RECON: TNO occultation with 123509

Event between (123509) 00WK183 and star GA1100:02095466 with event index number of 1470766

Geocentric closest approach at 2026/02/05 07:59:20 UTC

J2000 position of star is 06:28:05.1 +21:16:33
Equinox of date position of star is 06:29:14.9 +21:15:44
Stellar brightness G=15.2, use SENSEUP=128
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 41.7 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 667 seconds.
The 1-sigma cross-track error in the shadow position is 2264 km.
The sky-plane scale is 30279.3 km/arcsec.

The TNO has an absolute magnitude Hv=6.5
Diameter=288.4 km assuming a 5% albedo -- 16.1 sec chord
Diameter=117.7 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 123509, (2026/02/05 07:59UT)
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  83
PPM 096021     06:29:43.0 +21:08:20  7.9  0.12  83
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 1.3 sigma about the mid-time.
The median site spacing is 19.0 km RECON observability=1.0 and success probability=16.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:57:20 -55.9 Dark Up 48.4 240.7 Up 07:42:20 - 08:12:20 2101
Summerland 07:57:20 -56.1 Dark Up 48.7 240.7 Up 07:42:20 - 08:12:20 2069
Penticton 07:57:20 -56.2 Dark Up 48.7 240.9 Up 07:42:20 - 08:12:20 2066
Okanagan Falls 07:57:19 -56.4 Dark Up 48.8 241.0 Up 07:42:19 - 08:12:19 2049
Oliver 07:57:19 -56.6 Dark Up 48.9 241.2 Up 07:42:19 - 08:12:19 2035
Anarchist Mountain Observatory 07:57:18 -56.8 Dark Up 48.8 241.6 Up 07:42:18 - 08:12:18 2024
Oroville 07:57:18 -56.8 Dark Up 48.9 241.6 Up 07:42:18 - 08:12:18 2016
Tonasket 07:57:17 -57.1 Dark Up 49.0 241.8 Up 07:42:17 - 08:12:17 1996
Okanogan 07:57:16 -57.4 Dark Up 49.3 242.0 Up 07:42:16 - 08:12:16 1963
Brewster 07:57:16 -57.6 Dark Up 49.5 242.1 Up 07:42:16 - 08:12:16 1935
Manson/Chelan 07:57:16 -57.8 Dark Up 49.8 241.9 Up 07:42:16 - 08:12:16 1908
Entiat 07:57:16 -58.0 Dark Up 50.0 242.0 Up 07:42:16 - 08:12:16 1887
Wenatchee 07:57:15 -58.3 Dark Up 50.2 242.2 Up 07:42:15 - 08:12:15 1862
Ellensburg 07:57:15 -58.6 Dark Up 50.5 242.4 Up 07:42:15 - 08:12:15 1821
Pasco 07:57:08 -59.5 Dark Up 50.0 244.7 Up 07:42:08 - 08:12:08 1785
Yakima 07:57:14 -59.0 Dark Up 50.7 242.8 Up 07:42:14 - 08:12:14 1784
Toppenish/White Swan 07:57:12 -59.3 Dark Up 50.7 243.2 Up 07:42:12 - 08:12:12 1768
PNWRO 07:57:07 -59.8 Dark Up 49.9 245.2 Up 07:42:07 - 08:12:07 1767
George/Umatilla 07:57:08 -59.8 Dark Up 50.2 244.8 Up 07:42:08 - 08:12:08 1749
Goldendale 07:57:12 -59.8 Dark Up 51.2 243.3 Up 07:42:12 - 08:12:12 1708
The Dalles 07:57:13 -59.9 Dark Up 51.5 243.2 Up 07:42:13 - 08:12:13 1680
Maupin 07:57:11 -60.4 Dark Up 51.6 243.8 Up 07:42:11 - 08:12:11 1643
Madras/Culver 07:57:10 -60.9 Dark Up 51.9 244.3 Up 07:42:10 - 08:12:10 1592
Niwot 07:56:08 -64.1 Dark Up 42.0 263.1 Up 07:41:08 - 08:11:08 1585
SwRI 07:56:08 -64.3 Dark Up 42.1 263.1 Up 07:41:08 - 08:11:08 1573
Redmond 07:57:09 -61.3 Dark Up 52.1 244.7 Up 07:42:09 - 08:12:09 1558
Sisters 07:57:11 -61.2 Dark Up 52.3 244.2 Up 07:42:11 - 08:12:11 1551
Bend 07:57:09 -61.4 Dark Up 52.3 244.8 Up 07:42:09 - 08:12:09 1535
Oregon Observatory 07:57:09 -61.6 Dark Up 52.4 244.8 Up 07:42:09 - 08:12:09 1516
