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 12:24:21 UTC

J2000 position of star is 05:38:07.2 +16:05:37
Equinox of date position of star is 05:39:07.3 +16:06:10
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 75 seconds.
The 1-sigma cross-track error in the shadow position is 872 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 12:24UT)
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 5.5 km RECON observability=1.0 and success probability=5.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:19:24 -7.8 CT Up 65.7 190.2 Up 12:12:39 - 12:26:10 -809
DCO 12:20:11 -14.4 AT Up 70.7 169.9 Up 12:13:25 - 12:26:56 -1600
Patrick 12:20:04 -15.0 AT Up 70.3 168.0 Up 12:13:19 - 12:26:50 -1656
Kingman/Dolan Springs 12:20:07 -15.1 AT Up 70.5 167.4 Up 12:13:22 - 12:26:53 -1678
Oroville 12:17:06 -16.9 AT Up 56.1 161.7 Up 12:10:21 - 12:23:52 -1698
Tonasket 12:17:09 -17.0 AT Up 56.3 161.7 Up 12:10:23 - 12:23:54 -1706
Lake Havasu City 12:20:16 -15.4 AT Up 71.1 166.3 Up 12:13:30 - 12:27:01 -1719
Laughlin/Bullhead City 12:20:07 -15.6 AT Up 70.4 165.9 Up 12:13:22 - 12:26:53 -1725
Parker 12:20:20 -15.4 AT Up 71.5 166.2 Up 12:13:34 - 12:27:05 -1726
Okanogan 12:17:12 -17.1 AT Up 56.6 161.3 Up 12:10:27 - 12:23:58 -1728
Mohave Valley 12:20:11 -15.6 AT Up 70.7 165.8 Up 12:13:25 - 12:26:56 -1731
Henderson 12:19:55 -15.8 AT Up 69.5 165.2 Up 12:13:09 - 12:26:40 -1738
Searchlight/Boulder City 12:20:02 -15.8 AT Up 70.1 165.1 Up 12:13:16 - 12:26:47 -1747
Brewster 12:17:15 -17.3 AT Up 56.8 160.8 Up 12:10:29 - 12:24:00 -1752
PNWRO 12:17:41 -17.2 AT Up 59.0 161.5 Up 12:10:56 - 12:24:27 -1758
Blythe 12:20:26 -15.7 AT Up 71.9 164.9 Up 12:13:40 - 12:27:11 -1766
Pasco 12:17:38 -17.3 AT Up 58.7 161.2 Up 12:10:52 - 12:24:23 -1766
Indian Springs 12:19:45 -16.3 AT Up 68.8 163.7 Up 12:12:59 - 12:26:30 -1784
Manson/Chelan 12:17:16 -17.6 AT Up 56.9 160.1 Up 12:10:31 - 12:24:02 -1785
Yuma 12:20:38 -15.8 AT Up 72.8 164.2 Up 12:13:53 - 12:27:24 -1794
George/Umatilla 12:17:41 -17.5 AT Up 59.0 160.6 Up 12:10:56 - 12:24:27 -1794
Entiat 12:17:17 -17.7 AT Up 57.1 159.8 Up 12:10:32 - 12:24:03 -1798
Wenatchee 12:17:21 -17.8 AT Up 57.3 159.6 Up 12:10:36 - 12:24:07 -1814
Ellensburg 12:17:25 -18.1 Dark Up 57.7 159.0 Up 12:10:40 - 12:24:11 -1845
Toppenish/White Swan 12:17:33 -18.1 Dark Up 58.3 158.9 Up 12:10:47 - 12:24:18 -1855
Yakima 12:17:30 -18.2 Dark Up 58.0 158.8 Up 12:10:45 - 12:24:16 -1860
Calipatria 12:20:31 -16.5 AT Up 72.2 161.7 Up 12:13:45 - 12:27:16 -1864
Beatty 12:19:38 -17.1 AT Up 68.2 161.1 Up 12:12:52 - 12:26:23 -1868
Tonopah 12:19:22 -17.4 AT Up 67.0 160.7 Up 12:12:36 - 12:26:07 -1873
