RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star GA0820:03610952 with event index number of 1405952

Geocentric closest approach at 2024/12/04 09:43:15 UTC

J2000 position of star is 08:33:18.3 -07:36:03
Equinox of date position of star is 08:34:15.3 -07:40:05
Stellar brightness G=15.2, use SENSEUP=128
Star is 142 degrees from the moon. Moon is 10% illuminated.
TNO apparent brightness V=21.1

[RECON map]
TNO is 14.4 AU from the Sun and 13.9 AU from the Earth.
The TNO is moving 14.8 km/sec on the sky relative to the star, or, 5.3 arcsec/hr.
The 1-sigma error in the time of the event is 325 seconds.
The 1-sigma cross-track error in the shadow position is 4203 km.
The sky-plane scale is 10104.9 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 5.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 281371, (2024/12/04 09:43UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:15.0 -16:45:00 -1.5 27.92 135
Alphard        09:28:48.8 -08:46:04  2.0 13.48 134
3 Hya          08:36:41.2 -08:04:11  6.2  0.66 142
PPM 191455     08:34:35.5 -08:00:02  8.3  0.31 142
PPM 191452     08:34:28.2 -07:50:03  9.4  0.15 142
281371         08:34:31.4 -07:41:14 15.2       142
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 2.8 sigma about the mid-time.
The median site spacing is 7.2 km RECON observability=1.0 and success probability=5.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Summerland 09:41:01 -54.9 Dark Down 27.4 147.2 Low 09:26:01 - 09:56:01 3623
Kelowna 09:40:59 -54.6 Dark Down 27.3 147.5 Low 09:25:59 - 09:55:59 3617
Penticton 09:41:01 -54.9 Dark Down 27.5 147.3 Low 09:26:01 - 09:56:01 3617
Okanagan Falls 09:41:03 -55.1 Dark Down 27.7 147.2 Low 09:26:03 - 09:56:03 3614
Oliver 09:41:03 -55.2 Dark Down 27.8 147.2 Low 09:26:03 - 09:56:03 3610
Manson/Chelan 09:41:11 -56.3 Dark Down 28.7 146.2 Low 09:26:11 - 09:56:11 3607
Entiat 09:41:13 -56.5 Dark Down 28.9 146.1 Low 09:26:13 - 09:56:13 3606
Wenatchee 09:41:15 -56.7 Dark Down 29.1 145.9 Low 09:26:15 - 09:56:15 3604
Ellensburg 09:41:16 -57.0 Dark Down 29.3 145.5 Low 09:26:16 - 09:56:16 3604
Oroville 09:41:04 -55.3 Dark Down 28.1 147.2 Low 09:26:04 - 09:56:04 3601
Anarchist Mountain Observatory 09:41:02 -55.2 Dark Down 28.1 147.3 Low 09:26:02 - 09:56:02 3599
Brewster 09:41:09 -56.0 Dark Down 28.7 146.6 Low 09:26:09 - 09:56:09 3597
The Dalles 09:41:26 -58.2 Dark Down 30.2 144.4 Up 09:26:26 - 09:56:26 3597
Tonasket 09:41:03 -55.4 Dark Down 28.3 147.2 Low 09:26:03 - 09:56:03 3596
Yakima 09:41:19 -57.3 Dark Down 29.6 145.4 Low 09:26:19 - 09:56:19 3595
Okanogan 09:41:06 -55.7 Dark Down 28.5 146.9 Low 09:26:06 - 09:56:06 3595
Goldendale 09:41:23 -57.9 Dark Down 30.2 144.9 Up 09:26:23 - 09:56:23 3588
Toppenish/White Swan 09:41:20 -57.3 Dark Down 29.9 145.5 Low 09:26:20 - 09:56:20 3583
Maupin 09:41:27 -58.4 Dark Down 30.6 144.4 Up 09:26:27 - 09:56:27 3583
Sisters 09:41:34 -59.2 Dark Down 31.1 143.6 Up 09:26:34 - 09:56:34 3581
Madras/Culver 09:41:30 -58.8 Dark Down 31.0 144.2 Up 09:26:30 - 09:56:30 3571
Oregon Observatory 09:41:36 -59.4 Dark Down 31.5 143.6 Up 09:26:36 - 09:56:36 3564
Bend 09:41:33 -59.2 Dark Down 31.4 143.8 Up 09:26:33 - 09:56:33 3564
Redmond 09:41:33 -59.0 Dark Down 31.3 144.0 Up 09:26:33 - 09:56:33 3563
La Pine/Gilchrist 09:41:37 -59.5 Dark Down 31.7 143.5 Up 09:26:37 - 09:56:37 3561
Chiloquin 09:41:45 -60.4 Dark Down 32.4 142.7 Up 09:26:45 - 09:56:45 3546
Klamath Falls 09:41:46 -60.5 Dark Down 32.7 142.7 Up 09:26:46 - 09:56:46 3532
George/Umatilla 09:41:18 -57.0 Dark Down 30.7 146.5 Up 09:26:18 - 09:56:18 3530
