RECON: TNO occultation with 73480

Event between (73480) 02PN34 and star GA1240:00667507 with event index number of 2647139

Geocentric closest approach at 2025/12/19 09:01:04 UTC

J2000 position of star is 03:17:44.9 +34:00:21
Equinox of date position of star is 03:19:08.7 +34:05:11
Stellar brightness G=13.4, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 154 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 28.7 AU from the Sun and 27.9 AU from the Earth.
The TNO is moving 21.6 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 104 seconds.
The 1-sigma cross-track error in the shadow position is 1633 km.
The sky-plane scale is 20238.4 km/arcsec.

The TNO has an absolute magnitude Hv=8.5
Diameter=118.6 km assuming a 5% albedo -- 5.5 sec chord
Diameter=48.4 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 73480, (2025/12/19 09:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.8 +16:33:34  0.8 24.78 165
Algol          03:09:52.1 +41:03:14  2.1  7.20 151
PPM 068330     03:20:21.8 +34:18:57  5.9  0.30 154
PPM 068274     03:17:40.1 +34:46:58  7.2  0.77 154
PPM 068305     03:19:15.7 +34:12:49  9.9  0.12 154
73480          03:19:22.6 +34:05:58 13.4       155
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 5.0 sigma about the mid-time.
The median site spacing is 31.9 km RECON observability=1.0 and success probability=21.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:57:24 -53.7 Dark Down 39.7 276.7 Up 08:48:14 - 09:06:33 3680
Kamloops 08:57:53 -60.4 Dark Down 48.6 267.2 Up 08:48:44 - 09:07:03 3343
Kelowna 08:57:51 -60.8 Dark Down 48.0 268.8 Up 08:48:41 - 09:07:00 3260
Peachland 08:57:51 -61.0 Dark Down 48.2 268.7 Up 08:48:42 - 09:07:01 3246
Summerland 08:57:51 -61.1 Dark Down 48.2 268.9 Up 08:48:41 - 09:07:00 3230
Penticton 08:57:50 -61.2 Dark Down 48.1 269.1 Up 08:48:41 - 09:07:00 3224
Oliver 08:57:51 -61.5 Dark Down 48.1 269.5 Up 08:48:41 - 09:07:00 3185
Anarchist Mountain Observatory 08:57:50 -61.5 Dark Down 48.0 269.8 Up 08:48:40 - 09:06:59 3168
Tonasket 08:57:49 -61.8 Dark Down 48.0 270.1 Up 08:48:40 - 09:06:59 3133
Okanogan 08:57:50 -62.2 Dark Down 48.1 270.4 Up 08:48:40 - 09:06:59 3095
Victoria 08:58:00 -63.2 Dark Down 50.6 267.3 Up 08:48:50 - 09:07:09 3087
Brewster 08:57:50 -62.5 Dark Down 48.2 270.5 Up 08:48:41 - 09:07:00 3064
Manson/Chelan 08:57:51 -62.8 Dark Down 48.5 270.5 Up 08:48:41 - 09:07:00 3038
Wenatchee 08:57:51 -63.2 Dark Down 48.6 270.9 Up 08:48:41 - 09:07:00 2984
Ellensburg 08:57:51 -63.7 Dark Down 48.7 271.2 Up 08:48:42 - 09:07:01 2937
Yakima 08:57:51 -64.0 Dark Down 48.7 271.7 Up 08:48:41 - 09:07:00 2892
Toppenish/White Swan 08:57:51 -64.1 Dark Down 48.6 272.0 Up 08:48:41 - 09:07:00 2869
PNWRO 08:57:47 -63.9 Dark Down 47.6 273.5 Up 08:48:37 - 09:06:56 2841
Goldendale 08:57:52 -64.8 Dark Down 48.9 272.4 Up 08:48:42 - 09:07:01 2805
The Dalles 08:57:52 -65.1 Dark Down 49.1 272.4 Up 08:48:43 - 09:07:02 2777
Maupin 08:57:52 -65.4 Dark Down 49.0 272.9 Up 08:48:43 - 09:07:02 2732
Sisters 08:57:52 -66.3 Dark Down 49.3 273.6 Up 08:48:43 - 09:07:02 2631
Bend 08:57:52 -66.4 Dark Down 49.1 274.1 Up 08:48:43 - 09:07:02 2606
Oregon Observatory 08:57:52 -66.6 Dark Down 49.2 274.2 Up 08:48:43 - 09:07:02 2586
