RECON: TNO occultation with 11QF99

Event between 11QF99 and star GA1040:01852147 with event index number of 1491297

Geocentric closest approach at 2025/11/21 12:29:46 UTC

J2000 position of star is 06:24:47.9 +14:23:01
Equinox of date position of star is 06:25:54.3 +14:22:18
Stellar brightness G=14.8, use SENSEUP=128
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 567 seconds.
The 1-sigma cross-track error in the shadow position is 2256 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 12:30UT)
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 1.6 sigma about the mid-time.
The median site spacing is 21.2 km RECON observability=1.0 and success probability=16.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 12:27:04 -27.4 Dark Down 46.0 227.6 Up 12:12:04 - 12:42:04 3216
Summerland 12:27:04 -27.6 Dark Down 46.3 227.4 Up 12:12:04 - 12:42:04 3189
Penticton 12:27:04 -27.5 Dark Down 46.3 227.6 Up 12:12:04 - 12:42:04 3182
Okanagan Falls 12:27:04 -27.5 Dark Down 46.5 227.7 Up 12:12:04 - 12:42:04 3164
Oliver 12:27:04 -27.5 Dark Down 46.6 227.9 Up 12:12:04 - 12:42:04 3149
Anarchist Mountain Observatory 12:27:02 -27.4 Dark Down 46.6 228.3 Up 12:12:02 - 12:42:02 3132
Oroville 12:27:03 -27.4 Dark Down 46.7 228.2 Up 12:12:03 - 12:42:03 3126
Tonasket 12:27:02 -27.4 Dark Down 46.8 228.4 Up 12:12:02 - 12:42:02 3103
Okanogan 12:27:02 -27.5 Dark Down 47.1 228.5 Up 12:12:02 - 12:42:02 3072
Brewster 12:27:03 -27.7 Dark Down 47.4 228.5 Up 12:12:03 - 12:42:03 3046
Manson/Chelan 12:27:04 -27.9 Dark Down 47.7 228.2 Up 12:12:04 - 12:42:04 3027
Entiat 12:27:04 -28.0 Dark Down 47.9 228.3 Up 12:12:04 - 12:42:04 3006
Wenatchee 12:27:03 -28.0 Dark Down 48.1 228.4 Up 12:12:03 - 12:42:03 2981
Ellensburg 12:27:04 -28.2 Dark Down 48.5 228.5 Up 12:12:04 - 12:42:04 2942
Yakima 12:27:03 -28.2 Dark Down 48.8 228.8 Up 12:12:03 - 12:42:03 2903
Toppenish/White Swan 12:27:02 -28.1 Dark Down 48.9 229.2 Up 12:12:02 - 12:42:02 2881
Pasco 12:26:57 -27.2 Dark Down 48.3 230.8 Up 12:11:57 - 12:41:57 2868
PNWRO 12:26:56 -27.1 Dark Down 48.3 231.3 Up 12:11:56 - 12:41:56 2844
George/Umatilla 12:26:57 -27.4 Dark Down 48.6 230.8 Up 12:11:57 - 12:41:57 2836
Goldendale 12:27:03 -28.4 Dark Down 49.4 229.1 Up 12:12:03 - 12:42:03 2828
The Dalles 12:27:04 -28.6 Dark Down 49.8 228.9 Up 12:12:04 - 12:42:04 2807
Maupin 12:27:03 -28.6 Dark Down 50.0 229.4 Up 12:12:03 - 12:42:03 2766
Madras/Culver 12:27:03 -28.6 Dark Down 50.4 229.8 Up 12:12:03 - 12:42:03 2712
Sisters 12:27:04 -28.9 Dark Down 50.8 229.6 Up 12:12:04 - 12:42:04 2680
Redmond 12:27:02 -28.6 Dark Down 50.6 230.1 Up 12:12:02 - 12:42:02 2677
Bend 12:27:03 -28.7 Dark Down 50.9 230.1 Up 12:12:03 - 12:42:03 2656
Oregon Observatory 12:27:03 -28.8 Dark Down 51.0 230.1 Up 12:12:03 - 12:42:03 2639
La Pine/Gilchrist 12:27:03 -28.9 Dark Down 51.2 230.2 Up 12:12:03 - 12:42:03 2619
North Lake 12:27:00 -28.4 Dark Down 51.1 231.4 Up 12:12:00 - 12:42:00 2574
Paisley 12:26:58 -28.1 Dark Down 51.3 232.4 Up 12:11:58 - 12:41:58 2518
Chiloquin 12:27:03 -29.1 Dark Down 52.1 230.9 Up 12:12:03 - 12:42:03 2508
