RECON: TNO occultation with 11BM170

Event between 11BM170 and star GA1180:03466852 with event index number of 1568695

Geocentric closest approach at 2025/05/04 09:42:33 UTC

J2000 position of star is 12:26:53.8 +28:02:38
Equinox of date position of star is 12:27:54.3 +27:55:55
Stellar brightness G=11.7, use SENSEUP=8
Star is 47 degrees from the moon. Moon is 48% illuminated.
TNO apparent brightness V=26.1

[RECON map]
TNO is 39.9 AU from the Sun and 39.3 AU from the Earth.
The TNO is moving 20.6 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 140 seconds.
The 1-sigma cross-track error in the shadow position is 5457 km.
The sky-plane scale is 28502.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=407.4 km assuming a 5% albedo -- 2.9 sec chord
Diameter=166.3 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 11BM170, (2025/05/04 09:43UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:49.5 +19:03:16  0.0 26.37  73
Denebola       11:50:21.2 +14:25:50  2.1 16.08  40
15Gam Com      12:28:11.9 +28:07:41  4.4  0.22  47
PPM 101912     12:28:48.6 +27:58:08  8.4  0.16  47
11BM170        12:28:09.6 +27:54:14 11.7        47
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 23.6 km RECON observability=1.0 and success probability=6.9%
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 09:39:02 -19.7 Dark Up 39.3 268.1 Up 09:26:51 - 09:51:14 -4485
Kelowna 09:39:02 -20.1 Dark Up 39.4 268.3 Up 09:26:50 - 09:51:13 -4527
Peachland 09:39:03 -20.3 Dark Up 39.6 268.2 Up 09:26:52 - 09:51:15 -4543
Summerland 09:39:01 -20.4 Dark Up 39.5 268.3 Up 09:26:50 - 09:51:13 -4556
Penticton 09:39:01 -20.5 Dark Up 39.4 268.5 Up 09:26:50 - 09:51:13 -4561
Oliver 09:39:01 -20.8 Dark Up 39.5 268.8 Up 09:26:49 - 09:51:12 -4596
Anarchist Mountain Observatory 09:38:59 -20.9 Dark Up 39.3 269.1 Up 09:26:48 - 09:51:11 -4610
Tonasket 09:38:59 -21.2 Dark Up 39.4 269.3 Up 09:26:48 - 09:51:11 -4642
Okanogan 09:38:59 -21.5 Dark Up 39.5 269.4 Up 09:26:47 - 09:51:10 -4679
Brewster 09:38:58 -21.8 Dark Up 39.6 269.5 Up 09:26:47 - 09:51:10 -4710
Victoria 09:39:07 -22.4 Dark Up 42.0 266.4 Up 09:26:56 - 09:51:19 -4732
Manson/Chelan 09:38:59 -22.1 Dark Up 39.9 269.4 Up 09:26:48 - 09:51:11 -4739
Entiat 09:38:59 -22.3 Dark Up 39.9 269.5 Up 09:26:47 - 09:51:10 -4762
Wenatchee 09:38:58 -22.6 Dark Up 40.0 269.7 Up 09:26:47 - 09:51:10 -4790
Ellensburg 09:38:58 -23.0 Dark Up 40.2 269.8 Up 09:26:46 - 09:51:09 -4836
Yakima 09:38:57 -23.4 Dark Up 40.2 270.2 Up 09:26:46 - 09:51:09 -4878
Pasco 09:38:54 -23.3 Dark Up 39.2 271.5 Up 09:26:42 - 09:51:05 -4884
Toppenish/White Swan 09:38:56 -23.5 Dark Up 40.0 270.5 Up 09:26:45 - 09:51:08 -4897
PNWRO 09:38:52 -23.4 Dark Up 39.0 271.8 Up 09:26:40 - 09:51:03 -4905
Goldendale 09:38:56 -24.2 Dark Up 40.3 270.6 Up 09:26:45 - 09:51:08 -4962
The Dalles 09:38:57 -24.5 Dark Up 40.6 270.6 Up 09:26:45 - 09:51:08 -4992
Maupin 09:38:55 -24.8 Dark Up 40.5 271.0 Up 09:26:44 - 09:51:07 -5034
Redmond 09:38:53 -25.7 Dark Up 40.6 271.7 Up 09:26:42 - 09:51:05 -5129
Sisters 09:38:55 -25.8 Dark Up 40.8 271.4 Up 09:26:43 - 09:51:06 -5134
Niwot 09:38:14 -22.5 Dark Down 28.4 284.1 Low 09:26:03 - 09:50:26 -5148
Bend 09:38:54 -25.9 Dark Up 40.7 271.8 Up 09:26:42 - 09:51:05 -5154
SwRI 09:38:15 -22.6 Dark Down 28.4 284.1 Low 09:26:04 - 09:50:27 -5161
Oregon Observatory 09:38:54 -26.1 Dark Up 40.7 271.9 Up 09:26:42 - 09:51:05 -5174
