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 12:23:31 UTC

J2000 position of star is 05:38:07.2 +16:05:37
Equinox of date position of star is 05:39:09.9 +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 65 seconds.
The 1-sigma cross-track error in the shadow position is 670 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 5.9 km RECON observability=1.0 and success probability=0.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:18:37 -8.0 CT Up 65.7 189.8 Up 12:12:44 - 12:24:29 -1398
DCO 12:19:24 -14.6 AT Up 70.7 169.4 Up 12:13:31 - 12:25:16 -2191
Patrick 12:19:19 -15.1 AT Up 70.3 167.5 Up 12:13:27 - 12:25:12 -2246
Kingman/Dolan Springs 12:19:20 -15.3 AT Up 70.5 166.8 Up 12:13:28 - 12:25:13 -2269
Oroville 12:16:18 -17.0 AT Up 56.0 161.4 Up 12:10:25 - 12:22:10 -2280
Tonasket 12:16:21 -17.1 AT Up 56.2 161.3 Up 12:10:29 - 12:22:14 -2288
Okanogan 12:16:26 -17.3 AT Up 56.5 160.9 Up 12:10:33 - 12:22:18 -2310
Lake Havasu City 12:19:30 -15.6 AT Up 71.1 165.7 Up 12:13:38 - 12:25:23 -2310
Laughlin/Bullhead City 12:19:18 -15.7 AT Up 70.4 165.3 Up 12:13:25 - 12:25:10 -2315
Parker 12:19:33 -15.6 AT Up 71.5 165.6 Up 12:13:41 - 12:25:26 -2317
Mohave Valley 12:19:22 -15.7 AT Up 70.7 165.2 Up 12:13:29 - 12:25:14 -2322
Henderson 12:19:06 -16.0 AT Up 69.5 164.7 Up 12:13:14 - 12:24:59 -2328
Brewster 12:16:27 -17.5 AT Up 56.7 160.5 Up 12:10:35 - 12:22:20 -2334
Searchlight/Boulder City 12:19:13 -16.0 AT Up 70.0 164.5 Up 12:13:21 - 12:25:06 -2338
PNWRO 12:16:54 -17.3 AT Up 58.9 161.1 Up 12:11:02 - 12:22:47 -2341
Pasco 12:16:50 -17.4 AT Up 58.7 160.8 Up 12:10:58 - 12:22:43 -2350
Blythe 12:19:39 -15.9 AT Up 71.9 164.4 Up 12:13:47 - 12:25:32 -2358
Manson/Chelan 12:16:28 -17.7 AT Up 56.9 159.7 Up 12:10:35 - 12:22:20 -2367
Indian Springs 12:18:58 -16.5 AT Up 68.8 163.2 Up 12:13:06 - 12:24:51 -2373
George/Umatilla 12:16:54 -17.7 AT Up 58.9 160.3 Up 12:11:02 - 12:22:47 -2377
Entiat 12:16:31 -17.8 AT Up 57.1 159.5 Up 12:10:38 - 12:22:23 -2380
Yuma 12:19:50 -16.0 AT Up 72.8 163.6 Up 12:13:57 - 12:25:42 -2386
Wenatchee 12:16:33 -18.0 AT Up 57.3 159.2 Up 12:10:41 - 12:22:26 -2396
Ellensburg 12:16:37 -18.2 Dark Up 57.6 158.6 Up 12:10:45 - 12:22:30 -2427
Toppenish/White Swan 12:16:46 -18.3 Dark Up 58.2 158.6 Up 12:10:53 - 12:22:38 -2438
Yakima 12:16:43 -18.3 Dark Up 58.0 158.4 Up 12:10:51 - 12:22:36 -2443
Calipatria 12:19:44 -16.7 AT Up 72.1 161.1 Up 12:13:52 - 12:25:37 -2455
Beatty 12:18:52 -17.3 AT Up 68.2 160.6 Up 12:12:59 - 12:24:44 -2457
Tonopah 12:18:34 -17.5 AT Up 67.0 160.3 Up 12:12:42 - 12:24:27 -2462