Klamath Falls 12:27:02 -29.0 Dark Down 52.3 231.3 Up 12:12:02 - 12:42:02 2474
Lakeview 12:26:56 -28.0 Dark Down 51.5 233.1 Up 12:11:56 - 12:41:56 2467
Tulelake 12:27:01 -28.8 Dark Down 52.3 232.0 Up 12:12:01 - 12:42:01 2446
Cedarville 12:26:55 -27.8 Dark Down 51.8 234.0 Up 12:11:55 - 12:41:55 2401
Fall River/Burney 12:26:59 -28.7 Dark Down 52.8 233.0 Up 12:11:59 - 12:41:59 2354
Susanville 12:26:56 -28.1 Dark Down 52.7 234.6 Up 12:11:56 - 12:41:56 2288
Niwot 12:25:54 -16.6 AT Down 42.5 250.6 Up 12:10:54 - 12:40:54 2280
SwRI 12:25:54 -16.6 AT Down 42.6 250.6 Up 12:10:54 - 12:40:54 2269
Greenville 12:26:56 -28.3 Dark Down 53.1 234.5 Up 12:11:56 - 12:41:56 2261
Gimple 12:26:56 -28.3 Dark Down 53.0 234.6 Up 12:11:56 - 12:41:56 2260
Quincy 12:26:56 -28.3 Dark Down 53.2 234.7 Up 12:11:56 - 12:41:56 2240
Portola 12:26:54 -28.0 Dark Down 52.9 235.4 Up 12:11:54 - 12:41:54 2226
Reno 12:26:51 -27.4 Dark Down 52.7 236.5 Up 12:11:51 - 12:41:51 2198
Carson City 12:26:50 -27.4 Dark Down 52.9 236.9 Up 12:11:50 - 12:41:50 2161
Yerington 12:26:47 -26.9 Dark Down 52.6 237.9 Up 12:11:47 - 12:41:47 2140
Gardnerville 12:26:50 -27.4 Dark Down 53.0 237.2 Up 12:11:50 - 12:41:50 2136
Hawthorne 12:26:45 -26.5 Dark Down 52.5 239.0 Up 12:11:45 - 12:41:45 2091
Tonopah 12:26:38 -25.3 Dark Down 51.8 241.1 Up 12:11:38 - 12:41:38 2042
Lee Vining 12:26:46 -26.8 Dark Down 53.1 239.1 Up 12:11:46 - 12:41:46 2033
Bishop 12:26:42 -26.2 Dark Down 52.9 240.6 Up 12:11:42 - 12:41:42 1971
Beatty 12:26:34 -24.9 Dark Down 52.0 242.8 Up 12:11:34 - 12:41:34 1921
Lone Pine 12:26:40 -25.8 Dark Down 53.0 241.8 Up 12:11:40 - 12:41:40 1891
Indian Springs 12:26:30 -24.0 Dark Down 51.4 244.3 Up 12:11:30 - 12:41:30 1887
Henderson 12:26:26 -23.3 Dark Down 51.1 245.6 Up 12:11:26 - 12:41:26 1832
Searchlight/Boulder City 12:26:25 -23.2 Dark Down 51.3 246.3 Up 12:11:25 - 12:41:25 1771
Patrick 12:26:20 -22.4 Dark Down 50.5 247.4 Up 12:11:20 - 12:41:20 1767
CPSLO 12:26:50 -27.8 Dark Down 55.5 240.5 Up 12:11:50 - 12:41:50 1758
Kingman/Dolan Springs 12:26:21 -22.5 Dark Down 50.8 247.5 Up 12:11:21 - 12:41:21 1743
Laughlin/Bullhead City 12:26:23 -22.9 Dark Down 51.2 247.0 Up 12:11:23 - 12:41:23 1740
DCO 12:26:17 -21.8 Dark Down 50.1 248.4 Up 12:11:17 - 12:41:17 1735
Mohave Valley 12:26:23 -22.8 Dark Down 51.3 247.3 Up 12:11:23 - 12:41:23 1711
Lake Havasu City 12:26:21 -22.6 Dark Down 51.2 248.0 Up 12:11:21 - 12:41:21 1669
Parker 12:26:21 -22.5 Dark Down 51.3 248.5 Up 12:11:21 - 12:41:21 1632
Wildwood 12:26:40 -26.0 Dark Down 54.6 244.3 Up 12:11:40 - 12:41:40 1627
Idyllwild 12:26:31 -24.4 Dark Down 53.3 246.6 Up 12:11:31 - 12:41:31 1588
Blythe 12:26:21 -22.7 Dark Down 51.8 248.8 Up 12:11:21 - 12:41:21 1576
Calipatria 12:26:26 -23.3 Dark Down 52.7 248.5 Up 12:11:26 - 12:41:26 1523
Yuma 12:26:21 -22.5 Dark Down 52.1 249.9 Up 12:11:21 - 12:41:21 1477

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 12:30UT)
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 2019/06/08 13:10:44 UT

Marc W. Buie, Southwest Research Institute

RECON