RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1280:01699400 with event index number of 178101

Geocentric closest approach at 2019/01/31 10:26:14 UTC

J2000 position of star is 04:52:50.6 +39:59:55
Equinox of date position of star is 04:54:08.3 +40:01:43
Stellar brightness G=16.0, 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 176 seconds.
The 1-sigma cross-track error in the shadow position is 1469 km.
The sky-plane scale is 15550.2 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 10:26UT)
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           04:54:09.8 +40:01:45 16.0       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 5.1 sigma about the mid-time.
The median site spacing is 21.2 km RECON observability=0.7 and success probability=2.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Rutland 10:20:04 -48.5 Dark Down 27.9 300.0 Low 10:05:04 - 10:35:04 -3975
Penticton 10:20:03 -48.8 Dark Down 27.8 300.1 Low 10:05:03 - 10:35:03 -4016
Okanagan Falls 10:20:03 -48.9 Dark Down 27.7 300.2 Low 10:05:03 - 10:35:03 -4034
Southern Okanagan 10:20:02 -49.0 Dark Down 27.6 300.3 Low 10:05:02 - 10:35:02 -4048
Oroville 10:20:01 -49.1 Dark Down 27.4 300.4 Low 10:05:01 - 10:35:01 -4066
Tonasket 10:20:01 -49.2 Dark Down 27.3 300.5 Low 10:05:01 - 10:35:01 -4087
Okanogan 10:20:01 -49.5 Dark Down 27.2 300.6 Low 10:05:01 - 10:35:01 -4124
Niwot 10:19:26 -44.1 Dark Down 14.1 310.9 Really Low 10:04:26 - 10:34:26 -4138
Brewster 10:20:00 -49.8 Dark Down 27.2 300.6 Low 10:05:00 - 10:35:00 -4157
Manson/Chelan 10:20:02 -50.1 Dark Down 27.3 300.5 Low 10:05:02 - 10:35:02 -4192
Entiat 10:19:59 -50.3 Dark Down 27.3 300.5 Low 10:04:59 - 10:34:59 -4215
Wenatchee 10:19:59 -50.5 Dark Down 27.2 300.6 Low 10:04:59 - 10:34:59 -4243
Ellensburg 10:19:59 -50.9 Dark Down 27.1 300.7 Low 10:04:59 - 10:34:59 -4290
Pasco 10:19:55 -50.6 Dark Down 25.9 301.8 Low 10:04:55 - 10:34:55 -4300
PNWRO 10:19:54 -50.6 Dark Down 25.6 302.0 Low 10:04:54 - 10:34:54 -4313
Yakima 10:19:58 -51.2 Dark Down 26.9 300.8 Low 10:04:58 - 10:34:58 -4329
George/Umatilla 10:19:54 -50.9 Dark Down 25.8 301.8 Low 10:04:54 - 10:34:54 -4340
Toppenish/White Swan 10:19:58 -51.2 Dark Down 26.7 301.0 Low 10:04:58 - 10:34:58 -4342
Goldendale 10:19:57 -51.8 Dark Down 26.7 301.0 Low 10:04:57 - 10:34:57 -4411
The Dalles 10:19:57 -52.1 Dark Down 26.8 300.9 Low 10:04:57 - 10:34:57 -4448
Maupin 10:19:56 -52.3 Dark Down 26.5 301.2 Low 10:04:56 - 10:34:56 -4483
Madras/Culver 10:19:56 -52.7 Dark Down 26.2 301.4 Low 10:04:56 - 10:34:56 -4536
Redmond 10:19:54 -52.9 Dark Down 26.1 301.5 Low 10:04:54 - 10:34:54 -4571
Sisters 10:19:55 -53.1 Dark Down 26.3 301.3 Low 10:04:55 - 10:34:55 -4586
Bend 10:19:54 -53.1 Dark Down 26.1 301.5 Low 10:04:54 - 10:34:54 -4598
Oregon Observatory 10:19:54 -53.3 Dark Down 26.0 301.5 Low 10:04:54 - 10:34:54 -4619
La Pine/Gilchrist 10:19:54 -53.5 Dark Down 26.0 301.6 Low 10:04:54 - 10:34:54 -4641
North Lake 10:19:52 -53.4 Dark Down 25.4 302.0 Low 10:04:52 - 10:34:52 -4656
Paisley 10:19:50 -53.5 Dark Down 24.9 302.4 Low 10:04:50 - 10:34:50 -4692
Lakeview 10:19:51 -53.6 Dark Down 24.5 302.7 Low 10:04:51 - 10:34:51 -4731
