Event between (52975) Cyllarus and star UC4-616-041487 with event index number of 106230
Geocentric closest approach at 2018/02/27 03:06:56 UTC
J2000 position of star is 07:36:17.6 +33:00:44
Equinox of date position of star is 07:37:27.6 +32:58:16
Stellar brightness R=15.7,
use SENSEUP=128
Star is 15 degrees from the moon.
Moon is 89% illuminated.
TNO apparent brightness V=23.9
[RECON map]
TNO is 27.5 AU from the Sun
and 26.9 AU from the Earth.
The TNO is moving 15.8
km/sec on the sky relative to the star, or,
2.9 arcsec/hr.
The 1-sigma error in the time of the event is 1731 seconds.
The 1-sigma cross-track error in the shadow position is
1763 km.
The sky-plane scale is
19500.1 km/arcsec.
The TNO has an absolute magnitude Hv=9.4
Diameter=79.4 km assuming a 5% albedo -- 5.0 sec chord
Diameter=32.4 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
Star training set for 52975, (2018/02/27 03:07UT) Object RA Dec mag sep mel Pollux 07:46:25.5 +27:58:51 1.1 5.35 10 PPM 073009 07:41:03.6 +31:58:00 6.4 1.26 14 PPM 072932 07:35:35.1 +33:04:53 8.1 0.41 16 PPM 072966 07:37:46.2 +33:09:40 11.1 0.20 15 52975 07:37:27.8 +32:58:15 15.7 15 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
0.5 sigma about the mid-time.
The median site spacing is 26.5 km
RECON observability=0.9 and success probability=28.1%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 03:08:59 | -15.9 | AT | Up | 63.0 | 115.2 | Up | 02:53:59 - 03:23:59 | 759 |
| Tonasket | 03:09:00 | -15.9 | AT | Up | 63.1 | 114.8 | Up | 02:54:00 - 03:24:00 | 736 |
| Okanogan | 03:09:02 | -15.9 | AT | Up | 63.1 | 114.0 | Up | 02:54:02 - 03:24:02 | 707 |
| Brewster | 03:09:03 | -15.8 | AT | Up | 63.1 | 113.2 | Up | 02:54:03 - 03:24:03 | 685 |
| Manson/Chelan | 03:09:05 | -15.5 | AT | Up | 63.0 | 112.4 | Up | 02:54:05 - 03:24:05 | 673 |
| Entiat | 03:09:06 | -15.5 | AT | Up | 63.0 | 111.9 | Up | 02:54:06 - 03:24:06 | 654 |
| Wenatchee | 03:09:07 | -15.5 | AT | Up | 63.1 | 111.3 | Up | 02:54:07 - 03:24:07 | 631 |
| Ellensburg | 03:09:10 | -15.4 | AT | Up | 63.1 | 110.3 | Up | 02:54:10 - 03:24:10 | 596 |
| Yakima | 03:09:11 | -15.4 | AT | Up | 63.2 | 109.6 | Up | 02:54:11 - 03:24:11 | 556 |
| Toppenish/White Swan | 03:09:11 | -15.5 | AT | Up | 63.4 | 109.3 | Up | 02:54:11 - 03:24:11 | 530 |
| Goldendale | 03:09:14 | -15.3 | AT | Up | 63.3 | 107.8 | Up | 02:54:14 - 03:24:14 | 486 |
| Pasco | 03:09:06 | -16.4 | AT | Up | 64.2 | 110.6 | Up | 02:54:06 - 03:24:06 | 486 |
| The Dalles | 03:09:16 | -15.0 | AT | Up | 63.1 | 107.0 | Up | 02:54:16 - 03:24:16 | 473 |
