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 09:52:55 UTC

J2000 position of star is 04:52:50.7 +39:59:57
Equinox of date position of star is 04:54:03.7 +40:01:38
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 189 seconds.
The 1-sigma cross-track error in the shadow position is 1783 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 4.8 sigma about the mid-time.
The median site spacing is 21.2 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 09:46:56 -53.0 Dark Down 32.2 295.6 Up 09:31:56 - 10:01:56 -2001
Tonasket 09:46:55 -53.2 Dark Down 32.1 295.8 Up 09:31:55 - 10:01:55 -2023
Okanogan 09:46:54 -53.5 Dark Down 32.1 295.9 Up 09:31:54 - 10:01:54 -2061
Brewster 09:46:54 -53.8 Dark Down 32.1 295.9 Up 09:31:54 - 10:01:54 -2095
Manson/Chelan 09:46:55 -54.1 Dark Down 32.2 295.8 Up 09:31:55 - 10:01:55 -2128
Entiat 09:46:54 -54.3 Dark Down 32.2 295.9 Up 09:31:54 - 10:01:54 -2152
Wenatchee 09:46:55 -54.5 Dark Down 32.1 296.0 Up 09:31:55 - 10:01:55 -2181
Niwot 09:46:13 -50.1 Dark Down 19.1 306.7 Really Low 09:31:13 - 10:01:13 -2209
Ellensburg 09:46:54 -54.9 Dark Down 32.1 296.1 Up 09:31:54 - 10:01:54 -2229
Pasco 09:46:50 -54.9 Dark Down 30.9 297.3 Up 09:31:50 - 10:01:50 -2252
PNWRO 09:46:49 -54.9 Dark Down 30.6 297.5 Up 09:31:49 - 10:01:49 -2268
Yakima 09:46:53 -55.3 Dark Down 31.9 296.3 Up 09:31:53 - 10:01:53 -2270
Toppenish/White Swan 09:46:52 -55.4 Dark Down 31.7 296.5 Up 09:31:52 - 10:01:52 -2286
George/Umatilla 09:46:49 -55.2 Dark Down 30.9 297.3 Up 09:31:49 - 10:01:49 -2293
Goldendale 09:46:53 -56.0 Dark Down 31.7 296.6 Up 09:31:53 - 10:01:53 -2355
The Dalles 09:46:52 -56.3 Dark Down 31.9 296.6 Up 09:31:52 - 10:01:52 -2391
Maupin 09:46:52 -56.6 Dark Down 31.6 296.8 Up 09:31:52 - 10:01:52 -2428
Madras/Culver 09:46:51 -57.0 Dark Down 31.4 297.1 Up 09:31:51 - 10:01:51 -2484
Redmond 09:46:50 -57.3 Dark Down 31.3 297.3 Up 09:31:50 - 10:01:50 -2521
Sisters 09:46:52 -57.5 Dark Down 31.5 297.1 Up 09:31:52 - 10:01:52 -2533
Bend 09:46:51 -57.5 Dark Down 31.2 297.3 Up 09:31:51 - 10:01:51 -2548
Oregon Observatory 09:46:51 -57.7 Dark Down 31.2 297.4 Up 09:31:51 - 10:01:51 -2570
La Pine/Gilchrist 09:46:51 -57.9 Dark Down 31.2 297.4 Up 09:31:51 - 10:01:51 -2592
North Lake 09:46:49 -57.9 Dark Down 30.6 298.0 Up 09:31:49 - 10:01:49 -2613
Paisley 09:46:47 -58.1 Dark Down 30.1 298.4 Up 09:31:47 - 10:01:47 -2654
Lakeview 09:46:46 -58.4 Dark Down 29.8 298.8 Low 09:31:46 - 10:01:46 -2697
Chiloquin 09:46:50 -58.9 Dark Down 30.9 297.9 Up 09:31:50 - 10:01:50 -2716
Klamath Falls 09:46:49 -59.1 Dark Down 30.7 298.1 Up 09:31:49 - 10:01:49 -2747
Cedarville 09:46:44 -58.8 Dark Down 29.3 299.2 Low 09:31:44 - 10:01:44 -2755
