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 07:25:54 UTC

J2000 position of star is 05:11:38.2 +33:39:12
Equinox of date position of star is 05:12:58.1 +33:40:36
Stellar brightness G=15.7, use SENSEUP=128
Star is 70 degrees from the moon. Moon is 61% illuminated.
TNO apparent brightness V=24.4

[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 1153 seconds.
The 1-sigma cross-track error in the shadow position is 4387 km.
The sky-plane scale is 19247.4 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=208.9 km assuming a 5% albedo -- 2.5 sec chord
Diameter=85.3 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 15820, (2026/12/18 07:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.2 +16:33:42  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 0.8 sigma about the mid-time.
The median site spacing is 25.0 km RECON observability=1.0 and success probability=12.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 07:25:41 -62.6 Dark Up 73.4 183.3 Up 07:10:41 - 07:40:41 2292
Kelowna 07:25:42 -62.9 Dark Up 73.8 182.9 Up 07:10:42 - 07:40:42 2252
Peachland 07:25:42 -63.0 Dark Up 73.9 182.0 Up 07:10:42 - 07:40:42 2243
Summerland 07:25:42 -63.2 Dark Up 74.0 182.3 Up 07:10:42 - 07:40:42 2226
Penticton 07:25:42 -63.2 Dark Up 74.1 182.7 Up 07:10:42 - 07:40:42 2218
Oliver 07:25:42 -63.6 Dark Up 74.5 182.8 Up 07:10:42 - 07:40:42 2181
Anarchist Mountain Observatory 07:25:42 -63.8 Dark Up 74.6 183.4 Up 07:10:42 - 07:40:42 2161
Victoria 07:25:54 -63.4 Dark Up 75.0 170.6 Up 07:10:54 - 07:40:54 2153
Tonasket 07:25:42 -64.1 Dark Up 74.9 183.2 Up 07:10:42 - 07:40:42 2128
Okanogan 07:25:43 -64.4 Dark Up 75.3 182.8 Up 07:10:43 - 07:40:43 2094
Brewster 07:25:44 -64.6 Dark Up 75.6 182.2 Up 07:10:44 - 07:40:44 2067
Manson/Chelan 07:25:45 -64.7 Dark Up 75.8 181.0 Up 07:10:45 - 07:40:45 2049
Entiat 07:25:45 -64.9 Dark Up 76.0 180.8 Up 07:10:45 - 07:40:45 2026
Wenatchee 07:25:46 -65.1 Dark Up 76.2 180.5 Up 07:10:46 - 07:40:46 2000
Ellensburg 07:25:47 -65.5 Dark Up 76.7 179.7 Up 07:10:47 - 07:40:47 1958
Yakima 07:25:47 -65.9 Dark Up 77.1 179.6 Up 07:10:47 - 07:40:47 1914
Toppenish/White Swan 07:25:47 -66.1 Dark Up 77.3 180.3 Up 07:10:47 - 07:40:47 1889
Pasco 07:25:43 -66.5 Dark Up 77.4 185.0 Up 07:10:43 - 07:40:43 1863
Goldendale 07:25:48 -66.5 Dark Up 77.8 178.6 Up 07:10:48 - 07:40:48 1835
PNWRO 07:25:42 -66.8 Dark Up 77.6 186.0 Up 07:10:42 - 07:40:42 1834
The Dalles 07:25:50 -66.7 Dark Up 78.0 177.1 Up 07:10:50 - 07:40:50 1815
Maupin 07:25:50 -67.1 Dark Up 78.5 177.5 Up 07:10:50 - 07:40:50 1768
Sisters 07:25:52 -67.8 Dark Up 79.3 175.1 Up 07:10:52 - 07:40:52 1679
Redmond 07:25:51 -67.9 Dark Up 79.4 176.9 Up 07:10:51 - 07:40:51 1672
Bend 07:25:51 -68.1 Dark Up 79.6 176.2 Up 07:10:51 - 07:40:51 1651
Oregon Observatory 07:25:52 -68.2 Dark Up 79.7 175.5 Up 07:10:52 - 07:40:52 1633
La Pine/Gilchrist 07:25:52 -68.4 Dark Up 79.9 175.1 Up 07:10:52 - 07:40:52 1612
North Lake 07:25:51 -68.9 Dark Up 80.4 177.9 Up 07:10:51 - 07:40:51 1558
