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 05:16:05 UTC

J2000 position of star is 03:38:55.6 +41:54:20
Equinox of date position of star is 03:40:07.0 +41:57:43
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 402 seconds.
The 1-sigma cross-track error in the shadow position is 5514 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 2.2 sigma about the mid-time.
The median site spacing is 4.9 km RECON observability=1.0 and success probability=3.6%
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 7561
Oroville 05:17:48 -31.9 Dark Down 39.0 292.3 Up 05:02:48 - 05:32:48 7033
Tonasket 05:17:50 -32.0 Dark Down 38.9 292.4 Up 05:02:50 - 05:32:50 7027
Okanogan 05:17:51 -32.1 Dark Down 38.9 292.6 Up 05:02:51 - 05:32:51 7011
Brewster 05:17:53 -32.2 Dark Down 38.9 292.7 Up 05:02:53 - 05:32:53 6994
PNWRO 05:18:02 -34.0 Dark Down 37.5 294.7 Up 05:03:02 - 05:33:02 6986
Pasco 05:18:01 -33.7 Dark Down 37.7 294.4 Up 05:03:01 - 05:33:01 6980
Manson/Chelan 05:17:54 -32.1 Dark Down 39.0 292.7 Up 05:02:54 - 05:32:54 6969
DCO 05:18:46 -44.0 Dark Down 28.2 303.3 Low 05:03:46 - 05:33:46 6965
Entiat 05:17:55 -32.2 Dark Down 39.0 292.8 Up 05:02:55 - 05:32:55 6960
George/Umatilla 05:18:03 -33.8 Dark Down 37.7 294.5 Up 05:03:03 - 05:33:03 6959
Wenatchee 05:17:56 -32.3 Dark Down 38.9 292.9 Up 05:02:56 - 05:32:56 6948
Patrick 05:18:46 -43.4 Dark Down 28.9 302.9 Low 05:03:46 - 05:33:46 6933
Ellensburg 05:17:58 -32.4 Dark Down 38.9 293.1 Up 05:02:58 - 05:32:58 6925
Toppenish/White Swan 05:18:01 -32.9 Dark Down 38.6 293.7 Up 05:03:01 - 05:33:01 6915
Kingman/Dolan Springs 05:18:46 -43.4 Dark Down 28.9 303.0 Low 05:03:46 - 05:33:46 6914
Yakima 05:18:00 -32.7 Dark Down 38.8 293.4 Up 05:03:00 - 05:33:00 6912
Henderson 05:18:44 -42.3 Dark Down 30.0 302.3 Low 05:03:44 - 05:33:44 6889
Laughlin/Bullhead City 05:18:47 -43.0 Dark Down 29.2 302.8 Low 05:03:47 - 05:33:47 6881
Goldendale 05:18:04 -33.0 Dark Down 38.6 293.9 Up 05:03:04 - 05:33:04 6876
Searchlight/Boulder City 05:18:46 -42.6 Dark Down 29.6 302.6 Low 05:03:46 - 05:33:46 6872
Mohave Valley 05:18:48 -43.2 Dark Down 29.1 303.0 Low 05:03:48 - 05:33:48 6871
Lake Havasu City 05:18:49 -43.6 Dark Down 28.7 303.2 Low 05:03:49 - 05:33:49 6871
Indian Springs 05:18:42 -41.5 Dark Down 30.7 301.8 Up 05:03:42 - 05:33:42 6867
Parker 05:18:51 -43.8 Dark Down 28.5 303.4 Low 05:03:51 - 05:33:51 6859
The Dalles 05:18:05 -32.9 Dark Down 38.7 293.9 Up 05:03:05 - 05:33:05 6850
Maupin 05:18:06 -33.2 Dark Down 38.5 294.2 Up 05:03:06 - 05:33:06 6843
Tonopah 05:18:36 -39.6 Dark Down 32.6 300.4 Up 05:03:36 - 05:33:36 6830
