 07:53:28 - 08:23:28 1675
Searchlight/Boulder City 08:08:32 -76.3 Dark Down 69.1 139.7 Up 07:53:32 - 08:23:32 1667
DCO 08:08:25 -75.9 Dark Down 70.3 143.1 Up 07:53:25 - 08:23:25 1651
Kingman/Dolan Springs 08:08:29 -76.2 Dark Down 69.7 141.2 Up 07:53:29 - 08:23:29 1649
Laughlin/Bullhead City 08:08:31 -76.4 Dark Down 69.5 140.0 Up 07:53:31 - 08:23:31 1640
Mohave Valley 08:08:31 -76.7 Dark Down 69.7 139.5 Up 07:53:31 - 08:23:31 1610
CPSLO 08:08:53 -77.5 Dark Down 65.9 128.4 Up 07:53:53 - 08:23:53 1589
Lake Havasu City 08:08:29 -76.9 Dark Down 70.1 139.4 Up 07:53:29 - 08:23:29 1571
Parker 08:08:29 -77.2 Dark Down 70.4 138.8 Up 07:53:29 - 08:23:29 1534
Wildwood 08:08:45 -78.5 Dark Down 67.9 129.8 Up 07:53:45 - 08:23:45 1479
Blythe 08:08:30 -77.8 Dark Down 70.6 137.1 Up 07:53:30 - 08:23:30 1474
Idyllwild 08:08:33 -78.4 Dark Down 69.3 132.8 Up 07:53:33 - 08:23:33 1466
Calipatria 08:08:33 -78.6 Dark Down 70.5 134.1 Up 07:53:33 - 08:23:33 1409
Yuma 08:08:30 -78.6 Dark Down 71.3 135.2 Up 07:53:30 - 08:23:30 1374

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 01XR254, (2019/01/03 08:07UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 11.69 138
16Zet2Cnc      08:12:12.9 +17:38:51  5.2  1.35 131
PPM 125077     08:16:56.7 +17:56:01  8.5  0.78 130
PPM 125076     08:16:55.9 +18:04:45  9.4  0.65 130
PPM 125056     08:16:02.9 +18:41:52 10.4  0.04 130
01XR254        08:15:54.0 +18:40:35 16.0       130
Positions are for J2000

Event circumstances last updated at 2017/01/01 19:09:46 UT

Marc W. Buie, Southwest Research Institute

RECON