RECON: TNO occultation with 04LW31

Event between 04LW31 and star GA0680:35225499 with event index number of 2577572

Geocentric closest approach at 2023/08/08 06:59:32 UTC

J2000 position of star is 19:32:38.0 -21:00:47
Equinox of date position of star is 19:34:01.6 -20:57:40
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 112 degrees from the moon. Moon is 52% illuminated.
Apparent brightness V=23.7

[RECON map]
Object is 44.7 AU from the Sun and 43.7 AU from the Earth.
Apparent velocity is 22.3 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 359 seconds.
The 1-sigma cross-track error in the shadow position is 3326 km.
The sky-plane scale is 31716.2 km/arcsec.

The object has an absolute magnitude Hv=7.2
Diameter=216.8 km assuming a 5% albedo -- 9.7 sec chord
Diameter=88.5 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 04LW31, (2023/08/08 07:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:51.5 -26:28:56  0.9 42.07 154
Nunki          18:56:43.6 -26:15:55  2.0 10.05 121
50 Sgr         19:27:43.5 -21:43:41  5.6  1.66 114
PPM 269906     19:32:48.3 -20:59:20  7.5  0.29 112
04LW31         19:34:01.7 -20:57:39 16.2       112
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 2.5 sigma about the mid-time.
The median site spacing is 18.1 km RECON observability=0.8 and success probability=0.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 06:58:24 -21.5 Dark Up 18.0 187.5 Really Low 06:43:24 - 07:13:24 12738
Victoria 06:58:32 -22.8 Dark Up 20.3 184.6 Low 06:43:32 - 07:13:32 12701
Peachland 06:58:22 -22.4 Dark Up 18.9 188.1 Really Low 06:43:22 - 07:13:22 12694
Kelowna 06:58:20 -22.4 Dark Up 18.7 188.4 Really Low 06:43:20 - 07:13:20 12693
Summerland 06:58:21 -22.6 Dark Up 19.0 188.2 Really Low 06:43:21 - 07:13:21 12686
Penticton 06:58:20 -22.7 Dark Up 19.1 188.3 Really Low 06:43:20 - 07:13:20 12682
Oliver 06:58:21 -23.0 Dark Up 19.4 188.3 Really Low 06:43:21 - 07:13:21 12668
Anarchist Mountain Observatory 06:58:19 -23.2 Dark Up 19.6 188.5 Really Low 06:43:19 - 07:13:19 12659
Okanogan 06:58:19 -23.8 Dark Up 20.2 188.3 Low 06:43:19 - 07:13:19 12636
Brewster 06:58:20 -24.0 Dark Up 20.5 188.1 Low 06:43:20 - 07:13:20 12628
Manson/Chelan 06:58:22 -24.1 Dark Up 20.7 187.8 Low 06:43:22 - 07:13:22 12625
Wenatchee 06:58:22 -24.6 Dark Up 21.2 187.7 Low 06:43:22 - 07:13:22 12608
Ellensburg 06:58:22 -24.9 Dark Up 21.7 187.5 Low 06:43:22 - 07:13:22 12594
Yakima 06:58:23 -25.3 Dark Up 22.1 187.5 Low 06:43:23 - 07:13:23 12577
Toppenish/White Swan 06:58:22 -25.5 Dark Up 22.3 187.6 Low 06:43:22 - 07:13:22 12564
The Dalles 06:58:25 -26.1 Dark Up 23.1 186.9 Low 06:43:25 - 07:13:25 12542
Sleaford 06:57:42 -21.7 Dark Up 14.4 201.1 Really Low 06:42:42 - 07:12:42 12537
PNWRO 06:58:18 -26.2 Dark Up 22.5 189.2 Low 06:43:18 - 07:13:18 12523