La Pine/Gilchrist 09:38:53 -26.3 Dark Up 40.8 272.0 Up 09:26:42 - 09:51:05 -5197
North Lake 09:38:51 -26.5 Dark Up 40.3 272.8 Up 09:26:39 - 09:51:02 -5230
Paisley 09:38:49 -26.9 Dark Down 40.0 273.4 Up 09:26:38 - 09:51:01 -5280
Lakeview 09:38:48 -27.3 Dark Down 39.9 274.0 Up 09:26:37 - 09:51:00 -5329
Klamath Falls 09:38:51 -27.7 Dark Up 40.9 273.1 Up 09:26:39 - 09:51:02 -5355
Cedarville 09:38:46 -27.8 Dark Down 39.7 274.6 Up 09:26:35 - 09:50:58 -5394
Fall River/Burney 09:38:49 -28.6 Dark Down 40.6 274.3 Up 09:26:37 - 09:51:00 -5471
Susanville 09:38:46 -29.0 Dark Down 40.0 275.3 Up 09:26:34 - 09:50:57 -5522
Gimple 09:38:46 -29.3 Dark Down 40.1 275.4 Up 09:26:34 - 09:50:57 -5555
Greenville 09:38:47 -29.3 Dark Down 40.2 275.3 Up 09:26:36 - 09:50:59 -5557
Quincy 09:38:45 -29.5 Dark Down 40.1 275.5 Up 09:26:34 - 09:50:57 -5578
Portola 09:38:45 -29.4 Dark Down 39.8 275.9 Up 09:26:34 - 09:50:57 -5581
Reno 09:38:42 -29.4 Dark Down 39.3 276.5 Up 09:26:31 - 09:50:54 -5595
Carson City 09:38:42 -29.7 Dark Down 39.2 276.8 Up 09:26:30 - 09:50:53 -5633
Yerington 09:38:40 -29.7 Dark Down 38.7 277.3 Up 09:26:29 - 09:50:52 -5639
Gardnerville 09:38:41 -29.9 Dark Down 39.1 277.0 Up 09:26:29 - 09:50:52 -5657
Hawthorne 09:38:37 -29.9 Dark Down 38.2 277.9 Up 09:26:26 - 09:50:49 -5676
Tonopah 09:38:33 -29.7 Dark Down 37.1 279.0 Up 09:26:22 - 09:50:45 -5691
Lee Vining 09:38:39 -30.6 Dark Down 38.5 278.1 Up 09:26:27 - 09:50:50 -5747
Bishop 09:38:36 -30.8 Dark Down 37.9 278.9 Up 09:26:24 - 09:50:47 -5793
Beatty 09:38:31 -30.5 Dark Down 36.5 280.1 Up 09:26:19 - 09:50:42 -5802
Indian Springs 09:38:28 -30.3 Dark Down 35.6 280.9 Up 09:26:16 - 09:50:39 -5809
Henderson 09:38:25 -30.4 Dark Down 35.0 281.6 Up 09:26:14 - 09:50:37 -5847
Patrick 09:38:22 -30.4 Dark Down 34.0 282.5 Up 09:26:11 - 09:50:34 -5883
DCO 09:38:20 -30.4 Dark Down 33.4 283.0 Up 09:26:08 - 09:50:31 -5895
Searchlight/Boulder City 09:38:26 -30.9 Dark Down 34.8 282.0 Up 09:26:14 - 09:50:37 -5906
Kingman/Dolan Springs 09:38:23 -30.7 Dark Down 34.1 282.6 Up 09:26:11 - 09:50:34 -5911
Laughlin/Bullhead City 09:38:23 -31.0 Dark Down 34.5 282.3 Up 09:26:11 - 09:50:34 -5928
Mohave Valley 09:38:23 -31.2 Dark Down 34.4 282.5 Up 09:26:11 - 09:50:34 -5956
Lake Havasu City 09:38:22 -31.4 Dark Down 34.1 282.9 Up 09:26:10 - 09:50:33 -5991
George/Scottsdale 09:38:16 -30.8 Dark Down 32.0 284.5 Up 09:26:04 - 09:50:27 -6003
Parker 09:38:21 -31.7 Dark Down 34.0 283.1 Up 09:26:10 - 09:50:33 -6028
CPSLO 09:38:38 -33.5 Dark Down 39.3 279.5 Up 09:26:27 - 09:50:50 -6064
Blythe 09:38:22 -32.3 Dark Down 34.2 283.4 Up 09:26:11 - 09:50:34 -6091
Idyllwild 09:38:26 -33.2 Dark Down 35.9 282.4 Up 09:26:15 - 09:50:38 -6135
Wildwood 09:38:31 -33.7 Dark Down 37.5 281.3 Up 09:26:20 - 09:50:43 -6145
Calipatria 09:38:23 -33.1 Dark Down 34.8 283.3 Up 09:26:11 - 09:50:34 -6168
Yuma 09:38:21 -33.0 Dark Down 34.0 284.0 Up 09:26:09 - 09:50:32 -6190

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 11BM170, (2025/05/04 09:43UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.1 +19:10:16  0.0 26.37  73
Denebola       11:49:02.9 +14:34:17  2.1 16.08  40
15Gam Com      12:26:56.1 +28:16:05  4.4  0.22  47
PPM 101912     12:27:32.9 +28:06:32  8.4  0.16  47
11BM170        12:26:53.8 +28:02:38 11.7        47
Positions are for J2000

Event circumstances last updated at 2020/03/26 23:28:08 UT

Marc W. Buie, Southwest Research Institute

RECON