RECON: TNO occultation with 54598

Event between (54598) Bienor and star GA1340:02565141 with event index number of 361374

Geocentric closest approach at 2020/10/18 08:14:35 UTC

J2000 position of star is 04:56:42.0 +44:18:49
Equinox of date position of star is 04:58:03.6 +44:20:31
Stellar brightness G=15.7, 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 649 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 08:15UT)
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 15.7       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=45.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:18:29 -49.2 Dark Down 61.5 85.1 Up 08:12:34 - 08:24:25 -55
Summerland 08:18:31 -49.3 Dark Down 61.3 84.7 Up 08:12:36 - 08:24:27 -60
Penticton 08:18:30 -49.6 Dark Down 61.3 84.3 Up 08:12:35 - 08:24:26 -95
Okanagan Falls 08:18:30 -49.8 Dark Down 61.3 83.9 Up 08:12:35 - 08:24:26 -116
Oliver 08:18:30 -50.0 Dark Down 61.3 83.6 Up 08:12:35 - 08:24:26 -135
Anarchist Mountain Observatory 08:18:29 -50.1 Dark Down 61.4 83.5 Up 08:12:34 - 08:24:25 -154
Oroville 08:18:30 -50.2 Dark Down 61.4 83.3 Up 08:12:34 - 08:24:25 -162
Tonasket 08:18:29 -50.4 Dark Down 61.3 82.9 Up 08:12:34 - 08:24:25 -188
Okanogan 08:18:30 -50.8 Dark Down 61.2 82.2 Up 08:12:35 - 08:24:26 -225
Brewster 08:18:31 -51.1 Dark Down 61.0 81.6 Up 08:12:36 - 08:24:27 -255
Manson/Chelan 08:18:33 -51.3 Dark Down 60.8 81.0 Up 08:12:37 - 08:24:28 -278
Entiat 08:18:33 -51.5 Dark Down 60.7 80.6 Up 08:12:37 - 08:24:28 -302
Wenatchee 08:18:33 -51.8 Dark Down 60.6 80.1 Up 08:12:38 - 08:24:29 -330
Ellensburg 08:18:35 -52.2 Dark Down 60.3 79.2 Up 08:12:39 - 08:24:30 -376
Yakima 08:18:35 -52.6 Dark Down 60.3 78.5 Up 08:12:39 - 08:24:30 -421
Toppenish/White Swan 08:18:33 -52.8 Dark Down 60.3 78.2 Up 08:12:38 - 08:24:29 -445
Pasco 08:18:27 -52.7 Dark Down 61.1 78.6 Up 08:12:32 - 08:24:23 -459
PNWRO 08:18:26 -52.9 Dark Down 61.2 78.3 Up 08:12:30 - 08:24:21 -486
George/Umatilla 08:18:28 -53.1 Dark Down 60.9 77.9 Up 08:12:32 - 08:24:23 -496
Goldendale 08:18:35 -53.4 Dark Down 59.9 77.1 Up 08:12:40 - 08:24:31 -505
The Dalles 08:18:37 -53.7 Dark Down 59.6 76.6 Up 08:12:42 - 08:24:33 -530
Maupin 08:18:36 -54.1 Dark Down 59.6 75.9 Up 08:12:41 - 08:24:32 -576
Madras/Culver 08:18:36 -54.6 Dark Down 59.4 75.0 Up 08:12:41 - 08:24:32 -636
Sisters 08:18:39 -55.0 Dark Down 59.0 74.3 Up 08:12:43 - 08:24:34 -672
Redmond 08:18:36 -55.0 Dark Down 59.3 74.4 Up 08:12:41 - 08:24:32 -675
Bend 08:18:38 -55.2 Dark Down 59.1 74.0 Up 08:12:42 - 08:24:33 -699
Oregon Observatory 08:18:38 -55.4 Dark Down 59.0 73.7 Up 08:12:42 - 08:24:33 -717
La Pine/Gilchrist 08:18:38 -55.6 Dark Down 58.9 73.3 Up 08:12:43 - 08:24:34 -740
North Lake 08:18:35 -56.0 Dark Down 59.2 72.8 Up 08:12:40 - 08:24:31 -789
Paisley 08:18:32 -56.4 Dark Down 59.3 72.1 Up 08:12:37 - 08:24:28 -849
Chiloquin 08:18:39 -56.8 Dark Down 58.3 71.5 Up 08:12:43 - 08:24:34 -861
Klamath Falls 08:18:39 -57.1 Dark Down 58.3 71.0 Up 08:12:43 - 08:24:34 -898