North Lake 08:57:50 -66.9 Dark Down 48.8 275.3 Up 08:48:41 - 09:07:00 2519
Chiloquin 08:57:53 -67.9 Dark Down 49.4 275.5 Up 08:48:43 - 09:07:02 2437
Dunrhomin 08:57:08 -59.8 Dark Down 36.8 286.3 Up 08:47:58 - 09:06:17 2436
CU-SBO 08:57:08 -60.0 Dark Down 36.8 286.5 Up 08:47:59 - 09:06:18 2407
Lakeview 08:57:48 -67.6 Dark Down 48.3 276.8 Up 08:48:39 - 09:06:58 2407
Klamath Falls 08:57:53 -68.1 Dark Down 49.3 275.9 Up 08:48:43 - 09:07:02 2400
Cedarville 08:57:48 -68.0 Dark Down 48.1 277.6 Up 08:48:38 - 09:06:57 2336
Fall River/Burney 08:57:51 -68.9 Dark Down 48.9 277.5 Up 08:48:41 - 09:07:00 2272
Susanville 08:57:49 -69.1 Dark Down 48.3 278.6 Up 08:48:39 - 09:06:58 2209
Gimple 08:57:49 -69.4 Dark Down 48.4 278.8 Up 08:48:40 - 09:06:59 2176
Greenville 08:57:49 -69.4 Dark Down 48.4 278.7 Up 08:48:40 - 09:06:59 2176
Quincy 08:57:49 -69.6 Dark Down 48.4 279.0 Up 08:48:40 - 09:06:59 2153
Portola 08:57:48 -69.4 Dark Down 48.0 279.3 Up 08:48:39 - 09:06:58 2144
Reno 08:57:46 -69.3 Dark Down 47.5 279.9 Up 08:48:37 - 09:06:56 2120
Carson City 08:57:46 -69.5 Dark Down 47.4 280.3 Up 08:48:36 - 09:06:55 2081
Yerington 08:57:44 -69.3 Dark Down 46.9 280.8 Up 08:48:35 - 09:06:54 2065
Gardnerville 08:57:46 -69.7 Dark Down 47.3 280.6 Up 08:48:36 - 09:06:55 2054
Hawthorne 08:57:42 -69.4 Dark Down 46.4 281.6 Up 08:48:33 - 09:06:52 2020
Tonopah 08:57:38 -68.8 Dark Down 45.2 282.7 Up 08:48:29 - 09:06:48 1984
Lee Vining 08:57:44 -70.0 Dark Down 46.7 281.9 Up 08:48:34 - 09:06:53 1952
Bishop 08:57:42 -70.0 Dark Down 46.0 282.9 Up 08:48:32 - 09:06:51 1895
Beatty 08:57:37 -69.2 Dark Down 44.6 284.0 Up 08:48:27 - 09:06:46 1863
Indian Springs 08:57:33 -68.7 Dark Down 43.7 284.7 Up 08:48:24 - 09:06:43 1842
Henderson 08:57:31 -68.5 Dark Down 43.0 285.5 Up 08:48:22 - 09:06:41 1794
Patrick 08:57:28 -68.0 Dark Down 42.0 286.5 Up 08:48:19 - 09:06:38 1743
Kingman/Dolan Springs 08:57:29 -68.3 Dark Down 42.1 286.6 Up 08:48:19 - 09:06:38 1716
Laughlin/Bullhead City 08:57:30 -68.7 Dark Down 42.5 286.4 Up 08:48:20 - 09:06:39 1705
Mohave Valley 08:57:30 -68.8 Dark Down 42.4 286.6 Up 08:48:20 - 09:06:39 1676
Lake Havasu City 08:57:29 -68.8 Dark Down 42.1 287.1 Up 08:48:20 - 09:06:39 1636
Parker 08:57:29 -68.9 Dark Down 42.0 287.4 Up 08:48:20 - 09:06:39 1599
George/Scottsdale 08:57:22 -67.2 Dark Down 39.9 288.6 Up 08:48:12 - 09:06:31 1594
Wildwood 08:57:42 -72.0 Dark Down 45.3 286.0 Up 08:48:32 - 09:06:51 1535
Idyllwild 08:57:36 -70.9 Dark Down 43.7 287.0 Up 08:48:27 - 09:06:46 1519
Calipatria 08:57:33 -70.3 Dark Down 42.6 287.9 Up 08:48:23 - 09:06:42 1470
Yuma 08:57:30 -69.7 Dark Down 41.8 288.5 Up 08:48:20 - 09:06:39 1437

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 73480, (2025/12/19 09:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 24.78 165
Algol          03:08:10.1 +40:57:20  2.1  7.20 151
PPM 068330     03:18:43.9 +34:13:22  5.9  0.30 154
PPM 068274     03:16:02.0 +34:41:18  7.2  0.77 154
PPM 068305     03:17:37.9 +34:07:11  9.9  0.12 154
73480          03:17:44.9 +34:00:21 13.4       154
Positions are for J2000

Event circumstances last updated at 2022/04/11 23:11:17 UT

Marc W. Buie, Southwest Research Institute

RECON