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 08:16:55.8 +18:37:13
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         07:46:28.6 +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 24.2 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 3004
Tonasket 08:08:49 -64.1 Dark Down 56.4 147.0 Up 07:53:49 - 08:23:49 2981
Okanogan 08:08:49 -64.4 Dark Down 56.7 146.5 Up 07:53:49 - 08:23:49 2947
Brewster 08:08:49 -64.7 Dark Down 56.8 145.9 Up 07:53:49 - 08:23:49 2918
Manson/Chelan 08:08:50 -64.9 Dark Down 56.9 145.1 Up 07:53:50 - 08:23:50 2895
Entiat 08:08:50 -65.2 Dark Down 57.0 144.8 Up 07:53:50 - 08:23:50 2872
Wenatchee 08:08:51 -65.4 Dark Down 57.2 144.5 Up 07:53:51 - 08:23:51 2846
Ellensburg 08:08:52 -65.8 Dark Down 57.4 143.7 Up 07:53:52 - 08:23:52 2803
Yakima 08:08:52 -66.2 Dark Down 57.7 143.3 Up 07:53:52 - 08:23:52 2762
Toppenish/White Swan 08:08:51 -66.5 Dark Down 58.0 143.4 Up 07:53:51 - 08:23:51 2742
Pasco 08:08:47 -66.5 Dark Down 58.6 145.3 Up 07:53:47 - 08:23:47 2740
PNWRO 08:08:46 -66.8 Dark Down 58.9 145.5 Up 07:53:46 - 08:23:46 2717
George/Umatilla 08:08:48 -66.9 Dark Down 58.8 144.7 Up 07:53:48 - 08:23:48 2704
Goldendale 08:08:52 -67.0 Dark Down 58.3 142.2 Up 07:53:52 - 08:23:52 2683
The Dalles 08:08:54 -67.2 Dark Down 58.3 141.4 Up 07:53:54 - 08:23:54 2658
Maupin 08:08:54 -67.7 Dark Down 58.6 141.1 Up 07:53:54 - 08:23:54 2616
Madras/Culver 08:08:54 -68.2 Dark Down 59.1 140.5 Up 07:53:54 - 08:23:54 2560
Redmond 08:08:54 -68.6 Dark Down 59.3 140.0 Up 07:53:54 - 08:23:54 2523
Sisters 08:08:56 -68.5 Dark Down 59.1 139.4 Up 07:53:56 - 08:23:56 2523
Bend 08:08:54 -68.8 Dark Down 59.4 139.6 Up 07:53:54 - 08:23:54 2500
Oregon Observatory 08:08:55 -68.9 Dark Down 59.5 139.2 Up 07:53:55 - 08:23:55 2482
La Pine/Gilchrist 08:08:55 -69.2 Dark Down 59.6 138.8 Up 07:53:55 - 08:23:55 2460
North Lake 08:08:54 -69.6 Dark Down 60.2 139.3 Up 07:53:54 - 08:23:54 2420
Paisley 08:08:52 -70.1 Dark Down 60.8 139.3 Up 07:53:52 - 08:23:52 2366
Chiloquin 08:08:56 -70.3 Dark Down 60.3 137.0 Up 07:53:56 - 08:23:56 2343
Lakeview 08:08:52 -70.6 Dark Down 61.3 139.0 Up 07:53:52 - 08:23:52 2315
Klamath Falls 08:08:56 -70.6 Dark Down 60.5 136.7 Up 07:53:56 - 08:23:56 2308
Niwot 08:08:01 -68.2 Dark Down 68.2 168.5 Up 07:53:01 - 08:23:01 2286
Tulelake 08:08:55 -70.9 Dark Down 60.9 136.9 Up 07:53:55 - 08:23:55 2282
Cedarville 08:08:51 -71.3 Dark Down 61.9 138.5 Up 07:53:51 - 08:23:51 2249
Fall River/Burney 08:08:56 -71.8 Dark Down 61.6 135.8 Up 07:53:56 - 08:23:56 2188
