RECON: TNO occultation with 127871

Event between (127871) 03FC128 and star GA0800:04401701 with event index number of 1470902

Geocentric closest approach at 2026/04/05 09:08:56 UTC

J2000 position of star is 13:38:59.1 -08:11:55
Equinox of date position of star is 13:40:08.7 -08:18:35
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 28 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 34.6 AU from the Sun and 33.6 AU from the Earth.
The TNO is moving 24.1 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 148 seconds.
The 1-sigma cross-track error in the shadow position is 2550 km.
The sky-plane scale is 24399.3 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=198.6 km assuming a 5% albedo -- 8.2 sec chord
Diameter=81.1 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is 5:4E
 
 
 
 
 
 

Star training set for 127871, (2026/04/05 09:09UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:34.8 -11:17:51  1.0  4.51  29
82 Vir         13:42:59.7 -08:50:05  5.0  0.82  27
PPM 196700     13:38:58.0 -08:00:17  7.3  0.48  28
PPM 196747     13:41:40.0 -08:09:07  9.1  0.37  28
127871         13:40:22.0 -08:19:52 15.0        27
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 14.2 km RECON observability=1.0 and success probability=14.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 09:09:26 -26.1 Dark Up 27.2 202.8 Low 08:56:36 - 09:22:15 171
Kamloops 09:10:02 -31.4 Dark Up 30.9 187.0 Up 08:57:12 - 09:22:51 -215
Kelowna 09:09:58 -32.0 Dark Up 31.6 188.1 Up 08:57:09 - 09:22:48 -234
Peachland 09:09:59 -32.2 Dark Up 31.8 187.8 Up 08:57:10 - 09:22:49 -247
Summerland 09:09:59 -32.3 Dark Up 31.9 187.9 Up 08:57:09 - 09:22:48 -253
Penticton 09:09:58 -32.3 Dark Up 32.0 188.0 Up 08:57:09 - 09:22:48 -254
Oliver 09:09:58 -32.7 Dark Up 32.3 188.1 Up 08:57:08 - 09:22:47 -272
Anarchist Mountain Observatory 09:09:57 -32.8 Dark Up 32.5 188.3 Up 08:57:07 - 09:22:46 -276
Tonasket 09:09:57 -33.1 Dark Up 32.8 188.2 Up 08:57:07 - 09:22:46 -294
Okanogan 09:09:57 -33.4 Dark Up 33.1 188.1 Up 08:57:07 - 09:22:46 -316
Brewster 09:09:57 -33.7 Dark Up 33.4 187.9 Up 08:57:07 - 09:22:46 -336
Manson/Chelan 09:09:58 -34.0 Dark Up 33.6 187.5 Up 08:57:08 - 09:22:47 -357
Wenatchee 09:09:58 -34.5 Dark Up 34.1 187.3 Up 08:57:08 - 09:22:47 -387
Victoria 09:10:08 -34.1 Dark Up 33.2 183.6 Up 08:57:18 - 09:22:57 -406
Dunrhomin 09:09:00 -35.3 Dark Up 37.8 206.7 Up 08:56:10 - 09:21:49 -412
Ellensburg 09:09:58 -34.9 Dark Up 34.6 187.1 Up 08:57:08 - 09:22:47 -416
PNWRO 09:09:52 -35.5 Dark Up 35.4 189.1 Up 08:57:02 - 09:22:41 -429
Yakima 09:09:57 -35.3 Dark Up 35.0 187.1 Up 08:57:08 - 09:22:47 -439
Toppenish/White Swan 09:09:57 -35.5 Dark Up 35.2 187.3 Up 08:57:07 - 09:22:46 -447
Goldendale 09:09:57 -36.1 Dark Up 35.7 186.8 Up 08:57:08 - 09:22:47 -490
The Dalles 09:09:58 -36.4 Dark Up 36.0 186.4 Up 08:57:08 - 09:22:47 -514
Maupin 09:09:57 -36.8 Dark Up 36.4 186.6 Up 08:57:08 - 09:22:47 -535
Sisters 09:09:58 -37.7 Dark Up 37.3 186.0 Up 08:57:08 - 09:22:47 -601