Maupin 06:58:24 -26.5 Dark Up 23.5 187.0 Low 06:43:24 - 07:13:24 12522
Sisters 06:58:27 -27.2 Dark Up 24.4 186.6 Low 06:43:27 - 07:13:27 12489
Bend 06:58:27 -27.5 Dark Up 24.6 186.9 Low 06:43:27 - 07:13:27 12474
Oregon Observatory 06:58:26 -27.6 Dark Up 24.8 186.7 Low 06:43:26 - 07:13:26 12468
Chiloquin 06:58:29 -28.8 Dark Up 26.2 186.4 Low 06:43:29 - 07:13:29 12410
Klamath Falls 06:58:26 -29.1 Dark Up 26.5 186.5 Low 06:43:26 - 07:13:26 12391
Cedarville 06:58:21 -30.2 Dark Up 27.0 188.2 Low 06:43:21 - 07:13:21 12327
Fall River/Burney 06:58:26 -30.3 Dark Up 27.6 186.9 Low 06:43:26 - 07:13:26 12323
Greenville 06:58:25 -31.3 Dark Up 28.5 187.5 Low 06:43:25 - 07:13:25 12267
Gimple 06:58:25 -31.3 Dark Up 28.5 187.6 Low 06:43:25 - 07:13:25 12265
Quincy 06:58:24 -31.5 Dark Up 28.7 187.5 Low 06:43:24 - 07:13:24 12256
Portola 06:58:22 -31.7 Dark Up 28.8 188.0 Low 06:43:22 - 07:13:22 12240
Reno 06:58:22 -32.1 Dark Up 29.0 188.7 Low 06:43:22 - 07:13:22 12214
Carson City 06:58:21 -32.5 Dark Up 29.3 188.7 Low 06:43:21 - 07:13:21 12193
Gardnerville 06:58:19 -32.7 Dark Up 29.6 188.8 Low 06:43:19 - 07:13:19 12178
Yerington 06:58:18 -32.8 Dark Up 29.4 189.4 Low 06:43:18 - 07:13:18 12170
Hawthorne 06:58:15 -33.4 Dark Up 29.8 190.0 Low 06:43:15 - 07:13:15 12133
Lee Vining 06:58:17 -33.8 Dark Up 30.4 189.6 Up 06:43:17 - 07:13:17 12110
Bishop 06:58:14 -34.6 Dark Up 30.9 190.4 Up 06:43:14 - 07:13:14 12060
Beatty 06:58:10 -35.4 Dark Up 31.1 192.2 Up 06:43:10 - 07:13:10 11998
Dunrhomin 06:57:30 -33.5 Dark Up 25.2 203.3 Low 06:42:30 - 07:12:30 11933
Nikitin 06:57:29 -33.7 Dark Up 25.4 203.4 Low 06:42:29 - 07:12:29 11923
CU-SBO 06:57:30 -33.8 Dark Up 25.5 203.3 Low 06:42:30 - 07:12:30 11921
Wildwood 06:58:15 -37.6 Dark Up 34.2 190.5 Up 06:43:15 - 07:13:15 11861
Patrick 06:57:59 -37.4 Dark Up 32.0 195.5 Up 06:42:59 - 07:12:59 11843
Laughlin/Bullhead City 06:58:01 -37.5 Dark Up 32.4 194.7 Up 06:43:01 - 07:13:01 11843
Idyllwild 06:58:08 -38.4 Dark Up 34.2 192.7 Up 06:43:08 - 07:13:08 11798
Lake Havasu City 06:57:59 -38.2 Dark Up 33.0 195.1 Up 06:42:59 - 07:12:59 11793
Calipatria 06:58:04 -39.3 Dark Up 34.6 194.1 Up 06:43:04 - 07:13:04 11730
George/Scottsdale 06:57:50 -39.4 Dark Up 33.2 197.9 Up 06:42:50 - 07:12:50 11685
Yuma 06:58:01 -39.9 Dark Up 34.8 195.1 Up 06:43:01 - 07:13:01 11681

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 04LW31, (2023/08/08 07:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 42.07 154
Nunki          18:55:15.9 -26:17:49  2.0 10.05 121
50 Sgr         19:26:19.2 -21:46:36  5.6  1.66 114
PPM 269906     19:31:24.6 -21:02:25  7.5  0.29 112
04LW31         19:32:38.0 -21:00:47 16.2       112
Positions are for J2000

Event circumstances last updated at 2023/07/27 03:49:19 UT

Marc W. Buie, Southwest Research Institute

RECON