RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star GA0840:16688397 with event index number of 1421444

Geocentric closest approach at 2025/05/19 09:09:03 UTC

J2000 position of star is 19:14:21.4 -05:03:16
Equinox of date position of star is 19:15:25.9 -05:01:06
Stellar brightness G=14.2, use SENSEUP=64
Star is 32 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=26.7

[RECON map]
TNO is 46.1 AU from the Sun and 45.5 AU from the Earth.
The TNO is moving 15.8 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 573 seconds.
The 1-sigma cross-track error in the shadow position is 4925 km.
The sky-plane scale is 32984.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=1148.2 km assuming a 5% albedo -- 3.8 sec chord
Diameter=468.7 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2025/05/19 09:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.1 -26:29:10  0.9 44.77  65
Tarazed        19:47:28.0 +10:40:36  2.7 17.57  37
26 Aql         19:21:54.1 -05:21:59  5.0  1.58  31
PPM 202644     19:13:48.5 -05:22:14  8.3  0.59  33
PPM 202673     19:15:19.1 -04:47:57  9.4  0.23  33
307261         19:15:42.3 -05:00:33 14.2        32
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 1.6 sigma about the mid-time.
The median site spacing is 19.2 km RECON observability=1.0 and success probability=7.8%
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 09:13:01 -17.7 AT Up 28.1 142.8 Low 08:58:01 - 09:28:01 1157
Kelowna 09:13:02 -18.1 Dark Up 28.3 142.6 Low 08:58:02 - 09:28:02 1124
Peachland 09:13:04 -18.3 Dark Up 28.3 142.2 Low 08:58:04 - 09:28:04 1108
Summerland 09:13:04 -18.4 Dark Up 28.4 142.3 Low 08:58:04 - 09:28:04 1099
Penticton 09:13:03 -18.5 Dark Up 28.5 142.4 Low 08:58:03 - 09:28:03 1096
Oliver 09:13:04 -18.8 Dark Up 28.8 142.2 Low 08:58:04 - 09:28:04 1069
Anarchist Mountain Observatory 09:13:03 -18.9 Dark Up 29.0 142.4 Low 08:58:03 - 09:28:03 1061
Tonasket 09:13:04 -19.2 Dark Up 29.2 142.2 Low 08:58:04 - 09:28:04 1035
Okanogan 09:13:05 -19.6 Dark Up 29.4 141.9 Low 08:58:05 - 09:28:05 1005
Brewster 09:13:06 -19.9 Dark Up 29.6 141.6 Low 08:58:06 - 09:28:06 979
Manson/Chelan 09:13:08 -20.1 Dark Up 29.6 141.2 Low 08:58:08 - 09:28:08 953
Entiat 09:13:08 -20.4 Dark Up 29.7 141.0 Low 08:58:08 - 09:28:08 934
Victoria 09:13:18 -20.2 Dark Up 27.7 138.1 Low 08:58:18 - 09:28:18 928
Wenatchee 09:13:09 -20.6 Dark Up 29.9 140.9 Low 08:58:09 - 09:28:09 911
Ellensburg 09:13:10 -21.1 Dark Up 30.1 140.5 Up 08:58:10 - 09:28:10 873
Pasco 09:13:06 -21.4 Dark Up 31.3 141.7 Up 08:58:06 - 09:28:06 847
Yakima 09:13:11 -21.5 Dark Up 30.4 140.3 Up 08:58:11 - 09:28:11 840
PNWRO 09:13:06 -21.6 Dark Up 31.6 141.8 Up 08:58:06 - 09:28:06 833
Toppenish/White Swan 09:13:10 -21.6 Dark Up 30.7 140.4 Up 08:58:10 - 09:28:10 826
Goldendale 09:13:13 -22.2 Dark Up 30.9 139.8 Up 08:58:13 - 09:28:13 771
The Dalles 09:13:14 -22.5 Dark Up 30.9 139.3 Up 08:58:14 - 09:28:14 743
Niwot 09:12:09 -22.3 Dark Up 41.8 155.0 Up 08:57:09 - 09:27:09 719
Maupin 09:13:15 -22.9 Dark Up 31.3 139.2 Up 08:58:15 - 09:28:15 711
SwRI 09:12:10 -22.4 Dark Up 41.8 154.9 Up 08:57:10 - 09:27:10 707
Redmond 09:13:16 -23.8 Dark Up 31.9 138.8 Up 08:58:16 - 09:28:16 634
Sisters 09:13:18 -23.8 Dark Up 31.7 138.4 Up 08:58:18 - 09:28:18 626
Bend 09:13:17 -24.0 Dark Up 32.0 138.6 Up 08:58:17 - 09:28:17 613