| George/Umatilla | 03:09:08 | -16.3 | AT | Up | 64.2 | 109.7 | Up | 02:54:08 - 03:24:08 | 458 |
| PNWRO | 03:09:06 | -16.6 | AT | Up | 64.5 | 110.4 | Up | 02:54:06 - 03:24:06 | 456 |
| Maupin | 03:09:17 | -15.1 | AT | Up | 63.3 | 106.3 | Up | 02:54:17 - 03:24:17 | 429 |
| Madras/Culver | 03:09:19 | -15.1 | AT | Up | 63.4 | 105.2 | Up | 02:54:19 - 03:24:19 | 375 |
| Sisters | 03:09:22 | -14.8 | AT | Up | 63.2 | 104.1 | Up | 02:54:22 - 03:24:22 | 354 |
| Redmond | 03:09:20 | -15.1 | AT | Up | 63.5 | 104.5 | Up | 02:54:20 - 03:24:20 | 341 |
| Bend | 03:09:21 | -15.0 | AT | Up | 63.5 | 103.9 | Up | 02:54:21 - 03:24:21 | 323 |
| Oregon Observatory | 03:09:22 | -15.0 | AT | Up | 63.4 | 103.5 | Up | 02:54:22 - 03:24:22 | 309 |
| La Pine/Gilchrist | 03:09:23 | -14.9 | AT | Up | 63.4 | 103.0 | Up | 02:54:23 - 03:24:23 | 290 |
| North Lake | 03:09:22 | -15.4 | AT | Up | 63.9 | 102.8 | Up | 02:54:22 - 03:24:22 | 230 |
| Chiloquin | 03:09:28 | -14.7 | AT | Up | 63.4 | 100.5 | Up | 02:54:28 - 03:24:28 | 189 |
| Paisley | 03:09:22 | -15.7 | AT | Up | 64.3 | 102.0 | Up | 02:54:22 - 03:24:22 | 165 |
| Klamath Falls | 03:09:28 | -14.8 | AT | Up | 63.5 | 99.9 | Up | 02:54:28 - 03:24:28 | 152 |
| Tulelake | 03:09:28 | -15.0 | AT | Up | 63.8 | 99.6 | Up | 02:54:28 - 03:24:28 | 116 |
| Lakeview | 03:09:22 | -15.8 | AT | Up | 64.6 | 101.2 | Up | 02:54:22 - 03:24:22 | 108 |
| Cedarville | 03:09:24 | -16.0 | AT | Up | 64.8 | 100.0 | Up | 02:54:24 - 03:24:24 | 37 |
| Fall River/Burney | 03:09:30 | -15.1 | AT | Up | 64.0 | 97.9 | Up | 02:54:30 - 03:24:30 | 22 |
| Susanville | 03:09:28 | -15.7 | AT | Up | 64.6 | 97.2 | Up | 02:54:28 - 03:24:28 | -64 |
| Greenville | 03:09:31 | -15.5 | AT | Up | 64.5 | 96.4 | Up | 02:54:31 - 03:24:31 | -83 |
| Gimple | 03:09:30 | -15.6 | AT | Up | 64.5 | 96.5 | Up | 02:54:30 - 03:24:30 | -86 |
| Quincy | 03:09:31 | -15.5 | AT | Up | 64.5 | 96.0 | Up | 02:54:31 - 03:24:31 | -104 |
| Portola | 03:09:29 | -15.9 | AT | Up | 64.9 | 96.1 | Up | 02:54:29 - 03:24:29 | -131 |
| Reno | 03:09:27 | -16.4 | AT | Up | 65.4 | 96.1 | Up | 02:54:27 - 03:24:27 | -176 |
| Carson City | 03:09:28 | -16.4 | AT | Up | 65.4 | 95.3 | Up | 02:54:28 - 03:24:28 | -214 |
| Gardnerville | 03:09:28 | -16.5 | AT | Up | 65.5 | 94.8 | Up | 02:54:28 - 03:24:28 | -240 |
| Yerington | 03:09:25 | -16.9 | AT | Up | 65.9 | 95.4 | Up | 02:54:25 - 03:24:25 | -252 |
| Hawthorne | 03:09:24 | -17.3 | AT | Up | 66.4 | 94.7 | Up | 02:54:24 - 03:24:24 | -314 |
