RECON: TNO occultation with 54598

Event between (54598) Bienor and star UC4-639-010721 with event index number of 101221

Geocentric closest approach at 2018/02/01 06:42:44 UTC

J2000 position of star is 02:48:15.5 +37:44:11
Equinox of date position of star is 02:49:23.1 +37:48:37
Stellar brightness R=15.8, use SENSEUP=128
Star is 91 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=19.6

[RECON map]
TNO is 15.0 AU from the Sun and 14.9 AU from the Earth.
The TNO is moving 10.0 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 78 seconds.
The 1-sigma cross-track error in the shadow position is 969 km.
The sky-plane scale is 10773.1 km/arcsec.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 19.0 sec chord
Diameter=77.8 km assuming a 30% albedo -- 7.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 54598, (2018/02/01 06:43UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.6 +16:32:39  0.8 31.79  73
Algol          03:09:21.2 +41:01:27  2.1  5.02  86
16 Per         02:51:43.9 +38:23:31  4.5  0.74  90
PPM 067701     02:46:27.8 +38:08:39  8.2  0.67  91
PPM 067774     02:49:52.5 +37:49:20  9.9  0.10  91
54598          02:49:23.7 +37:48:39 15.8        91
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 4.4 km RECON observability=1.0 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 06:43:02 -66.0 Dark Up 26.6 298.3 Low 06:36:03 - 06:50:01 7290
DCO 06:44:17 -67.3 Dark Up 29.6 297.4 Low 06:37:18 - 06:51:16 7036
Patrick 06:44:15 -66.7 Dark Up 30.3 297.0 Up 06:37:16 - 06:51:14 7000
Kingman/Dolan Springs 06:44:19 -66.8 Dark Up 30.3 297.1 Up 06:37:20 - 06:51:18 6993
Parker 06:44:29 -67.4 Dark Up 30.0 297.6 Low 06:37:30 - 06:51:28 6989
Lake Havasu City 06:44:27 -67.1 Dark Up 30.2 297.4 Up 06:37:28 - 06:51:26 6985
Yuma 06:44:32 -68.2 Dark Up 29.5 298.2 Low 06:37:33 - 06:51:31 6981
Blythe 06:44:32 -67.6 Dark Up 29.9 297.7 Low 06:37:33 - 06:51:31 6977
Mohave Valley 06:44:22 -66.7 Dark Up 30.5 297.1 Up 06:37:23 - 06:51:21 6970
Laughlin/Bullhead City 06:44:20 -66.5 Dark Up 30.7 296.9 Up 06:37:21 - 06:51:19 6968
Searchlight/Boulder City 06:44:18 -66.1 Dark Up 31.1 296.6 Up 06:37:19 - 06:51:17 6949
Henderson 06:44:12 -65.6 Dark Up 31.4 296.3 Up 06:37:13 - 06:51:11 6941
Calipatria 06:44:32 -67.4 Dark Up 30.4 297.7 Up 06:37:33 - 06:51:31 6934
Indian Springs 06:44:09 -64.8 Dark Up 32.1 295.7 Up 06:37:10 - 06:51:08 6902
Idyllwild 06:44:32 -66.2 Dark Up 31.6 297.0 Up 06:37:33 - 06:51:31 6870
Beatty 06:44:08 -64.0 Dark Up 33.1 295.1 Up 06:37:09 - 06:51:07 6846
Tonopah 06:43:59 -62.9 Dark Up 33.9 294.2 Up 06:37:00 - 06:50:58 6811
Lone Pine 06:44:15 -63.5 Dark Up 33.9 294.8 Up 06:37:16 - 06:51:14 6782
Wildwood 06:44:32 -64.8 Dark Up 33.1 296.2 Up 06:37:33 - 06:51:31 6770
Bishop 06:44:08 -62.7 Dark Up 34.4 294.2 Up 06:37:09 - 06:51:07 6759
Hawthorne 06:43:57 -61.8 Dark Up 35.1 293.4 Up 06:36:58 - 06:50:56 6735
Lee Vining 06:44:04 -61.9 Dark Up 35.2 293.5 Up 06:37:05 - 06:51:03 6716
Yerington 06:43:54 -61.1 Dark Up 35.7 292.8 Up 06:36:55 - 06:50:53 6703
Gardnerville 06:43:56 -60.8 Dark Up 36.1 292.6 Up 06:36:57 - 06:50:55 6674
Carson City 06:43:53 -60.7 Dark Up 36.2 292.4 Up 06:36:54 - 06:50:52 6669
