Event between (54598) Bienor and star UC4-639-010721 with event index number of 101221
Geocentric closest approach at 2018/02/01 06:42:47 UTC
J2000 position of star is 02:48:15.5 +37:44:11
Equinox of date position of star is 02:49:23.2 +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 72 seconds.
The 1-sigma cross-track error in the shadow position is
868 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 4.0 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 | 06:43:03 | -66.0 | Dark | Up | 26.6 | 298.3 | Low | 06:36:35 - 06:49:31 | 7397 |
| DCO | 06:44:19 | -67.3 | Dark | Up | 29.6 | 297.4 | Low | 06:37:51 - 06:50:47 | 7143 |
| Patrick | 06:44:17 | -66.7 | Dark | Up | 30.3 | 297.0 | Up | 06:37:49 - 06:50:45 | 7106 |
| Kingman/Dolan Springs | 06:44:21 | -66.8 | Dark | Up | 30.3 | 297.1 | Up | 06:37:53 - 06:50:49 | 7099 |
| Parker | 06:44:32 | -67.4 | Dark | Up | 30.0 | 297.6 | Low | 06:38:04 - 06:51:00 | 7095 |
| Lake Havasu City | 06:44:29 | -67.1 | Dark | Up | 30.2 | 297.4 | Up | 06:38:01 - 06:50:57 | 7092 |
| Yuma | 06:44:32 | -68.2 | Dark | Up | 29.5 | 298.2 | Low | 06:38:04 - 06:51:00 | 7088 |
| Blythe | 06:44:32 | -67.6 | Dark | Up | 29.9 | 297.7 | Low | 06:38:04 - 06:51:00 | 7084 |
| Mohave Valley | 06:44:25 | -66.7 | Dark | Up | 30.5 | 297.1 | Up | 06:37:57 - 06:50:53 | 7077 |
| Laughlin/Bullhead City | 06:44:22 | -66.5 | Dark | Up | 30.7 | 296.9 | Up | 06:37:54 - 06:50:50 | 7074 |
| Searchlight/Boulder City | 06:44:20 | -66.1 | Dark | Up | 31.1 | 296.6 | Up | 06:37:52 - 06:50:48 | 7055 |
| Henderson | 06:44:14 | -65.6 | Dark | Up | 31.4 | 296.3 | Up | 06:37:46 - 06:50:42 | 7047 |
| Calipatria | 06:44:32 | -67.4 | Dark | Up | 30.4 | 297.7 | Up | 06:38:04 - 06:51:00 | 7041 |
| Indian Springs | 06:44:11 | -64.8 | Dark | Up | 32.1 | 295.7 | Up | 06:37:43 - 06:50:39 | 7009 |
| Idyllwild | 06:44:32 | -66.2 | Dark | Up | 31.6 | 297.0 | Up | 06:38:04 - 06:51:00 | 6977 |
| Beatty | 06:44:11 | -64.0 | Dark | Up | 33.1 | 295.1 | Up | 06:37:43 - 06:50:39 | 6952 |
| Tonopah | 06:44:00 | -62.9 | Dark | Up | 33.9 | 294.2 | Up | 06:37:32 - 06:50:28 | 6918 |
| Lone Pine | 06:44:17 | -63.5 | Dark | Up | 33.9 | 294.8 | Up | 06:37:49 - 06:50:45 | 6889 |
| Wildwood | 06:44:32 | -64.8 | Dark | Up | 33.1 | 296.2 | Up | 06:38:04 - 06:51:00 | 6877 |
| Bishop | 06:44:11 | -62.7 | Dark | Up | 34.4 | 294.2 | Up | 06:37:43 - 06:50:39 | 6865 |
| Hawthorne | 06:44:00 | -61.8 | Dark | Up | 35.1 | 293.4 | Up | 06:37:32 - 06:50:28 | 6842 |
| Lee Vining | 06:44:07 | -61.9 | Dark | Up | 35.2 | 293.5 | Up | 06:37:39 - 06:50:35 | 6822 |
| Yerington | 06:43:56 | -61.2 | Dark | Up | 35.7 | 292.8 | Up | 06:37:28 - 06:50:24 | 6810 |
| Gardnerville | 06:43:58 | -60.9 | Dark | Up | 36.1 | 292.6 | Up | 06:37:30 - 06:50:26 | 6780 |
| Carson City | 06:43:55 | -60.7 | Dark | Up | 36.2 | 292.4 | Up | 06:37:27 - 06:50:23 | 6775 |
| Reno | 06:43:52 | -60.4 | Dark | Up | 36.4 | 292.2 | Up | 06:37:24 - 06:50:20 | 6770 |
| CPSLO | 06:44:32 | -62.7 | Dark | Up | 35.2 | 294.7 | Up | 06:38:04 - 06:51:00 | 6759 |
| Portola | 06:43:51 | -59.8 | Dark | Up | 36.9 | 291.7 | Up | 06:37:23 - 06:50:19 | 6733 |
| Cedarville | 06:43:32 | -58.8 | Dark | Up | 37.4 | 290.6 | Up | 06:37:04 - 06:50:00 | 6727 |
