RECON: TNO occultation with 8405

Event between (8405) Asbolus and star UC4-650-023680 with event index number of 178101

Geocentric closest approach at 2019/01/31 09:52:54 UTC

J2000 position of star is 04:52:50.7 +39:59:57
Equinox of date position of star is 04:54:05.1 +40:01:39
Stellar brightness R=15.8, use SENSEUP=128
Star is 159 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 22.0 AU from the Sun and 21.4 AU from the Earth.
The TNO is moving 14.9 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 201 seconds.
The 1-sigma cross-track error in the shadow position is 1887 km.
The sky-plane scale is 15550.0 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 6.1 sec chord
Diameter=37.2 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 8405, (2019/01/31 09:53UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:01.1 +16:32:46  0.8 23.78 167
3Iot Aur       04:58:14.4 +33:11:40  2.7  6.88 165
5 Aur          05:01:37.2 +39:25:19  6.4  1.56 160
PPM 047520     04:57:50.8 +40:11:52  8.0  0.72 159
PPM 047462     04:55:15.3 +40:02:09  9.7  0.21 159
8405           04:54:09.9 +40:01:46 15.8       159
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 4.5 sigma about the mid-time.
The median site spacing is 20.0 km RECON observability=1.0 and success probability=12.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 09:46:57 -53.0 Dark Down 32.2 295.6 Up 09:31:57 - 10:01:57 -2010
Tonasket 09:46:56 -53.2 Dark Down 32.1 295.8 Up 09:31:56 - 10:01:56 -2033
Okanogan 09:46:56 -53.5 Dark Down 32.1 295.9 Up 09:31:56 - 10:01:56 -2071
Brewster 09:46:56 -53.8 Dark Down 32.1 295.9 Up 09:31:56 - 10:01:56 -2105
Manson/Chelan 09:46:56 -54.1 Dark Down 32.2 295.8 Up 09:31:56 - 10:01:56 -2138
Entiat 09:46:56 -54.3 Dark Down 32.2 295.9 Up 09:31:56 - 10:01:56 -2162
Wenatchee 09:46:55 -54.5 Dark Down 32.1 296.0 Up 09:31:55 - 10:01:55 -2191
Niwot 09:46:13 -50.1 Dark Down 19.1 306.7 Really Low 09:31:13 - 10:01:13 -2224
Ellensburg 09:46:55 -54.9 Dark Down 32.1 296.1 Up 09:31:55 - 10:01:55 -2239
Pasco 09:46:50 -54.9 Dark Down 30.9 297.3 Up 09:31:50 - 10:01:50 -2262
PNWRO 09:46:49 -54.9 Dark Down 30.6 297.5 Up 09:31:49 - 10:01:49 -2278
Yakima 09:46:54 -55.3 Dark Down 31.9 296.3 Up 09:31:54 - 10:01:54 -2280
Toppenish/White Swan 09:46:53 -55.3 Dark Down 31.7 296.5 Up 09:31:53 - 10:01:53 -2296
George/Umatilla 09:46:49 -55.2 Dark Down 30.9 297.3 Up 09:31:49 - 10:01:49 -2303
Goldendale 09:46:53 -56.0 Dark Down 31.7 296.6 Up 09:31:53 - 10:01:53 -2365
The Dalles 09:46:54 -56.3 Dark Down 31.9 296.6 Up 09:31:54 - 10:01:54 -2401
Maupin 09:46:53 -56.6 Dark Down 31.6 296.8 Up 09:31:53 - 10:01:53 -2438
Madras/Culver 09:46:53 -57.0 Dark Down 31.4 297.1 Up 09:31:53 - 10:01:53 -2494
Redmond 09:46:52 -57.3 Dark Down 31.2 297.3 Up 09:31:52 - 10:01:52 -2532
Sisters 09:46:53 -57.5 Dark Down 31.5 297.1 Up 09:31:53 - 10:01:53 -2544
Bend 09:46:52 -57.5 Dark Down 31.2 297.3 Up 09:31:52 - 10:01:52 -2558
Oregon Observatory 09:46:52 -57.7 Dark Down 31.2 297.4 Up 09:31:52 - 10:01:52 -2580
La Pine/Gilchrist 09:46:52 -57.9 Dark Down 31.2 297.4 Up 09:31:52 - 10:01:52 -2602
North Lake 09:46:49 -57.9 Dark Down 30.6 298.0 Up 09:31:49 - 10:01:49 -2624
Paisley 09:46:48 -58.1 Dark Down 30.1 298.4 Up 09:31:48 - 10:01:48 -2665
Lakeview 09:46:46 -58.4 Dark Down 29.8 298.8 Low 09:31:46 - 10:01:46 -2708
