RECON: TNO occultation with 523800

Event between (523800) 17KZ31 and star GA1100:03170314 with event index number of 1341177

Geocentric closest approach at 2023/12/20 09:42:22 UTC

J2000 position of star is 09:15:25.4 +20:20:53
Equinox of date position of star is 09:16:33.9 +20:15:48
Stellar brightness G=15.5, use SENSEUP=128
Star is 129 degrees from the moon. Moon is 57% illuminated.
TNO apparent brightness V=22.1

[RECON map]
TNO is 15.8 AU from the Sun and 15.1 AU from the Earth.
The TNO is moving 29.2 km/sec on the sky relative to the star, or, 9.6 arcsec/hr.
The 1-sigma error in the time of the event is 143 seconds.
The 1-sigma cross-track error in the shadow position is 3466 km.
The sky-plane scale is 10954.5 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=55.0 km assuming a 5% albedo -- 2.1 sec chord
Diameter=22.4 km assuming a 30% albedo -- 0.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523800, (2023/12/20 09:42UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:38.8 +11:50:57  1.3 15.21 143
PPM 099404     09:14:59.2 +21:10:59  6.1  1.03 128
PPM 099441     09:17:25.8 +19:58:20  8.7  0.31 129
523800         09:16:46.9 +20:14:51 15.5       129
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 22.5 km RECON observability=1.0 and success probability=12.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 09:44:02 -55.8 Dark Down 54.8 139.7 Up 09:31:39 - 09:56:25 2697
Kelowna 09:44:02 -56.1 Dark Down 55.1 139.1 Up 09:31:39 - 09:56:25 2655
Peachland 09:44:03 -56.3 Dark Down 55.0 138.5 Up 09:31:40 - 09:56:26 2638
Summerland 09:44:03 -56.4 Dark Down 55.2 138.5 Up 09:31:40 - 09:56:26 2625
Penticton 09:44:02 -56.4 Dark Down 55.3 138.6 Up 09:31:39 - 09:56:25 2620
Oliver 09:44:02 -56.6 Dark Down 55.5 138.3 Up 09:31:39 - 09:56:25 2585
Anarchist Mountain Observatory 09:44:02 -56.6 Dark Down 55.7 138.4 Up 09:31:39 - 09:56:25 2572
Tonasket 09:44:02 -56.8 Dark Down 55.9 138.0 Up 09:31:39 - 09:56:25 2539
Okanogan 09:44:02 -57.1 Dark Down 56.1 137.4 Up 09:31:39 - 09:56:25 2502
Brewster 09:44:02 -57.4 Dark Down 56.2 136.9 Up 09:31:39 - 09:56:25 2471
Victoria 09:44:11 -58.9 Dark Down 54.2 132.2 Up 09:31:48 - 09:56:34 2446
Manson/Chelan 09:44:03 -57.7 Dark Down 56.2 136.1 Up 09:31:40 - 09:56:26 2442
Entiat 09:44:03 -57.9 Dark Down 56.3 135.8 Up 09:31:40 - 09:56:26 2419
Wenatchee 09:44:03 -58.1 Dark Down 56.5 135.4 Up 09:31:40 - 09:56:26 2391
Ellensburg 09:44:04 -58.5 Dark Down 56.7 134.6 Up 09:31:41 - 09:56:27 2345
Yakima 09:44:04 -58.8 Dark Down 56.9 134.1 Up 09:31:41 - 09:56:27 2303
Pasco 09:44:00 -58.2 Dark Down 57.9 135.9 Up 09:31:37 - 09:56:23 2298
Toppenish/White Swan 09:44:03 -58.8 Dark Down 57.2 134.1 Up 09:31:40 - 09:56:26 2284
PNWRO 09:44:00 -58.2 Dark Down 58.2 136.0 Up 09:31:37 - 09:56:23 2277
Goldendale 09:44:04 -59.4 Dark Down 57.3 132.9 Up 09:31:41 - 09:56:27 2219
The Dalles 09:44:05 -59.7 Dark Down 57.3 132.1 Up 09:31:42 - 09:56:28 2188
Maupin 09:44:04 -59.9 Dark Down 57.6 131.8 Up 09:31:41 - 09:56:27 2147
Redmond 09:44:04 -60.5 Dark Down 58.2 130.6 Up 09:31:41 - 09:56:27 2052
Niwot 09:43:20 -51.6 Dark Down 68.6 155.0 Up 09:30:57 - 09:55:43 2049
Sisters 09:44:05 -60.7 Dark Down 58.0 130.0 Up 09:31:42 - 09:56:28 2046
SwRI 09:43:20 -51.6 Dark Down 68.7 154.6 Up 09:30:57 - 09:55:43 2035
Bend 09:44:04 -60.7 Dark Down 58.2 130.1 Up 09:31:41 - 09:56:27 2027
