RECON: TNO occultation with 123509

Event between (123509) 00WK183 and star GA1100:02095466 with event index number of 2142507

Geocentric closest approach at 2026/02/05 07:57:08 UTC

J2000 position of star is 06:28:05.1 +21:16:33
Equinox of date position of star is 06:29:24.2 +21:15:37
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 83 degrees from the moon. Moon is 87% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 42.5 AU from the Sun and 41.8 AU from the Earth.
The TNO is moving 18.8 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 319 seconds.
The 1-sigma cross-track error in the shadow position is 2366 km.
The sky-plane scale is 30280.1 km/arcsec.

The TNO has an absolute magnitude Hv=6.5
Diameter=302.0 km assuming a 5% albedo -- 16.1 sec chord
Diameter=123.3 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 123509, (2026/02/05 07:56UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:35.1 +07:24:35  0.4 15.98  90
Alhena         06:39:13.1 +16:22:29  1.9  5.38  80
16 Gem         06:29:29.8 +20:28:41  6.1  0.78  82
PPM 096021     06:29:43.0 +21:08:20  7.9  0.12  82
123509         06:29:38.8 +21:15:27 15.2        82
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 27.5 km RECON observability=1.0 and success probability=9.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:54:44 -53.1 Dark Up 40.2 251.9 Up 07:39:44 - 08:09:44 -3432
Kamloops 07:55:17 -55.0 Dark Up 48.8 238.3 Up 07:40:17 - 08:10:17 -3858
Kelowna 07:55:11 -55.9 Dark Up 48.8 240.1 Up 07:40:11 - 08:10:11 -3910
Peachland 07:55:11 -55.9 Dark Up 49.0 239.8 Up 07:40:11 - 08:10:11 -3926
Summerland 07:55:11 -56.1 Dark Up 49.0 240.1 Up 07:40:11 - 08:10:11 -3937
Penticton 07:55:10 -56.2 Dark Up 49.0 240.3 Up 07:40:10 - 08:10:10 -3940
Oliver 07:55:09 -56.5 Dark Up 49.2 240.6 Up 07:40:09 - 08:10:09 -3971
Anarchist Mountain Observatory 07:55:08 -56.7 Dark Up 49.1 241.0 Up 07:40:08 - 08:10:08 -3982
Tonasket 07:55:07 -57.0 Dark Up 49.3 241.2 Up 07:40:07 - 08:10:07 -4011
Okanogan 07:55:07 -57.3 Dark Up 49.6 241.4 Up 07:40:07 - 08:10:07 -4044
Brewster 07:55:06 -57.6 Dark Up 49.8 241.5 Up 07:40:06 - 08:10:06 -4072
Manson/Chelan 07:55:08 -57.8 Dark Up 50.1 241.3 Up 07:40:08 - 08:10:08 -4098
Victoria 07:55:19 -56.7 Dark Up 51.7 236.8 Up 07:40:19 - 08:10:19 -4108
Wenatchee 07:55:06 -58.2 Dark Up 50.5 241.6 Up 07:40:06 - 08:10:06 -4144
Ellensburg 07:55:06 -58.6 Dark Up 50.8 241.8 Up 07:40:06 - 08:10:06 -4186
Yakima 07:55:05 -59.0 Dark Up 51.0 242.2 Up 07:40:05 - 08:10:05 -4223
Toppenish/White Swan 07:55:03 -59.2 Dark Up 51.0 242.6 Up 07:40:03 - 08:10:03 -4239
PNWRO 07:54:57 -59.7 Dark Up 50.3 244.6 Up 07:39:57 - 08:09:57 -4240
Goldendale 07:55:03 -59.7 Dark Up 51.5 242.7 Up 07:40:03 - 08:10:03 -4299
The Dalles 07:55:04 -59.9 Dark Up 51.9 242.6 Up 07:40:04 - 08:10:04 -4327
Maupin 07:55:02 -60.3 Dark Up 52.0 243.2 Up 07:40:02 - 08:10:02 -4363
Dunrhomin 07:54:00 -64.2 Dark Up 42.4 262.6 Up 07:39:00 - 08:09:00 -4412
Sisters 07:55:01 -61.1 Dark Up 52.7 243.6 Up 07:40:01 - 08:10:01 -4456
Bend 07:55:00 -61.4 Dark Up 52.6 244.2 Up 07:40:00 - 08:10:00 -4472