Chiloquin 10:19:53 -54.3 Dark Down 25.6 301.8 Low 10:04:53 - 10:34:53 -4762
Cedarville 10:19:48 -53.9 Dark Down 24.0 303.1 Low 10:04:48 - 10:34:48 -4784
Klamath Falls 10:19:52 -54.5 Dark Down 25.4 302.0 Low 10:04:52 - 10:34:52 -4790
Tulelake 10:19:51 -54.5 Dark Down 25.1 302.3 Low 10:04:51 - 10:34:51 -4803
Fall River/Burney 10:19:50 -54.9 Dark Down 24.5 302.7 Low 10:04:50 - 10:34:50 -4885
Susanville 10:19:47 -54.8 Dark Down 23.7 303.2 Low 10:04:47 - 10:34:47 -4910
Gimple 10:19:47 -55.1 Dark Down 23.7 303.2 Low 10:04:47 - 10:34:47 -4946
Greenville 10:19:47 -55.1 Dark Down 23.7 303.2 Low 10:04:47 - 10:34:47 -4950
Reno 10:19:44 -54.7 Dark Down 22.7 303.9 Low 10:04:44 - 10:34:44 -4953
Portola 10:19:45 -55.0 Dark Down 23.3 303.5 Low 10:04:45 - 10:34:45 -4958
Tonopah 10:19:37 -53.6 Dark Down 20.2 305.6 Low 10:04:37 - 10:34:37 -4963
Quincy 10:19:47 -55.2 Dark Down 23.6 303.3 Low 10:04:47 - 10:34:47 -4968
Yerington 10:19:42 -54.5 Dark Down 22.0 304.4 Low 10:04:42 - 10:34:42 -4973
Carson City 10:19:44 -54.8 Dark Down 22.5 304.1 Low 10:04:44 - 10:34:44 -4985
Hawthorne 10:19:40 -54.4 Dark Down 21.4 304.8 Low 10:04:40 - 10:34:40 -4990
Gardnerville 10:19:44 -54.9 Dark Down 22.3 304.2 Low 10:04:44 - 10:34:44 -5005
DCO 10:19:27 -51.6 Dark Down 15.9 308.1 Really Low 10:04:27 - 10:34:27 -5014
Indian Springs 10:19:33 -53.1 Dark Down 18.4 306.7 Really Low 10:04:33 - 10:34:33 -5019
Patrick 10:19:29 -52.1 Dark Down 16.5 307.7 Really Low 10:04:29 - 10:34:29 -5026
Henderson 10:19:33 -52.7 Dark Down 17.6 307.1 Really Low 10:04:33 - 10:34:33 -5030
Beatty 10:19:36 -53.7 Dark Down 19.2 306.1 Really Low 10:04:36 - 10:34:36 -5045
Kingman/Dolan Springs 10:19:29 -52.3 Dark Down 16.5 307.7 Really Low 10:04:29 - 10:34:29 -5056
Lee Vining 10:19:41 -55.0 Dark Down 21.4 304.8 Low 10:04:41 - 10:34:41 -5066
Searchlight/Boulder City 10:19:30 -52.9 Dark Down 17.2 307.3 Really Low 10:04:30 - 10:34:30 -5078
Bishop 10:19:39 -54.7 Dark Down 20.6 305.3 Low 10:04:39 - 10:34:39 -5085
Laughlin/Bullhead City 10:19:32 -52.7 Dark Down 16.8 307.5 Really Low 10:04:32 - 10:34:32 -5086
Mohave Valley 10:19:30 -52.8 Dark Down 16.6 307.6 Really Low 10:04:30 - 10:34:30 -5110
Lake Havasu City 10:19:30 -52.7 Dark Down 16.2 307.8 Really Low 10:04:30 - 10:34:30 -5132
Lone Pine 10:19:37 -54.8 Dark Down 19.9 305.6 Really Low 10:04:37 - 10:34:37 -5139
Parker 10:19:29 -52.8 Dark Down 16.0 307.8 Really Low 10:04:29 - 10:34:29 -5162
Blythe 10:19:29 -53.2 Dark Down 15.9 307.8 Really Low 10:04:29 - 10:34:29 -5225
Yuma 10:19:29 -53.5 Dark Down 15.3 308.0 Really Low 10:04:29 - 10:34:29 -5309
Calipatria 10:19:29 -54.1 Dark Down 16.2 307.6 Really Low 10:04:29 - 10:34:29 -5320
Idyllwild 10:19:32 -54.8 Dark Down 17.3 307.0 Really Low 10:04:32 - 10:34:32 -5329
CPSLO 10:19:41 -57.2 Dark Down 20.9 305.0 Low 10:04:41 - 10:34:41 -5387
Wildwood 10:19:36 -56.2 Dark Down 18.8 306.1 Really Low 10:04:36 - 10:34:36 -5396

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 10:26UT)
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           04:52:50.6 +39:59:55 16.0       159
Positions are for J2000

Event circumstances last updated at 2018/09/19 23:45:28 UT

Marc W. Buie, Southwest Research Institute

RECON