RECON: TNO occultation with 54598

Event between (54598) Bienor and star UC4-672-032094 with event index number of 311046

Geocentric closest approach at 2020/10/18 08:16:07 UTC

J2000 position of star is 04:56:42.0 +44:18:50
Equinox of date position of star is 04:58:03.6 +44:20:31
Stellar brightness R=15.6, use SENSEUP=128
Star is 141 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=19.3

[RECON map]
TNO is 14.3 AU from the Sun and 13.7 AU from the Earth.
The TNO is moving 13.0 km/sec on the sky relative to the star, or, 4.7 arcsec/hr.
The 1-sigma error in the time of the event is 65 seconds.
The 1-sigma cross-track error in the shadow position is 646 km.
The sky-plane scale is 9911.9 km/arcsec.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 14.7 sec chord
Diameter=77.8 km assuming a 30% albedo -- 6.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 54598, (2020/10/18 08:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:07.0 +16:32:58  0.8 28.15 157
3Iot Aur       04:58:21.1 +33:11:50  2.7 11.15 148
PPM 047482     04:56:21.0 +44:05:34  6.0  0.42 142
PPM 047546     04:59:59.4 +44:27:44  8.9  0.34 141
PPM 047516     04:57:51.7 +44:30:05 10.5  0.17 141
54598          04:58:12.1 +44:20:42 15.6       141
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 24.3 km RECON observability=1.0 and success probability=50.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:20:00 -49.2 Dark Down 61.7 85.3 Up 08:14:04 - 08:25:56 82
Summerland 08:20:02 -49.3 Dark Down 61.5 85.0 Up 08:14:06 - 08:25:58 77
Penticton 08:20:01 -49.6 Dark Down 61.6 84.5 Up 08:14:05 - 08:25:57 42
Okanagan Falls 08:20:01 -49.8 Dark Down 61.6 84.2 Up 08:14:05 - 08:25:57 21
Oliver 08:20:01 -49.9 Dark Down 61.6 83.9 Up 08:14:05 - 08:25:57 3
Anarchist Mountain Observatory 08:20:00 -50.0 Dark Down 61.7 83.7 Up 08:14:04 - 08:25:56 -17
Oroville 08:20:00 -50.1 Dark Down 61.6 83.5 Up 08:14:04 - 08:25:56 -25
Tonasket 08:20:00 -50.4 Dark Down 61.6 83.1 Up 08:14:04 - 08:25:56 -51
Okanogan 08:20:01 -50.7 Dark Down 61.4 82.4 Up 08:14:05 - 08:25:57 -88
Brewster 08:20:02 -51.0 Dark Down 61.3 81.8 Up 08:14:06 - 08:25:58 -118
Manson/Chelan 08:20:04 -51.3 Dark Down 61.0 81.2 Up 08:14:08 - 08:26:00 -141
Entiat 08:20:04 -51.5 Dark Down 60.9 80.8 Up 08:14:08 - 08:26:00 -166
Wenatchee 08:20:04 -51.7 Dark Down 60.8 80.3 Up 08:14:08 - 08:26:00 -194
Ellensburg 08:20:05 -52.2 Dark Down 60.6 79.4 Up 08:14:09 - 08:26:01 -239
Yakima 08:20:05 -52.6 Dark Down 60.5 78.7 Up 08:14:09 - 08:26:01 -284
Toppenish/White Swan 08:20:04 -52.8 Dark Down 60.6 78.4 Up 08:14:08 - 08:26:00 -308
Pasco 08:19:57 -52.7 Dark Down 61.4 78.8 Up 08:14:01 - 08:25:53 -322
PNWRO 08:19:56 -52.9 Dark Down 61.5 78.4 Up 08:14:00 - 08:25:52 -349
George/Umatilla 08:19:59 -53.0 Dark Down 61.2 78.1 Up 08:14:03 - 08:25:55 -359
Goldendale 08:20:06 -53.4 Dark Down 60.2 77.3 Up 08:14:10 - 08:26:02 -369
The Dalles 08:20:08 -53.6 Dark Down 59.9 76.7 Up 08:14:12 - 08:26:04 -393
Maupin 08:20:07 -54.0 Dark Down 59.9 76.1 Up 08:14:11 - 08:26:03 -440
Madras/Culver 08:20:07 -54.6 Dark Down 59.7 75.1 Up 08:14:11 - 08:26:03 -500
Sisters 08:20:09 -55.0 Dark Down 59.3 74.4 Up 08:14:13 - 08:26:05 -536
Redmond 08:20:07 -54.9 Dark Down 59.6 74.5 Up 08:14:11 - 08:26:03 -539
Bend 08:20:08 -55.2 Dark Down 59.4 74.1 Up 08:14:12 - 08:26:04 -562
Oregon Observatory 08:20:08 -55.4 Dark Down 59.3 73.8 Up 08:14:12 - 08:26:04 -581
La Pine/Gilchrist 08:20:08 -55.6 Dark Down 59.2 73.5 Up 08:14:12 - 08:26:04 -603
