RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star GA0880:02946908 with event index number of 2457568

Geocentric closest approach at 2023/01/23 09:29:55 UTC

J2000 position of star is 07:32:18.4 -01:40:37
Equinox of date position of star is 07:33:28.4 -01:43:39
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 140 degrees from the moon. Moon is 4% illuminated.
Apparent brightness V=20.8

[RECON map]
Object is 13.4 AU from the Sun and 12.5 AU from the Earth.
Apparent velocity is 22.3 km/sec on the sky relative to the star, or, 8.8 arcsec/hr.
The 1-sigma error in the time of the event is 45 seconds.
The 1-sigma cross-track error in the shadow position is 642 km.
The sky-plane scale is 9074.8 km/arcsec.

The object has an absolute magnitude Hv=9.5
Diameter=83.2 km assuming a 5% albedo -- 3.4 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 281371, (2023/01/23 09:30UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:09.9 -16:44:55 -1.5 19.00 122
Alhena         06:39:02.6 +16:22:39  1.9 22.55 133
25 Mon         07:38:25.5 -04:09:51  5.1  2.73 140
PPM 176988     07:33:59.2 -02:05:08  7.0  0.38 140
PPM 176989     07:34:27.4 -01:39:47  9.1  0.25 140
281371         07:33:28.5 -01:43:39 16.9       140
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 24.7 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)
Sleaford 09:28:22 -48.4 Dark Down 24.0 231.4 Low 09:24:07 - 09:32:37 6534
Kamloops 09:28:52 -55.4 Dark Down 31.3 217.3 Up 09:24:37 - 09:33:07 6362
Kelowna 09:28:48 -55.7 Dark Down 31.6 218.6 Up 09:24:33 - 09:33:03 6318
Peachland 09:28:49 -55.9 Dark Down 31.8 218.3 Up 09:24:34 - 09:33:04 6309
Summerland 09:28:48 -56.0 Dark Down 31.8 218.5 Up 09:24:33 - 09:33:03 6300
Penticton 09:28:47 -56.1 Dark Down 31.9 218.6 Up 09:24:32 - 09:33:02 6297
Oliver 09:28:47 -56.3 Dark Down 32.1 218.7 Up 09:24:32 - 09:33:02 6274
Anarchist Mountain Observatory 09:28:46 -56.4 Dark Down 32.2 219.0 Up 09:24:31 - 09:33:01 6265
Okanogan 09:28:45 -57.0 Dark Down 32.8 219.0 Up 09:24:30 - 09:33:00 6221
Victoria 09:28:56 -58.2 Dark Down 34.2 214.8 Up 09:24:41 - 09:33:11 6203
Brewster 09:28:45 -57.3 Dark Down 33.1 218.9 Up 09:24:30 - 09:33:00 6202
Manson/Chelan 09:28:45 -57.6 Dark Down 33.4 218.6 Up 09:24:30 - 09:33:00 6186
Wenatchee 09:28:45 -58.1 Dark Down 33.8 218.6 Up 09:24:30 - 09:33:00 6153
Ellensburg 09:28:44 -58.5 Dark Down 34.3 218.6 Up 09:24:29 - 09:32:59 6124
Yakima 09:28:44 -58.9 Dark Down 34.6 218.7 Up 09:24:29 - 09:32:59 6096
Toppenish/White Swan 09:28:42 -59.0 Dark Down 34.7 219.0 Up 09:24:27 - 09:32:57 6082
PNWRO 09:28:37 -58.6 Dark Down 34.3 220.8 Up 09:24:22 - 09:32:52 6069
The Dalles 09:28:43 -59.9 Dark Down 35.6 218.5 Up 09:24:28 - 09:32:58 6022
Maupin 09:28:42 -60.2 Dark Down 35.9 218.8 Up 09:24:27 - 09:32:57 5994