| Lee Vining | 03:09:28 | -17.0 | AT | Up | 66.0 | 93.1 | Up | 02:54:28 - 03:24:28 | -359 |
| Tonopah | 03:09:19 | -18.5 | Dark | Up | 67.5 | 94.7 | Up | 02:54:19 - 03:24:19 | -401 |
| Bishop | 03:09:26 | -17.6 | AT | Up | 66.6 | 92.2 | Up | 02:54:26 - 03:24:26 | -441 |
| Niwot | 03:08:15 | -27.2 | Dark | Up | 75.9 | 115.3 | Up | 02:53:15 - 03:23:15 | -453 |
| Lone Pine | 03:09:26 | -17.9 | AT | Up | 66.9 | 90.7 | Up | 02:54:26 - 03:24:26 | -530 |
| Beatty | 03:09:19 | -18.9 | Dark | Up | 67.9 | 92.2 | Up | 02:54:19 - 03:24:19 | -534 |
| CPSLO | 03:09:42 | -15.9 | AT | Up | 64.8 | 86.4 | Up | 02:54:42 - 03:24:42 | -590 |
| Indian Springs | 03:09:15 | -19.8 | Dark | Up | 68.8 | 92.1 | Up | 02:54:15 - 03:24:15 | -597 |
| Henderson | 03:09:13 | -20.4 | Dark | Up | 69.4 | 91.2 | Up | 02:54:13 - 03:24:13 | -672 |
| Searchlight/Boulder City | 03:09:13 | -20.5 | Dark | Up | 69.4 | 89.7 | Up | 02:54:13 - 03:24:13 | -734 |
| Patrick | 03:09:08 | -21.3 | Dark | Up | 70.3 | 90.1 | Up | 02:54:08 - 03:24:08 | -767 |
| Laughlin/Bullhead City | 03:09:12 | -20.8 | Dark | Up | 69.7 | 89.1 | Up | 02:54:12 - 03:24:12 | -774 |
| Wildwood | 03:09:35 | -17.6 | AT | Up | 66.4 | 84.6 | Up | 02:54:35 - 03:24:35 | -777 |
| Kingman/Dolan Springs | 03:09:10 | -21.2 | Dark | Up | 70.1 | 89.4 | Up | 02:54:10 - 03:24:10 | -786 |
| Mohave Valley | 03:09:13 | -20.8 | Dark | Up | 69.7 | 88.3 | Up | 02:54:13 - 03:24:13 | -804 |
| DCO | 03:09:05 | -21.9 | Dark | Up | 70.8 | 89.7 | Up | 02:54:05 - 03:24:05 | -817 |
| Lake Havasu City | 03:09:12 | -21.0 | Dark | Up | 69.9 | 87.4 | Up | 02:54:12 - 03:24:12 | -852 |
| Idyllwild | 03:09:26 | -19.1 | Dark | Up | 67.9 | 84.4 | Up | 02:54:26 - 03:24:26 | -868 |
| Parker | 03:09:13 | -21.1 | Dark | Up | 69.9 | 86.4 | Up | 02:54:13 - 03:24:13 | -890 |
| Blythe | 03:09:15 | -20.9 | Dark | Up | 69.6 | 84.9 | Up | 02:54:15 - 03:24:15 | -938 |
| Calipatria | 03:09:21 | -20.1 | Dark | Up | 68.8 | 83.3 | Up | 02:54:21 - 03:24:21 | -965 |
| Yuma | 03:09:17 | -20.9 | Dark | Up | 69.5 | 82.4 | Up | 02:54:17 - 03:24:17 | -1035 |
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 52975, (2018/02/27 03:07UT) Object RA Dec mag sep mel Pollux 07:45:18.1 +28:01:33 1.1 5.35 10 PPM 073009 07:39:54.0 +32:00:34 6.4 1.26 14 PPM 072932 07:34:24.7 +33:07:19 8.1 0.41 16 PPM 072966 07:36:35.9 +33:12:10 11.1 0.20 15 52975 07:36:17.6 +33:00:44 15.7 15 Positions are for J2000
Event circumstances last updated at 2018/02/02 17:01:59 UT
Marc W. Buie, Southwest Research Institute