RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star UC4-531-015806 with event index number of 155222

Geocentric closest approach at 2018/09/30 12:24:31 UTC

J2000 position of star is 05:38:07.2 +16:05:37
Equinox of date position of star is 05:39:09.2 +16:06:11
Stellar brightness R=15.5, use SENSEUP=128
Star is 12 degrees from the moon. Moon is 71% illuminated.
TNO apparent brightness V=20.2

[RECON map]
TNO is 11.3 AU from the Sun and 11.0 AU from the Earth.
The TNO is moving 8.0 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 105 seconds.
The 1-sigma cross-track error in the shadow position is 1327 km.
The sky-plane scale is 7976.7 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 10.4 sec chord
Diameter=34.0 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 281371, (2018/09/30 12:25UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:11.2 +07:24:33  0.4  9.64  20
Bellatrix      05:26:08.2 +06:21:55  1.6 10.25  15
126 Tau        05:42:22.7 +16:32:31  4.6  0.88  13
PPM 121200     05:38:58.1 +15:55:33  8.3  0.19  12
281371         05:39:12.1 +16:06:12 15.5        12
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 5.9 km RECON observability=1.0 and success probability=6.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:19:35 -7.8 CT Up 65.7 190.3 Up 12:10:22 - 12:28:49 -882
DCO 12:20:22 -14.4 AT Up 70.7 170.1 Up 12:11:08 - 12:29:35 -1673
Patrick 12:20:16 -14.9 AT Up 70.3 168.2 Up 12:11:03 - 12:29:30 -1729
Kingman/Dolan Springs 12:20:19 -15.1 AT Up 70.5 167.5 Up 12:11:05 - 12:29:32 -1751
Oroville 12:17:17 -16.9 AT Up 56.1 161.8 Up 12:08:04 - 12:26:31 -1767
Tonasket 12:17:19 -16.9 AT Up 56.3 161.7 Up 12:08:06 - 12:26:33 -1775
Lake Havasu City 12:20:27 -15.4 AT Up 71.2 166.4 Up 12:11:13 - 12:29:40 -1793
Okanogan 12:17:23 -17.1 AT Up 56.6 161.3 Up 12:08:09 - 12:26:36 -1797
Laughlin/Bullhead City 12:20:16 -15.5 AT Up 70.4 166.0 Up 12:11:03 - 12:29:30 -1798
Parker 12:20:30 -15.4 AT Up 71.5 166.3 Up 12:11:17 - 12:29:44 -1799
Mohave Valley 12:20:20 -15.5 AT Up 70.7 165.9 Up 12:11:06 - 12:29:33 -1804
Henderson 12:20:04 -15.8 AT Up 69.5 165.3 Up 12:10:51 - 12:29:18 -1811
Searchlight/Boulder City 12:20:13 -15.8 AT Up 70.1 165.2 Up 12:10:59 - 12:29:26 -1820
Brewster 12:17:27 -17.3 AT Up 56.8 160.9 Up 12:08:14 - 12:26:41 -1821
PNWRO 12:17:53 -17.2 AT Up 59.0 161.6 Up 12:08:40 - 12:27:07 -1827
Pasco 12:17:50 -17.3 AT Up 58.7 161.3 Up 12:08:36 - 12:27:03 -1836
Blythe 12:20:39 -15.7 AT Up 72.0 165.1 Up 12:11:25 - 12:29:52 -1840
Manson/Chelan 12:17:28 -17.6 AT Up 56.9 160.2 Up 12:08:15 - 12:26:42 -1854
Indian Springs 12:19:57 -16.3 AT Up 68.8 163.8 Up 12:10:43 - 12:29:10 -1856
George/Umatilla 12:17:53 -17.5 AT Up 59.0 160.7 Up 12:08:39 - 12:27:06 -1864
Entiat 12:17:31 -17.7 AT Up 57.1 159.9 Up 12:08:17 - 12:26:44 -1867
Yuma 12:20:50 -15.8 AT Up 72.9 164.3 Up 12:11:36 - 12:30:03 -1867
Wenatchee 12:17:32 -17.8 AT Up 57.3 159.6 Up 12:08:19 - 12:26:46 -1883
Ellensburg 12:17:37 -18.1 Dark Up 57.7 159.1 Up 12:08:23 - 12:26:50 -1914
Toppenish/White Swan 12:17:45 -18.1 Dark Up 58.3 159.0 Up 12:08:31 - 12:26:58 -1925
Yakima 12:17:41 -18.2 Dark Up 58.0 158.8 Up 12:08:28 - 12:26:55 -1930
