RECON: TNO occultation with 12DY98

Event between 12DY98 and star GA0860:04128717 with event index number of 249154

Geocentric closest approach at 2019/12/31 12:36:35 UTC

J2000 position of star is 12:49:52.6 -03:45:34
Equinox of date position of star is 12:50:51.6 -03:51:48
Stellar brightness G=15.5, use SENSEUP=128
Star is 147 degrees from the moon. Moon is 26% illuminated.
TNO apparent brightness V=22.9

[RECON map]
TNO is 35.5 AU from the Sun and 35.6 AU from the Earth.
The TNO is moving 7.7 km/sec on the sky relative to the star, or, 1.1 arcsec/hr.
The 1-sigma error in the time of the event is 235 seconds.
The 1-sigma cross-track error in the shadow position is 1786 km.
The sky-plane scale is 25795.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.2
Diameter=217.8 km assuming a 5% albedo -- 28.1 sec chord
Diameter=88.9 km assuming a 30% albedo -- 11.5 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 12DY98, (2019/12/31 12:37UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:15.0 -11:15:54  1.0 11.46 136
38 Vir         12:54:12.7 -03:39:41  6.1  0.85 147
PPM 195867     12:50:12.0 -03:48:29  9.5  0.19 148
12DY98         12:50:54.5 -03:52:06 15.5       147
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 3.8 sigma about the mid-time.
The median site spacing is 14.2 km RECON observability=1.0 and success probability=7.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 12:27:24 -32.3 Dark Down 32.1 149.7 Up 12:12:24 - 12:42:24 4142
Summerland 12:27:18 -32.5 Dark Down 32.0 149.3 Up 12:12:18 - 12:42:18 4125
Penticton 12:27:23 -32.4 Dark Down 32.3 149.4 Up 12:12:23 - 12:42:23 4108
Okanagan Falls 12:27:23 -32.4 Dark Down 32.5 149.3 Up 12:12:23 - 12:42:23 4093
Oliver 12:27:23 -32.4 Dark Down 32.6 149.3 Up 12:12:23 - 12:42:23 4081
Anarchist Mountain Observatory 12:27:25 -32.3 Dark Down 32.8 149.5 Up 12:12:25 - 12:42:25 4075
Oroville 12:27:24 -32.3 Dark Down 32.9 149.4 Up 12:12:24 - 12:42:24 4067
Tonasket 12:27:25 -32.3 Dark Down 33.1 149.3 Up 12:12:25 - 12:42:25 4049
Okanogan 12:27:25 -32.4 Dark Down 33.3 149.0 Up 12:12:25 - 12:42:25 4018
Niwot 12:29:41 -20.9 Dark Down 45.1 165.0 Up 12:14:41 - 12:44:41 4004
SwRI 12:29:43 -20.9 Dark Down 45.2 164.8 Up 12:14:43 - 12:44:43 3992
Brewster 12:27:23 -32.6 Dark Down 33.5 148.7 Up 12:12:23 - 12:42:23 3989
Manson/Chelan 12:27:19 -32.8 Dark Down 33.5 148.2 Up 12:12:19 - 12:42:19 3958
Entiat 12:27:19 -32.9 Dark Down 33.7 148.0 Up 12:12:19 - 12:42:19 3938
Wenatchee 12:27:17 -33.0 Dark Down 33.8 147.8 Up 12:12:17 - 12:42:17 3915
Ellensburg 12:27:13 -33.1 Dark Down 34.1 147.4 Up 12:12:13 - 12:42:13 3873
Pasco 12:27:29 -32.1 Dark Down 35.3 148.8 Up 12:12:29 - 12:42:29 3870
PNWRO 12:27:27 -31.9 Dark Down 35.6 149.0 Up 12:12:27 - 12:42:27 3860
Yakima 12:27:17 -33.1 Dark Down 34.5 147.2 Up 12:12:17 - 12:42:17 3840
George/Umatilla 12:27:27 -32.3 Dark Down 35.5 148.4 Up 12:12:27 - 12:42:27 3835
Toppenish/White Swan 12:27:19 -33.0 Dark Down 34.7 147.4 Up 12:12:19 - 12:42:19 3830
Goldendale 12:27:17 -33.3 Dark Down 35.0 146.7 Up 12:12:17 - 12:42:17 3769
The Dalles 12:27:14 -33.6 Dark Down 35.0 146.1 Up 12:12:14 - 12:42:14 3736
Maupin 12:27:17 -33.5 Dark Down 35.4 146.1 Up 12:12:17 - 12:42:17 3706
Madras/Culver 12:27:13 -33.5 Dark Down 35.9 145.8 Up 12:12:13 - 12:42:13 3660
Redmond 12:27:16 -33.6 Dark Down 36.1 145.6 Up 12:12:16 - 12:42:16 3628
Sisters 12:27:11 -33.9 Dark Down 36.0 145.2 Up 12:12:11 - 12:42:11 3614
Bend 12:27:15 -33.7 Dark Down 36.3 145.4 Up 12:12:15 - 12:42:15 3605
