RECON: TNO occultation with 54598

Event between (54598) Bienor and star UC4-667-021829 with event index number of 310875

Geocentric closest approach at 2019/12/13 08:14:04 UTC

J2000 position of star is 04:01:55.1 +43:18:32
Equinox of date position of star is 04:03:15.2 +43:21:41
Stellar brightness R=15.4, use SENSEUP=128
Star is 35 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=19.2

[RECON map]
TNO is 14.5 AU from the Sun and 13.6 AU from the Earth.
The TNO is moving 21.4 km/sec on the sky relative to the star, or, 7.8 arcsec/hr.
The 1-sigma error in the time of the event is 32 seconds.
The 1-sigma cross-track error in the shadow position is 537 km.
The sky-plane scale is 9856.1 km/arcsec.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 8.9 sec chord
Diameter=77.8 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 54598, (2019/12/13 08:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:04.1 +16:32:52  0.8 27.76  26
Mirphak        03:25:45.4 +49:55:50  1.8  9.19  44
PPM 046552     03:50:31.1 +44:01:24  6.1  2.40  38
PPM 046765     04:05:37.6 +43:05:31  8.5  0.50  35
PPM 046760     04:05:20.9 +43:25:48  9.0  0.38  35
PPM 046723     04:03:25.8 +43:08:42 10.3  0.22  35
54598          04:03:18.3 +43:21:48 15.4        35
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 24.5 km RECON observability=1.0 and success probability=36.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:12:33 -62.9 Dark Up 71.7 258.5 Up 08:09:25 - 08:15:40 2160
Summerland 08:12:34 -63.2 Dark Up 71.9 259.1 Up 08:09:27 - 08:15:42 2128
Penticton 08:12:34 -63.3 Dark Up 71.9 259.4 Up 08:09:26 - 08:15:41 2120
Okanagan Falls 08:12:34 -63.5 Dark Up 71.9 259.9 Up 08:09:26 - 08:15:41 2100
Oliver 08:12:34 -63.6 Dark Up 71.9 260.5 Up 08:09:26 - 08:15:41 2081
Anarchist Mountain Observatory 08:12:33 -63.8 Dark Up 71.9 261.2 Up 08:09:25 - 08:15:40 2062
Oroville 08:12:34 -63.9 Dark Up 71.9 261.3 Up 08:09:26 - 08:15:41 2054
Tonasket 08:12:33 -64.1 Dark Up 71.9 262.0 Up 08:09:26 - 08:15:41 2028
Okanogan 08:12:34 -64.4 Dark Up 72.1 262.9 Up 08:09:26 - 08:15:41 1991
Brewster 08:12:35 -64.7 Dark Up 72.2 263.6 Up 08:09:27 - 08:15:42 1961
Manson/Chelan 08:12:36 -65.0 Dark Up 72.5 263.9 Up 08:09:28 - 08:15:43 1939
Entiat 08:12:36 -65.2 Dark Up 72.6 264.5 Up 08:09:29 - 08:15:44 1915
Wenatchee 08:12:37 -65.5 Dark Up 72.7 265.2 Up 08:09:29 - 08:15:44 1887
Ellensburg 08:12:37 -65.9 Dark Up 72.8 266.3 Up 08:09:30 - 08:15:45 1841
Yakima 08:12:37 -66.3 Dark Up 72.9 267.6 Up 08:09:30 - 08:15:45 1796
Toppenish/White Swan 08:12:37 -66.5 Dark Up 72.8 268.5 Up 08:09:29 - 08:15:44 1772
Pasco 08:12:33 -66.5 Dark Up 71.9 269.8 Up 08:09:25 - 08:15:40 1755
PNWRO 08:12:31 -66.7 Dark Up 71.7 270.7 Up 08:09:24 - 08:15:39 1727
George/Umatilla 08:12:34 -66.8 Dark Up 72.1 270.7 Up 08:09:26 - 08:15:41 1718
Goldendale 08:12:38 -67.1 Dark Up 73.1 270.0 Up 08:09:31 - 08:15:46 1712
The Dalles 08:12:40 -67.4 Dark Up 73.3 270.4 Up 08:09:32 - 08:15:47 1688
Maupin 08:12:40 -67.8 Dark Up 73.2 271.9 Up 08:09:32 - 08:15:47 1641
Madras/Culver 08:12:40 -68.3 Dark Up 73.2 273.7 Up 08:09:32 - 08:15:47 1581
Sisters 08:12:42 -68.7 Dark Up 73.5 274.6 Up 08:09:34 - 08:15:49 1546
Redmond 08:12:40 -68.7 Dark Up 73.2 274.9 Up 08:09:33 - 08:15:48 1541
Bend 08:12:41 -68.9 Dark Up 73.3 275.5 Up 08:09:33 - 08:15:48 1518
Oregon Observatory 08:12:41 -69.1 Dark Up 73.4 276.0 Up 08:09:34 - 08:15:49 1499
La Pine/Gilchrist 08:12:41 -69.3 Dark Up 73.4 276.7 Up 08:09:34 - 08:15:49 1477
