RECON: TNO occultation with 8405

Event between (8405) Asbolus and star UC4-650-022607 with event index number of 95789

Geocentric closest approach at 2017/12/15 12:42:41 UTC

J2000 position of star is 04:46:48.1 +39:54:03
Equinox of date position of star is 04:48:00.8 +39:55:53
Stellar brightness R=16.4, use SENSEUP=128
Star is 149 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=22.4

[RECON map]
TNO is 21.2 AU from the Sun and 20.3 AU from the Earth.
The TNO is moving 25.3 km/sec on the sky relative to the star, or, 6.2 arcsec/hr.
The 1-sigma error in the time of the event is 116 seconds.
The 1-sigma cross-track error in the shadow position is 1077 km.
The sky-plane scale is 14689.8 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 8405, (2017/12/15 12:43UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.2 +16:32:38  0.8 23.51 164
3Iot Aur       04:58:09.9 +33:11:34  2.7  7.04 152
PPM 047304     04:45:27.8 +40:49:06  6.0  1.01 149
PPM 047344     04:47:59.0 +40:20:37  6.9  0.41 149
PPM 069653     04:49:22.0 +39:59:51  9.9  0.26 149
8405           04:48:02.4 +39:55:56 16.4       149
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 14.3 km RECON observability=1.0 and success probability=23.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:39:09 -17.8 AT Up 19.8 306.0 Really Low 12:28:59 - 12:49:19 1701
Oroville 12:39:37 -29.2 Dark Down 33.0 294.8 Up 12:29:27 - 12:49:47 1629
Tonasket 12:39:36 -29.2 Dark Down 32.9 295.0 Up 12:29:26 - 12:49:46 1611
Okanogan 12:39:35 -29.3 Dark Down 32.8 295.1 Up 12:29:25 - 12:49:45 1579
Brewster 12:39:34 -29.4 Dark Down 32.8 295.1 Up 12:29:24 - 12:49:44 1549
Manson/Chelan 12:39:34 -29.6 Dark Down 32.9 295.0 Up 12:29:24 - 12:49:44 1516
Entiat 12:39:34 -29.7 Dark Down 32.9 295.1 Up 12:29:24 - 12:49:44 1496
Wenatchee 12:39:33 -29.7 Dark Down 32.9 295.2 Up 12:29:23 - 12:49:43 1472
Pasco 12:39:29 -28.8 Dark Down 31.6 296.5 Up 12:29:19 - 12:49:39 1438
Ellensburg 12:39:32 -29.9 Dark Down 32.8 295.3 Up 12:29:22 - 12:49:42 1430
PNWRO 12:39:28 -28.7 Dark Down 31.4 296.8 Up 12:29:18 - 12:49:38 1429
George/Umatilla 12:39:28 -29.0 Dark Down 31.6 296.6 Up 12:29:18 - 12:49:38 1401
Yakima 12:39:31 -29.9 Dark Down 32.7 295.5 Up 12:29:21 - 12:49:41 1397
Toppenish/White Swan 12:39:30 -29.7 Dark Down 32.5 295.8 Up 12:29:20 - 12:49:40 1388
Goldendale 12:39:29 -30.0 Dark Down 32.5 295.8 Up 12:29:19 - 12:49:39 1324
The Dalles 12:39:29 -30.2 Dark Down 32.6 295.8 Up 12:29:19 - 12:49:39 1289
Maupin 12:39:27 -30.1 Dark Down 32.4 296.1 Up 12:29:17 - 12:49:37 1261
Madras/Culver 12:39:26 -30.1 Dark Down 32.2 296.4 Up 12:29:16 - 12:49:36 1215
Redmond 12:39:25 -30.1 Dark Down 32.0 296.5 Up 12:29:15 - 12:49:35 1184
Sisters 12:39:26 -30.4 Dark Down 32.3 296.3 Up 12:29:16 - 12:49:36 1167
Bend 12:39:25 -30.2 Dark Down 32.0 296.6 Up 12:29:15 - 12:49:35 1160
Oregon Observatory 12:39:24 -30.3 Dark Down 32.0 296.6 Up 12:29:14 - 12:49:34 1140
La Pine/Gilchrist 12:39:24 -30.3 Dark Down 32.0 296.7 Up 12:29:14 - 12:49:34 1120
North Lake 12:39:22 -29.9 Dark Down 31.4 297.2 Up 12:29:12 - 12:49:32 1114
Paisley 12:39:21 -29.6 Dark Down 30.9 297.7 Up 12:29:11 - 12:49:31 1087
Lakeview 12:39:19 -29.4 Dark Down 30.6 298.0 Up 12:29:09 - 12:49:29 1056
