RECON: TNO occultation with 15820

Event between (15820) 94TB and star GA1220:01521752 with event index number of 1643309

Geocentric closest approach at 2026/12/18 07:29:31 UTC

J2000 position of star is 05:11:38.2 +33:39:12
Equinox of date position of star is 05:13:06.2 +33:40:44
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 70 degrees from the moon. Moon is 61% illuminated.
TNO apparent brightness V=22.0

[RECON map]
TNO is 27.5 AU from the Sun and 26.5 AU from the Earth.
The TNO is moving 23.7 km/sec on the sky relative to the star, or, 4.4 arcsec/hr.
The 1-sigma error in the time of the event is 451 seconds.
The 1-sigma cross-track error in the shadow position is 1166 km.
The sky-plane scale is 19247.4 km/arcsec.

The TNO has an absolute magnitude Hv=7.6
Diameter=183.7 km assuming a 5% albedo -- 7.8 sec chord
Diameter=75.0 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 15820, (2026/12/18 07:30UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.2 +16:33:41  0.8 18.93  61
3Iot Aur       04:58:45.2 +33:12:22  2.7  3.09  67
14 Aur         05:17:09.9 +32:42:58  5.2  1.25  71
PPM 070028     05:13:55.4 +32:55:32  7.9  0.77  70
PPM 070018     05:13:14.4 +34:08:06 10.0  0.45  70
PPM 070027     05:13:43.5 +33:49:11 10.2  0.15  70
15820          05:13:24.6 +33:41:03 15.7        71
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 2.0 sigma about the mid-time.
The median site spacing is 29.9 km RECON observability=1.0 and success probability=14.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:28:36 -60.8 Dark Up 68.5 216.8 Up 07:13:36 - 07:43:36 -1649
Kamloops 07:29:18 -62.2 Dark Up 73.0 182.8 Up 07:14:18 - 07:44:18 -1735
Kelowna 07:29:15 -63.1 Dark Up 73.7 185.6 Up 07:14:15 - 07:44:15 -1829
Peachland 07:29:16 -63.1 Dark Up 73.9 184.7 Up 07:14:16 - 07:44:16 -1838
Summerland 07:29:16 -63.3 Dark Up 74.0 185.0 Up 07:14:16 - 07:44:16 -1855
Penticton 07:29:16 -63.4 Dark Up 74.1 185.4 Up 07:14:16 - 07:44:16 -1863
Oliver 07:29:16 -63.7 Dark Up 74.4 185.5 Up 07:14:16 - 07:44:16 -1900
Anarchist Mountain Observatory 07:29:16 -63.9 Dark Up 74.6 186.2 Up 07:14:16 - 07:44:16 -1920
Victoria 07:29:28 -63.6 Dark Up 75.1 173.4 Up 07:14:28 - 07:44:28 -1930
Tonasket 07:29:16 -64.2 Dark Up 74.9 186.1 Up 07:14:16 - 07:44:16 -1953
Okanogan 07:29:16 -64.5 Dark Up 75.2 185.7 Up 07:14:16 - 07:44:16 -1987
Brewster 07:29:17 -64.7 Dark Up 75.5 185.2 Up 07:14:17 - 07:44:17 -2014
Manson/Chelan 07:29:19 -64.9 Dark Up 75.7 184.0 Up 07:14:19 - 07:44:19 -2033
Wenatchee 07:29:20 -65.3 Dark Up 76.2 183.6 Up 07:14:20 - 07:44:20 -2082
Ellensburg 07:29:20 -65.7 Dark Up 76.6 182.9 Up 07:14:20 - 07:44:20 -2124
Yakima 07:29:20 -66.1 Dark Up 77.0 182.9 Up 07:14:20 - 07:44:20 -2168
Toppenish/White Swan 07:29:20 -66.3 Dark Up 77.3 183.6 Up 07:14:20 - 07:44:20 -2193
PNWRO 07:29:16 -66.9 Dark Up 77.5 189.5 Up 07:14:16 - 07:44:16 -2247
Goldendale 07:29:22 -66.7 Dark Up 77.8 182.1 Up 07:14:22 - 07:44:22 -2248
The Dalles 07:29:23 -66.9 Dark Up 78.1 180.7 Up 07:14:23 - 07:44:23 -2268
Maupin 07:29:23 -67.3 Dark Up 78.5 181.2 Up 07:14:23 - 07:44:23 -2314
Sisters 07:29:25 -68.0 Dark Up 79.4 179.1 Up 07:14:25 - 07:44:25 -2404
Bend 07:29:25 -68.3 Dark Up 79.6 180.3 Up 07:14:25 - 07:44:25 -2432
