RECON: TNO occultation with 160427

Event between (160427) 05RL43 and star GA1000:00897413 with event index number of 1967422

Geocentric closest approach at 2028/02/03 06:00:42 UTC

J2000 position of star is 05:38:01.1 +11:05:37
Equinox of date position of star is 05:39:21.1 +11:06:22
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 50 degrees from the moon. Moon is 45% illuminated.
Apparent brightness V=22.0

[RECON map]
Object is 24.9 AU from the Sun and 24.2 AU from the Earth.
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 90 seconds.
The 1-sigma cross-track error in the shadow position is 931 km.
The sky-plane scale is 17581.0 km/arcsec.

The object has an absolute magnitude Hv=7.9
Diameter=155.6 km assuming a 5% albedo -- 10.4 sec chord
Diameter=63.5 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 160427, (2028/02/03 06:00UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:41.6 +07:24:36  0.4  5.61  55
Bellatrix      05:26:38.4 +06:22:22  1.6  5.71  48
PPM 121138     05:36:46.3 +10:15:23  5.7  1.10  49
PPM 121185     05:38:38.2 +11:03:00  7.5  0.24  50
160427         05:39:34.8 +11:06:29 16.6        50
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 19.8 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)
Sleaford 05:59:53 -51.4 Dark Up 41.3 224.6 Up 05:51:55 - 06:07:51 5323
Kamloops 06:00:44 -46.7 Dark Up 47.7 207.2 Up 05:52:46 - 06:08:42 4877
Kelowna 06:00:37 -47.6 Dark Up 48.1 208.8 Up 05:52:39 - 06:08:35 4839
Peachland 06:00:38 -47.5 Dark Up 48.3 208.5 Up 05:52:40 - 06:08:36 4824
Summerland 06:00:37 -47.7 Dark Up 48.4 208.7 Up 05:52:39 - 06:08:35 4815
Penticton 06:00:37 -47.8 Dark Up 48.4 208.9 Up 05:52:39 - 06:08:35 4813
Oliver 06:00:36 -48.0 Dark Up 48.8 209.1 Up 05:52:38 - 06:08:34 4786
Anarchist Mountain Observatory 06:00:34 -48.2 Dark Up 48.9 209.4 Up 05:52:36 - 06:08:32 4779
Okanogan 06:00:32 -48.5 Dark Up 49.5 209.5 Up 05:52:34 - 06:08:30 4724
Brewster 06:00:33 -48.5 Dark Up 49.8 209.3 Up 05:52:35 - 06:08:31 4698
Manson/Chelan 06:00:34 -48.5 Dark Up 50.1 208.9 Up 05:52:36 - 06:08:32 4673
Victoria 06:01:08 -46.4 Dark Up 50.4 204.0 Up 05:53:10 - 06:09:06 4648
Wenatchee 06:00:33 -48.7 Dark Up 50.6 209.0 Up 05:52:35 - 06:08:31 4632
Ellensburg 06:00:33 -48.8 Dark Up 51.0 208.9 Up 05:52:35 - 06:08:31 4594
Yakima 06:00:31 -49.0 Dark Up 51.4 209.1 Up 05:52:33 - 06:08:29 4562
PNWRO 06:00:21 -50.3 Dark Up 51.3 211.8 Up 05:52:23 - 06:08:19 4560
Toppenish/White Swan 06:00:30 -49.2 Dark Up 51.5 209.5 Up 05:52:32 - 06:08:28 4550
Dunrhomin 05:58:58 -61.3 Dark Up 48.8 234.3 Up 05:51:00 - 06:06:56 4496
Nikitin 05:58:58 -61.4 Dark Up 48.9 234.4 Up 05:51:00 - 06:06:56 4480