Oregon Observatory 07:55:00 -61.5 Dark Up 52.8 244.3 Up 07:40:00 - 08:10:00 -4491
North Lake 07:54:56 -62.2 Dark Up 52.7 245.6 Up 07:39:56 - 08:09:56 -4539
Chiloquin 07:54:58 -62.7 Dark Up 53.6 245.4 Up 07:39:58 - 08:09:58 -4624
Lakeview 07:54:51 -63.3 Dark Up 52.8 247.4 Up 07:39:51 - 08:09:51 -4626
Klamath Falls 07:54:57 -63.1 Dark Up 53.7 245.9 Up 07:39:57 - 08:09:57 -4655
Cedarville 07:54:49 -64.0 Dark Up 52.9 248.4 Up 07:39:49 - 08:09:49 -4684
Fall River/Burney 07:54:52 -64.3 Dark Up 53.9 247.8 Up 07:39:52 - 08:09:52 -4759
Susanville 07:54:48 -65.0 Dark Up 53.7 249.3 Up 07:39:48 - 08:09:48 -4802
Gimple 07:54:48 -65.3 Dark Up 53.9 249.5 Up 07:39:48 - 08:09:48 -4834
Greenville 07:54:49 -65.2 Dark Up 54.0 249.4 Up 07:39:49 - 08:09:49 -4835
Quincy 07:54:48 -65.4 Dark Up 54.0 249.6 Up 07:39:48 - 08:09:48 -4855
Portola 07:54:45 -65.6 Dark Up 53.7 250.3 Up 07:39:45 - 08:09:45 -4855
Reno 07:54:43 -66.0 Dark Up 53.4 251.2 Up 07:39:43 - 08:09:43 -4865
Carson City 07:54:41 -66.4 Dark Up 53.5 251.7 Up 07:39:41 - 08:09:41 -4900
Yerington 07:54:39 -66.6 Dark Up 53.1 252.5 Up 07:39:39 - 08:09:39 -4903
Gardnerville 07:54:41 -66.6 Dark Up 53.5 252.1 Up 07:39:41 - 08:09:41 -4922
Hawthorne 07:54:36 -67.2 Dark Up 52.8 253.6 Up 07:39:36 - 08:09:36 -4935
Tonopah 07:54:30 -67.8 Dark Up 51.9 255.4 Up 07:39:30 - 08:09:30 -4944
Lee Vining 07:54:36 -67.7 Dark Up 53.3 253.9 Up 07:39:36 - 08:09:36 -5002
Bishop 07:54:32 -68.3 Dark Up 53.0 255.3 Up 07:39:32 - 08:09:32 -5042
Beatty 07:54:25 -68.9 Dark Up 51.8 257.2 Up 07:39:25 - 08:09:25 -5045
Indian Springs 07:54:20 -69.3 Dark Up 51.1 258.5 Up 07:39:20 - 08:09:20 -5048
Henderson 07:54:16 -69.8 Dark Up 50.6 259.7 Up 07:39:16 - 08:09:16 -5082
Patrick 07:54:11 -70.4 Dark Up 49.9 261.2 Up 07:39:11 - 08:09:11 -5112
Kingman/Dolan Springs 07:54:12 -70.7 Dark Up 50.0 261.4 Up 07:39:12 - 08:09:12 -5139
Laughlin/Bullhead City 07:54:13 -70.7 Dark Up 50.5 261.0 Up 07:39:13 - 08:09:13 -5156
Mohave Valley 07:54:12 -71.0 Dark Up 50.5 261.3 Up 07:39:12 - 08:09:12 -5182
Lake Havasu City 07:54:10 -71.4 Dark Up 50.4 262.0 Up 07:39:10 - 08:09:10 -5215
George/Scottsdale 07:54:00 -71.9 Dark Up 48.5 264.5 Up 07:39:00 - 08:09:00 -5221
Parker 07:54:09 -71.7 Dark Up 50.4 262.4 Up 07:39:09 - 08:09:09 -5249
Idyllwild 07:54:17 -72.1 Dark Up 52.4 261.3 Up 07:39:17 - 08:09:17 -5355
Wildwood 07:54:25 -71.5 Dark Up 53.9 259.4 Up 07:39:25 - 08:09:25 -5371
Calipatria 07:54:11 -72.8 Dark Up 51.5 262.8 Up 07:39:11 - 08:09:11 -5384
Yuma 07:54:07 -73.2 Dark Up 50.8 264.0 Up 07:39:07 - 08:09:07 -5402

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 123509, (2026/02/05 07:56UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 15.98  90
Alhena         06:37:42.8 +16:23:57  1.9  5.38  80
16 Gem         06:27:56.7 +20:29:46  6.1  0.78  82
PPM 096021     06:28:09.4 +21:09:26  7.9  0.12  82
123509         06:28:05.1 +21:16:33 15.2        83
Positions are for J2000

Event circumstances last updated at 2022/01/10 23:23:33 UT

Marc W. Buie, Southwest Research Institute

RECON