North Lake 08:20:05 -55.9 Dark Down 59.5 73.0 Up 08:14:09 - 08:26:01 -652
Paisley 08:20:03 -56.4 Dark Down 59.5 72.2 Up 08:14:07 - 08:25:59 -713
Chiloquin 08:20:10 -56.7 Dark Down 58.6 71.6 Up 08:14:14 - 08:26:06 -724
Klamath Falls 08:20:09 -57.0 Dark Down 58.5 71.1 Up 08:14:13 - 08:26:05 -762
Lakeview 08:20:01 -56.8 Dark Down 59.5 71.4 Up 08:14:05 - 08:25:57 -768
Tulelake 08:20:07 -57.2 Dark Down 58.7 70.7 Up 08:14:11 - 08:26:03 -792
Cedarville 08:20:00 -57.4 Dark Down 59.4 70.4 Up 08:14:04 - 08:25:56 -840
Niwot 08:18:33 -53.4 Dark Down 69.4 69.2 Up 08:12:37 - 08:24:29 -877
Fall River/Burney 08:20:07 -58.1 Dark Down 58.4 69.4 Up 08:14:11 - 08:26:03 -891
Susanville 08:20:02 -58.6 Dark Down 58.7 68.6 Up 08:14:06 - 08:25:58 -961
Greenville 08:20:04 -58.9 Dark Down 58.4 68.1 Up 08:14:08 - 08:26:00 -990
Gimple 08:20:03 -58.9 Dark Down 58.4 68.1 Up 08:14:07 - 08:25:59 -991
Quincy 08:20:04 -59.1 Dark Down 58.3 67.8 Up 08:14:08 - 08:26:00 -1012
Portola 08:20:00 -59.1 Dark Down 58.6 67.7 Up 08:14:04 - 08:25:56 -1027
Reno 08:19:56 -59.2 Dark Down 58.9 67.4 Up 08:14:00 - 08:25:52 -1056
Carson City 08:19:56 -59.6 Dark Down 58.8 66.8 Up 08:14:00 - 08:25:52 -1095
Yerington 08:19:53 -59.6 Dark Down 59.2 66.6 Up 08:13:57 - 08:25:49 -1115
Gardnerville 08:19:56 -59.8 Dark Down 58.7 66.4 Up 08:14:00 - 08:25:52 -1121
Hawthorne 08:19:49 -59.9 Dark Down 59.4 65.9 Up 08:13:53 - 08:25:45 -1165
Tonopah 08:19:40 -60.0 Dark Down 60.2 65.3 Up 08:13:44 - 08:25:36 -1212
Lee Vining 08:19:51 -60.6 Dark Down 58.8 65.0 Up 08:13:55 - 08:25:47 -1226
Bishop 08:19:46 -60.9 Dark Down 59.0 64.2 Up 08:13:50 - 08:25:42 -1289
Beatty 08:19:36 -60.9 Dark Down 60.0 63.5 Up 08:13:40 - 08:25:32 -1335
Indian Springs 08:19:29 -60.8 Dark Down 60.6 62.9 Up 08:13:33 - 08:25:25 -1365
Lone Pine 08:19:43 -61.6 Dark Down 58.9 63.0 Up 08:13:47 - 08:25:39 -1370
Henderson 08:19:24 -61.0 Dark Down 60.8 62.0 Up 08:13:28 - 08:25:20 -1419
Patrick 08:19:17 -61.1 Dark Down 61.3 60.9 Up 08:13:21 - 08:25:13 -1478
Searchlight/Boulder City 08:19:23 -61.5 Dark Down 60.6 61.1 Up 08:13:27 - 08:25:19 -1479
Kingman/Dolan Springs 08:19:17 -61.4 Dark Down 61.0 60.6 Up 08:13:21 - 08:25:13 -1503
DCO 08:19:12 -61.1 Dark Down 61.6 60.3 Up 08:13:16 - 08:25:08 -1505
Laughlin/Bullhead City 08:19:20 -61.6 Dark Down 60.7 60.6 Up 08:13:24 - 08:25:16 -1508
CPSLO 08:19:57 -63.5 Dark Down 56.5 61.2 Up 08:14:01 - 08:25:53 -1509
Mohave Valley 08:19:20 -61.9 Dark Down 60.5 60.2 Up 08:13:24 - 08:25:16 -1537
Lake Havasu City 08:19:18 -62.1 Dark Down 60.5 59.5 Up 08:13:22 - 08:25:14 -1578
Parker 08:19:17 -62.4 Dark Down 60.3 59.0 Up 08:13:21 - 08:25:13 -1615
Wildwood 08:19:43 -64.0 Dark Down 57.3 59.5 Up 08:13:47 - 08:25:39 -1637
Idyllwild 08:19:31 -63.7 Dark Down 58.5 58.8 Up 08:13:35 - 08:25:27 -1670
Blythe 08:19:18 -63.0 Dark Down 59.9 58.3 Up 08:13:22 - 08:25:14 -1672
Calipatria 08:19:23 -63.8 Dark Down 59.0 57.8 Up 08:13:27 - 08:25:19 -1728
Yuma 08:19:17 -63.8 Dark Down 59.3 57.0 Up 08:13:21 - 08:25:13 -1768

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, (2020/10/18 08:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 28.15 157
3Iot Aur       04:56:59.6 +33:09:58  2.7 11.15 148
PPM 047482     04:54:51.2 +44:03:38  6.0  0.42 142
PPM 047546     04:58:29.1 +44:25:55  8.9  0.34 141
PPM 047516     04:56:21.5 +44:28:12 10.5  0.17 141
54598          04:56:42.0 +44:18:50 15.6       141
Positions are for J2000

Event circumstances last updated at 2018/11/05 21:28:04 UT

Marc W. Buie, Southwest Research Institute

RECON