Goldendale 12:16:52 -18.7 Dark Up 58.6 157.6 Up 12:10:59 - 12:22:44 -2490
The Dalles 12:16:53 -19.0 Dark Up 58.7 156.8 Up 12:11:01 - 12:22:46 -2525
Maupin 12:16:59 -19.0 Dark Up 59.2 156.7 Up 12:11:06 - 12:22:51 -2532
Idyllwild 12:19:32 -17.6 AT Up 71.2 158.2 Up 12:13:40 - 12:25:25 -2545
Madras/Culver 12:17:05 -19.2 Dark Up 59.7 156.3 Up 12:11:12 - 12:22:57 -2555
Hawthorne 12:18:25 -18.5 Dark Up 66.1 157.3 Up 12:12:32 - 12:24:17 -2566
Redmond 12:17:09 -19.3 Dark Up 60.0 156.0 Up 12:11:16 - 12:23:01 -2572
Lone Pine 12:18:52 -18.4 Dark Up 68.1 157.1 Up 12:12:59 - 12:24:44 -2578
Paisley 12:17:29 -19.2 Dark Up 61.6 156.2 Up 12:11:36 - 12:23:21 -2580
Bishop 12:18:40 -18.5 Dark Up 67.3 156.9 Up 12:12:47 - 12:24:32 -2583
Lakeview 12:17:35 -19.2 Dark Up 62.2 156.3 Up 12:11:43 - 12:23:28 -2583
North Lake 12:17:21 -19.3 Dark Up 61.0 155.9 Up 12:11:29 - 12:23:14 -2588
Bend 12:17:11 -19.4 Dark Up 60.1 155.6 Up 12:11:18 - 12:23:03 -2591
Cedarville 12:17:44 -19.2 Dark Up 62.8 156.2 Up 12:11:51 - 12:23:36 -2592
Yerington 12:18:19 -18.9 Dark Up 65.5 156.5 Up 12:12:26 - 12:24:11 -2595
Sisters 12:17:07 -19.6 Dark Up 59.8 155.3 Up 12:11:15 - 12:23:00 -2601
Oregon Observatory 12:17:13 -19.6 Dark Up 60.3 155.3 Up 12:11:20 - 12:23:05 -2607
La Pine/Gilchrist 12:17:15 -19.7 Dark Up 60.4 155.0 Up 12:11:22 - 12:23:07 -2619
Lee Vining 12:18:31 -19.0 Dark Up 66.5 155.7 Up 12:12:38 - 12:24:23 -2625
Reno 12:18:09 -19.3 Dark Up 64.8 155.5 Up 12:12:16 - 12:24:01 -2631
Carson City 12:18:13 -19.3 Dark Up 65.1 155.2 Up 12:12:21 - 12:24:06 -2641
Gardnerville 12:18:16 -19.3 Dark Up 65.4 155.1 Up 12:12:24 - 12:24:09 -2645
Susanville 12:17:56 -19.7 Dark Up 63.7 154.4 Up 12:12:03 - 12:23:48 -2669
Portola 12:18:04 -19.7 Dark Up 64.3 154.3 Up 12:12:11 - 12:23:56 -2675
Tulelake 12:17:35 -20.0 Dark Up 62.0 153.9 Up 12:11:43 - 12:23:28 -2680
Chiloquin 12:17:27 -20.2 Dark Up 61.3 153.6 Up 12:11:34 - 12:23:19 -2687
Klamath Falls 12:17:31 -20.2 Dark Up 61.7 153.5 Up 12:11:39 - 12:23:24 -2693
Gimple 12:17:59 -20.0 Dark Up 63.9 153.7 Up 12:12:07 - 12:23:52 -2696
Greenville 12:17:58 -20.0 Dark Up 63.9 153.5 Up 12:12:06 - 12:23:51 -2702
Wildwood 12:19:23 -19.1 Dark Up 70.2 153.3 Up 12:13:30 - 12:25:15 -2702
Fall River/Burney 12:17:46 -20.2 Dark Up 62.9 153.3 Up 12:11:54 - 12:23:39 -2706
Quincy 12:18:01 -20.1 Dark Up 64.0 153.4 Up 12:12:08 - 12:23:53 -2709
CPSLO 12:18:59 -20.7 Dark Up 68.3 149.5 Up 12:13:06 - 12:24:51 -2844

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 2018/02/09 17:10:17 UT

Marc W. Buie, Southwest Research Institute

RECON