Goldendale 12:17:39 -18.6 Dark Up 58.7 157.9 Up 12:10:53 - 12:24:24 -1906
The Dalles 12:17:41 -18.9 Dark Up 58.8 157.1 Up 12:10:56 - 12:24:27 -1941
Maupin 12:17:44 -18.9 Dark Up 59.2 157.1 Up 12:10:59 - 12:24:30 -1949
Idyllwild 12:20:16 -17.5 AT Up 71.3 158.7 Up 12:13:31 - 12:27:02 -1954
Madras/Culver 12:17:50 -19.0 Dark Up 59.7 156.7 Up 12:11:05 - 12:24:36 -1971
Hawthorne 12:19:11 -18.4 Dark Up 66.2 157.8 Up 12:12:26 - 12:25:57 -1978
Redmond 12:17:55 -19.2 Dark Up 60.0 156.4 Up 12:11:09 - 12:24:40 -1988
Lone Pine 12:19:39 -18.2 Dark Up 68.2 157.6 Up 12:12:54 - 12:26:25 -1989
Bishop 12:19:28 -18.4 Dark Up 67.3 157.4 Up 12:12:43 - 12:26:14 -1994
Paisley 12:18:15 -19.1 Dark Up 61.7 156.6 Up 12:11:30 - 12:25:01 -1995
Lakeview 12:18:23 -19.0 Dark Up 62.2 156.6 Up 12:11:38 - 12:25:09 -1997
North Lake 12:18:08 -19.2 Dark Up 61.1 156.2 Up 12:11:22 - 12:24:53 -2004
Cedarville 12:18:32 -19.0 Dark Up 62.9 156.6 Up 12:11:47 - 12:25:18 -2006
Bend 12:17:58 -19.3 Dark Up 60.2 156.0 Up 12:11:13 - 12:24:44 -2006
Yerington 12:19:04 -18.7 Dark Up 65.6 156.9 Up 12:12:19 - 12:25:50 -2007
Sisters 12:17:53 -19.4 Dark Up 59.9 155.6 Up 12:11:08 - 12:24:39 -2017
Oregon Observatory 12:17:59 -19.4 Dark Up 60.3 155.6 Up 12:11:13 - 12:24:44 -2023
La Pine/Gilchrist 12:18:01 -19.5 Dark Up 60.5 155.4 Up 12:11:15 - 12:24:46 -2034
Lee Vining 12:19:19 -18.9 Dark Up 66.5 156.2 Up 12:12:34 - 12:26:05 -2037
Reno 12:18:57 -19.1 Dark Up 64.9 155.9 Up 12:12:11 - 12:25:42 -2043
Carson City 12:19:01 -19.2 Dark Up 65.2 155.7 Up 12:12:15 - 12:25:46 -2054
Gardnerville 12:19:04 -19.2 Dark Up 65.4 155.6 Up 12:12:19 - 12:25:50 -2058
Susanville 12:18:43 -19.6 Dark Up 63.8 154.8 Up 12:11:58 - 12:25:29 -2082
Portola 12:18:51 -19.6 Dark Up 64.4 154.7 Up 12:12:06 - 12:25:37 -2088
Tulelake 12:18:22 -19.9 Dark Up 62.1 154.3 Up 12:11:36 - 12:25:07 -2094
Chiloquin 12:18:13 -20.0 Dark Up 61.4 154.0 Up 12:11:28 - 12:24:59 -2102
Klamath Falls 12:18:20 -20.0 Dark Up 61.7 153.9 Up 12:11:34 - 12:25:05 -2108
Gimple 12:18:46 -19.8 Dark Up 64.0 154.1 Up 12:12:00 - 12:25:31 -2109
Wildwood 12:20:09 -19.0 Dark Up 70.3 153.9 Up 12:13:24 - 12:26:55 -2112
Greenville 12:18:45 -19.9 Dark Up 63.9 153.9 Up 12:11:59 - 12:25:30 -2116
Fall River/Burney 12:18:33 -20.0 Dark Up 62.9 153.7 Up 12:11:48 - 12:25:19 -2120
Quincy 12:18:48 -19.9 Dark Up 64.1 153.8 Up 12:12:03 - 12:25:34 -2122
CPSLO 12:19:47 -20.5 Dark Up 68.4 150.0 Up 12:13:02 - 12:26:33 -2254

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 12:24UT)
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 2017/05/19 18:03:52 UT

Marc W. Buie, Southwest Research Institute

RECON