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 07:11:00 UTC

J2000 position of star is 03:16:46.1 +18:17:27
Equinox of date position of star is 03:17:45.3 +18:21:14
Stellar brightness R=15.5, use SENSEUP=128
Star is 116 degrees from the moon. Moon is 50% illuminated.
TNO apparent brightness V=21.6

[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 246 seconds.
The 1-sigma cross-track error in the shadow position is 2744 km.
The sky-plane scale is 32298.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.0
Diameter=602.6 km assuming a 5% albedo -- 27.0 sec chord
Diameter=246.0 km assuming a 30% albedo -- 11.0 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 48639, (2017/12/10 07:11UT)
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 3.7 sigma about the mid-time.
The median site spacing is 24.0 km RECON observability=1.0 and success probability=10.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 07:09:28 -62.8 Dark Down 56.1 211.6 Up 06:54:28 - 07:24:28 4883
Tonasket 07:09:28 -63.0 Dark Down 56.3 211.8 Up 06:54:28 - 07:24:28 4860
Okanogan 07:09:27 -63.3 Dark Down 56.6 211.8 Up 06:54:27 - 07:24:27 4829
Brewster 07:09:29 -63.5 Dark Down 56.9 211.7 Up 06:54:29 - 07:24:29 4805
Manson/Chelan 07:09:29 -63.6 Dark Down 57.2 211.3 Up 06:54:29 - 07:24:29 4788
Entiat 07:09:30 -63.7 Dark Down 57.5 211.4 Up 06:54:30 - 07:24:30 4767
Wenatchee 07:09:30 -63.9 Dark Down 57.7 211.4 Up 06:54:30 - 07:24:30 4743
Ellensburg 07:09:31 -64.3 Dark Down 58.1 211.4 Up 06:54:31 - 07:24:31 4705
Yakima 07:09:31 -64.6 Dark Down 58.5 211.7 Up 06:54:31 - 07:24:31 4665
Toppenish/White Swan 07:09:31 -64.9 Dark Down 58.6 212.2 Up 06:54:31 - 07:24:31 4641
Pasco 07:09:26 -65.3 Dark Down 58.2 214.4 Up 06:54:26 - 07:24:26 4614
Goldendale 07:09:32 -65.2 Dark Down 59.2 212.0 Up 06:54:32 - 07:24:32 4591
PNWRO 07:09:25 -65.6 Dark Down 58.4 215.0 Up 06:54:25 - 07:24:25 4586
George/Umatilla 07:09:27 -65.6 Dark Down 58.6 214.3 Up 06:54:27 - 07:24:27 4583
The Dalles 07:09:33 -65.3 Dark Down 59.6 211.6 Up 06:54:33 - 07:24:33 4573
Maupin 07:09:32 -65.7 Dark Down 59.9 212.1 Up 06:54:32 - 07:24:32 4530
Madras/Culver 07:09:33 -66.2 Dark Down 60.4 212.6 Up 06:54:33 - 07:24:33 4475
Sisters 07:09:35 -66.3 Dark Down 60.8 212.1 Up 06:54:35 - 07:24:35 4448
Redmond 07:09:34 -66.5 Dark Down 60.7 212.8 Up 06:54:34 - 07:24:34 4440
Bend 07:09:34 -66.6 Dark Down 60.9 212.8 Up 06:54:34 - 07:24:34 4420
Oregon Observatory 07:09:35 -66.7 Dark Down 61.1 212.7 Up 06:54:35 - 07:24:35 4404
La Pine/Gilchrist 07:09:35 -66.9 Dark Down 61.3 212.8 Up 06:54:35 - 07:24:35 4384
North Lake 07:09:33 -67.5 Dark Down 61.4 214.3 Up 06:54:33 - 07:24:33 4332
Chiloquin 07:09:36 -67.7 Dark Down 62.4 213.3 Up 06:54:36 - 07:24:36 4276
Paisley 07:09:32 -68.1 Dark Down 61.7 215.5 Up 06:54:32 - 07:24:32 4271
Klamath Falls 07:09:36 -68.0 Dark Down 62.6 213.8 Up 06:54:36 - 07:24:36 4240