CU-SBO 05:58:57 -61.4 Dark Up 49.0 234.4 Up 05:50:59 - 06:06:55 4473
The Dalles 06:00:31 -49.2 Dark Up 52.4 208.8 Up 05:52:33 - 06:08:29 4467
Maupin 06:00:29 -49.5 Dark Up 52.8 209.2 Up 05:52:31 - 06:08:27 4436
Sisters 06:00:29 -49.7 Dark Up 53.7 209.0 Up 05:52:31 - 06:08:27 4352
Bend 06:00:27 -50.0 Dark Up 53.8 209.5 Up 05:52:29 - 06:08:25 4340
Oregon Observatory 06:00:27 -50.0 Dark Up 54.0 209.5 Up 05:52:29 - 06:08:25 4322
Chiloquin 06:00:24 -50.4 Dark Up 55.3 209.7 Up 05:52:26 - 06:08:22 4202
Klamath Falls 06:00:23 -50.6 Dark Up 55.6 210.1 Up 05:52:25 - 06:08:21 4175
Cedarville 06:00:12 -52.0 Dark Up 55.6 213.1 Up 05:52:14 - 06:08:10 4162
Fall River/Burney 06:00:17 -51.4 Dark Up 56.5 211.5 Up 05:52:19 - 06:08:15 4086
Gimple 06:00:12 -52.2 Dark Up 57.0 213.1 Up 05:52:14 - 06:08:10 4024
Greenville 06:00:12 -52.1 Dark Up 57.1 213.0 Up 05:52:14 - 06:08:10 4021
Portola 06:00:09 -52.6 Dark Up 57.1 214.0 Up 05:52:11 - 06:08:07 4007
Quincy 06:00:10 -52.2 Dark Up 57.2 213.1 Up 05:52:12 - 06:08:08 4004
Reno 06:00:05 -53.2 Dark Up 57.1 215.3 Up 05:52:07 - 06:08:03 4003
Yerington 05:59:59 -53.9 Dark Up 57.2 216.8 Up 05:52:01 - 06:07:57 3975
Carson City 06:00:03 -53.4 Dark Up 57.4 215.6 Up 05:52:05 - 06:08:01 3973
Gardnerville 06:00:02 -53.5 Dark Up 57.5 215.9 Up 05:52:04 - 06:08:00 3953
Hawthorne 05:59:55 -54.4 Dark Up 57.4 218.1 Up 05:51:57 - 06:07:53 3950
Lee Vining 05:59:56 -54.4 Dark Up 58.1 217.8 Up 05:51:58 - 06:07:54 3887
Beatty 05:59:40 -56.5 Dark Up 57.7 222.5 Up 05:51:42 - 06:07:38 3865
Bishop 05:59:50 -55.1 Dark Up 58.2 219.6 Up 05:51:52 - 06:07:48 3856
Patrick 05:59:20 -59.2 Dark Up 57.1 228.3 Up 05:51:22 - 06:07:18 3824
Laughlin/Bullhead City 05:59:23 -58.8 Dark Up 57.7 227.6 Up 05:51:25 - 06:07:21 3780
George/Scottsdale 05:59:04 -61.4 Dark Up 56.9 233.0 Up 05:51:06 - 06:07:02 3738
Lake Havasu City 05:59:19 -59.3 Dark Up 58.0 228.8 Up 05:51:21 - 06:07:17 3729
Idyllwild 05:59:29 -57.9 Dark Up 59.9 226.2 Up 05:51:31 - 06:07:27 3585
Calipatria 05:59:20 -59.0 Dark Up 59.7 228.7 Up 05:51:22 - 06:07:18 3567
Wildwood 05:59:40 -56.4 Dark Up 60.8 222.8 Up 05:51:42 - 06:07:38 3558
Yuma 05:59:14 -59.9 Dark Up 59.4 230.6 Up 05:51:16 - 06:07:12 3557

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 160427, (2028/02/03 06:00UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  5.61  55
Bellatrix      05:25:07.8 +06:20:58  1.6  5.71  48
PPM 121138     05:35:13.2 +10:14:24  5.7  1.10  49
PPM 121185     05:37:04.5 +11:02:06  7.5  0.24  50
160427         05:38:01.1 +11:05:37 16.6        50
Positions are for J2000

Event circumstances last updated at 2023/12/24 04:37:19 UT

Marc W. Buie, Southwest Research Institute

RECON