Lakeview 08:18:31 -56.9 Dark Down 59.2 71.3 Up 08:12:36 - 08:24:27 -905
Tulelake 08:18:37 -57.3 Dark Down 58.4 70.6 Up 08:12:42 - 08:24:33 -928
Cedarville 08:18:30 -57.5 Dark Down 59.1 70.3 Up 08:12:34 - 08:24:25 -977
Niwot 08:17:02 -53.6 Dark Down 69.1 69.2 Up 08:11:07 - 08:22:58 -1020
Fall River/Burney 08:18:36 -58.2 Dark Down 58.1 69.3 Up 08:12:40 - 08:24:31 -1028
Susanville 08:18:32 -58.7 Dark Down 58.4 68.5 Up 08:12:36 - 08:24:27 -1097
Greenville 08:18:33 -59.0 Dark Down 58.1 68.0 Up 08:12:38 - 08:24:29 -1127
Gimple 08:18:32 -59.0 Dark Down 58.2 68.0 Up 08:12:37 - 08:24:28 -1127
Quincy 08:18:33 -59.2 Dark Down 58.0 67.7 Up 08:12:37 - 08:24:28 -1149
Portola 08:18:30 -59.2 Dark Down 58.3 67.6 Up 08:12:35 - 08:24:26 -1163
Reno 08:18:26 -59.3 Dark Down 58.7 67.3 Up 08:12:30 - 08:24:21 -1193
Carson City 08:18:26 -59.7 Dark Down 58.5 66.8 Up 08:12:30 - 08:24:21 -1231
Yerington 08:18:22 -59.7 Dark Down 58.9 66.5 Up 08:12:27 - 08:24:18 -1253
Gardnerville 08:18:25 -59.9 Dark Down 58.5 66.4 Up 08:12:30 - 08:24:21 -1258
Hawthorne 08:18:19 -60.0 Dark Down 59.1 65.9 Up 08:12:23 - 08:24:14 -1302
Tonopah 08:18:10 -60.1 Dark Down 59.9 65.3 Up 08:12:14 - 08:24:05 -1350
Lee Vining 08:18:21 -60.7 Dark Down 58.5 65.0 Up 08:12:25 - 08:24:16 -1363
Bishop 08:18:16 -61.0 Dark Down 58.8 64.2 Up 08:12:21 - 08:24:12 -1427
Beatty 08:18:06 -61.0 Dark Down 59.7 63.5 Up 08:12:10 - 08:24:01 -1473
Indian Springs 08:17:59 -60.9 Dark Down 60.3 62.9 Up 08:12:04 - 08:23:55 -1504
Lone Pine 08:18:13 -61.7 Dark Down 58.7 63.0 Up 08:12:18 - 08:24:09 -1508
Henderson 08:17:54 -61.2 Dark Down 60.5 62.1 Up 08:11:58 - 08:23:49 -1558
Patrick 08:17:46 -61.3 Dark Down 61.0 61.0 Up 08:11:51 - 08:23:42 -1618
Searchlight/Boulder City 08:17:53 -61.7 Dark Down 60.3 61.2 Up 08:11:57 - 08:23:48 -1618
Kingman/Dolan Springs 08:17:47 -61.6 Dark Down 60.8 60.6 Up 08:11:52 - 08:23:43 -1642
DCO 08:17:41 -61.3 Dark Down 61.4 60.4 Up 08:11:46 - 08:23:37 -1645
CPSLO 08:18:27 -63.6 Dark Down 56.2 61.3 Up 08:12:32 - 08:24:23 -1645
Laughlin/Bullhead City 08:17:50 -61.8 Dark Down 60.4 60.7 Up 08:11:55 - 08:23:46 -1648
Mohave Valley 08:17:50 -62.0 Dark Down 60.3 60.3 Up 08:11:55 - 08:23:46 -1676
Lake Havasu City 08:17:48 -62.3 Dark Down 60.2 59.6 Up 08:11:52 - 08:23:43 -1717
Parker 08:17:47 -62.6 Dark Down 60.1 59.1 Up 08:11:51 - 08:23:42 -1754
Wildwood 08:18:13 -64.2 Dark Down 57.1 59.6 Up 08:12:18 - 08:24:09 -1774
Idyllwild 08:18:01 -63.9 Dark Down 58.2 58.9 Up 08:12:06 - 08:23:57 -1808
Blythe 08:17:48 -63.1 Dark Down 59.6 58.4 Up 08:11:53 - 08:23:44 -1811
Calipatria 08:17:53 -63.9 Dark Down 58.7 57.8 Up 08:11:57 - 08:23:48 -1867
Yuma 08:17:47 -63.9 Dark Down 59.1 57.1 Up 08:11:51 - 08:23:42 -1908

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 08:15UT)
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 +44:18:49 15.7       141
Positions are for J2000

Event circumstances last updated at 2018/11/05 21:27:57 UT

Marc W. Buie, Southwest Research Institute

RECON