RECON: TNO occultation with 248835

Event between (248835) 06SX368 and star UC4-660-017724 with event index number of 109882

Geocentric closest approach at 2018/03/12 05:16:06 UTC

J2000 position of star is 03:38:55.6 +41:54:20
Equinox of date position of star is 03:40:08.3 +41:57:47
Stellar brightness R=14.6, use SENSEUP=128
Star is 127 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 15.0 AU from the Sun and 15.3 AU from the Earth.
The TNO is moving 22.1 km/sec on the sky relative to the star, or, 7.2 arcsec/hr.
The 1-sigma error in the time of the event is 426 seconds.
The 1-sigma cross-track error in the shadow position is 5846 km.
The sky-plane scale is 11103.9 km/arcsec.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 3.4 sec chord
Diameter=31.0 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 248835, (2018/03/12 05:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:58.0 +16:32:40  0.8 28.19 138
Algol          03:09:21.6 +41:01:28  2.1  5.84 121
PPM 046386     03:39:14.4 +42:38:29  6.2  0.70 126
PPM 046433     03:42:03.6 +41:53:57  8.2  0.36 127
PPM 046417     03:40:39.9 +41:44:40  8.8  0.24 127
248835         03:40:09.4 +41:57:50 14.6       127
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 2.1 sigma about the mid-time.
The median site spacing is 5.4 km RECON observability=1.0 and success probability=3.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 05:18:19 -45.4 Dark Down 25.8 304.2 Low 05:03:19 - 05:33:19 7544
Oroville 05:17:49 -31.9 Dark Down 39.0 292.3 Up 05:02:49 - 05:32:49 7018
Tonasket 05:17:50 -32.0 Dark Down 38.9 292.4 Up 05:02:50 - 05:32:50 7012
Okanogan 05:17:52 -32.1 Dark Down 38.9 292.6 Up 05:02:52 - 05:32:52 6996
Brewster 05:17:53 -32.2 Dark Down 38.9 292.7 Up 05:02:53 - 05:32:53 6979
PNWRO 05:18:02 -34.0 Dark Down 37.5 294.7 Up 05:03:02 - 05:33:02 6970
Pasco 05:18:02 -33.7 Dark Down 37.7 294.4 Up 05:03:02 - 05:33:02 6964
Manson/Chelan 05:17:54 -32.1 Dark Down 39.0 292.7 Up 05:02:54 - 05:32:54 6954
DCO 05:18:46 -44.0 Dark Down 28.2 303.3 Low 05:03:46 - 05:33:46 6946
Entiat 05:17:55 -32.2 Dark Down 39.0 292.8 Up 05:02:55 - 05:32:55 6944
George/Umatilla 05:18:03 -33.8 Dark Down 37.7 294.5 Up 05:03:03 - 05:33:03 6943
Wenatchee 05:17:56 -32.3 Dark Down 38.9 292.9 Up 05:02:56 - 05:32:56 6932
Patrick 05:18:46 -43.4 Dark Down 28.9 302.9 Low 05:03:46 - 05:33:46 6915
Ellensburg 05:17:58 -32.4 Dark Down 38.9 293.1 Up 05:02:58 - 05:32:58 6909
Toppenish/White Swan 05:18:01 -32.9 Dark Down 38.6 293.7 Up 05:03:01 - 05:33:01 6900
Yakima 05:18:00 -32.7 Dark Down 38.8 293.4 Up 05:03:00 - 05:33:00 6897
Kingman/Dolan Springs 05:18:47 -43.4 Dark Down 28.9 303.0 Low 05:03:47 - 05:33:47 6895
Henderson 05:18:44 -42.3 Dark Down 30.0 302.3 Low 05:03:44 - 05:33:44 6871
Laughlin/Bullhead City 05:18:47 -43.0 Dark Down 29.2 302.8 Low 05:03:47 - 05:33:47 6863
Goldendale 05:18:04 -33.0 Dark Down 38.6 293.9 Up 05:03:04 - 05:33:04 6860
Searchlight/Boulder City 05:18:46 -42.6 Dark Down 29.6 302.6 Low 05:03:46 - 05:33:46 6853
Mohave Valley 05:18:48 -43.2 Dark Down 29.1 303.0 Low 05:03:48 - 05:33:48 6853
Lake Havasu City 05:18:50 -43.6 Dark Down 28.7 303.2 Low 05:03:50 - 05:33:50 6853
Indian Springs 05:18:42 -41.5 Dark Down 30.7 301.8 Up 05:03:42 - 05:33:42 6849
Parker 05:18:51 -43.8 Dark Down 28.5 303.4 Low 05:03:51 - 05:33:51 6841