Chiloquin 09:46:52 -58.9 Dark Down 30.9 297.9 Up 09:31:52 - 10:01:52 -2726
Klamath Falls 09:46:49 -59.1 Dark Down 30.7 298.1 Up 09:31:49 - 10:01:49 -2757
Cedarville 09:46:46 -58.8 Dark Down 29.3 299.2 Low 09:31:46 - 10:01:46 -2766
Tulelake 09:46:49 -59.1 Dark Down 30.4 298.4 Up 09:31:49 - 10:01:49 -2773
Fall River/Burney 09:46:47 -59.8 Dark Down 29.9 298.9 Low 09:31:47 - 10:01:47 -2860
Susanville 09:46:45 -59.8 Dark Down 29.1 299.5 Low 09:31:45 - 10:01:45 -2894
Gimple 09:46:45 -60.1 Dark Down 29.1 299.5 Low 09:31:45 - 10:01:45 -2930
Greenville 09:46:46 -60.1 Dark Down 29.2 299.5 Low 09:31:46 - 10:01:46 -2933
Portola 09:46:43 -60.1 Dark Down 28.7 299.9 Low 09:31:43 - 10:01:43 -2947
Reno 09:46:42 -59.9 Dark Down 28.1 300.3 Low 09:31:42 - 10:01:42 -2947
Quincy 09:46:46 -60.3 Dark Down 29.1 299.6 Low 09:31:46 - 10:01:46 -2953
Yerington 09:46:40 -59.9 Dark Down 27.4 300.8 Low 09:31:40 - 10:01:40 -2975
Carson City 09:46:41 -60.1 Dark Down 27.9 300.4 Low 09:31:41 - 10:01:41 -2982
Tonopah 09:46:33 -59.2 Dark Down 25.6 302.0 Low 09:31:33 - 10:01:33 -2984
Hawthorne 09:46:37 -59.8 Dark Down 26.8 301.2 Low 09:31:37 - 10:01:37 -2999
Gardnerville 09:46:41 -60.3 Dark Down 27.8 300.6 Low 09:31:41 - 10:01:41 -3004
Indian Springs 09:46:28 -59.0 Dark Down 23.8 303.2 Low 09:31:28 - 10:01:28 -3059
Lee Vining 09:46:38 -60.5 Dark Down 26.8 301.3 Low 09:31:38 - 10:01:38 -3074
Beatty 09:46:32 -59.6 Dark Down 24.7 302.6 Low 09:31:32 - 10:01:32 -3076
Henderson 09:46:27 -58.8 Dark Down 23.1 303.7 Low 09:31:27 - 10:01:27 -3078
DCO 09:46:21 -57.9 Dark Down 21.3 304.7 Low 09:31:21 - 10:01:21 -3079
Patrick 09:46:24 -58.3 Dark Down 22.0 304.3 Low 09:31:24 - 10:01:24 -3085
Bishop 09:46:36 -60.4 Dark Down 26.1 301.8 Low 09:31:36 - 10:01:36 -3102
Kingman/Dolan Springs 09:46:24 -58.5 Dark Down 22.0 304.3 Low 09:31:24 - 10:01:24 -3115
Searchlight/Boulder City 09:46:26 -59.0 Dark Down 22.7 303.9 Low 09:31:26 - 10:01:26 -3129
Laughlin/Bullhead City 09:46:25 -58.9 Dark Down 22.3 304.1 Low 09:31:25 - 10:01:25 -3141
Lone Pine 09:46:35 -60.6 Dark Down 25.4 302.2 Low 09:31:35 - 10:01:35 -3161
Mohave Valley 09:46:25 -59.1 Dark Down 22.1 304.2 Low 09:31:25 - 10:01:25 -3167
Lake Havasu City 09:46:24 -59.1 Dark Down 21.8 304.4 Low 09:31:24 - 10:01:24 -3192
Parker 09:46:24 -59.2 Dark Down 21.5 304.6 Low 09:31:24 - 10:01:24 -3224
Blythe 09:46:24 -59.6 Dark Down 21.4 304.6 Low 09:31:24 - 10:01:24 -3288
Idyllwild 09:46:28 -61.2 Dark Down 23.0 303.8 Low 09:31:28 - 10:01:28 -3376
Yuma 09:46:24 -60.0 Dark Down 20.9 304.9 Low 09:31:24 - 10:01:24 -3376
Calipatria 09:46:26 -60.5 Dark Down 21.8 304.4 Low 09:31:26 - 10:01:26 -3378
CPSLO 09:46:40 -63.1 Dark Down 26.5 301.8 Low 09:31:40 - 10:01:40 -3396
Wildwood 09:46:34 -62.3 Dark Down 24.4 303.0 Low 09:31:34 - 10:01:34 -3426

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, (2019/01/31 09:53UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 23.78 167
3Iot Aur       04:56:59.6 +33:09:58  2.7  6.88 165
5 Aur          05:00:18.3 +39:23:41  6.4  1.56 160
PPM 047520     04:56:31.4 +40:10:09  8.0  0.72 159
PPM 047462     04:53:56.1 +40:00:22  9.7  0.21 159
8405           04:52:50.7 +39:59:57 15.8       159
Positions are for J2000

Event circumstances last updated at 2017/12/05 19:12:53 UT

Marc W. Buie, Southwest Research Institute

RECON