RECON: TNO occultation with 48639

Event between (48639) 95TL8 and star UC4-542-006071 with event index number of 95650

Geocentric closest approach at 2017/12/10 07:08:52 UTC

J2000 position of star is 03:16:46.1 +18:17:27
Equinox of date position of star is 03:17:47.2 +18:21:21
Stellar brightness R=15.5, use SENSEUP=128
Star is 116 degrees from the moon. Moon is 50% illuminated.
TNO apparent brightness V=21.4

[RECON map]
TNO is 45.4 AU from the Sun and 44.5 AU from the Earth.
The TNO is moving 22.4 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 222 seconds.
The 1-sigma cross-track error in the shadow position is 2587 km.
The sky-plane scale is 32298.7 km/arcsec.

The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 29.6 sec chord
Diameter=269.7 km assuming a 30% albedo -- 12.1 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 48639, (2017/12/10 07:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.1 +16:32:38  0.8 18.96  98
Menkar         03:03:13.2 +04:09:33  2.5 14.64 123
57Del Ari      03:12:39.5 +19:47:36  4.3  1.88 117
PPM 118985     03:19:21.1 +18:14:08  7.8  0.39 116
PPM 118959     03:16:46.1 +18:32:59  9.9  0.31 117
48639          03:17:47.2 +18:21:22 15.5       116
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 4.1 sigma about the mid-time.
The median site spacing is 23.9 km RECON observability=1.0 and success probability=9.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 07:07:21 -62.6 Dark Down 56.3 210.8 Up 06:52:21 - 07:22:21 5344
Tonasket 07:07:21 -62.8 Dark Down 56.5 211.0 Up 06:52:21 - 07:22:21 5321
Okanogan 07:07:21 -63.1 Dark Down 56.8 211.0 Up 06:52:21 - 07:22:21 5290
Brewster 07:07:22 -63.3 Dark Down 57.1 210.9 Up 06:52:22 - 07:22:22 5266
Manson/Chelan 07:07:22 -63.4 Dark Down 57.4 210.5 Up 06:52:22 - 07:22:22 5250
Entiat 07:07:23 -63.6 Dark Down 57.6 210.5 Up 06:52:23 - 07:22:23 5229
Wenatchee 07:07:24 -63.8 Dark Down 57.9 210.6 Up 06:52:24 - 07:22:24 5205
Ellensburg 07:07:25 -64.1 Dark Down 58.3 210.5 Up 06:52:25 - 07:22:25 5167
Yakima 07:07:25 -64.5 Dark Down 58.7 210.8 Up 06:52:25 - 07:22:25 5126
Toppenish/White Swan 07:07:24 -64.7 Dark Down 58.8 211.3 Up 06:52:24 - 07:22:24 5103
Pasco 07:07:20 -65.2 Dark Down 58.4 213.5 Up 06:52:20 - 07:22:20 5075
Goldendale 07:07:25 -65.1 Dark Down 59.4 211.1 Up 06:52:25 - 07:22:25 5053
PNWRO 07:07:19 -65.5 Dark Down 58.6 214.1 Up 06:52:19 - 07:22:19 5048
George/Umatilla 07:07:20 -65.4 Dark Down 58.8 213.5 Up 06:52:20 - 07:22:20 5044
The Dalles 07:07:26 -65.2 Dark Down 59.7 210.6 Up 06:52:26 - 07:22:26 5035
Maupin 07:07:26 -65.6 Dark Down 60.1 211.2 Up 06:52:26 - 07:22:26 4992
Madras/Culver 07:07:26 -66.0 Dark Down 60.6 211.6 Up 06:52:26 - 07:22:26 4937
Sisters 07:07:28 -66.2 Dark Down 61.0 211.1 Up 06:52:28 - 07:22:28 4910
Redmond 07:07:27 -66.3 Dark Down 60.9 211.9 Up 06:52:27 - 07:22:27 4902
Bend 07:07:27 -66.5 Dark Down 61.1 211.8 Up 06:52:27 - 07:22:27 4882
Oregon Observatory 07:07:28 -66.6 Dark Down 61.3 211.8 Up 06:52:28 - 07:22:28 4867
La Pine/Gilchrist 07:07:28 -66.7 Dark Down 61.5 211.8 Up 06:52:28 - 07:22:28 4847
North Lake 07:07:26 -67.3 Dark Down 61.6 213.4 Up 06:52:26 - 07:22:26 4794
Chiloquin 07:07:29 -67.5 Dark Down 62.6 212.3 Up 06:52:29 - 07:22:29 4738
Paisley 07:07:25 -67.9 Dark Down 61.9 214.6 Up 06:52:25 - 07:22:25 4733