Pasco 09:41:16 -56.7 Dark Down 30.5 146.8 Up 09:26:16 - 09:56:16 3529
North Lake 09:41:38 -59.4 Dark Down 32.3 144.0 Up 09:26:38 - 09:56:38 3524
PNWRO 09:41:16 -56.7 Dark Down 30.8 147.0 Up 09:26:16 - 09:56:16 3513
Tulelake 09:41:46 -60.5 Dark Down 33.1 142.9 Up 09:26:46 - 09:56:46 3512
Paisley 09:41:39 -59.5 Dark Down 32.9 144.1 Up 09:26:39 - 09:56:39 3493
Fall River/Burney 09:41:51 -60.9 Dark Down 33.8 142.6 Up 09:26:51 - 09:56:51 3481
Lakeview 09:41:41 -59.7 Dark Down 33.4 144.2 Up 09:26:41 - 09:56:41 3470
Cedarville 09:41:43 -59.9 Dark Down 34.0 144.1 Up 09:26:43 - 09:56:43 3442
Greenville 09:41:53 -61.1 Dark Down 34.8 142.8 Up 09:26:53 - 09:56:53 3432
Gimple 09:41:53 -61.0 Dark Down 34.8 142.8 Up 09:26:53 - 09:56:53 3428
Susanville 09:41:51 -60.8 Dark Down 34.7 143.2 Up 09:26:51 - 09:56:51 3428
Quincy 09:41:54 -61.2 Dark Down 34.9 142.7 Up 09:26:54 - 09:56:54 3425
Portola 09:41:53 -60.9 Dark Down 35.3 143.1 Up 09:26:53 - 09:56:53 3399
Reno 09:41:52 -60.6 Dark Down 35.8 143.7 Up 09:26:52 - 09:56:52 3361
Carson City 09:41:54 -60.8 Dark Down 36.1 143.6 Up 09:26:54 - 09:56:54 3347
Gardnerville 09:41:55 -60.8 Dark Down 36.3 143.5 Up 09:26:55 - 09:56:55 3337
Yerington 09:41:52 -60.4 Dark Down 36.5 144.2 Up 09:26:52 - 09:56:52 3311
Lee Vining 09:41:57 -60.8 Dark Down 37.4 143.8 Up 09:26:57 - 09:56:57 3272
Hawthorne 09:41:52 -60.2 Dark Down 37.1 144.6 Up 09:26:52 - 09:56:52 3270
CPSLO 09:42:18 -62.9 Dark Down 38.8 140.9 Up 09:27:18 - 09:57:18 3241
Bishop 09:41:57 -60.5 Dark Down 38.2 144.3 Up 09:26:57 - 09:56:57 3215
Tonopah 09:41:49 -59.4 Dark Down 38.1 145.9 Up 09:26:49 - 09:56:49 3185
Lone Pine 09:42:00 -60.5 Dark Down 39.0 144.4 Up 09:27:00 - 09:57:00 3168
Beatty 09:41:53 -59.5 Dark Down 39.3 146.0 Up 09:26:53 - 09:56:53 3117
Wildwood 09:42:14 -61.7 Dark Down 40.8 142.6 Up 09:27:14 - 09:57:14 3090
Indian Springs 09:41:50 -58.8 Dark Down 40.1 147.0 Up 09:26:50 - 09:56:50 3051
Henderson 09:41:49 -58.4 Dark Down 40.8 147.6 Up 09:26:49 - 09:56:49 2993
Idyllwild 09:42:08 -60.3 Dark Down 42.0 144.5 Up 09:27:08 - 09:57:08 2979
Searchlight/Boulder City 09:41:52 -58.5 Dark Down 41.3 147.4 Up 09:26:52 - 09:56:52 2965
Laughlin/Bullhead City 09:41:52 -58.3 Dark Down 41.7 147.7 Up 09:26:52 - 09:56:52 2934
Mohave Valley 09:41:53 -58.4 Dark Down 42.0 147.6 Up 09:26:53 - 09:56:53 2922
Patrick 09:41:48 -57.7 Dark Down 41.8 148.6 Up 09:26:48 - 09:56:48 2909
Kingman/Dolan Springs 09:41:50 -57.9 Dark Down 41.9 148.3 Up 09:26:50 - 09:56:50 2909
Lake Havasu City 09:41:54 -58.2 Dark Down 42.4 147.7 Up 09:26:54 - 09:56:54 2891
Calipatria 09:42:07 -59.5 Dark Down 43.0 145.6 Up 09:27:07 - 09:57:07 2890
Parker 09:41:56 -58.3 Dark Down 42.7 147.5 Up 09:26:56 - 09:56:56 2873
Blythe 09:42:00 -58.6 Dark Down 43.0 146.9 Up 09:27:00 - 09:57:00 2865
DCO 09:41:46 -57.2 Dark Down 42.4 149.3 Up 09:26:46 - 09:56:46 2858
Yuma 09:42:04 -58.8 Dark Down 43.8 146.4 Up 09:27:04 - 09:57:04 2823
SwRI 09:40:50 -50.2 Dark Down 40.5 160.7 Up 09:25:50 - 09:55:50 2665
Niwot 09:40:50 -50.1 Dark Down 40.4 160.9 Up 09:25:50 - 09:55:50 2664

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, (2024/12/04 09:43UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:08.1 -16:43:21 -1.5 27.92 135
Alphard        09:27:35.2 -08:39:31  2.0 13.48 134
3 Hya          08:35:28.2 -07:58:56  6.2  0.66 142
PPM 191455     08:33:22.5 -07:54:51  8.3  0.31 142
PPM 191452     08:33:15.1 -07:44:52  9.4  0.15 142
281371         08:33:18.3 -07:36:03 15.2       142
Positions are for J2000

Event circumstances last updated at 2019/06/08 09:35:49 UT

Marc W. Buie, Southwest Research Institute

RECON