Chiloquin 12:39:21 -30.5 Dark Down 31.7 297.1 Up 12:29:11 - 12:49:31 1012
Cedarville 12:39:17 -29.2 Dark Down 30.1 298.5 Up 12:29:07 - 12:49:27 1011
Klamath Falls 12:39:20 -30.4 Dark Down 31.5 297.4 Up 12:29:10 - 12:49:30 988
Tulelake 12:39:20 -30.2 Dark Down 31.2 297.6 Up 12:29:10 - 12:49:30 980
Fall River/Burney 12:39:17 -30.1 Dark Down 30.7 298.2 Up 12:29:07 - 12:49:27 909
Susanville 12:39:15 -29.4 Dark Down 29.9 298.8 Low 12:29:05 - 12:49:25 895
Tonopah 12:39:08 -26.5 Dark Up 26.5 301.4 Low 12:28:58 - 12:49:18 883
DCO 12:39:00 -22.7 Dark Up 22.1 304.1 Low 12:28:50 - 12:49:10 871
Reno 12:39:12 -28.7 Dark Down 29.0 299.6 Low 12:29:02 - 12:49:22 866
Gimple 12:39:15 -29.6 Dark Down 29.9 298.9 Low 12:29:05 - 12:49:25 861
Greenville 12:39:15 -29.6 Dark Down 30.0 298.8 Low 12:29:05 - 12:49:25 857
Yerington 12:39:11 -28.1 Dark Up 28.2 300.1 Low 12:29:01 - 12:49:21 855
Patrick 12:39:01 -23.4 Dark Up 22.8 303.7 Low 12:28:51 - 12:49:11 855
Portola 12:39:14 -29.2 Dark Down 29.5 299.2 Low 12:29:04 - 12:49:24 855
Indian Springs 12:39:04 -25.0 Dark Up 24.7 302.6 Low 12:28:54 - 12:49:14 846
Hawthorne 12:39:10 -27.6 Dark Up 27.7 300.6 Low 12:29:00 - 12:49:20 845
Henderson 12:39:02 -24.4 Dark Up 23.9 303.0 Low 12:28:52 - 12:49:12 842
Quincy 12:39:14 -29.6 Dark Down 29.9 298.9 Low 12:29:04 - 12:49:24 840
Carson City 12:39:12 -28.6 Dark Up 28.8 299.8 Low 12:29:02 - 12:49:22 838
Kingman/Dolan Springs 12:39:00 -23.5 Dark Up 22.8 303.7 Low 12:28:50 - 12:49:10 826
Gardnerville 12:39:12 -28.6 Dark Up 28.6 299.9 Low 12:29:02 - 12:49:22 820
Beatty 12:39:05 -25.9 Dark Up 25.6 302.0 Low 12:28:55 - 12:49:15 813
Searchlight/Boulder City 12:39:01 -24.2 Dark Up 23.5 303.3 Low 12:28:51 - 12:49:11 799
Laughlin/Bullhead City 12:39:01 -23.9 Dark Up 23.1 303.5 Low 12:28:51 - 12:49:11 794
Mohave Valley 12:39:00 -23.8 Dark Up 23.0 303.6 Low 12:28:50 - 12:49:10 773
Lee Vining 12:39:09 -27.9 Dark Up 27.7 300.6 Low 12:28:59 - 12:49:19 772
Bishop 12:39:07 -27.3 Dark Up 26.9 301.2 Low 12:28:57 - 12:49:17 762
Lake Havasu City 12:38:59 -23.5 Dark Up 22.6 303.8 Low 12:28:49 - 12:49:09 754
Parker 12:38:58 -23.4 Dark Up 22.4 304.0 Low 12:28:48 - 12:49:08 728
Lone Pine 12:39:05 -26.9 Dark Up 26.3 301.6 Low 12:28:55 - 12:49:15 717
Blythe 12:38:58 -23.5 Dark Up 22.3 304.0 Low 12:28:48 - 12:49:08 667
Yuma 12:38:56 -23.4 Dark Up 21.8 304.3 Low 12:28:46 - 12:49:06 589
Calipatria 12:38:57 -24.2 Dark Up 22.7 303.9 Low 12:28:47 - 12:49:07 572
Idyllwild 12:38:59 -25.3 Dark Up 23.8 303.2 Low 12:28:49 - 12:49:09 555
Wildwood 12:39:01 -26.9 Dark Up 25.3 302.4 Low 12:28:51 - 12:49:11 478
CPSLO 12:39:05 -28.8 Dark Up 27.4 301.2 Low 12:28:55 - 12:49:15 465

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 8405, (2017/12/15 12:43UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 23.51 164
3Iot Aur       04:56:59.6 +33:09:58  2.7  7.04 152
PPM 047304     04:44:13.0 +40:47:10  6.0  1.01 149
PPM 047344     04:46:44.5 +40:18:44  6.9  0.41 149
PPM 069653     04:48:07.7 +39:58:01  9.9  0.26 149
8405           04:46:48.1 +39:54:03 16.4       149
Positions are for J2000

Event circumstances last updated at 2017/07/29 16:12:28 UT

Marc W. Buie, Southwest Research Institute

RECON