Paisley 07:25:50 -69.5 Dark Up 81.0 179.6 Up 07:10:50 - 07:40:50 1494
Klamath Falls 07:25:54 -69.6 Dark Up 81.4 172.8 Up 07:10:54 - 07:40:54 1458
Lakeview 07:25:49 -70.1 Dark Up 81.5 180.7 Up 07:10:49 - 07:40:49 1436
Cedarville 07:25:49 -70.7 Dark Up 82.1 181.8 Up 07:10:49 - 07:40:49 1363
Fall River/Burney 07:25:54 -70.8 Dark Up 82.6 174.2 Up 07:10:54 - 07:40:54 1325
Susanville 07:25:51 -71.6 Dark Up 83.2 178.8 Up 07:10:51 - 07:40:51 1247
Greenville 07:25:53 -71.7 Dark Up 83.5 176.6 Up 07:10:53 - 07:40:53 1220
Gimple 07:25:52 -71.8 Dark Up 83.5 177.2 Up 07:10:52 - 07:40:52 1219
Quincy 07:25:53 -71.9 Dark Up 83.7 176.5 Up 07:10:53 - 07:40:53 1198
Portola 07:25:51 -72.2 Dark Up 83.8 180.1 Up 07:10:51 - 07:40:51 1179
Reno 07:25:49 -72.6 Dark Up 84.1 185.3 Up 07:10:49 - 07:40:49 1142
Niwot 07:24:57 -72.3 Dark Up 76.3 246.6 Up 07:09:57 - 07:39:57 1121
SwRI 07:24:58 -72.4 Dark Up 76.4 246.8 Up 07:09:58 - 07:39:58 1110
Carson City 07:25:49 -73.0 Dark Up 84.4 185.8 Up 07:10:49 - 07:40:49 1102
Gardnerville 07:25:49 -73.2 Dark Up 84.7 186.5 Up 07:10:49 - 07:40:49 1075
Yerington 07:25:47 -73.3 Dark Up 84.6 191.5 Up 07:10:47 - 07:40:47 1074
Hawthorne 07:25:46 -73.9 Dark Up 84.9 197.4 Up 07:10:46 - 07:40:46 1017
Lee Vining 07:25:48 -74.3 Dark Up 85.6 194.6 Up 07:10:48 - 07:40:48 960
Tonopah 07:25:40 -74.7 Dark Up 84.9 211.6 Up 07:10:40 - 07:40:40 951
Bishop 07:25:45 -75.1 Dark Up 85.9 205.0 Up 07:10:45 - 07:40:45 887
Beatty 07:25:39 -76.0 Dark Up 85.6 223.8 Up 07:10:39 - 07:40:39 819
Indian Springs 07:25:36 -76.5 Dark Up 85.1 234.4 Up 07:10:36 - 07:40:36 773
Henderson 07:25:33 -77.1 Dark Up 84.9 243.4 Up 07:10:33 - 07:40:33 708
CPSLO 07:25:55 -76.1 Dark Up 88.3 175.3 Up 07:10:55 - 07:40:55 687
Searchlight/Boulder City 07:25:33 -77.7 Dark Up 85.1 249.7 Up 07:10:33 - 07:40:33 644
Patrick 07:25:29 -77.9 Dark Up 84.3 253.8 Up 07:10:29 - 07:40:29 630
Laughlin/Bullhead City 07:25:32 -78.0 Dark Up 85.0 254.2 Up 07:10:32 - 07:40:32 609
Kingman/Dolan Springs 07:25:30 -78.1 Dark Up 84.5 255.4 Up 07:10:30 - 07:40:30 607
DCO 07:25:27 -78.3 Dark Up 83.9 258.4 Up 07:10:27 - 07:40:27 592
Mohave Valley 07:25:32 -78.3 Dark Up 85.0 257.2 Up 07:10:32 - 07:40:32 579
Lake Havasu City 07:25:31 -78.7 Dark Up 84.9 262.2 Up 07:10:31 - 07:40:31 532
Wildwood 07:25:48 -78.0 Dark Up 88.4 254.7 Up 07:10:48 - 07:40:48 529
Parker 07:25:31 -79.1 Dark Up 84.9 266.2 Up 07:10:31 - 07:40:31 493
Idyllwild 07:25:41 -79.0 Dark Up 86.9 269.5 Up 07:10:41 - 07:40:41 469
Blythe 07:25:33 -79.6 Dark Up 85.2 272.0 Up 07:10:33 - 07:40:33 438
George/Scottsdale 07:25:22 -79.7 Dark Up 82.9 271.9 Up 07:10:22 - 07:40:22 430
Calipatria 07:25:36 -79.9 Dark Up 85.9 278.7 Up 07:10:36 - 07:40:36 391
Yuma 07:25:33 -80.5 Dark Up 85.1 282.8 Up 07:10:33 - 07:40:33 336

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 07:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  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 2020/04/03 21:59:59 UT

Marc W. Buie, Southwest Research Institute

RECON