The Dalles 05:18:05 -32.9 Dark Down 38.7 293.9 Up 05:03:05 - 05:33:05 6834
Maupin 05:18:06 -33.2 Dark Down 38.5 294.2 Up 05:03:06 - 05:33:06 6827
Tonopah 05:18:37 -39.6 Dark Down 32.6 300.4 Up 05:03:37 - 05:33:37 6811
Madras/Culver 05:18:09 -33.5 Dark Down 38.3 294.6 Up 05:03:09 - 05:33:09 6807
Blythe 05:18:53 -43.9 Dark Down 28.4 303.5 Low 05:03:53 - 05:33:53 6802
Beatty 05:18:42 -40.6 Dark Down 31.7 301.2 Up 05:03:42 - 05:33:42 6796
Redmond 05:18:10 -33.7 Dark Down 38.2 294.8 Up 05:03:10 - 05:33:10 6793
Bend 05:18:11 -33.7 Dark Down 38.2 294.9 Up 05:03:11 - 05:33:11 6778
Paisley 05:18:17 -34.9 Dark Down 37.1 296.2 Up 05:03:17 - 05:33:17 6777
North Lake 05:18:15 -34.4 Dark Down 37.5 295.7 Up 05:03:15 - 05:33:15 6775
Sisters 05:18:10 -33.4 Dark Down 38.4 294.6 Up 05:03:10 - 05:33:10 6771
Lakeview 05:18:20 -35.3 Dark Down 36.7 296.7 Up 05:03:20 - 05:33:20 6771
Oregon Observatory 05:18:13 -33.7 Dark Down 38.2 295.0 Up 05:03:13 - 05:33:13 6765
Yuma 05:18:57 -44.4 Dark Down 27.9 303.9 Low 05:03:57 - 05:33:57 6762
Cedarville 05:18:23 -35.8 Dark Down 36.3 297.2 Up 05:03:23 - 05:33:23 6759
La Pine/Gilchrist 05:18:13 -33.8 Dark Down 38.1 295.1 Up 05:03:13 - 05:33:13 6755
Hawthorne 05:18:35 -38.5 Dark Down 33.8 299.6 Up 05:03:35 - 05:33:35 6743
Yerington 05:18:34 -37.8 Dark Down 34.4 299.2 Up 05:03:34 - 05:33:34 6728
Calipatria 05:18:56 -43.5 Dark Down 28.7 303.5 Low 05:03:56 - 05:33:56 6724
Bishop 05:18:40 -39.2 Dark Down 33.0 300.4 Up 05:03:40 - 05:33:40 6714
Reno 05:18:31 -37.1 Dark Down 35.1 298.6 Up 05:03:31 - 05:33:31 6709
Lone Pine 05:18:43 -39.9 Dark Down 32.4 300.9 Up 05:03:43 - 05:33:43 6705
Tulelake 05:18:21 -34.7 Dark Down 37.3 296.3 Up 05:03:21 - 05:33:21 6698
Carson City 05:18:33 -37.3 Dark Down 34.9 298.8 Up 05:03:33 - 05:33:33 6698
Chiloquin 05:18:18 -34.2 Dark Down 37.9 295.8 Up 05:03:18 - 05:33:18 6697
Lee Vining 05:18:38 -38.4 Dark Down 33.8 299.8 Up 05:03:38 - 05:33:38 6692
Gardnerville 05:18:34 -37.5 Dark Down 34.7 299.0 Up 05:03:34 - 05:33:34 6691
Susanville 05:18:28 -36.1 Dark Down 36.1 297.7 Up 05:03:28 - 05:33:28 6691
Klamath Falls 05:18:20 -34.4 Dark Down 37.7 296.0 Up 05:03:20 - 05:33:20 6690
Portola 05:18:30 -36.5 Dark Down 35.7 298.2 Up 05:03:30 - 05:33:30 6680
Idyllwild 05:18:54 -42.3 Dark Down 29.9 302.8 Low 05:03:54 - 05:33:54 6675
Fall River/Burney 05:18:25 -35.3 Dark Down 36.9 297.0 Up 05:03:25 - 05:33:25 6670
Gimple 05:18:29 -36.1 Dark Down 36.1 297.8 Up 05:03:29 - 05:33:29 6669
Greenville 05:18:29 -36.1 Dark Down 36.1 297.8 Up 05:03:29 - 05:33:29 6664
Quincy 05:18:30 -36.2 Dark Down 36.0 297.9 Up 05:03:30 - 05:33:30 6656
Wildwood 05:18:53 -40.8 Dark Down 31.4 302.1 Up 05:03:53 - 05:33:53 6570
CPSLO 05:18:49 -38.7 Dark Down 33.5 300.8 Up 05:03:49 - 05:33:49 6490

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 248835, (2018/03/12 05:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 28.19 138
Algol          03:08:10.1 +40:57:20  2.1  5.84 121
PPM 046386     03:38:00.2 +42:34:58  6.2  0.70 126
PPM 046433     03:40:49.8 +41:50:30  8.2  0.36 127
PPM 046417     03:39:26.2 +41:41:10  8.8  0.24 127
248835         03:38:55.6 +41:54:20 14.6       127
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:20:17 UT

Marc W. Buie, Southwest Research Institute

RECON