Calipatria 12:20:42 -16.5 AT Up 72.2 161.9 Up 12:11:29 - 12:29:56 -1937
Beatty 12:19:50 -17.1 AT Up 68.3 161.2 Up 12:10:36 - 12:29:03 -1941
Tonopah 12:19:34 -17.3 AT Up 67.0 160.9 Up 12:10:20 - 12:28:47 -1945
Goldendale 12:17:49 -18.5 Dark Up 58.7 158.0 Up 12:08:35 - 12:27:02 -1976
The Dalles 12:17:52 -18.8 Dark Up 58.8 157.2 Up 12:08:38 - 12:27:05 -2011
Maupin 12:17:57 -18.8 Dark Up 59.2 157.2 Up 12:08:44 - 12:27:11 -2018
Idyllwild 12:20:31 -17.4 AT Up 71.3 158.9 Up 12:11:18 - 12:29:45 -2027
Madras/Culver 12:18:03 -19.0 Dark Up 59.7 156.8 Up 12:08:50 - 12:27:17 -2041
Hawthorne 12:19:24 -18.4 Dark Up 66.2 157.9 Up 12:10:11 - 12:28:38 -2050
Redmond 12:18:07 -19.1 Dark Up 60.1 156.5 Up 12:08:54 - 12:27:21 -2058
Lone Pine 12:19:50 -18.2 Dark Up 68.2 157.7 Up 12:10:36 - 12:29:03 -2061
Paisley 12:18:27 -19.0 Dark Up 61.7 156.7 Up 12:09:14 - 12:27:41 -2066
Bishop 12:19:39 -18.3 Dark Up 67.3 157.5 Up 12:10:26 - 12:28:53 -2067
Lakeview 12:18:34 -19.0 Dark Up 62.2 156.7 Up 12:09:20 - 12:27:47 -2068
North Lake 12:18:20 -19.2 Dark Up 61.1 156.3 Up 12:09:06 - 12:27:33 -2074
Bend 12:18:09 -19.3 Dark Up 60.2 156.1 Up 12:08:56 - 12:27:23 -2076
Cedarville 12:18:44 -19.0 Dark Up 62.9 156.7 Up 12:09:31 - 12:27:58 -2077
Yerington 12:19:17 -18.7 Dark Up 65.6 157.0 Up 12:10:03 - 12:28:30 -2079
Sisters 12:18:06 -19.4 Dark Up 59.9 155.7 Up 12:08:52 - 12:27:19 -2087
Oregon Observatory 12:18:11 -19.4 Dark Up 60.3 155.7 Up 12:08:58 - 12:27:25 -2093
La Pine/Gilchrist 12:18:13 -19.5 Dark Up 60.5 155.5 Up 12:08:59 - 12:27:26 -2105
Lee Vining 12:19:29 -18.8 Dark Up 66.6 156.3 Up 12:10:15 - 12:28:42 -2109
Reno 12:19:07 -19.1 Dark Up 64.9 156.0 Up 12:09:54 - 12:28:21 -2115
Carson City 12:19:12 -19.1 Dark Up 65.2 155.8 Up 12:09:58 - 12:28:25 -2125
Gardnerville 12:19:15 -19.2 Dark Up 65.4 155.7 Up 12:10:01 - 12:28:28 -2129
Susanville 12:18:55 -19.6 Dark Up 63.8 154.9 Up 12:09:41 - 12:28:08 -2154
Portola 12:19:02 -19.5 Dark Up 64.4 154.8 Up 12:09:49 - 12:28:16 -2159
Tulelake 12:18:34 -19.9 Dark Up 62.1 154.4 Up 12:09:20 - 12:27:47 -2165
Chiloquin 12:18:26 -20.0 Dark Up 61.4 154.0 Up 12:09:12 - 12:27:39 -2172
Klamath Falls 12:18:30 -20.0 Dark Up 61.8 154.0 Up 12:09:16 - 12:27:43 -2179
Gimple 12:18:58 -19.8 Dark Up 64.0 154.2 Up 12:09:45 - 12:28:12 -2180
Wildwood 12:20:20 -19.0 Dark Up 70.3 154.0 Up 12:11:06 - 12:29:33 -2185
Greenville 12:18:57 -19.8 Dark Up 63.9 154.0 Up 12:09:44 - 12:28:11 -2187
Fall River/Burney 12:18:45 -20.0 Dark Up 63.0 153.8 Up 12:09:31 - 12:27:58 -2191
Quincy 12:18:59 -19.9 Dark Up 64.1 153.9 Up 12:09:46 - 12:28:13 -2194
CPSLO 12:20:00 -20.5 Dark Up 68.4 150.1 Up 12:10:47 - 12:29:14 -2327

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 281371, (2018/09/30 12:25UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  9.64  20
Bellatrix      05:25:07.8 +06:20:58  1.6 10.25  15
126 Tau        05:41:17.7 +16:32:02  4.6  0.88  13
PPM 121200     05:37:53.3 +15:54:57  8.3  0.19  12
281371         05:38:07.2 +16:05:37 15.5        12
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:58:12 UT

Marc W. Buie, Southwest Research Institute

RECON