Tulelake 09:46:48 -59.1 Dark Down 30.4 298.4 Up 09:31:48 - 10:01:48 -2762
Fall River/Burney 09:46:47 -59.8 Dark Down 29.9 298.9 Low 09:31:47 - 10:01:47 -2850
Susanville 09:46:45 -59.8 Dark Down 29.1 299.5 Low 09:31:45 - 10:01:45 -2883
Gimple 09:46:45 -60.1 Dark Down 29.1 299.5 Low 09:31:45 - 10:01:45 -2919
Greenville 09:46:45 -60.1 Dark Down 29.2 299.5 Low 09:31:45 - 10:01:45 -2922
Portola 09:46:44 -60.1 Dark Down 28.7 299.9 Low 09:31:44 - 10:01:44 -2936
Reno 09:46:41 -59.9 Dark Down 28.1 300.3 Low 09:31:41 - 10:01:41 -2936
Quincy 09:46:44 -60.3 Dark Down 29.1 299.6 Low 09:31:44 - 10:01:44 -2942
Yerington 09:46:38 -59.9 Dark Down 27.4 300.8 Low 09:31:38 - 10:01:38 -2963
Carson City 09:46:41 -60.1 Dark Down 27.9 300.4 Low 09:31:41 - 10:01:41 -2970
Tonopah 09:46:34 -59.2 Dark Down 25.6 302.0 Low 09:31:34 - 10:01:34 -2972
Hawthorne 09:46:37 -59.8 Dark Down 26.8 301.2 Low 09:31:37 - 10:01:37 -2987
Gardnerville 09:46:40 -60.3 Dark Down 27.8 300.6 Low 09:31:40 - 10:01:40 -2992
Indian Springs 09:46:28 -59.0 Dark Down 23.8 303.2 Low 09:31:28 - 10:01:28 -3046
Lee Vining 09:46:37 -60.5 Dark Down 26.9 301.3 Low 09:31:37 - 10:01:37 -3062
Beatty 09:46:30 -59.6 Dark Down 24.7 302.6 Low 09:31:30 - 10:01:30 -3063
Henderson 09:46:27 -58.8 Dark Down 23.1 303.7 Low 09:31:27 - 10:01:27 -3065
DCO 09:46:21 -57.9 Dark Down 21.3 304.7 Low 09:31:21 - 10:01:21 -3065
Patrick 09:46:22 -58.3 Dark Down 22.0 304.3 Low 09:31:22 - 10:01:22 -3071
Bishop 09:46:36 -60.4 Dark Down 26.1 301.8 Low 09:31:36 - 10:01:36 -3090
Kingman/Dolan Springs 09:46:23 -58.6 Dark Down 22.0 304.3 Low 09:31:23 - 10:01:23 -3101
Searchlight/Boulder City 09:46:24 -59.0 Dark Down 22.7 303.9 Low 09:31:24 - 10:01:24 -3116
Laughlin/Bullhead City 09:46:24 -58.9 Dark Down 22.3 304.1 Low 09:31:24 - 10:01:24 -3127
Lone Pine 09:46:34 -60.6 Dark Down 25.4 302.2 Low 09:31:34 - 10:01:34 -3149
Mohave Valley 09:46:24 -59.1 Dark Down 22.1 304.2 Low 09:31:24 - 10:01:24 -3153
Lake Havasu City 09:46:23 -59.1 Dark Down 21.8 304.4 Low 09:31:23 - 10:01:23 -3179
Parker 09:46:22 -59.2 Dark Down 21.5 304.6 Low 09:31:22 - 10:01:22 -3210
Blythe 09:46:22 -59.6 Dark Down 21.4 304.6 Low 09:31:22 - 10:01:22 -3274
Yuma 09:46:23 -60.0 Dark Down 20.9 304.9 Low 09:31:23 - 10:01:23 -3362
Idyllwild 09:46:28 -61.2 Dark Down 23.0 303.8 Low 09:31:28 - 10:01:28 -3363
Calipatria 09:46:24 -60.5 Dark Down 21.8 304.4 Low 09:31:24 - 10:01:24 -3365
CPSLO 09:46:39 -63.1 Dark Down 26.5 301.8 Low 09:31:39 - 10:01:39 -3384
Wildwood 09:46:33 -62.3 Dark Down 24.4 303.0 Low 09:31:33 - 10:01:33 -3413

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 2017/08/04 18:04:20 UT

Marc W. Buie, Southwest Research Institute

RECON