Madras/Culver 05:18:09 -33.5 Dark Down 38.3 294.6 Up 05:03:09 - 05:33:09 6824
Blythe 05:18:53 -43.9 Dark Down 28.4 303.5 Low 05:03:53 - 05:33:53 6820
Beatty 05:18:41 -40.6 Dark Down 31.7 301.2 Up 05:03:41 - 05:33:41 6814
Redmond 05:18:10 -33.7 Dark Down 38.2 294.8 Up 05:03:10 - 05:33:10 6810
Bend 05:18:12 -33.7 Dark Down 38.2 294.9 Up 05:03:12 - 05:33:12 6795
Paisley 05:18:18 -34.9 Dark Down 37.1 296.2 Up 05:03:18 - 05:33:18 6795
North Lake 05:18:16 -34.4 Dark Down 37.5 295.7 Up 05:03:16 - 05:33:16 6792
Lakeview 05:18:20 -35.3 Dark Down 36.7 296.7 Up 05:03:20 - 05:33:20 6789
Sisters 05:18:11 -33.4 Dark Down 38.4 294.6 Up 05:03:11 - 05:33:11 6788
Oregon Observatory 05:18:13 -33.7 Dark Down 38.2 295.0 Up 05:03:13 - 05:33:13 6782
Yuma 05:18:57 -44.4 Dark Down 27.9 303.9 Low 05:03:57 - 05:33:57 6781
Cedarville 05:18:23 -35.8 Dark Down 36.3 297.2 Up 05:03:23 - 05:33:23 6777
La Pine/Gilchrist 05:18:13 -33.8 Dark Down 38.1 295.1 Up 05:03:13 - 05:33:13 6772
Hawthorne 05:18:35 -38.4 Dark Down 33.8 299.6 Up 05:03:35 - 05:33:35 6762
Yerington 05:18:33 -37.8 Dark Down 34.4 299.2 Up 05:03:33 - 05:33:33 6747
Calipatria 05:18:56 -43.5 Dark Down 28.7 303.5 Low 05:03:56 - 05:33:56 6742
Bishop 05:18:39 -39.2 Dark Down 33.0 300.4 Up 05:03:39 - 05:33:39 6732
Reno 05:18:31 -37.1 Dark Down 35.1 298.6 Up 05:03:31 - 05:33:31 6728
Lone Pine 05:18:42 -39.9 Dark Down 32.4 300.9 Up 05:03:42 - 05:33:42 6724
Carson City 05:18:32 -37.3 Dark Down 34.9 298.8 Up 05:03:32 - 05:33:32 6716
Tulelake 05:18:21 -34.7 Dark Down 37.3 296.3 Up 05:03:21 - 05:33:21 6716
Chiloquin 05:18:19 -34.2 Dark Down 37.9 295.8 Up 05:03:19 - 05:33:19 6714
Lee Vining 05:18:37 -38.4 Dark Down 33.8 299.8 Up 05:03:37 - 05:33:37 6711
Gardnerville 05:18:33 -37.5 Dark Down 34.7 299.0 Up 05:03:33 - 05:33:33 6710
Susanville 05:18:28 -36.1 Dark Down 36.1 297.7 Up 05:03:28 - 05:33:28 6709
Klamath Falls 05:18:20 -34.4 Dark Down 37.7 296.0 Up 05:03:20 - 05:33:20 6707
Portola 05:18:30 -36.5 Dark Down 35.7 298.2 Up 05:03:30 - 05:33:30 6699
Idyllwild 05:18:54 -42.3 Dark Down 29.9 302.8 Low 05:03:54 - 05:33:54 6694
Fall River/Burney 05:18:25 -35.3 Dark Down 36.9 297.0 Up 05:03:25 - 05:33:25 6688
Gimple 05:18:29 -36.1 Dark Down 36.1 297.8 Up 05:03:29 - 05:33:29 6687
Greenville 05:18:29 -36.1 Dark Down 36.1 297.8 Up 05:03:29 - 05:33:29 6682
Quincy 05:18:30 -36.2 Dark Down 36.0 297.9 Up 05:03:30 - 05:33:30 6674
Wildwood 05:18:53 -40.8 Dark Down 31.4 302.1 Up 05:03:53 - 05:33:53 6589
CPSLO 05:18:49 -38.7 Dark Down 33.5 300.8 Up 05:03:49 - 05:33:49 6509

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 2017/08/01 16:34:37 UT

Marc W. Buie, Southwest Research Institute

RECON