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 06:43:27 UTC

J2000 position of star is 02:48:15.5 +37:44:11
Equinox of date position of star is 02:49:21.3 +37:48:30
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 80 seconds.
The 1-sigma cross-track error in the shadow position is 1049 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 3.7 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 06:43:41 -66.1 Dark Up 26.5 298.3 Low 06:36:32 - 06:50:51 8251
DCO 06:44:32 -67.4 Dark Up 29.6 297.5 Low 06:37:23 - 06:51:42 8005
Patrick 06:44:32 -66.7 Dark Up 30.2 297.1 Up 06:37:23 - 06:51:42 7969
Parker 06:44:32 -67.4 Dark Up 30.0 297.6 Low 06:37:23 - 06:51:42 7963
Kingman/Dolan Springs 06:44:32 -66.8 Dark Up 30.3 297.1 Up 06:37:23 - 06:51:42 7962
Lake Havasu City 06:44:32 -67.2 Dark Up 30.2 297.4 Up 06:37:23 - 06:51:42 7957
Blythe 06:44:32 -67.6 Dark Up 29.9 297.7 Low 06:37:23 - 06:51:42 7954
Yuma 06:45:24 -68.3 Dark Up 29.4 298.2 Low 06:38:14 - 06:52:33 7945
Mohave Valley 06:44:32 -66.7 Dark Up 30.5 297.1 Up 06:37:23 - 06:51:42 7941
Laughlin/Bullhead City 06:44:32 -66.5 Dark Up 30.6 296.9 Up 06:37:23 - 06:51:42 7938
Searchlight/Boulder City 06:44:32 -66.1 Dark Up 31.0 296.6 Up 06:37:23 - 06:51:42 7919
Calipatria 06:44:32 -67.4 Dark Up 30.4 297.7 Up 06:37:23 - 06:51:42 7915
Henderson 06:44:32 -65.7 Dark Up 31.3 296.3 Up 06:37:23 - 06:51:42 7909
Indian Springs 06:44:32 -64.9 Dark Up 32.1 295.7 Up 06:37:23 - 06:51:42 7870
Idyllwild 06:44:32 -66.2 Dark Up 31.6 297.0 Up 06:37:23 - 06:51:42 7852
Beatty 06:44:32 -64.1 Dark Up 33.0 295.2 Up 06:37:23 - 06:51:42 7814
Tonopah 06:44:32 -63.0 Dark Up 33.8 294.3 Up 06:37:23 - 06:51:42 7779
Lone Pine 06:44:32 -63.5 Dark Up 33.8 294.8 Up 06:37:23 - 06:51:42 7753
Wildwood 06:44:32 -64.8 Dark Up 33.1 296.2 Up 06:37:23 - 06:51:42 7753
Bishop 06:44:32 -62.8 Dark Up 34.4 294.2 Up 06:37:23 - 06:51:42 7728
Hawthorne 06:44:32 -61.9 Dark Up 35.0 293.4 Up 06:37:23 - 06:51:42 7703
Lee Vining 06:44:32 -62.0 Dark Up 35.1 293.6 Up 06:37:23 - 06:51:42 7685
Yerington 06:44:32 -61.2 Dark Up 35.6 292.9 Up 06:37:23 - 06:51:42 7671
Gardnerville 06:44:32 -60.9 Dark Up 36.0 292.7 Up 06:37:23 - 06:51:42 7641
Carson City 06:44:32 -60.7 Dark Up 36.1 292.5 Up 06:37:23 - 06:51:42 7636
CPSLO 06:44:32 -62.7 Dark Up 35.2 294.7 Up 06:37:23 - 06:51:42 7632
Reno 06:44:29 -60.5 Dark Up 36.3 292.2 Up 06:37:20 - 06:51:39 7631
Portola 06:44:28 -59.9 Dark Up 36.8 291.8 Up 06:37:18 - 06:51:37 7595
Cedarville 06:44:10 -58.9 Dark Up 37.3 290.7 Up 06:37:00 - 06:51:19 7587