Susanville 08:08:53 -72.4 Dark Down 62.4 136.2 Up 07:53:53 - 08:23:53 2128
Gimple 08:08:54 -72.7 Dark Down 62.5 135.5 Up 07:53:54 - 08:23:54 2098
Greenville 08:08:54 -72.7 Dark Down 62.5 135.4 Up 07:53:54 - 08:23:54 2097
Quincy 08:08:54 -72.9 Dark Down 62.6 135.1 Up 07:53:54 - 08:23:54 2076
Portola 08:08:52 -73.0 Dark Down 63.0 135.7 Up 07:53:52 - 08:23:52 2066
Reno 08:08:50 -73.3 Dark Down 63.5 136.5 Up 07:53:50 - 08:23:50 2044
Carson City 08:08:50 -73.6 Dark Down 63.8 136.0 Up 07:53:50 - 08:23:50 2007
Yerington 08:08:48 -73.8 Dark Down 64.2 136.9 Up 07:53:48 - 08:23:48 1992
Gardnerville 08:08:50 -73.9 Dark Down 64.0 135.8 Up 07:53:50 - 08:23:50 1981
Hawthorne 08:08:46 -74.2 Dark Down 64.9 137.2 Up 07:53:46 - 08:23:46 1948
Tonopah 08:08:41 -74.4 Dark Down 65.9 139.1 Up 07:53:41 - 08:23:41 1913
Lee Vining 08:08:48 -74.8 Dark Down 65.0 135.4 Up 07:53:48 - 08:23:48 1883
Bishop 08:08:45 -75.3 Dark Down 65.8 135.9 Up 07:53:45 - 08:23:45 1827
Beatty 08:08:33 -75.5 Dark Down 67.0 138.2 Up 07:53:33 - 08:23:33 1803
Indian Springs 08:08:33 -75.5 Dark Down 67.8 139.9 Up 07:53:33 - 08:23:33 1774
Lone Pine 08:08:44 -76.0 Dark Down 66.6 135.3 Up 07:53:44 - 08:23:44 1750
Henderson 08:08:33 -75.8 Dark Down 68.6 140.5 Up 07:53:33 - 08:23:33 1724
Patrick 08:08:29 -76.0 Dark Down 69.7 142.0 Up 07:53:29 - 08:23:29 1671
Searchlight/Boulder City 08:08:33 -76.3 Dark Down 69.1 139.7 Up 07:53:33 - 08:23:33 1663
DCO 08:08:26 -75.9 Dark Down 70.3 143.1 Up 07:53:26 - 08:23:26 1647
Kingman/Dolan Springs 08:08:30 -76.2 Dark Down 69.7 141.2 Up 07:53:30 - 08:23:30 1645
Laughlin/Bullhead City 08:08:31 -76.4 Dark Down 69.5 140.0 Up 07:53:31 - 08:23:31 1636
Mohave Valley 08:08:31 -76.7 Dark Down 69.7 139.5 Up 07:53:31 - 08:23:31 1607
CPSLO 08:08:53 -77.5 Dark Down 65.9 128.4 Up 07:53:53 - 08:23:53 1586
Lake Havasu City 08:08:31 -76.9 Dark Down 70.1 139.4 Up 07:53:31 - 08:23:31 1567
Parker 08:08:30 -77.2 Dark Down 70.4 138.8 Up 07:53:30 - 08:23:30 1530
Wildwood 08:08:46 -78.5 Dark Down 67.9 129.9 Up 07:53:46 - 08:23:46 1476
Blythe 08:08:31 -77.8 Dark Down 70.7 137.1 Up 07:53:31 - 08:23:31 1470
Idyllwild 08:08:33 -78.4 Dark Down 69.3 132.8 Up 07:53:33 - 08:23:33 1465
Calipatria 08:08:33 -78.6 Dark Down 70.5 134.1 Up 07:53:33 - 08:23:33 1406
Yuma 08:08:31 -78.6 Dark Down 71.3 135.2 Up 07:53:31 - 08:23:31 1370

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 2017/12/05 19:09:50 UT

Marc W. Buie, Southwest Research Institute

RECON