Oregon Observatory 09:44:04 -60.9 Dark Down 58.3 129.7 Up 09:31:41 - 09:56:27 2006
La Pine/Gilchrist 09:44:05 -61.1 Dark Down 58.4 129.3 Up 09:31:42 - 09:56:28 1984
North Lake 09:44:03 -61.0 Dark Down 59.0 129.7 Up 09:31:40 - 09:56:26 1951
Paisley 09:44:02 -61.1 Dark Down 59.5 129.5 Up 09:31:39 - 09:56:25 1901
Lakeview 09:44:01 -61.2 Dark Down 60.0 129.1 Up 09:31:38 - 09:56:24 1852
Klamath Falls 09:44:05 -62.1 Dark Down 59.1 127.1 Up 09:31:42 - 09:56:28 1826
Cedarville 09:44:00 -61.5 Dark Down 60.5 128.4 Up 09:31:37 - 09:56:23 1788
Fall River/Burney 09:44:03 -62.5 Dark Down 60.1 126.0 Up 09:31:40 - 09:56:26 1710
Susanville 09:44:01 -62.3 Dark Down 60.9 126.2 Up 09:31:38 - 09:56:24 1660
Gimple 09:44:01 -62.6 Dark Down 60.9 125.4 Up 09:31:38 - 09:56:24 1626
Greenville 09:44:01 -62.7 Dark Down 60.9 125.3 Up 09:31:38 - 09:56:24 1625
Quincy 09:44:01 -62.8 Dark Down 61.0 125.0 Up 09:31:38 - 09:56:24 1603
Portola 09:44:00 -62.5 Dark Down 61.3 125.5 Up 09:31:37 - 09:56:23 1601
Reno 09:43:58 -62.2 Dark Down 61.9 126.1 Up 09:31:35 - 09:56:21 1588
Carson City 09:43:58 -62.3 Dark Down 62.1 125.6 Up 09:31:35 - 09:56:21 1550
Yerington 09:43:56 -62.0 Dark Down 62.6 126.2 Up 09:31:33 - 09:56:19 1545
Gardnerville 09:43:58 -62.4 Dark Down 62.3 125.2 Up 09:31:35 - 09:56:21 1526
Hawthorne 09:43:55 -61.8 Dark Down 63.2 126.3 Up 09:31:32 - 09:56:18 1509
Tonopah 09:43:50 -61.0 Dark Down 64.4 127.7 Up 09:31:27 - 09:56:13 1494
Lee Vining 09:43:55 -62.4 Dark Down 63.2 124.6 Up 09:31:32 - 09:56:18 1437
Bishop 09:43:53 -62.1 Dark Down 64.1 124.7 Up 09:31:30 - 09:56:16 1392
Beatty 09:43:48 -61.1 Dark Down 65.4 126.5 Up 09:31:25 - 09:56:11 1385
Indian Springs 09:43:45 -60.4 Dark Down 66.3 127.7 Up 09:31:22 - 09:56:08 1379
Henderson 09:43:42 -60.0 Dark Down 67.0 127.9 Up 09:31:19 - 09:56:05 1342
Patrick 09:43:39 -59.3 Dark Down 68.1 128.7 Up 09:31:16 - 09:56:02 1307
DCO 09:43:37 -58.8 Dark Down 68.7 129.4 Up 09:31:14 - 09:56:00 1296
Searchlight/Boulder City 09:43:42 -60.1 Dark Down 67.4 126.9 Up 09:31:19 - 09:56:05 1283
Kingman/Dolan Springs 09:43:39 -59.5 Dark Down 68.1 127.9 Up 09:31:16 - 09:56:02 1279
Laughlin/Bullhead City 09:43:41 -59.9 Dark Down 67.8 126.9 Up 09:31:18 - 09:56:04 1262
Mohave Valley 09:43:41 -60.0 Dark Down 68.0 126.4 Up 09:31:18 - 09:56:04 1233
Lake Havasu City 09:43:39 -59.9 Dark Down 68.4 126.0 Up 09:31:16 - 09:56:02 1198
George/Scottsdale 09:43:32 -58.0 Dark Down 70.4 129.0 Up 09:31:09 - 09:55:55 1189
Parker 09:43:39 -59.9 Dark Down 68.6 125.4 Up 09:31:16 - 09:56:02 1162
CPSLO 09:43:58 -64.5 Dark Down 63.6 117.9 Up 09:31:35 - 09:56:21 1119
Blythe 09:43:39 -60.3 Dark Down 68.7 123.7 Up 09:31:16 - 09:56:02 1099
Idyllwild 09:43:46 -61.9 Dark Down 67.1 120.5 Up 09:31:23 - 09:56:09 1052
Wildwood 09:43:51 -63.3 Dark Down 65.6 118.5 Up 09:31:28 - 09:56:14 1041
Calipatria 09:43:42 -61.1 Dark Down 68.3 121.1 Up 09:31:19 - 09:56:05 1021
Yuma 09:43:38 -60.5 Dark Down 69.2 121.6 Up 09:31:15 - 09:56:01 1001

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 523800, (2023/12/20 09:42UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 15.21 143
PPM 099404     09:13:37.2 +21:16:59  6.1  1.03 128
PPM 099441     09:16:04.4 +20:04:23  8.7  0.31 129
523800         09:15:25.4 +20:20:53 15.5       129
Positions are for J2000

Event circumstances last updated at 2020/02/27 21:45:30 UT

Marc W. Buie, Southwest Research Institute

RECON