Susanville 06:44:22 -59.4 Dark Up 37.2 291.3 Up 06:37:13 - 06:51:32 7578
Gimple 06:44:26 -59.5 Dark Up 37.2 291.4 Up 06:37:16 - 06:51:35 7570
Lakeview 06:44:04 -58.3 Dark Up 37.7 290.1 Up 06:36:54 - 06:51:13 7569
Quincy 06:44:28 -59.6 Dark Up 37.2 291.5 Up 06:37:18 - 06:51:37 7568
PNWRO 06:43:22 -56.0 Dark Up 38.0 288.0 Up 06:36:12 - 06:50:31 7566
Greenville 06:44:26 -59.4 Dark Up 37.3 291.3 Up 06:37:16 - 06:51:35 7566
Paisley 06:43:59 -57.8 Dark Up 38.0 289.6 Up 06:36:50 - 06:51:09 7551
Pasco 06:43:20 -55.7 Dark Up 38.3 287.6 Up 06:36:10 - 06:50:29 7550
George/Umatilla 06:43:23 -55.9 Dark Up 38.3 287.8 Up 06:36:13 - 06:50:32 7548
Fall River/Burney 06:44:18 -58.5 Dark Up 38.0 290.5 Up 06:37:08 - 06:51:27 7531
North Lake 06:43:54 -57.2 Dark Up 38.4 289.0 Up 06:36:44 - 06:51:03 7525
Tulelake 06:44:08 -57.9 Dark Up 38.4 289.8 Up 06:36:58 - 06:51:17 7515
Klamath Falls 06:44:07 -57.5 Dark Up 38.7 289.4 Up 06:36:57 - 06:51:16 7496
Redmond 06:43:43 -56.3 Dark Up 39.0 288.1 Up 06:36:34 - 06:50:53 7494
Bend 06:43:46 -56.4 Dark Up 39.0 288.2 Up 06:36:37 - 06:50:56 7491
Madras/Culver 06:43:41 -56.1 Dark Up 39.1 287.8 Up 06:36:31 - 06:50:50 7490
Toppenish/White Swan 06:43:21 -55.1 Dark Up 39.2 286.8 Up 06:36:11 - 06:50:30 7490
La Pine/Gilchrist 06:43:51 -56.6 Dark Up 39.0 288.4 Up 06:36:42 - 06:51:01 7488
Oregon Observatory 06:43:49 -56.5 Dark Up 39.0 288.3 Up 06:36:40 - 06:50:59 7487
Chiloquin 06:44:03 -57.2 Dark Up 38.9 289.1 Up 06:36:54 - 06:51:13 7487
Maupin 06:43:34 -55.7 Dark Up 39.2 287.4 Up 06:36:25 - 06:50:44 7481
Goldendale 06:43:27 -55.3 Dark Up 39.3 287.0 Up 06:36:17 - 06:50:36 7481
Okanogan 06:42:59 -53.9 Dark Up 39.2 285.7 Up 06:35:49 - 06:50:08 7480
Tonasket 06:42:54 -53.6 Dark Up 39.2 285.5 Up 06:35:45 - 06:50:04 7479
Brewster 06:43:02 -54.0 Dark Up 39.3 285.8 Up 06:35:53 - 06:50:12 7478
Yakima 06:43:19 -54.9 Dark Up 39.3 286.6 Up 06:36:09 - 06:50:28 7477
Sisters 06:43:45 -56.1 Dark Up 39.3 287.9 Up 06:36:35 - 06:50:54 7474
Oroville 06:42:53 -53.5 Dark Up 39.3 285.3 Up 06:35:43 - 06:50:02 7472
Wenatchee 06:43:10 -54.3 Dark Up 39.4 286.0 Up 06:36:00 - 06:50:19 7470
Ellensburg 06:43:15 -54.5 Dark Up 39.4 286.3 Up 06:36:05 - 06:50:24 7469
Entiat 06:43:08 -54.2 Dark Up 39.4 285.9 Up 06:35:58 - 06:50:17 7468
The Dalles 06:43:30 -55.3 Dark Up 39.4 287.0 Up 06:36:21 - 06:50:40 7468
Manson/Chelan 06:43:05 -54.0 Dark Up 39.5 285.8 Up 06:35:55 - 06:50:14 7467

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 2017/06/14 17:00:01 UT

Marc W. Buie, Southwest Research Institute

RECON