North Lake 08:12:40 -69.6 Dark Up 72.9 278.3 Up 08:09:32 - 08:15:47 1426
Paisley 08:12:38 -70.1 Dark Up 72.6 280.2 Up 08:09:31 - 08:15:46 1364
Chiloquin 08:12:43 -70.4 Dark Up 73.5 280.3 Up 08:09:36 - 08:15:51 1356
Klamath Falls 08:12:43 -70.8 Dark Up 73.4 281.4 Up 08:09:36 - 08:15:51 1317
Lakeview 08:12:38 -70.6 Dark Up 72.4 281.8 Up 08:09:30 - 08:15:45 1307
Tulelake 08:12:42 -71.0 Dark Up 73.1 282.4 Up 08:09:35 - 08:15:50 1286
Cedarville 08:12:37 -71.2 Dark Up 72.1 283.8 Up 08:09:30 - 08:15:45 1234
Fall River/Burney 08:12:42 -71.9 Dark Up 72.8 285.2 Up 08:09:35 - 08:15:50 1185
Niwot 08:11:44 -66.5 Dark Up 61.0 289.3 Up 08:08:36 - 08:14:51 1146
SwRI 08:11:44 -66.6 Dark Up 61.0 289.5 Up 08:08:36 - 08:14:51 1133
Susanville 08:12:39 -72.4 Dark Up 72.1 287.1 Up 08:09:32 - 08:15:47 1113
Greenville 08:12:41 -72.7 Dark Up 72.3 288.0 Up 08:09:33 - 08:15:48 1083
Gimple 08:12:41 -72.7 Dark Up 72.2 288.0 Up 08:09:33 - 08:15:48 1083
Quincy 08:12:41 -72.9 Dark Up 72.2 288.6 Up 08:09:33 - 08:15:48 1061
Portola 08:12:39 -72.9 Dark Up 71.8 288.9 Up 08:09:31 - 08:15:46 1045
Reno 08:12:36 -73.1 Dark Up 71.3 289.6 Up 08:09:29 - 08:15:44 1014
Carson City 08:12:37 -73.4 Dark Up 71.1 290.6 Up 08:09:29 - 08:15:44 974
Yerington 08:12:34 -73.5 Dark Up 70.6 291.0 Up 08:09:27 - 08:15:42 951
Gardnerville 08:12:37 -73.6 Dark Up 71.0 291.2 Up 08:09:29 - 08:15:44 947
Hawthorne 08:12:32 -73.8 Dark Up 70.0 292.1 Up 08:09:25 - 08:15:40 899
Tonopah 08:12:27 -73.8 Dark Up 68.9 293.0 Up 08:09:20 - 08:15:35 846
Lee Vining 08:12:35 -74.4 Dark Up 70.2 293.6 Up 08:09:27 - 08:15:42 838
Bishop 08:12:32 -74.8 Dark Up 69.4 294.9 Up 08:09:24 - 08:15:39 771
Beatty 08:12:26 -74.7 Dark Up 68.1 295.6 Up 08:09:18 - 08:15:33 720
Lone Pine 08:12:31 -75.4 Dark Up 68.8 296.6 Up 08:09:23 - 08:15:38 687
Indian Springs 08:12:22 -74.5 Dark Up 67.1 296.0 Up 08:09:14 - 08:15:29 685
Henderson 08:12:19 -74.6 Dark Up 66.4 297.0 Up 08:09:11 - 08:15:26 628
Searchlight/Boulder City 08:12:19 -75.1 Dark Up 66.1 298.1 Up 08:09:11 - 08:15:26 565
Patrick 08:12:15 -74.6 Dark Up 65.3 297.9 Up 08:09:07 - 08:15:22 563
CPSLO 08:12:42 -77.3 Dark Up 70.0 300.8 Up 08:09:34 - 08:15:49 553
Kingman/Dolan Springs 08:12:16 -74.9 Dark Up 65.4 298.4 Up 08:09:08 - 08:15:23 538
Laughlin/Bullhead City 08:12:18 -75.1 Dark Up 65.7 298.6 Up 08:09:10 - 08:15:25 534
DCO 08:12:12 -74.4 Dark Up 64.7 298.3 Up 08:09:05 - 08:15:20 532
Mohave Valley 08:12:18 -75.3 Dark Up 65.6 299.1 Up 08:09:10 - 08:15:25 504
Lake Havasu City 08:12:17 -75.5 Dark Up 65.2 299.8 Up 08:09:09 - 08:15:24 462
Parker 08:12:17 -75.8 Dark Up 65.0 300.5 Up 08:09:09 - 08:15:24 424
Wildwood 08:12:34 -77.8 Dark Up 68.0 302.4 Up 08:09:27 - 08:15:42 415
Idyllwild 08:12:27 -77.3 Dark Up 66.5 302.2 Up 08:09:19 - 08:15:34 375
Blythe 08:12:18 -76.3 Dark Up 64.9 301.5 Up 08:09:11 - 08:15:26 366
Calipatria 08:12:22 -77.2 Dark Up 65.3 302.8 Up 08:09:15 - 08:15:30 311
Yuma 08:12:19 -77.0 Dark Up 64.5 303.2 Up 08:09:11 - 08:15:26 266

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 54598, (2019/12/13 08:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 27.76  26
Mirphak        03:24:19.4 +49:51:40  1.8  9.19  44
PPM 046552     03:49:08.1 +43:57:49  6.1  2.40  38
PPM 046765     04:04:14.4 +43:02:18  8.5  0.50  35
PPM 046760     04:03:57.4 +43:22:35  9.0  0.38  35
PPM 046723     04:02:02.7 +43:05:26 10.3  0.22  35
54598          04:01:55.1 +43:18:32 15.4        35
Positions are for J2000

Event circumstances last updated at 2019/03/13 21:54:14 UT

Marc W. Buie, Southwest Research Institute

RECON