RECON: TNO occultation with 508869

Event between (508869) 02VT130 and star GA1140:01779197 with event index number of 1838239

Geocentric closest approach at 2028/02/29 07:13:35 UTC

J2000 position of star is 06:03:13.0 +24:28:41
Equinox of date position of star is 06:04:35.5 +24:28:33
Stellar brightness G=14.4, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 68 degrees from the moon. Moon is 13% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 43.4 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 6.6 km/sec on the sky relative to the star, or, 0.8 arcsec/hr.
The 1-sigma error in the time of the event is 1259 seconds.
The 1-sigma cross-track error in the shadow position is 1576 km.
The sky-plane scale is 31181.1 km/arcsec.

The TNO has an absolute magnitude Hv=5.7
Diameter=436.5 km assuming a 5% albedo -- 65.7 sec chord
Diameter=178.2 km assuming a 30% albedo -- 26.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 508869, (2028/02/29 07:14UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:41.8 +07:24:36  0.4 17.18  69
Alnath         05:28:04.5 +28:37:43  1.6  9.23  60
1 Gem          06:05:50.0 +23:15:34  4.2  1.23  68
PPM 095328     06:05:56.6 +25:26:25  8.2  0.99  68
PPM 095235     06:03:01.8 +24:24:38  9.8  0.44  68
PPM 095318     06:05:44.4 +24:43:43 10.7  0.31  68
508869         06:04:56.8 +24:28:31 14.4        69
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 0.7 sigma about the mid-time.
The median site spacing is 27.4 km RECON observability=1.0 and success probability=29.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:03:41 -45.6 Dark Down 32.5 268.9 Up 06:48:41 - 07:18:41 2419
Kamloops 07:04:47 -44.7 Dark Down 41.5 258.1 Up 06:49:47 - 07:19:47 1980
Kelowna 07:04:33 -45.7 Dark Down 41.1 259.5 Up 06:49:33 - 07:19:33 1924
Peachland 07:04:32 -45.7 Dark Down 41.3 259.4 Up 06:49:32 - 07:19:32 1908
Summerland 07:04:32 -45.9 Dark Down 41.3 259.6 Up 06:49:32 - 07:19:32 1896
Penticton 07:04:31 -46.0 Dark Down 41.2 259.7 Up 06:49:31 - 07:19:31 1892
Oliver 07:04:28 -46.3 Dark Down 41.3 260.0 Up 06:49:28 - 07:19:28 1859
Anarchist Mountain Observatory 07:04:23 -46.5 Dark Down 41.2 260.3 Up 06:49:23 - 07:19:23 1848
Tonasket 07:04:22 -46.7 Dark Down 41.3 260.5 Up 06:49:22 - 07:19:22 1818
Okanogan 07:04:20 -47.0 Dark Down 41.5 260.7 Up 06:49:20 - 07:19:20 1783
Brewster 07:04:19 -47.2 Dark Down 41.7 260.7 Up 06:49:19 - 07:19:19 1754
Manson/Chelan 07:04:20 -47.3 Dark Down 41.9 260.6 Up 06:49:20 - 07:19:20 1726
Victoria 07:04:49 -45.7 Dark Down 43.9 257.3 Up 06:49:49 - 07:19:49 1721
Wenatchee 07:04:16 -47.7 Dark Down 42.1 260.9 Up 06:49:16 - 07:19:16 1678
Ellensburg 07:04:14 -48.0 Dark Down 42.4 261.1 Up 06:49:14 - 07:19:14 1635
Yakima 07:04:12 -48.3 Dark Down 42.4 261.4 Up 06:49:12 - 07:19:12 1596
Toppenish/White Swan 07:04:09 -48.6 Dark Down 42.4 261.7 Up 06:49:09 - 07:19:09 1579
PNWRO 07:03:56 -49.3 Dark Down 41.4 263.2 Up 06:48:56 - 07:18:56 1576
Goldendale 07:04:08 -48.9 Dark Down 42.7 261.9 Up 06:49:08 - 07:19:08 1517
The Dalles 07:04:09 -49.0 Dark Down 43.0 261.8 Up 06:49:09 - 07:19:09 1487
Maupin 07:04:05 -49.4 Dark Down 43.0 262.3 Up 06:49:05 - 07:19:05 1450
Dunrhomin 07:01:41 -57.4 Dark Down 31.8 276.5 Up 06:46:41 - 07:16:41 1387
CU-SBO 07:01:39 -57.6 Dark Down 31.9 276.6 Up 06:46:39 - 07:16:39 1361