Oregon Observatory 07:29:25 -68.4 Dark Up 79.8 179.7 Up 07:14:25 - 07:44:25 -2450
North Lake 07:29:24 -69.2 Dark Up 80.4 182.3 Up 07:14:24 - 07:44:24 -2525
Chiloquin 07:29:27 -69.5 Dark Up 81.1 177.4 Up 07:14:27 - 07:44:27 -2588
Klamath Falls 07:29:27 -69.9 Dark Up 81.4 177.8 Up 07:14:27 - 07:44:27 -2626
Lakeview 07:29:22 -70.3 Dark Up 81.4 185.7 Up 07:14:22 - 07:44:22 -2646
Cedarville 07:29:22 -71.0 Dark Up 82.1 187.2 Up 07:14:22 - 07:44:22 -2720
Fall River/Burney 07:29:27 -71.1 Dark Up 82.6 179.9 Up 07:14:27 - 07:44:27 -2759
Susanville 07:29:25 -71.9 Dark Up 83.2 185.1 Up 07:14:25 - 07:44:25 -2836
Greenville 07:29:26 -72.0 Dark Up 83.5 183.2 Up 07:14:26 - 07:44:26 -2863
Gimple 07:29:26 -72.1 Dark Up 83.5 183.8 Up 07:14:26 - 07:44:26 -2864
Quincy 07:29:26 -72.2 Dark Up 83.7 183.3 Up 07:14:26 - 07:44:26 -2885
Portola 07:29:25 -72.5 Dark Up 83.8 187.0 Up 07:14:25 - 07:44:25 -2904
Dunrhomin 07:28:31 -71.9 Dark Up 75.7 247.7 Up 07:13:31 - 07:43:31 -2934
Reno 07:29:22 -72.9 Dark Up 84.0 192.4 Up 07:14:22 - 07:44:22 -2941
CU-SBO 07:28:31 -72.1 Dark Up 75.8 248.4 Up 07:13:31 - 07:43:31 -2962
Carson City 07:29:23 -73.2 Dark Up 84.3 193.3 Up 07:14:23 - 07:44:23 -2980
Gardnerville 07:29:23 -73.5 Dark Up 84.6 194.3 Up 07:14:23 - 07:44:23 -3008
Yerington 07:29:21 -73.6 Dark Up 84.4 199.0 Up 07:14:21 - 07:44:21 -3009
Hawthorne 07:29:19 -74.2 Dark Up 84.7 205.1 Up 07:14:19 - 07:44:19 -3065
Lee Vining 07:29:21 -74.6 Dark Up 85.3 203.5 Up 07:14:21 - 07:44:21 -3122
Tonopah 07:29:14 -74.9 Dark Up 84.5 218.4 Up 07:14:14 - 07:44:14 -3130
Bishop 07:29:18 -75.3 Dark Up 85.6 213.8 Up 07:14:18 - 07:44:18 -3195
Beatty 07:29:13 -76.1 Dark Up 85.1 230.3 Up 07:14:13 - 07:44:13 -3262
Indian Springs 07:29:09 -76.6 Dark Up 84.5 239.3 Up 07:14:09 - 07:44:09 -3307
Henderson 07:29:07 -77.3 Dark Up 84.3 247.1 Up 07:14:07 - 07:44:07 -3371
Patrick 07:29:03 -78.0 Dark Up 83.6 256.1 Up 07:14:03 - 07:44:03 -3448
Laughlin/Bullhead City 07:29:05 -78.2 Dark Up 84.3 256.6 Up 07:14:05 - 07:44:05 -3470
Kingman/Dolan Springs 07:29:03 -78.2 Dark Up 83.8 257.6 Up 07:14:03 - 07:44:03 -3471
Mohave Valley 07:29:05 -78.4 Dark Up 84.3 259.3 Up 07:14:05 - 07:44:05 -3501
Lake Havasu City 07:29:05 -78.8 Dark Up 84.2 263.7 Up 07:14:05 - 07:44:05 -3547
Wildwood 07:29:21 -78.3 Dark Up 87.7 259.9 Up 07:14:21 - 07:44:21 -3554
Parker 07:29:05 -79.2 Dark Up 84.2 267.1 Up 07:14:05 - 07:44:05 -3586
Idyllwild 07:29:14 -79.2 Dark Up 86.2 270.1 Up 07:14:14 - 07:44:14 -3612
George/Scottsdale 07:28:55 -79.6 Dark Up 82.2 272.2 Up 07:13:55 - 07:43:55 -3647
Calipatria 07:29:10 -80.0 Dark Up 85.1 277.8 Up 07:14:10 - 07:44:10 -3689
Yuma 07:29:07 -80.6 Dark Up 84.3 281.6 Up 07:14:07 - 07:44:07 -3744

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 15820, (2026/12/18 07:30UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 18.93  61
3Iot Aur       04:56:59.6 +33:09:58  2.7  3.09  67
14 Aur         05:15:24.3 +32:41:15  5.2  1.25  71
PPM 070028     05:12:09.6 +32:53:42  7.9  0.77  70
PPM 070018     05:11:27.6 +34:06:15 10.0  0.45  70
PPM 070027     05:11:57.0 +33:47:21 10.2  0.15  70
15820          05:11:38.2 +33:39:12 15.7        70
Positions are for J2000

Event circumstances last updated at 2022/04/25 23:04:27 UT

Marc W. Buie, Southwest Research Institute

RECON