Oregon Observatory 09:13:17 -24.2 Dark Up 32.1 138.4 Up 08:58:17 - 09:28:17 595
La Pine/Gilchrist 09:13:18 -24.4 Dark Up 32.2 138.2 Up 08:58:18 - 09:28:18 576
North Lake 09:13:16 -24.7 Dark Up 32.8 138.6 Up 08:58:16 - 09:28:16 554
Paisley 09:13:15 -25.1 Dark Up 33.4 138.8 Up 08:58:15 - 09:28:15 517
Lakeview 09:13:15 -25.6 Dark Up 33.9 138.8 Up 08:58:15 - 09:28:15 478
Klamath Falls 09:13:20 -25.9 Dark Up 33.2 137.3 Up 08:58:20 - 09:28:20 444
Cedarville 09:13:15 -26.1 Dark Up 34.5 138.6 Up 08:58:15 - 09:28:15 426
Fall River/Burney 09:13:20 -26.9 Dark Up 34.2 137.2 Up 08:58:20 - 09:28:20 352
Susanville 09:13:17 -27.3 Dark Up 35.1 137.6 Up 08:58:17 - 09:28:17 316
Gimple 09:13:19 -27.6 Dark Up 35.2 137.3 Up 08:58:19 - 09:28:19 286
Greenville 09:13:19 -27.6 Dark Up 35.1 137.2 Up 08:58:19 - 09:28:19 284
Portola 09:13:17 -27.8 Dark Up 35.6 137.5 Up 08:58:17 - 09:28:17 268
Quincy 09:13:19 -27.8 Dark Up 35.3 137.1 Up 08:58:19 - 09:28:19 266
Reno 09:13:15 -27.9 Dark Up 36.1 138.1 Up 08:58:15 - 09:28:15 262
Yerington 09:13:12 -28.2 Dark Up 36.9 138.5 Up 08:58:12 - 09:28:12 231
Carson City 09:13:15 -28.2 Dark Up 36.4 137.9 Up 08:58:15 - 09:28:15 231
Gardnerville 09:13:15 -28.4 Dark Up 36.6 137.9 Up 08:58:15 - 09:28:15 211
Hawthorne 09:13:10 -28.5 Dark Up 37.5 138.8 Up 08:58:10 - 09:28:10 204
Tonopah 09:13:04 -28.5 Dark Up 38.6 140.1 Up 08:58:04 - 09:28:04 203
Lee Vining 09:13:13 -29.2 Dark Up 37.7 138.0 Up 08:58:13 - 09:28:13 141
Indian Springs 09:12:58 -29.4 Dark Up 40.5 141.0 Up 08:57:58 - 09:27:58 114
Beatty 09:13:03 -29.4 Dark Up 39.7 140.0 Up 08:58:03 - 09:28:03 112
Bishop 09:13:10 -29.5 Dark Up 38.5 138.5 Up 08:58:10 - 09:28:10 107
Henderson 09:12:55 -29.6 Dark Up 41.2 141.5 Up 08:57:55 - 09:27:55 86
Patrick 09:12:50 -29.8 Dark Up 42.3 142.4 Up 08:57:50 - 09:27:50 62
DCO 09:12:47 -29.8 Dark Up 42.9 143.1 Up 08:57:47 - 09:27:47 56
Kingman/Dolan Springs 09:12:51 -30.0 Dark Up 42.4 142.1 Up 08:57:51 - 09:27:51 36
Searchlight/Boulder City 09:12:55 -30.1 Dark Up 41.7 141.2 Up 08:57:55 - 09:27:55 36
Laughlin/Bullhead City 09:12:53 -30.3 Dark Up 42.1 141.5 Up 08:57:53 - 09:27:53 19
Mohave Valley 09:12:53 -30.5 Dark Up 42.3 141.3 Up 08:57:53 - 09:27:53 -6
George/Scottsdale 09:12:40 -30.5 Dark Up 44.6 143.8 Up 08:57:40 - 09:27:40 -31
Lake Havasu City 09:12:52 -30.8 Dark Up 42.8 141.4 Up 08:57:52 - 09:27:52 -35
Parker 09:12:52 -31.1 Dark Up 43.1 141.2 Up 08:57:52 - 09:27:52 -66
Blythe 09:12:53 -31.6 Dark Up 43.3 140.5 Up 08:57:53 - 09:27:53 -123
CPSLO 09:13:21 -32.1 Dark Up 38.8 135.0 Up 08:58:21 - 09:28:21 -146
Idyllwild 09:13:03 -32.3 Dark Up 42.1 138.2 Up 08:58:03 - 09:28:03 -175
Calipatria 09:12:58 -32.4 Dark Up 43.2 139.2 Up 08:57:58 - 09:27:58 -197
Wildwood 09:13:12 -32.6 Dark Up 40.8 136.4 Up 08:58:12 - 09:28:12 -198
Yuma 09:12:53 -32.5 Dark Up 44.0 139.9 Up 08:57:53 - 09:27:53 -210

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 307261, (2025/05/19 09:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 44.77  65
Tarazed        19:46:15.6 +10:36:48  2.7 17.57  37
26 Aql         19:20:33.1 -05:24:56  5.0  1.58  31
PPM 202644     19:12:27.4 -05:24:54  8.3  0.59  33
PPM 202673     19:13:58.3 -04:50:39  9.4  0.23  33
307261         19:14:21.4 -05:03:16 14.2        32
Positions are for J2000

Event circumstances last updated at 2020/03/27 20:52:57 UT

Marc W. Buie, Southwest Research Institute

RECON