RECON: TNO occultation with 11QF99

Event between 11QF99 and star GA1040:01852147 with event index number of 2124261

Geocentric closest approach at 2025/11/21 12:32:56 UTC

J2000 position of star is 06:24:47.9 +14:23:01
Equinox of date position of star is 06:26:04.0 +14:22:11
Stellar brightness G=14.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 153 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 16.8 AU from the Sun and 16.0 AU from the Earth.
The TNO is moving 17.1 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 536 seconds.
The 1-sigma cross-track error in the shadow position is 2416 km.
The sky-plane scale is 11620.3 km/arcsec.

The TNO has an absolute magnitude Hv=9.8
Diameter=66.4 km assuming a 5% albedo -- 3.9 sec chord
Diameter=27.1 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 11QF99, (2025/11/21 12:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:34.4 +07:24:35  0.4 10.07 154
Alhena         06:39:12.4 +16:22:30  1.9  3.71 151
PPM 122497     06:28:44.6 +14:52:18  6.2  0.78 153
PPM 122428     06:26:24.5 +14:23:27  8.3  0.04 153
11QF99         06:26:16.4 +14:22:03 14.8       153
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 1.7 sigma about the mid-time.
The median site spacing is 29.5 km RECON observability=1.0 and success probability=12.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 12:29:32 -18.7 Dark Down 37.5 241.5 Up 12:14:32 - 12:44:32 4651
Kamloops 12:30:16 -27.5 Dark Down 45.6 226.8 Up 12:15:16 - 12:45:16 4500
Kelowna 12:30:11 -26.9 Dark Down 45.7 228.4 Up 12:15:11 - 12:45:11 4423
Peachland 12:30:13 -27.1 Dark Down 45.9 228.2 Up 12:15:13 - 12:45:13 4413
Summerland 12:30:12 -27.1 Dark Down 46.0 228.4 Up 12:15:12 - 12:45:12 4399
Penticton 12:30:11 -27.0 Dark Down 46.0 228.6 Up 12:15:11 - 12:45:11 4392
Oliver 12:30:11 -27.0 Dark Down 46.2 228.8 Up 12:15:11 - 12:45:11 4359
Anarchist Mountain Observatory 12:30:09 -26.9 Dark Down 46.2 229.2 Up 12:15:09 - 12:45:09 4343
Tonasket 12:30:09 -26.9 Dark Down 46.5 229.4 Up 12:15:09 - 12:45:09 4314
Victoria 12:30:24 -29.5 Dark Down 48.5 224.6 Up 12:15:24 - 12:45:24 4302
Okanogan 12:30:09 -27.0 Dark Down 46.7 229.5 Up 12:15:09 - 12:45:09 4282
Brewster 12:30:09 -27.2 Dark Down 47.0 229.4 Up 12:15:09 - 12:45:09 4256
Manson/Chelan 12:30:11 -27.4 Dark Down 47.3 229.2 Up 12:15:11 - 12:45:11 4237
Wenatchee 12:30:11 -27.5 Dark Down 47.7 229.3 Up 12:15:11 - 12:45:11 4191
Ellensburg 12:30:10 -27.7 Dark Down 48.1 229.4 Up 12:15:10 - 12:45:10 4152
Yakima 12:30:10 -27.7 Dark Down 48.4 229.7 Up 12:15:10 - 12:45:10 4112
Toppenish/White Swan 12:30:09 -27.6 Dark Down 48.5 230.1 Up 12:15:09 - 12:45:09 4091
PNWRO 12:30:03 -26.5 Dark Down 47.9 232.2 Up 12:15:03 - 12:45:03 4054
Goldendale 12:30:10 -27.8 Dark Down 49.0 230.1 Up 12:15:10 - 12:45:10 4038
The Dalles 12:30:11 -28.1 Dark Down 49.4 229.9 Up 12:15:11 - 12:45:11 4016
Maupin 12:30:10 -28.0 Dark Down 49.6 230.4 Up 12:15:10 - 12:45:10 3975
Sisters 12:30:11 -28.4 Dark Down 50.4 230.6 Up 12:15:11 - 12:45:11 3890
Bend 12:30:09 -28.2 Dark Down 50.4 231.1 Up 12:15:09 - 12:45:09 3866
Oregon Observatory 12:30:10 -28.3 Dark Down 50.6 231.1 Up 12:15:10 - 12:45:10 3849
