RECON: TNO occultation with 8405

Event between (8405) Asbolus and star UC4-655-031366 with event index number of 233613

Geocentric closest approach at 2019/12/16 04:43:41 UTC

J2000 position of star is 05:13:42.4 +40:53:30
Equinox of date position of star is 05:14:58.7 +40:54:41
Stellar brightness R=14.0, use SENSEUP=64
Star is 55 degrees from the moon. Moon is 82% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 22.6 AU from the Sun and 21.7 AU from the Earth.
The TNO is moving 25.8 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 126 seconds.
The 1-sigma cross-track error in the shadow position is 955 km.
The sky-plane scale is 15711.7 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.5 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 8405, (2019/12/16 04:44UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:04.1 +16:32:52  0.8 25.71  65
3Iot Aur       04:58:17.8 +33:11:45  2.7  8.41  58
PPM 047999     05:21:38.9 +41:06:16  5.5  1.25  53
PPM 047827     05:13:38.8 +41:14:16  7.7  0.43  55
PPM 047876     05:15:48.8 +41:07:05  9.1  0.24  54
8405           05:15:06.4 +40:54:49 14.0        54
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 21.8 km RECON observability=1.0 and success probability=47.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:45:25 -45.3 Dark Up 59.6 89.3 Up 04:34:24 - 04:56:25 550
Tonasket 04:45:25 -45.3 Dark Up 59.6 88.9 Up 04:34:25 - 04:56:26 529
Okanogan 04:45:26 -45.3 Dark Up 59.5 88.2 Up 04:34:26 - 04:56:27 504
Brewster 04:45:27 -45.3 Dark Up 59.4 87.6 Up 04:34:27 - 04:56:28 487
Manson/Chelan 04:45:29 -45.1 Dark Up 59.1 87.0 Up 04:34:28 - 04:56:29 482
Entiat 04:45:29 -45.1 Dark Up 59.1 86.6 Up 04:34:29 - 04:56:30 464
Wenatchee 04:45:30 -45.1 Dark Up 59.0 86.1 Up 04:34:30 - 04:56:31 445
Ellensburg 04:45:31 -45.1 Dark Up 58.8 85.3 Up 04:34:31 - 04:56:32 416
Yakima 04:45:33 -45.2 Dark Up 58.8 84.6 Up 04:34:32 - 04:56:33 379
Toppenish/White Swan 04:45:33 -45.4 Dark Up 58.9 84.4 Up 04:34:32 - 04:56:33 353
Goldendale 04:45:35 -45.2 Dark Up 58.5 83.2 Up 04:34:34 - 04:56:35 319
The Dalles 04:45:36 -45.0 Dark Up 58.2 82.6 Up 04:34:36 - 04:56:37 313
Pasco 04:45:31 -46.2 Dark Up 59.7 84.9 Up 04:34:30 - 04:56:31 293
Maupin 04:45:37 -45.2 Dark Up 58.3 82.0 Up 04:34:37 - 04:56:38 271
George/Umatilla 04:45:32 -46.2 Dark Up 59.5 84.2 Up 04:34:31 - 04:56:32 270
PNWRO 04:45:31 -46.5 Dark Up 59.9 84.7 Up 04:34:30 - 04:56:31 261
Madras/Culver 04:45:38 -45.3 Dark Up 58.2 81.1 Up 04:34:38 - 04:56:39 222
Sisters 04:45:40 -45.0 Dark Up 57.8 80.4 Up 04:34:40 - 04:56:41 210
Redmond 04:45:39 -45.3 Dark Up 58.1 80.6 Up 04:34:39 - 04:56:40 191
Bend 04:45:40 -45.3 Dark Up 57.9 80.1 Up 04:34:40 - 04:56:41 178
Oregon Observatory 04:45:41 -45.2 Dark Up 57.8 79.8 Up 04:34:40 - 04:56:41 167
La Pine/Gilchrist 04:45:42 -45.2 Dark Up 57.7 79.5 Up 04:34:41 - 04:56:42 151
North Lake 04:45:41 -45.7 Dark Up 58.1 79.1 Up 04:34:41 - 04:56:42 86
Chiloquin 04:45:45 -45.2 Dark Up 57.3 77.6 Up 04:34:44 - 04:56:45 64
Klamath Falls 04:45:45 -45.3 Dark Up 57.3 77.1 Up 04:34:45 - 04:56:46 28
Paisley 04:45:42 -46.1 Dark Up 58.2 78.4 Up 04:34:41 - 04:56:42 20
