RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-486-019986 with event index number of 233557

Geocentric closest approach at 2019/12/25 08:37:54 UTC

J2000 position of star is 06:15:38.8 +07:06:55
Equinox of date position of star is 06:16:37.6 +07:06:30
Stellar brightness R=16.0, use SENSEUP=128
Star is 161 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=20.1

[RECON map]
TNO is 30.2 AU from the Sun and 29.2 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 74 seconds.
The 1-sigma cross-track error in the shadow position is 1079 km.
The sky-plane scale is 21209.7 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=478.6 km assuming a 5% albedo -- 21.5 sec chord
Diameter=195.4 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2019/12/25 08:38UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:15.2 +07:24:33  0.4  5.09 164
Alhena         06:38:52.0 +16:22:50  1.9 10.74 163
PPM 150217     06:18:03.1 +07:02:38  6.4  0.33 161
PPM 150158     06:16:17.4 +06:53:09  8.7  0.25 161
PPM 150178     06:16:44.1 +07:01:55 10.9  0.08 161
55638          06:16:43.6 +07:06:27 16.0       161
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 23.1 km RECON observability=1.0 and success probability=36.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:37:27 -63.3 Dark Down 47.4 194.1 Up 08:30:49 - 08:44:05 479
Tonasket 08:37:27 -63.5 Dark Down 47.6 194.2 Up 08:30:49 - 08:44:05 459
Okanogan 08:37:27 -63.8 Dark Down 48.0 194.1 Up 08:30:49 - 08:44:05 431
Brewster 08:37:27 -64.1 Dark Down 48.3 193.9 Up 08:30:49 - 08:44:05 408
Manson/Chelan 08:37:28 -64.4 Dark Down 48.5 193.4 Up 08:30:50 - 08:44:06 390
Entiat 08:37:28 -64.6 Dark Down 48.8 193.3 Up 08:30:50 - 08:44:06 371
Wenatchee 08:37:28 -64.9 Dark Down 49.0 193.2 Up 08:30:50 - 08:44:06 350
Ellensburg 08:37:29 -65.4 Dark Down 49.5 193.0 Up 08:30:51 - 08:44:07 314
Yakima 08:37:29 -65.7 Dark Down 49.9 193.1 Up 08:30:51 - 08:44:07 279
Toppenish/White Swan 08:37:28 -65.9 Dark Down 50.0 193.4 Up 08:30:50 - 08:44:06 261
Pasco 08:37:24 -65.7 Dark Down 49.9 195.4 Up 08:30:46 - 08:44:02 253
PNWRO 08:37:24 -65.8 Dark Down 50.1 195.8 Up 08:30:46 - 08:44:02 232
George/Umatilla 08:37:25 -66.1 Dark Down 50.3 195.1 Up 08:30:47 - 08:44:03 224
Goldendale 08:37:29 -66.5 Dark Down 50.6 192.9 Up 08:30:51 - 08:44:07 213
The Dalles 08:37:30 -66.8 Dark Down 50.9 192.4 Up 08:30:52 - 08:44:08 193
Maupin 08:37:30 -67.2 Dark Down 51.3 192.7 Up 08:30:52 - 08:44:08 156
Madras/Culver 08:37:30 -67.7 Dark Down 51.9 192.8 Up 08:30:52 - 08:44:08 108
Sisters 08:37:31 -68.1 Dark Down 52.3 192.2 Up 08:30:53 - 08:44:09 78
Redmond 08:37:30 -68.1 Dark Down 52.2 192.8 Up 08:30:52 - 08:44:08 77
Bend 08:37:30 -68.3 Dark Down 52.4 192.6 Up 08:30:52 - 08:44:08 57
Oregon Observatory 08:37:31 -68.5 Dark Down 52.6 192.5 Up 08:30:53 - 08:44:09 42
La Pine/Gilchrist 08:37:31 -68.7 Dark Down 52.8 192.4 Up 08:30:53 - 08:44:09 23
North Lake 08:37:28 -68.9 Dark Down 53.2 193.5 Up 08:30:50 - 08:44:06 -14
Paisley 08:37:27 -69.4 Dark Down 53.6 194.3 Up 08:30:49 - 08:44:05 -63
Chiloquin 08:37:31 -69.8 Dark Down 54.0 192.2 Up 08:30:53 - 08:44:09 -77
Klamath Falls 08:37:31 -70.1 Dark Down 54.3 192.4 Up 08:30:53 - 08:44:09 -108
