RECON: TNO occultation with 160427

Event between (160427) 05RL43 and star GA0980:00479050 with event index number of 1967021

Geocentric closest approach at 2021/10/12 10:21:53 UTC

J2000 position of star is 04:37:47.3 +09:25:37
Equinox of date position of star is 04:38:58.8 +09:28:10
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 146 degrees from the moon. Moon is 42% illuminated.
TNO apparent brightness V=21.9

[RECON map]
TNO is 24.5 AU from the Sun and 23.9 AU from the Earth.
The TNO is moving 14.4 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 71 seconds.
The 1-sigma cross-track error in the shadow position is 890 km.
The sky-plane scale is 17343.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=154.9 km assuming a 5% albedo -- 10.8 sec chord
Diameter=63.2 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 160427, (2021/10/12 10:22UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.4 +16:33:05  0.8  7.10 149
Bellatrix      05:26:18.0 +06:22:03  1.6 12.12 153
88 Tau         04:36:51.1 +10:12:15  4.5  0.90 146
PPM 147779     04:40:11.6 +09:40:51  8.1  0.37 146
PPM 147735     04:38:18.6 +09:26:26  9.1  0.17 145
160427         04:38:58.8 +09:28:10 15.3       146
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 20.9 km RECON observability=1.0 and success probability=41.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 10:20:54 -39.4 Dark Down 48.5 155.1 Up 10:14:32 - 10:27:17 65
Clarence Fulton 10:20:30 -36.3 Dark Down 47.9 161.6 Up 10:14:08 - 10:26:53 33
Peachland 10:20:34 -36.9 Dark Down 48.3 160.7 Up 10:14:12 - 10:26:57 16
Kelowna 10:20:33 -36.6 Dark Down 48.2 161.2 Up 10:14:10 - 10:26:55 12
Summerland 10:20:34 -36.9 Dark Down 48.4 160.8 Up 10:14:12 - 10:26:57 2
Penticton 10:20:34 -36.9 Dark Down 48.5 161.0 Up 10:14:12 - 10:26:57 -6
Oliver 10:20:36 -37.1 Dark Down 48.9 160.8 Up 10:14:13 - 10:26:58 -29
Anarchist Mountain Observatory 10:20:35 -37.1 Dark Down 49.1 161.1 Up 10:14:13 - 10:26:58 -47
Tonasket 10:20:37 -37.3 Dark Down 49.3 160.9 Up 10:14:14 - 10:26:59 -66
Okanogan 10:20:39 -37.6 Dark Down 49.6 160.5 Up 10:14:16 - 10:27:01 -83
Brewster 10:20:41 -37.9 Dark Down 49.8 160.1 Up 10:14:18 - 10:27:03 -94
Manson/Chelan 10:20:43 -38.2 Dark Down 50.0 159.5 Up 10:14:20 - 10:27:05 -95
Wenatchee 10:20:46 -38.6 Dark Down 50.4 159.1 Up 10:14:23 - 10:27:08 -121
Ellensburg 10:20:48 -38.9 Dark Down 50.7 158.6 Up 10:14:26 - 10:27:11 -141
Yakima 10:20:50 -39.2 Dark Down 51.1 158.4 Up 10:14:28 - 10:27:13 -169
Toppenish/White Swan 10:20:50 -39.2 Dark Down 51.3 158.5 Up 10:14:28 - 10:27:13 -190
Goldendale 10:20:54 -39.8 Dark Down 51.7 157.6 Up 10:14:32 - 10:27:17 -212
The Dalles 10:20:57 -40.1 Dark Down 51.8 157.0 Up 10:14:34 - 10:27:19 -214
Pasco 10:20:45 -38.6 Dark Down 51.7 160.4 Up 10:14:22 - 10:27:07 -246
Maupin 10:20:58 -40.3 Dark Down 52.3 156.9 Up 10:14:36 - 10:27:21 -248
PNWRO 10:20:45 -38.6 Dark Down 52.0 160.6 Up 10:14:23 - 10:27:08 -272
Sisters 10:21:04 -41.1 Dark Down 52.9 155.7 Up 10:14:41 - 10:27:26 -291
Redmond 10:21:02 -40.9 Dark Down 53.1 156.4 Up 10:14:40 - 10:27:25 -308
Bend 10:21:04 -41.1 Dark Down 53.2 156.0 Up 10:14:41 - 10:27:26 -318
Oregon Observatory 10:21:05 -41.3 Dark Down 53.3 155.7 Up 10:14:42 - 10:27:27 -325
La Pine/Gilchrist 10:21:06 -41.5 Dark Down 53.5 155.5 Up 10:14:43 - 10:27:28 -337