Klamath Falls 07:07:29 -67.8 Dark Down 62.8 212.8 Up 06:52:29 - 07:22:29 4702
Lakeview 07:07:25 -68.4 Dark Down 62.3 215.5 Up 06:52:25 - 07:22:25 4678
Tulelake 07:07:29 -68.2 Dark Down 62.9 213.7 Up 06:52:29 - 07:22:29 4670
Cedarville 07:07:24 -69.1 Dark Down 62.7 216.5 Up 06:52:24 - 07:22:24 4608
Fall River/Burney 07:07:29 -69.0 Dark Down 63.7 214.8 Up 06:52:29 - 07:22:29 4576
Susanville 07:07:26 -69.8 Dark Down 63.8 217.0 Up 06:52:26 - 07:22:26 4500
Greenville 07:07:27 -69.9 Dark Down 64.2 216.8 Up 06:52:27 - 07:22:27 4475
Gimple 07:07:27 -69.9 Dark Down 64.2 216.9 Up 06:52:27 - 07:22:27 4474
Quincy 07:07:27 -70.1 Dark Down 64.4 217.0 Up 06:52:27 - 07:22:27 4454
Portola 07:07:25 -70.4 Dark Down 64.2 218.1 Up 06:52:25 - 07:22:25 4435
Reno 07:07:23 -70.9 Dark Down 64.1 219.6 Up 06:52:23 - 07:22:23 4398
Carson City 07:07:23 -71.2 Dark Down 64.4 220.2 Up 06:52:23 - 07:22:23 4360
Gardnerville 07:07:24 -71.4 Dark Down 64.6 220.6 Up 06:52:24 - 07:22:24 4334
Yerington 07:07:21 -71.6 Dark Down 64.2 221.6 Up 06:52:21 - 07:22:21 4331
Niwot 07:06:33 -72.6 Dark Up 55.2 240.4 Up 06:51:33 - 07:21:33 4316
Hawthorne 07:07:19 -72.2 Dark Down 64.3 223.2 Up 06:52:19 - 07:22:19 4275
Lee Vining 07:07:22 -72.5 Dark Down 65.0 223.1 Up 06:52:22 - 07:22:22 4222
Tonopah 07:07:14 -73.2 Dark Down 63.9 226.3 Up 06:52:14 - 07:22:14 4208
Bishop 07:07:19 -73.3 Dark Down 65.0 225.3 Up 06:52:19 - 07:22:19 4149
Beatty 07:07:13 -74.4 Dark Down 64.4 228.9 Up 06:52:13 - 07:22:13 4079
Lone Pine 07:07:18 -74.1 Dark Down 65.3 227.1 Up 06:52:18 - 07:22:18 4064
Indian Springs 07:07:09 -75.0 Dark Down 63.9 231.1 Up 06:52:09 - 07:22:09 4031
Henderson 07:07:07 -75.8 Dark Down 63.8 233.1 Up 06:52:07 - 07:22:07 3966
CPSLO 07:07:28 -73.8 Dark Down 67.7 224.4 Up 06:52:28 - 07:22:28 3963
Searchlight/Boulder City 07:07:06 -76.3 Dark Down 64.1 234.1 Up 06:52:06 - 07:22:06 3904
Patrick 07:07:02 -76.7 Dark Down 63.5 235.8 Up 06:52:02 - 07:22:02 3886
Laughlin/Bullhead City 07:07:05 -76.7 Dark Down 64.1 235.2 Up 06:52:05 - 07:22:05 3868
Kingman/Dolan Springs 07:07:03 -76.8 Dark Down 63.7 235.9 Up 06:52:03 - 07:22:03 3864
DCO 07:07:00 -77.2 Dark Down 63.2 237.4 Up 06:52:00 - 07:22:00 3846
Mohave Valley 07:07:05 -76.9 Dark Down 64.2 235.6 Up 06:52:05 - 07:22:05 3839
Wildwood 07:07:21 -75.8 Dark Down 67.3 230.4 Up 06:52:21 - 07:22:21 3804
Lake Havasu City 07:07:04 -77.4 Dark Down 64.3 236.7 Up 06:52:04 - 07:22:04 3793
Parker 07:07:04 -77.7 Dark Down 64.4 237.4 Up 06:52:04 - 07:22:04 3754
Idyllwild 07:07:14 -77.1 Dark Down 66.3 234.4 Up 06:52:14 - 07:22:14 3740
Blythe 07:07:05 -78.1 Dark Down 64.9 237.9 Up 06:52:05 - 07:22:05 3701
Calipatria 07:07:09 -78.1 Dark Down 65.8 237.4 Up 06:52:09 - 07:22:09 3659
Yuma 07:07:06 -78.9 Dark Down 65.4 239.5 Up 06:52:06 - 07:22:06 3602

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 48639, (2017/12/10 07:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 18.96  98
Menkar         03:02:16.8 +04:05:22  2.5 14.64 123
57Del Ari      03:11:37.9 +19:43:36  4.3  1.88 117
PPM 118985     03:18:19.9 +18:10:16  7.8  0.39 116
PPM 118959     03:15:44.9 +18:29:04  9.9  0.31 117
48639          03:16:46.1 +18:17:27 15.5       116
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:05:15 UT

Marc W. Buie, Southwest Research Institute

RECON