Sisters 07:04:01 -50.0 Dark Down 43.5 262.7 Up 06:49:01 - 07:19:01 1354
Bend 07:03:58 -50.3 Dark Down 43.3 263.1 Up 06:48:58 - 07:18:58 1336
Oregon Observatory 07:03:57 -50.4 Dark Down 43.5 263.1 Up 06:48:57 - 07:18:57 1317
North Lake 07:03:48 -51.1 Dark Down 43.2 264.1 Up 06:48:48 - 07:18:48 1266
Chiloquin 07:03:51 -51.4 Dark Down 43.9 264.1 Up 06:48:51 - 07:18:51 1178
Lakeview 07:03:36 -52.2 Dark Down 42.9 265.5 Up 06:48:36 - 07:18:36 1175
Klamath Falls 07:03:46 -51.7 Dark Down 43.9 264.4 Up 06:48:46 - 07:18:46 1146
Cedarville 07:03:29 -52.8 Dark Down 42.8 266.2 Up 06:48:29 - 07:18:29 1114
Fall River/Burney 07:03:36 -52.8 Dark Down 43.8 265.8 Up 06:48:36 - 07:18:36 1038
Susanville 07:03:26 -53.6 Dark Down 43.3 266.9 Up 06:48:26 - 07:18:26 992
Gimple 07:03:24 -53.8 Dark Down 43.4 267.0 Up 06:48:24 - 07:18:24 959
Greenville 07:03:26 -53.7 Dark Down 43.5 267.0 Up 06:48:26 - 07:18:26 958
Quincy 07:03:24 -53.9 Dark Down 43.5 267.1 Up 06:48:24 - 07:18:24 937
Portola 07:03:19 -54.2 Dark Down 43.2 267.6 Up 06:48:19 - 07:18:19 936
Reno 07:03:13 -54.7 Dark Down 42.7 268.2 Up 06:48:13 - 07:18:13 925
Carson City 07:03:10 -55.0 Dark Down 42.7 268.6 Up 06:48:10 - 07:18:10 890
Yerington 07:03:03 -55.4 Dark Down 42.2 269.1 Up 06:48:03 - 07:18:03 885
Gardnerville 07:03:08 -55.2 Dark Down 42.7 268.8 Up 06:48:08 - 07:18:08 866
Hawthorne 07:02:56 -56.0 Dark Down 41.9 269.9 Up 06:47:56 - 07:17:56 852
Tonopah 07:02:42 -56.9 Dark Down 40.8 271.1 Up 06:47:42 - 07:17:42 841
Lee Vining 07:02:56 -56.3 Dark Down 42.2 270.1 Up 06:47:56 - 07:17:56 783
Bishop 07:02:46 -57.1 Dark Down 41.7 271.0 Up 06:47:46 - 07:17:46 741
Beatty 07:02:30 -58.1 Dark Down 40.4 272.4 Up 06:47:30 - 07:17:30 736
Indian Springs 07:02:20 -58.8 Dark Down 39.6 273.2 Up 06:47:20 - 07:17:20 732
Henderson 07:02:11 -59.5 Dark Down 39.0 274.0 Up 06:47:11 - 07:17:11 696
Patrick 07:01:59 -60.4 Dark Down 38.1 275.1 Up 06:46:59 - 07:16:59 664
Kingman/Dolan Springs 07:01:59 -60.5 Dark Down 38.2 275.2 Up 06:46:59 - 07:16:59 636
Laughlin/Bullhead City 07:02:03 -60.4 Dark Down 38.6 274.9 Up 06:47:03 - 07:17:03 620
Mohave Valley 07:02:01 -60.6 Dark Down 38.6 275.1 Up 06:47:01 - 07:17:01 592
Lake Havasu City 07:01:57 -61.1 Dark Down 38.4 275.6 Up 06:46:57 - 07:16:57 558
George/Scottsdale 07:01:33 -62.6 Dark Down 36.4 277.3 Up 06:46:33 - 07:16:33 550
Parker 07:01:53 -61.4 Dark Down 38.3 275.8 Up 06:46:53 - 07:16:53 524
Idyllwild 07:02:09 -60.8 Dark Down 40.3 275.0 Up 06:47:09 - 07:17:09 416
Wildwood 07:02:27 -59.8 Dark Down 41.8 273.8 Up 06:47:27 - 07:17:27 402
Calipatria 07:01:57 -61.8 Dark Down 39.3 276.1 Up 06:46:57 - 07:16:57 385
Yuma 07:01:47 -62.6 Dark Down 38.5 276.8 Up 06:46:47 - 07:16:47 366

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 508869, (2028/02/29 07:14UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 17.18  69
Alnath         05:26:17.6 +28:36:23  1.6  9.23  60
1 Gem          06:04:07.2 +23:15:46  4.2  1.23  68
PPM 095328     06:04:12.1 +25:26:37  8.2  0.99  68
PPM 095235     06:01:18.1 +24:24:44  9.8  0.44  68
PPM 095318     06:04:00.5 +24:43:55 10.7  0.31  68
508869         06:03:13.0 +24:28:41 14.4        68
Positions are for J2000

Event circumstances last updated at 2022/05/22 23:14:43 UT

Marc W. Buie, Southwest Research Institute

RECON