Tulelake 04:45:45 -45.5 Dark Up 57.4 76.8 Up 04:34:45 - 04:56:46 -10
Lakeview 04:45:42 -46.3 Dark Up 58.3 77.6 Up 04:34:42 - 04:56:43 -36
Fall River/Burney 04:45:47 -45.7 Dark Up 57.3 75.5 Up 04:34:47 - 04:56:48 -98
Cedarville 04:45:44 -46.6 Dark Up 58.3 76.7 Up 04:34:43 - 04:56:44 -105
Susanville 04:45:47 -46.4 Dark Up 57.6 74.8 Up 04:34:47 - 04:56:48 -189
Greenville 04:45:48 -46.2 Dark Up 57.4 74.3 Up 04:34:48 - 04:56:49 -202
Gimple 04:45:48 -46.3 Dark Up 57.4 74.3 Up 04:34:48 - 04:56:49 -205
Quincy 04:45:49 -46.2 Dark Up 57.3 74.0 Up 04:34:48 - 04:56:49 -221
Portola 04:45:48 -46.6 Dark Up 57.6 73.9 Up 04:34:48 - 04:56:49 -253
Reno 04:45:47 -47.1 Dark Up 58.0 73.7 Up 04:34:47 - 04:56:48 -307
Carson City 04:45:48 -47.2 Dark Up 57.9 73.2 Up 04:34:47 - 04:56:48 -342
Gardnerville 04:45:48 -47.3 Dark Up 57.9 72.8 Up 04:34:48 - 04:56:49 -367
Yerington 04:45:47 -47.7 Dark Up 58.4 73.0 Up 04:34:46 - 04:56:47 -387
Hawthorne 04:45:46 -48.2 Dark Up 58.6 72.4 Up 04:34:46 - 04:56:47 -455
Lee Vining 04:45:49 -47.9 Dark Up 58.1 71.5 Up 04:34:48 - 04:56:49 -487
Tonopah 04:45:44 -49.4 Dark Up 59.5 72.0 Up 04:34:44 - 04:56:45 -560
Bishop 04:45:48 -48.5 Dark Up 58.4 70.7 Up 04:34:48 - 04:56:49 -576
Lone Pine 04:45:49 -48.9 Dark Up 58.4 69.6 Up 04:34:49 - 04:56:50 -664
CPSLO 04:45:58 -46.9 Dark Up 56.0 67.4 Up 04:34:57 - 04:56:58 -671
Beatty 04:45:45 -49.9 Dark Up 59.5 70.2 Up 04:34:45 - 04:56:46 -691
Indian Springs 04:45:43 -50.8 Dark Up 60.2 69.8 Up 04:34:42 - 04:56:43 -769
Niwot 04:45:09 -57.8 Dark Up 69.0 78.8 Up 04:34:08 - 04:56:09 -808
Henderson 04:45:42 -51.4 Dark Up 60.5 69.0 Up 04:34:42 - 04:56:43 -850
Wildwood 04:45:55 -48.6 Dark Up 57.1 65.9 Up 04:34:55 - 04:56:56 -881
Searchlight/Boulder City 04:45:43 -51.5 Dark Up 60.4 68.1 Up 04:34:42 - 04:56:43 -909
Laughlin/Bullhead City 04:45:43 -51.8 Dark Up 60.5 67.6 Up 04:34:42 - 04:56:43 -953
Patrick 04:45:40 -52.4 Dark Up 61.1 68.0 Up 04:34:40 - 04:56:41 -959
Kingman/Dolan Springs 04:45:41 -52.2 Dark Up 60.9 67.7 Up 04:34:41 - 04:56:42 -973
Mohave Valley 04:45:43 -51.9 Dark Up 60.4 67.2 Up 04:34:43 - 04:56:44 -980
Idyllwild 04:45:51 -50.2 Dark Up 58.3 65.4 Up 04:34:50 - 04:56:51 -1001
DCO 04:45:39 -53.0 Dark Up 61.5 67.5 Up 04:34:38 - 04:56:39 -1018
Lake Havasu City 04:45:43 -52.1 Dark Up 60.4 66.5 Up 04:34:43 - 04:56:44 -1030
Parker 04:45:44 -52.2 Dark Up 60.3 66.0 Up 04:34:43 - 04:56:44 -1066
Blythe 04:45:45 -52.0 Dark Up 59.9 65.1 Up 04:34:45 - 04:56:46 -1105
Calipatria 04:45:49 -51.2 Dark Up 59.0 64.4 Up 04:34:49 - 04:56:50 -1113
Yuma 04:45:47 -52.0 Dark Up 59.5 63.7 Up 04:34:47 - 04:56:48 -1194

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, (2019/12/16 04:44UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 25.71  65
3Iot Aur       04:56:59.6 +33:09:58  2.7  8.41  58
PPM 047999     05:20:14.6 +41:05:09  5.5  1.25  53
PPM 047827     05:12:14.5 +41:12:54  7.7  0.43  55
PPM 047876     05:14:24.6 +41:05:47  9.1  0.24  54
8405           05:13:42.4 +40:53:30 14.0        54
Positions are for J2000

Event circumstances last updated at 2018/02/17 17:07:00 UT

Marc W. Buie, Southwest Research Institute

RECON