La Pine/Gilchrist 07:57:09 -61.8 Dark Up 52.6 245.0 Up 07:42:09 - 08:12:09 1495
North Lake 07:57:06 -62.3 Dark Up 52.4 246.2 Up 07:42:06 - 08:12:06 1468
Paisley 07:57:03 -62.9 Dark Up 52.3 247.2 Up 07:42:03 - 08:12:03 1425
Chiloquin 07:57:07 -62.8 Dark Up 53.3 246.0 Up 07:42:07 - 08:12:07 1383
Lakeview 07:57:01 -63.4 Dark Up 52.4 248.0 Up 07:42:01 - 08:12:01 1381
Klamath Falls 07:57:05 -63.2 Dark Up 53.4 246.5 Up 07:42:05 - 08:12:05 1352
Tulelake 07:57:04 -63.5 Dark Up 53.3 247.1 Up 07:42:04 - 08:12:04 1333
Cedarville 07:56:58 -64.1 Dark Up 52.5 249.0 Up 07:41:58 - 08:11:58 1324
Fall River/Burney 07:57:01 -64.4 Dark Up 53.6 248.3 Up 07:42:01 - 08:12:01 1249
Susanville 07:56:57 -65.1 Dark Up 53.3 249.9 Up 07:41:57 - 08:11:57 1206
Gimple 07:56:57 -65.3 Dark Up 53.5 250.0 Up 07:41:57 - 08:11:57 1174
Greenville 07:56:57 -65.3 Dark Up 53.6 249.9 Up 07:41:57 - 08:11:57 1172
Quincy 07:56:56 -65.5 Dark Up 53.6 250.2 Up 07:41:56 - 08:11:56 1153
Portola 07:56:54 -65.7 Dark Up 53.4 250.8 Up 07:41:54 - 08:11:54 1152
Reno 07:56:52 -66.1 Dark Up 53.0 251.7 Up 07:41:52 - 08:11:52 1142
Carson City 07:56:50 -66.4 Dark Up 53.1 252.2 Up 07:41:50 - 08:11:50 1108
Yerington 07:56:48 -66.7 Dark Up 52.7 253.0 Up 07:41:48 - 08:11:48 1105
Gardnerville 07:56:50 -66.7 Dark Up 53.1 252.6 Up 07:41:50 - 08:11:50 1086
Hawthorne 07:56:45 -67.2 Dark Up 52.4 254.1 Up 07:41:45 - 08:11:45 1074
Tonopah 07:56:39 -67.8 Dark Up 51.5 255.9 Up 07:41:39 - 08:11:39 1065
Lee Vining 07:56:45 -67.7 Dark Up 52.9 254.4 Up 07:41:45 - 08:11:45 1006
Bishop 07:56:41 -68.4 Dark Up 52.5 255.8 Up 07:41:41 - 08:11:41 967
Beatty 07:56:34 -69.0 Dark Up 51.4 257.7 Up 07:41:34 - 08:11:34 964
Indian Springs 07:56:29 -69.3 Dark Up 50.6 258.9 Up 07:41:29 - 08:11:29 961
Henderson 07:56:26 -69.8 Dark Up 50.2 260.1 Up 07:41:26 - 08:11:26 928
Lone Pine 07:56:37 -69.2 Dark Up 52.5 257.0 Up 07:41:37 - 08:11:37 901
Patrick 07:56:20 -70.4 Dark Up 49.4 261.6 Up 07:41:20 - 08:11:20 898
DCO 07:56:17 -70.7 Dark Up 48.9 262.5 Up 07:41:17 - 08:11:17 888
Searchlight/Boulder City 07:56:24 -70.4 Dark Up 50.2 260.8 Up 07:41:24 - 08:11:24 874
Kingman/Dolan Springs 07:56:20 -70.6 Dark Up 49.6 261.7 Up 07:41:20 - 08:11:20 871
Laughlin/Bullhead City 07:56:22 -70.7 Dark Up 50.0 261.4 Up 07:41:22 - 08:11:22 854
Mohave Valley 07:56:21 -71.0 Dark Up 50.1 261.7 Up 07:41:21 - 08:11:21 828
Lake Havasu City 07:56:19 -71.4 Dark Up 49.9 262.4 Up 07:41:19 - 08:11:19 795
Parker 07:56:18 -71.7 Dark Up 49.9 262.8 Up 07:41:18 - 08:11:18 762
CPSLO 07:56:43 -70.1 Dark Up 54.8 256.5 Up 07:41:43 - 08:11:43 706
Blythe 07:56:18 -72.2 Dark Up 50.3 263.2 Up 07:41:18 - 08:11:18 702
Idyllwild 07:56:25 -72.1 Dark Up 52.0 261.6 Up 07:41:25 - 08:11:25 654
Wildwood 07:56:33 -71.6 Dark Up 53.4 259.8 Up 07:41:33 - 08:11:33 639
Calipatria 07:56:19 -72.8 Dark Up 51.1 263.2 Up 07:41:19 - 08:11:19 626
Yuma 07:56:15 -73.2 Dark Up 50.4 264.3 Up 07:41:15 - 08:11:15 609

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 07:59UT)
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  83
PPM 096021     06:28:09.4 +21:09:26  7.9  0.12  83
123509         06:28:05.1 +21:16:33 15.2        83
Positions are for J2000

Event circumstances last updated at 2019/06/08 22:31:41 UT

Marc W. Buie, Southwest Research Institute

RECON