North Lake 12:30:07 -27.8 Dark Down 50.7 232.4 Up 12:15:07 - 12:45:07 3784
Chiloquin 12:30:10 -28.5 Dark Down 51.7 231.9 Up 12:15:10 - 12:45:10 3718
Klamath Falls 12:30:09 -28.5 Dark Down 51.8 232.3 Up 12:15:09 - 12:45:09 3683
Lakeview 12:30:03 -27.4 Dark Down 51.0 234.1 Up 12:15:03 - 12:45:03 3677
Cedarville 12:30:01 -27.2 Dark Down 51.3 234.9 Up 12:15:01 - 12:45:01 3611
Fall River/Burney 12:30:06 -28.1 Dark Down 52.3 234.0 Up 12:15:06 - 12:45:06 3564
Dunrhomin 12:29:02 -16.0 AT Down 41.9 251.2 Up 12:14:02 - 12:44:02 3511
Susanville 12:30:02 -27.5 Dark Down 52.2 235.5 Up 12:15:02 - 12:45:02 3498
CU-SBO 12:29:01 -16.1 AT Down 42.1 251.3 Up 12:14:01 - 12:44:01 3485
Greenville 12:30:03 -27.7 Dark Down 52.6 235.5 Up 12:15:03 - 12:45:03 3470
Gimple 12:30:03 -27.7 Dark Down 52.5 235.6 Up 12:15:03 - 12:45:03 3470
Quincy 12:30:03 -27.7 Dark Down 52.7 235.7 Up 12:15:03 - 12:45:03 3450
Portola 12:30:01 -27.4 Dark Down 52.5 236.4 Up 12:15:01 - 12:45:01 3436
Reno 12:29:58 -26.9 Dark Down 52.2 237.4 Up 12:14:58 - 12:44:58 3408
Carson City 12:29:57 -26.8 Dark Down 52.4 237.8 Up 12:14:57 - 12:44:57 3371
Yerington 12:29:54 -26.3 Dark Down 52.1 238.8 Up 12:14:54 - 12:44:54 3350
Gardnerville 12:29:57 -26.8 Dark Down 52.5 238.2 Up 12:14:57 - 12:44:57 3346
Hawthorne 12:29:51 -25.9 Dark Down 51.9 239.9 Up 12:14:51 - 12:44:51 3302
Tonopah 12:29:44 -24.7 Dark Down 51.2 241.9 Up 12:14:44 - 12:44:44 3253
Lee Vining 12:29:52 -26.2 Dark Down 52.6 240.0 Up 12:14:52 - 12:44:52 3244
Bishop 12:29:49 -25.6 Dark Down 52.4 241.4 Up 12:14:49 - 12:44:49 3181
Beatty 12:29:41 -24.2 Dark Down 51.4 243.7 Up 12:14:41 - 12:44:41 3133
Indian Springs 12:29:36 -23.3 Dark Down 50.8 245.1 Up 12:14:36 - 12:44:36 3099
Henderson 12:29:33 -22.7 Dark Down 50.5 246.4 Up 12:14:33 - 12:44:33 3043
Patrick 12:29:27 -21.7 Dark Down 50.0 248.1 Up 12:14:27 - 12:44:27 2979
Kingman/Dolan Springs 12:29:27 -21.9 Dark Down 50.2 248.2 Up 12:14:27 - 12:44:27 2955
Laughlin/Bullhead City 12:29:30 -22.3 Dark Down 50.6 247.8 Up 12:14:30 - 12:44:30 2952
Mohave Valley 12:29:30 -22.2 Dark Down 50.7 248.1 Up 12:14:30 - 12:44:30 2923
Lake Havasu City 12:29:28 -22.0 Dark Down 50.6 248.8 Up 12:14:28 - 12:44:28 2881
Parker 12:29:28 -21.9 Dark Down 50.7 249.2 Up 12:14:28 - 12:44:28 2844
Wildwood 12:29:46 -25.3 Dark Down 54.0 245.1 Up 12:14:46 - 12:44:46 2837
George/Scottsdale 12:29:16 -19.8 Dark Down 49.0 251.8 Up 12:14:16 - 12:44:16 2803
Idyllwild 12:29:38 -23.8 Dark Down 52.7 247.4 Up 12:14:38 - 12:44:38 2799
Calipatria 12:29:32 -22.7 Dark Down 52.0 249.2 Up 12:14:32 - 12:44:32 2734
Yuma 12:29:27 -21.9 Dark Down 51.5 250.6 Up 12:14:27 - 12:44:27 2689

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 11QF99, (2025/11/21 12:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 10.07 154
Alhena         06:37:42.8 +16:23:57  1.9  3.71 151
PPM 122497     06:27:15.8 +14:53:21  6.2  0.78 153
PPM 122428     06:24:56.1 +14:24:25  8.3  0.04 153
11QF99         06:24:47.9 +14:23:01 14.8       153
Positions are for J2000

Event circumstances last updated at 2022/04/11 23:04:52 UT

Marc W. Buie, Southwest Research Institute

RECON