Sisters 09:28:42 -61.1 Dark Down 36.8 218.6 Up 09:24:27 - 09:32:57 5928
Bend 09:28:40 -61.2 Dark Down 36.9 219.0 Up 09:24:25 - 09:32:55 5913
Oregon Observatory 09:28:40 -61.4 Dark Down 37.1 218.9 Up 09:24:25 - 09:32:55 5900
Chiloquin 09:28:39 -62.6 Dark Down 38.3 219.1 Up 09:24:24 - 09:32:54 5800
Klamath Falls 09:28:37 -62.9 Dark Down 38.5 219.4 Up 09:24:22 - 09:32:52 5775
Dunrhomin 09:27:45 -54.4 Dark Down 30.6 236.9 Up 09:23:30 - 09:32:00 5749
Cedarville 09:28:31 -62.6 Dark Down 38.3 221.5 Up 09:24:16 - 09:32:46 5736
Nikitin 09:27:44 -54.5 Dark Down 30.7 237.0 Up 09:23:29 - 09:31:59 5735
CU-SBO 09:27:44 -54.6 Dark Down 30.8 236.9 Up 09:23:29 - 09:31:59 5730
Fall River/Burney 09:28:34 -63.6 Dark Down 39.3 220.4 Up 09:24:19 - 09:32:49 5689
Gimple 09:28:30 -64.0 Dark Down 39.7 221.5 Up 09:24:15 - 09:32:45 5624
Greenville 09:28:31 -64.1 Dark Down 39.7 221.4 Up 09:24:16 - 09:32:46 5623
Quincy 09:28:30 -64.2 Dark Down 39.9 221.5 Up 09:24:15 - 09:32:45 5608
Portola 09:28:28 -64.1 Dark Down 39.7 222.1 Up 09:24:13 - 09:32:43 5602
Reno 09:28:26 -63.9 Dark Down 39.6 222.9 Up 09:24:11 - 09:32:41 5587
Carson City 09:28:25 -64.1 Dark Down 39.8 223.2 Up 09:24:10 - 09:32:40 5559
Yerington 09:28:23 -63.9 Dark Down 39.7 224.0 Up 09:24:08 - 09:32:38 5549
Gardnerville 09:28:25 -64.3 Dark Down 40.0 223.3 Up 09:24:10 - 09:32:40 5540
Hawthorne 09:28:20 -63.9 Dark Down 39.7 224.8 Up 09:24:05 - 09:32:35 5517
Lee Vining 09:28:20 -64.6 Dark Down 40.4 224.6 Up 09:24:05 - 09:32:35 5468
Bishop 09:28:16 -64.6 Dark Down 40.4 225.7 Up 09:24:01 - 09:32:31 5426
Beatty 09:28:10 -63.8 Dark Down 39.8 227.7 Up 09:23:55 - 09:32:25 5402
Patrick 09:27:58 -62.7 Dark Down 39.0 231.6 Up 09:23:43 - 09:32:13 5303
Laughlin/Bullhead City 09:27:59 -63.3 Dark Down 39.6 231.0 Up 09:23:44 - 09:32:14 5277
Lake Havasu City 09:27:57 -63.4 Dark Down 39.9 231.7 Up 09:23:42 - 09:32:12 5223
George/Scottsdale 09:27:48 -62.0 Dark Down 38.7 234.6 Up 09:23:33 - 09:32:03 5177
Wildwood 09:28:10 -66.6 Dark Down 42.8 227.6 Up 09:23:55 - 09:32:25 5152
Idyllwild 09:28:03 -65.5 Dark Down 41.9 229.8 Up 09:23:48 - 09:32:18 5139
Calipatria 09:27:58 -65.0 Dark Down 41.5 231.4 Up 09:23:43 - 09:32:13 5096
Yuma 09:27:54 -64.5 Dark Down 41.2 232.6 Up 09:23:39 - 09:32:09 5066

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 281371, (2023/01/23 09:30UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:08.0 -16:43:24 -1.5 19.00 122
Alhena         06:37:42.8 +16:23:57  1.9 22.55 133
25 Mon         07:37:16.6 -04:06:39  5.1  2.73 140
PPM 176988     07:32:49.3 -02:02:04  7.0  0.38 140
PPM 176989     07:33:17.3 -01:36:43  9.1  0.25 140
281371         07:32:18.4 -01:40:37 16.9       140
Positions are for J2000

Event circumstances last updated at 2023/01/09 03:27:47 UT

Marc W. Buie, Southwest Research Institute

RECON