Lakeview 07:09:31 -68.6 Dark Down 62.1 216.4 Up 06:54:31 - 07:24:31 4216
Tulelake 07:09:35 -68.4 Dark Down 62.7 214.7 Up 06:54:35 - 07:24:35 4208
Cedarville 07:09:31 -69.2 Dark Down 62.5 217.5 Up 06:54:31 - 07:24:31 4146
Fall River/Burney 07:09:35 -69.2 Dark Down 63.4 215.8 Up 06:54:35 - 07:24:35 4113
Susanville 07:09:33 -70.0 Dark Down 63.6 218.0 Up 06:54:33 - 07:24:33 4037
Greenville 07:09:34 -70.1 Dark Down 64.0 217.8 Up 06:54:34 - 07:24:34 4013
Gimple 07:09:34 -70.2 Dark Down 63.9 217.9 Up 06:54:34 - 07:24:34 4011
Quincy 07:09:34 -70.3 Dark Down 64.1 218.0 Up 06:54:34 - 07:24:34 3992
Portola 07:09:32 -70.6 Dark Down 64.0 219.1 Up 06:54:32 - 07:24:32 3972
Reno 07:09:30 -71.1 Dark Down 63.9 220.6 Up 06:54:30 - 07:24:30 3936
Carson City 07:09:30 -71.4 Dark Down 64.1 221.1 Up 06:54:30 - 07:24:30 3898
Gardnerville 07:09:30 -71.6 Dark Down 64.3 221.6 Up 06:54:30 - 07:24:30 3871
Yerington 07:09:28 -71.8 Dark Down 64.0 222.5 Up 06:54:28 - 07:24:28 3869
Niwot 07:08:39 -72.5 Dark Up 54.9 241.0 Up 06:53:39 - 07:23:39 3861
Hawthorne 07:09:25 -72.4 Dark Down 64.0 224.1 Up 06:54:25 - 07:24:25 3813
Lee Vining 07:09:27 -72.7 Dark Down 64.7 224.1 Up 06:54:27 - 07:24:27 3760
Tonopah 07:09:21 -73.4 Dark Down 63.6 227.2 Up 06:54:21 - 07:24:21 3746
Bishop 07:09:25 -73.5 Dark Down 64.7 226.3 Up 06:54:25 - 07:24:25 3687
Beatty 07:09:19 -74.6 Dark Down 64.1 229.7 Up 06:54:19 - 07:24:19 3618
Lone Pine 07:09:24 -74.3 Dark Down 65.0 228.0 Up 06:54:24 - 07:24:24 3602
Indian Springs 07:09:15 -75.2 Dark Down 63.6 232.0 Up 06:54:15 - 07:24:15 3570
Henderson 07:09:13 -75.9 Dark Down 63.5 233.9 Up 06:54:13 - 07:24:13 3505
CPSLO 07:09:34 -74.1 Dark Down 67.4 225.4 Up 06:54:34 - 07:24:34 3499
Searchlight/Boulder City 07:09:12 -76.5 Dark Down 63.8 235.0 Up 06:54:12 - 07:24:12 3443
Patrick 07:09:08 -76.8 Dark Down 63.1 236.6 Up 06:54:08 - 07:24:08 3426
Laughlin/Bullhead City 07:09:11 -76.9 Dark Down 63.7 236.0 Up 06:54:11 - 07:24:11 3407
Kingman/Dolan Springs 07:09:10 -77.0 Dark Down 63.4 236.7 Up 06:54:10 - 07:24:10 3404
DCO 07:09:07 -77.3 Dark Down 62.8 238.1 Up 06:54:07 - 07:24:07 3386
Mohave Valley 07:09:11 -77.1 Dark Down 63.9 236.4 Up 06:54:11 - 07:24:11 3378
Wildwood 07:09:27 -76.1 Dark Down 67.0 231.4 Up 06:54:27 - 07:24:27 3341
Lake Havasu City 07:09:10 -77.6 Dark Down 63.9 237.5 Up 06:54:10 - 07:24:10 3332
Parker 07:09:10 -77.9 Dark Down 64.1 238.1 Up 06:54:10 - 07:24:10 3294
Idyllwild 07:09:19 -77.3 Dark Down 66.0 235.2 Up 06:54:19 - 07:24:19 3278
Blythe 07:09:12 -78.3 Dark Down 64.6 238.6 Up 06:54:12 - 07:24:12 3240
Calipatria 07:09:15 -78.3 Dark Down 65.5 238.2 Up 06:54:15 - 07:24:15 3198
Yuma 07:09:12 -79.1 Dark Down 65.1 240.3 Up 06:54:12 - 07:24:12 3141

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 07:11UT)
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 2017/05/17 17:57:09 UT

Marc W. Buie, Southwest Research Institute

RECON