Oregon Observatory 12:27:14 -33.8 Dark Down 36.3 145.2 Up 12:12:14 - 12:42:14 3585
La Pine/Gilchrist 12:27:15 -33.8 Dark Down 36.5 145.0 Up 12:12:15 - 12:42:15 3566
North Lake 12:27:20 -33.3 Dark Down 37.1 145.5 Up 12:12:20 - 12:42:20 3555
Paisley 12:27:24 -33.0 Dark Down 37.7 145.7 Up 12:12:24 - 12:42:24 3524
Lakeview 12:27:26 -32.9 Dark Down 38.2 145.7 Up 12:12:26 - 12:42:26 3490
Chiloquin 12:27:13 -34.0 Dark Down 37.2 144.1 Up 12:12:13 - 12:42:13 3458
Cedarville 12:27:26 -32.7 Dark Down 38.8 145.6 Up 12:12:26 - 12:42:26 3443
Klamath Falls 12:27:13 -34.0 Dark Down 37.6 144.1 Up 12:12:13 - 12:42:13 3433
Tulelake 12:27:13 -33.7 Dark Down 37.9 144.3 Up 12:12:13 - 12:42:13 3423
Fall River/Burney 12:27:18 -33.6 Dark Down 38.7 144.0 Up 12:12:18 - 12:42:18 3350
Susanville 12:27:27 -33.0 Dark Down 39.5 144.6 Up 12:12:27 - 12:42:27 3328
Gimple 12:27:26 -33.2 Dark Down 39.7 144.2 Up 12:12:26 - 12:42:26 3295
Greenville 12:27:22 -33.2 Dark Down 39.6 144.1 Up 12:12:22 - 12:42:22 3292
Reno 12:27:34 -32.3 Dark Down 40.6 145.2 Up 12:12:34 - 12:42:34 3291
Portola 12:27:31 -32.8 Dark Down 40.1 144.5 Up 12:12:31 - 12:42:31 3285
Tonopah 12:28:02 -30.0 Dark Down 43.1 147.7 Up 12:13:02 - 12:43:02 3282
Quincy 12:27:22 -33.2 Dark Down 39.8 144.0 Up 12:12:22 - 12:42:22 3275
Yerington 12:27:43 -31.7 Dark Down 41.4 145.7 Up 12:12:43 - 12:42:43 3273
Carson City 12:27:37 -32.2 Dark Down 41.0 145.0 Up 12:12:37 - 12:42:37 3261
Hawthorne 12:27:45 -31.2 Dark Down 42.0 146.1 Up 12:12:45 - 12:42:45 3257
Gardnerville 12:27:34 -32.2 Dark Down 41.2 144.9 Up 12:12:34 - 12:42:34 3242
Indian Springs 12:28:20 -28.5 Dark Down 45.0 149.0 Up 12:13:20 - 12:43:20 3229
DCO 12:28:51 -26.2 Dark Down 47.3 151.7 Up 12:13:51 - 12:43:51 3226
Patrick 12:28:39 -26.8 Dark Down 46.8 150.9 Up 12:13:39 - 12:43:39 3218
Henderson 12:28:26 -27.9 Dark Down 45.7 149.7 Up 12:13:26 - 12:43:26 3216
Beatty 12:28:08 -29.5 Dark Down 44.2 147.7 Up 12:13:08 - 12:43:08 3206
Kingman/Dolan Springs 12:28:38 -27.0 Dark Down 46.9 150.5 Up 12:13:38 - 12:43:38 3190
Lee Vining 12:27:41 -31.6 Dark Down 42.3 145.2 Up 12:12:41 - 12:42:41 3187
Searchlight/Boulder City 12:28:28 -27.7 Dark Down 46.3 149.4 Up 12:13:28 - 12:43:28 3171
Bishop 12:27:52 -30.9 Dark Down 43.1 145.9 Up 12:12:52 - 12:42:52 3169
Laughlin/Bullhead City 12:28:33 -27.4 Dark Down 46.7 149.8 Up 12:13:33 - 12:43:33 3162
Mohave Valley 12:28:37 -27.3 Dark Down 46.9 149.7 Up 12:13:37 - 12:43:37 3140
Lone Pine 12:27:55 -30.5 Dark Down 43.9 145.9 Up 12:12:55 - 12:42:55 3119
Lake Havasu City 12:28:39 -27.0 Dark Down 47.4 149.8 Up 12:13:39 - 12:43:39 3118
Parker 12:28:38 -27.0 Dark Down 47.7 149.6 Up 12:13:38 - 12:43:38 3089
Blythe 12:28:39 -27.1 Dark Down 48.0 148.9 Up 12:13:39 - 12:43:39 3030
Yuma 12:28:41 -26.9 Dark Down 48.8 148.3 Up 12:13:41 - 12:43:41 2948
Calipatria 12:28:32 -27.8 Dark Down 48.0 147.3 Up 12:13:32 - 12:43:32 2941
Idyllwild 12:28:18 -28.9 Dark Down 46.9 146.1 Up 12:13:18 - 12:43:18 2936
CPSLO 12:27:40 -32.5 Dark Down 43.7 141.9 Up 12:12:40 - 12:42:40 2885
Wildwood 12:27:59 -30.6 Dark Down 45.7 143.8 Up 12:12:59 - 12:42:59 2876

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 12DY98, (2019/12/31 12:37UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 11.46 136
38 Vir         12:53:10.8 -03:33:11  6.1  0.85 147
PPM 195867     12:49:10.1 -03:41:58  9.5  0.19 148
12DY98         12:49:52.6 -03:45:34 15.5       147
Positions are for J2000

Event circumstances last updated at 2019/01/30 20:49:55 UT

Marc W. Buie, Southwest Research Institute

RECON