Reno 06:43:50 -60.4 Dark Up 36.4 292.2 Up 06:36:51 - 06:50:49 6663
CPSLO 06:44:32 -62.7 Dark Up 35.2 294.7 Up 06:37:33 - 06:51:31 6652
Portola 06:43:49 -59.8 Dark Up 37.0 291.7 Up 06:36:50 - 06:50:48 6627
Cedarville 06:43:30 -58.8 Dark Up 37.4 290.6 Up 06:36:31 - 06:50:29 6620
Susanville 06:43:43 -59.3 Dark Up 37.3 291.2 Up 06:36:44 - 06:50:42 6610
Gimple 06:43:46 -59.4 Dark Up 37.4 291.3 Up 06:36:47 - 06:50:45 6603
PNWRO 06:42:42 -56.0 Dark Up 38.2 287.9 Up 06:35:43 - 06:49:41 6602
Lakeview 06:43:24 -58.2 Dark Up 37.8 290.0 Up 06:36:25 - 06:50:23 6602
Quincy 06:43:49 -59.5 Dark Up 37.3 291.4 Up 06:36:50 - 06:50:48 6601
Greenville 06:43:46 -59.3 Dark Up 37.4 291.3 Up 06:36:47 - 06:50:45 6598
Pasco 06:42:40 -55.7 Dark Up 38.4 287.6 Up 06:35:41 - 06:49:39 6587
Paisley 06:43:19 -57.7 Dark Up 38.1 289.6 Up 06:36:20 - 06:50:18 6585
George/Umatilla 06:42:44 -55.8 Dark Up 38.4 287.7 Up 06:35:45 - 06:49:43 6584
Fall River/Burney 06:43:38 -58.5 Dark Up 38.1 290.4 Up 06:36:39 - 06:50:37 6564
North Lake 06:43:15 -57.1 Dark Up 38.5 289.0 Up 06:36:16 - 06:50:14 6558
Tulelake 06:43:29 -57.8 Dark Up 38.5 289.7 Up 06:36:30 - 06:50:28 6548
Klamath Falls 06:43:27 -57.4 Dark Up 38.8 289.3 Up 06:36:28 - 06:50:26 6529
Redmond 06:43:04 -56.2 Dark Up 39.1 288.0 Up 06:36:05 - 06:50:03 6528
Toppenish/White Swan 06:42:41 -55.0 Dark Up 39.3 286.7 Up 06:35:42 - 06:49:40 6525
Bend 06:43:06 -56.3 Dark Up 39.1 288.1 Up 06:36:07 - 06:50:05 6524
Madras/Culver 06:43:00 -56.0 Dark Up 39.2 287.8 Up 06:36:01 - 06:49:59 6524
La Pine/Gilchrist 06:43:11 -56.5 Dark Up 39.1 288.3 Up 06:36:12 - 06:50:10 6521
Oregon Observatory 06:43:08 -56.4 Dark Up 39.1 288.2 Up 06:36:09 - 06:50:07 6521
Chiloquin 06:43:23 -57.1 Dark Up 39.0 289.0 Up 06:36:24 - 06:50:22 6520
Okanogan 06:42:19 -53.8 Dark Up 39.3 285.6 Up 06:35:20 - 06:49:18 6517
Goldendale 06:42:48 -55.3 Dark Up 39.4 287.0 Up 06:35:49 - 06:49:47 6516
Maupin 06:42:54 -55.6 Dark Up 39.3 287.3 Up 06:35:55 - 06:49:53 6516
Tonasket 06:42:15 -53.6 Dark Up 39.4 285.4 Up 06:35:16 - 06:49:14 6515
Brewster 06:42:22 -53.9 Dark Up 39.4 285.7 Up 06:35:23 - 06:49:21 6514
Yakima 06:42:40 -54.8 Dark Up 39.4 286.5 Up 06:35:41 - 06:49:39 6513
Oroville 06:42:12 -53.4 Dark Up 39.4 285.2 Up 06:35:13 - 06:49:11 6509
Sisters 06:43:05 -56.0 Dark Up 39.4 287.8 Up 06:36:06 - 06:50:04 6507
Wenatchee 06:42:30 -54.2 Dark Up 39.5 285.9 Up 06:35:31 - 06:49:29 6506
Ellensburg 06:42:35 -54.5 Dark Up 39.6 286.2 Up 06:35:36 - 06:49:34 6505
Entiat 06:42:27 -54.1 Dark Up 39.6 285.8 Up 06:35:28 - 06:49:26 6505
The Dalles 06:42:51 -55.3 Dark Up 39.5 286.9 Up 06:35:52 - 06:49:50 6503
Manson/Chelan 06:42:26 -53.9 Dark Up 39.6 285.7 Up 06:35:27 - 06:49:25 6503

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, (2018/02/01 06:43UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 31.79  73
Algol          03:08:10.1 +40:57:20  2.1  5.02  86
16 Per         02:50:35.3 +38:19:05  4.5  0.74  90
PPM 067701     02:45:19.6 +38:04:07  8.2  0.67  91
PPM 067774     02:48:44.3 +37:44:52  9.9  0.10  91
54598          02:48:15.5 +37:44:11 15.8        91
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:14:12 UT

Marc W. Buie, Southwest Research Institute

RECON