Bend 09:09:56 -37.9 Dark Up 37.5 186.4 Up 08:57:07 - 09:22:46 -608
Oregon Observatory 09:09:57 -38.1 Dark Up 37.7 186.2 Up 08:57:07 - 09:22:46 -623
North Lake 09:09:54 -38.6 Dark Up 38.3 187.0 Up 08:57:05 - 09:22:44 -647
Lakeview 09:09:51 -39.4 Dark Up 39.3 187.8 Up 08:57:02 - 09:22:41 -697
Chiloquin 09:09:56 -39.4 Dark Up 39.1 185.8 Up 08:57:07 - 09:22:46 -717
Cedarville 09:09:50 -40.0 Dark Up 39.9 188.0 Up 08:57:00 - 09:22:39 -734
Klamath Falls 09:09:56 -39.7 Dark Up 39.4 186.0 Up 08:57:06 - 09:22:45 -736
Fall River/Burney 09:09:53 -40.7 Dark Up 40.5 186.5 Up 08:57:03 - 09:22:42 -801
Susanville 09:09:50 -41.1 Dark Up 41.1 187.6 Up 08:57:00 - 09:22:39 -821
Gimple 09:09:50 -41.5 Dark Up 41.4 187.3 Up 08:57:01 - 09:22:40 -846
Greenville 09:09:50 -41.5 Dark Up 41.4 187.2 Up 08:57:01 - 09:22:40 -848
Reno 09:09:46 -41.7 Dark Up 41.9 188.7 Up 08:56:56 - 09:22:35 -854
Portola 09:09:48 -41.6 Dark Up 41.7 187.9 Up 08:56:59 - 09:22:38 -855
Quincy 09:09:50 -41.7 Dark Up 41.6 187.2 Up 08:57:01 - 09:22:40 -861
Yerington 09:09:43 -42.0 Dark Up 42.3 189.7 Up 08:56:53 - 09:22:32 -872
Tonopah 09:09:35 -42.2 Dark Up 43.0 192.4 Up 08:56:46 - 09:22:25 -877
Carson City 09:09:45 -42.0 Dark Up 42.2 188.8 Up 08:56:56 - 09:22:35 -877
Hawthorne 09:09:40 -42.3 Dark Up 42.7 190.4 Up 08:56:51 - 09:22:30 -888
Gardnerville 09:09:45 -42.2 Dark Up 42.5 188.9 Up 08:56:55 - 09:22:34 -893
Indian Springs 09:09:27 -43.0 Dark Up 44.1 194.7 Up 08:56:38 - 09:22:17 -935
Lee Vining 09:09:41 -42.9 Dark Up 43.3 189.9 Up 08:56:52 - 09:22:31 -940
Beatty 09:09:32 -43.1 Dark Up 44.0 193.2 Up 08:56:42 - 09:22:21 -944
Henderson 09:09:24 -43.2 Dark Up 44.5 195.8 Up 08:56:35 - 09:22:14 -952
Bishop 09:09:38 -43.3 Dark Up 43.8 190.9 Up 08:56:49 - 09:22:28 -960
Patrick 09:09:19 -43.2 Dark Up 44.8 197.5 Up 08:56:30 - 09:22:09 -962
Kingman/Dolan Springs 09:09:20 -43.5 Dark Up 45.1 197.3 Up 08:56:30 - 09:22:09 -984
Laughlin/Bullhead City 09:09:21 -43.8 Dark Up 45.2 196.6 Up 08:56:32 - 09:22:11 -1001
Mohave Valley 09:09:21 -44.0 Dark Up 45.5 196.7 Up 08:56:31 - 09:22:10 -1020
George/Scottsdale 09:09:09 -43.8 Dark Up 45.9 200.7 Up 08:56:20 - 09:21:59 -1024
Lake Havasu City 09:09:19 -44.2 Dark Up 45.8 197.1 Up 08:56:30 - 09:22:09 -1041
Parker 09:09:19 -44.5 Dark Up 46.2 197.3 Up 08:56:29 - 09:22:08 -1066
Idyllwild 09:09:26 -45.9 Dark Up 47.1 194.0 Up 08:56:37 - 09:22:16 -1168
Calipatria 09:09:21 -45.9 Dark Up 47.4 195.8 Up 08:56:32 - 09:22:11 -1178
Yuma 09:09:17 -45.9 Dark Up 47.6 197.2 Up 08:56:28 - 09:22:07 -1182
Wildwood 09:09:34 -46.3 Dark Up 47.1 191.3 Up 08:56:44 - 09:22:23 -1201

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 127871, (2026/04/05 09:09UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  4.51  29
82 Vir         13:41:36.6 -08:42:10  5.0  0.82  27
PPM 196700     13:37:35.2 -07:52:18  7.3  0.48  28
PPM 196747     13:40:17.2 -08:01:10  9.1  0.37  28
127871         13:38:59.1 -08:11:55 15.0        28
Positions are for J2000

Event circumstances last updated at 2022/01/12 00:24:33 UT

Marc W. Buie, Southwest Research Institute

RECON