Lakeview 08:37:26 -69.8 Dark Down 54.1 194.8 Up 08:30:48 - 08:44:04 -109
Tulelake 08:37:30 -70.3 Dark Down 54.5 193.0 Up 08:30:52 - 08:44:08 -132
Cedarville 08:37:25 -70.3 Dark Down 54.7 195.3 Up 08:30:47 - 08:44:03 -168
Fall River/Burney 08:37:29 -71.1 Dark Down 55.4 193.4 Up 08:30:51 - 08:44:07 -215
Niwot 08:36:35 -63.8 Dark Down 50.8 219.0 Up 08:29:57 - 08:43:13 -249
Susanville 08:37:26 -71.5 Dark Down 55.9 194.9 Up 08:30:48 - 08:44:04 -272
Greenville 08:37:27 -71.8 Dark Down 56.2 194.5 Up 08:30:49 - 08:44:05 -298
Gimple 08:37:27 -71.8 Dark Down 56.2 194.7 Up 08:30:49 - 08:44:05 -298
Quincy 08:37:27 -72.0 Dark Down 56.4 194.6 Up 08:30:49 - 08:44:05 -317
Portola 08:37:25 -71.9 Dark Down 56.4 195.5 Up 08:30:47 - 08:44:03 -328
Reno 08:37:23 -71.9 Dark Down 56.5 196.7 Up 08:30:45 - 08:44:01 -351
Carson City 08:37:23 -72.2 Dark Down 56.9 196.9 Up 08:30:45 - 08:44:01 -385
Yerington 08:37:20 -72.2 Dark Down 56.9 198.1 Up 08:30:42 - 08:43:58 -401
Gardnerville 08:37:23 -72.4 Dark Down 57.1 197.1 Up 08:30:45 - 08:44:01 -408
Hawthorne 08:37:18 -72.3 Dark Down 57.2 199.2 Up 08:30:40 - 08:43:56 -444
Tonopah 08:37:13 -72.0 Dark Down 57.3 202.0 Up 08:30:35 - 08:43:51 -485
Lee Vining 08:37:20 -73.0 Dark Down 57.9 198.7 Up 08:30:42 - 08:43:58 -499
Bishop 08:37:17 -73.2 Dark Down 58.3 200.3 Up 08:30:39 - 08:43:55 -554
Beatty 08:37:11 -72.7 Dark Down 58.2 203.5 Up 08:30:33 - 08:43:49 -594
Indian Springs 08:37:07 -72.3 Dark Down 58.2 205.6 Up 08:30:29 - 08:43:45 -622
Lone Pine 08:37:16 -73.6 Dark Down 58.9 201.3 Up 08:30:38 - 08:43:54 -626
Henderson 08:37:04 -72.3 Dark Down 58.4 207.2 Up 08:30:26 - 08:43:42 -672
Searchlight/Boulder City 08:37:04 -72.6 Dark Down 58.9 207.7 Up 08:30:26 - 08:43:42 -727
Patrick 08:37:00 -72.0 Dark Down 58.5 209.6 Up 08:30:22 - 08:43:38 -729
Kingman/Dolan Springs 08:37:00 -72.3 Dark Down 58.8 209.4 Up 08:30:22 - 08:43:38 -751
Laughlin/Bullhead City 08:37:02 -72.6 Dark Down 59.0 208.5 Up 08:30:24 - 08:43:40 -755
DCO 08:36:57 -71.7 Dark Down 58.5 211.0 Up 08:30:19 - 08:43:35 -756
CPSLO 08:37:24 -75.9 Dark Down 60.8 197.2 Up 08:30:46 - 08:44:02 -758
Mohave Valley 08:37:02 -72.8 Dark Down 59.2 208.8 Up 08:30:24 - 08:43:40 -782
Lake Havasu City 08:37:01 -72.9 Dark Down 59.5 209.5 Up 08:30:23 - 08:43:39 -820
Parker 08:37:01 -73.0 Dark Down 59.8 209.9 Up 08:30:23 - 08:43:39 -855
Wildwood 08:37:16 -75.8 Dark Down 61.4 201.9 Up 08:30:38 - 08:43:54 -872
Idyllwild 08:37:09 -74.9 Dark Down 61.1 205.8 Up 08:30:31 - 08:43:47 -903
Blythe 08:37:01 -73.5 Dark Down 60.4 209.8 Up 08:30:23 - 08:43:39 -908
Calipatria 08:37:04 -74.5 Dark Down 61.2 208.5 Up 08:30:26 - 08:43:42 -959
Yuma 08:37:01 -74.1 Dark Down 61.2 210.5 Up 08:30:23 - 08:43:39 -1000

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 55638, (2019/12/25 08:38UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  5.09 164
Alhena         06:37:42.8 +16:23:57  1.9 10.74 163
PPM 150217     06:16:58.4 +07:03:09  6.4  0.33 161
PPM 150158     06:15:12.8 +06:53:36  8.7  0.25 161
PPM 150178     06:15:39.3 +07:02:23 10.9  0.08 161
55638          06:15:38.8 +07:06:55 16.0       161
Positions are for J2000

Event circumstances last updated at 2018/02/21 17:05:39 UT

Marc W. Buie, Southwest Research Institute

RECON