| Susanville | 06:43:44 | -59.3 | Dark | Up | 37.3 | 291.2 | Up | 06:37:16 - 06:50:12 | 6717 |
| Gimple | 06:43:48 | -59.4 | Dark | Up | 37.4 | 291.3 | Up | 06:37:20 - 06:50:16 | 6709 |
| PNWRO | 06:42:44 | -56.0 | Dark | Up | 38.2 | 287.9 | Up | 06:36:16 - 06:49:12 | 6709 |
| Lakeview | 06:43:26 | -58.2 | Dark | Up | 37.8 | 290.0 | Up | 06:36:58 - 06:49:54 | 6709 |
| Quincy | 06:43:50 | -59.5 | Dark | Up | 37.3 | 291.4 | Up | 06:37:22 - 06:50:18 | 6707 |
| Greenville | 06:43:49 | -59.3 | Dark | Up | 37.4 | 291.3 | Up | 06:37:21 - 06:50:17 | 6705 |
| Pasco | 06:42:41 | -55.7 | Dark | Up | 38.4 | 287.6 | Up | 06:36:13 - 06:49:09 | 6693 |
| Paisley | 06:43:22 | -57.7 | Dark | Up | 38.1 | 289.6 | Up | 06:36:54 - 06:49:50 | 6691 |
| George/Umatilla | 06:42:45 | -55.8 | Dark | Up | 38.4 | 287.7 | Up | 06:36:17 - 06:49:13 | 6690 |
| Fall River/Burney | 06:43:40 | -58.5 | Dark | Up | 38.1 | 290.4 | Up | 06:37:12 - 06:50:08 | 6671 |
| North Lake | 06:43:16 | -57.1 | Dark | Up | 38.5 | 289.0 | Up | 06:36:48 - 06:49:44 | 6665 |
| Tulelake | 06:43:31 | -57.8 | Dark | Up | 38.5 | 289.7 | Up | 06:37:03 - 06:49:59 | 6655 |
| Klamath Falls | 06:43:29 | -57.4 | Dark | Up | 38.8 | 289.3 | Up | 06:37:01 - 06:49:57 | 6636 |
| Redmond | 06:43:07 | -56.3 | Dark | Up | 39.1 | 288.0 | Up | 06:36:39 - 06:49:35 | 6634 |
| Toppenish/White Swan | 06:42:43 | -55.0 | Dark | Up | 39.3 | 286.8 | Up | 06:36:15 - 06:49:11 | 6632 |
| Bend | 06:43:08 | -56.3 | Dark | Up | 39.1 | 288.1 | Up | 06:36:40 - 06:49:36 | 6631 |
| Madras/Culver | 06:43:02 | -56.0 | Dark | Up | 39.2 | 287.8 | Up | 06:36:34 - 06:49:30 | 6630 |
| La Pine/Gilchrist | 06:43:13 | -56.5 | Dark | Up | 39.1 | 288.3 | Up | 06:36:45 - 06:49:41 | 6628 |
| Oregon Observatory | 06:43:10 | -56.4 | Dark | Up | 39.1 | 288.2 | Up | 06:36:42 - 06:49:38 | 6627 |
| Chiloquin | 06:43:25 | -57.1 | Dark | Up | 39.0 | 289.0 | Up | 06:36:57 - 06:49:53 | 6627 |
| Okanogan | 06:42:21 | -53.8 | Dark | Up | 39.3 | 285.6 | Up | 06:35:53 - 06:48:49 | 6623 |
| Goldendale | 06:42:50 | -55.3 | Dark | Up | 39.4 | 287.0 | Up | 06:36:22 - 06:49:18 | 6623 |
| Maupin | 06:42:56 | -55.6 | Dark | Up | 39.3 | 287.3 | Up | 06:36:28 - 06:49:24 | 6623 |
| Tonasket | 06:42:17 | -53.6 | Dark | Up | 39.3 | 285.4 | Up | 06:35:49 - 06:48:45 | 6622 |
| Brewster | 06:42:25 | -53.9 | Dark | Up | 39.4 | 285.7 | Up | 06:35:57 - 06:48:53 | 6621 |
| Yakima | 06:42:41 | -54.8 | Dark | Up | 39.4 | 286.5 | Up | 06:36:13 - 06:49:09 | 6619 |
| Oroville | 06:42:15 | -53.4 | Dark | Up | 39.4 | 285.2 | Up | 06:35:47 - 06:48:43 | 6616 |
| Sisters | 06:43:06 | -56.0 | Dark | Up | 39.4 | 287.8 | Up | 06:36:38 - 06:49:34 | 6614 |
| Wenatchee | 06:42:33 | -54.2 | Dark | Up | 39.5 | 285.9 | Up | 06:36:05 - 06:49:01 | 6612 |
| Ellensburg | 06:42:37 | -54.5 | Dark | Up | 39.5 | 286.2 | Up | 06:36:09 - 06:49:05 | 6611 |
| Entiat | 06:42:30 | -54.1 | Dark | Up | 39.5 | 285.8 | Up | 06:36:02 - 06:48:58 | 6611 |
| The Dalles | 06:42:53 | -55.3 | Dark | Up | 39.5 | 286.9 | Up | 06:36:25 - 06:49:21 | 6609 |
| Manson/Chelan | 06:42:27 | -53.9 | Dark | Up | 39.6 | 285.7 | Up | 06:35:59 - 06:48:55 | 6609 |
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 2017/12/15 17:12:28 UT
Marc W. Buie, Southwest Research Institute