North Lake 10:21:05 -41.4 Dark Down 54.1 156.2 Up 10:14:43 - 10:27:28 -392
Chiloquin 10:21:12 -42.3 Dark Down 54.4 154.4 Up 10:14:50 - 10:27:35 -404
Klamath Falls 10:21:13 -42.5 Dark Down 54.8 154.3 Up 10:14:51 - 10:27:36 -432
Paisley 10:21:05 -41.5 Dark Down 54.7 156.5 Up 10:14:42 - 10:27:27 -447
Lakeview 10:21:07 -41.7 Dark Down 55.2 156.6 Up 10:14:44 - 10:27:29 -492
Fall River/Burney 10:21:16 -42.9 Dark Down 55.9 154.2 Up 10:14:53 - 10:27:38 -535
Cedarville 10:21:08 -41.9 Dark Down 55.9 156.5 Up 10:14:46 - 10:27:31 -548
Susanville 10:21:15 -42.8 Dark Down 56.8 155.0 Up 10:14:53 - 10:27:38 -613
Greenville 10:21:17 -43.1 Dark Down 56.9 154.4 Up 10:14:55 - 10:27:40 -622
Gimple 10:21:18 -43.1 Dark Down 56.9 154.5 Up 10:14:55 - 10:27:40 -626
Quincy 10:21:19 -43.3 Dark Down 57.1 154.2 Up 10:14:56 - 10:27:41 -637
Portola 10:21:17 -43.0 Dark Down 57.4 155.0 Up 10:14:54 - 10:27:39 -667
Reno 10:21:15 -42.7 Dark Down 57.8 155.9 Up 10:14:52 - 10:27:37 -714
Carson City 10:21:16 -42.9 Dark Down 58.1 155.7 Up 10:14:54 - 10:27:39 -743
Gardnerville 10:21:17 -43.0 Dark Down 58.4 155.6 Up 10:14:54 - 10:27:39 -764
Yerington 10:21:14 -42.6 Dark Down 58.5 156.7 Up 10:14:51 - 10:27:36 -785
Hawthorne 10:21:13 -42.5 Dark Down 59.1 157.4 Up 10:14:50 - 10:27:35 -844
Lee Vining 10:21:18 -43.1 Dark Down 59.5 156.1 Up 10:14:55 - 10:27:40 -868
Tonopah 10:21:08 -41.8 Dark Down 59.9 159.7 Up 10:14:45 - 10:27:30 -941
Bishop 10:21:16 -42.9 Dark Down 60.3 157.1 Up 10:14:54 - 10:27:39 -947
CPSLO 10:21:36 -45.4 Dark Down 61.3 151.3 Up 10:15:14 - 10:27:59 -1015
Beatty 10:21:08 -42.0 Dark Down 61.2 159.8 Up 10:14:46 - 10:27:31 -1055
Indian Springs 10:21:04 -41.4 Dark Down 61.7 161.8 Up 10:14:42 - 10:27:27 -1128
Henderson 10:21:03 -41.1 Dark Down 62.4 162.9 Up 10:14:40 - 10:27:25 -1203
Wildwood 10:21:30 -44.5 Dark Down 63.2 154.3 Up 10:15:07 - 10:27:52 -1206
Dunrhomin 10:19:57 -32.5 Dark Down 59.1 183.1 Up 10:13:35 - 10:26:20 -1253
Laughlin/Bullhead City 10:21:04 -41.1 Dark Down 63.4 163.2 Up 10:14:42 - 10:27:27 -1294
Patrick 10:20:59 -40.5 Dark Down 63.3 164.8 Up 10:14:36 - 10:27:21 -1304
Kingman/Dolan Springs 10:21:01 -40.7 Dark Down 63.5 164.3 Up 10:14:39 - 10:27:24 -1314
Mohave Valley 10:21:06 -41.2 Dark Down 63.6 163.1 Up 10:14:43 - 10:27:28 -1317
Idyllwild 10:21:21 -43.3 Dark Down 64.1 157.8 Up 10:14:58 - 10:27:43 -1320
Lake Havasu City 10:21:05 -41.2 Dark Down 64.1 163.4 Up 10:14:43 - 10:27:28 -1362
Parker 10:21:06 -41.3 Dark Down 64.4 163.3 Up 10:14:44 - 10:27:29 -1394
Blythe 10:21:09 -41.7 Dark Down 64.8 162.3 Up 10:14:47 - 10:27:32 -1425
Calipatria 10:21:17 -42.6 Dark Down 65.1 159.9 Up 10:14:55 - 10:27:40 -1426
Yuma 10:21:14 -42.1 Dark Down 65.7 161.6 Up 10:14:51 - 10:27:36 -1503
George/Scottsdale 10:20:54 -39.6 Dark Down 65.3 168.5 Up 10:14:32 - 10:27:17 -1538

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, (2021/10/12 10:22UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  7.10 149
Bellatrix      05:25:07.8 +06:20:58  1.6 12.12 153
88 Tau         04:35:39.3 +10:09:39  4.5  0.90 146
PPM 147779     04:39:00.0 +09:38:21  8.1  0.37 146
PPM 147735     04:37:07.1 +09:23:52  9.1  0.17 145
160427         04:37:47.3 +09:25:37 15.3       146
Positions are for J2000

Event circumstances last updated at 2021/10/09 01:01:36 UT

Marc W. Buie, Southwest Research Institute

RECON