RECON: TNO occultation with 47171

Event between (47171) Lempo and star GA1040:00401765 with event index number of 1628229

Geocentric closest approach at 2026/11/07 07:20:38 UTC

J2000 position of star is 03:54:40.3 +14:50:43
Equinox of date position of star is 03:55:48.4 +14:54:12
Stellar brightness G=11.3, use SENSEUP=8
Star is 141 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=24.9

[RECON map]
TNO is 31.2 AU from the Sun and 30.2 AU from the Earth.
The TNO is moving 23.3 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 186 seconds.
The 1-sigma cross-track error in the shadow position is 2065 km.
The sky-plane scale is 21919.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=660.7 km assuming a 5% albedo -- 2.6 sec chord
Diameter=269.7 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 47171, (2026/11/07 07:21UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.9 +16:33:41  0.8 10.07 131
Menkar         03:03:41.2 +04:11:37  2.5 16.79 152
PPM 119411     03:52:45.5 +13:07:31  6.2  1.98 142
PPM 119503     04:00:06.2 +15:09:40  8.4  0.98 140
PPM 119446     03:55:34.2 +15:13:09  8.7  0.33 141
PPM 119448     03:55:48.8 +14:43:43 11.9  0.21 141
47171          03:56:11.0 +14:55:21 11.3       141
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 4.8 sigma about the mid-time.
The median site spacing is 23.0 km RECON observability=1.0 and success probability=8.7%
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 07:21:08 -55.8 Dark Down 50.7 146.6 Up 07:06:08 - 07:36:08 4976
Kelowna 07:21:10 -56.2 Dark Down 50.9 146.1 Up 07:06:10 - 07:36:10 4948
Peachland 07:21:11 -56.3 Dark Down 50.9 145.6 Up 07:06:11 - 07:36:11 4945
Summerland 07:21:10 -56.4 Dark Down 51.1 145.6 Up 07:06:10 - 07:36:10 4931
Penticton 07:21:10 -56.5 Dark Down 51.2 145.7 Up 07:06:10 - 07:36:10 4923
Victoria 07:21:23 -57.0 Dark Down 50.5 139.7 Up 07:06:23 - 07:36:23 4921
Oliver 07:21:11 -56.9 Dark Down 51.5 145.5 Up 07:06:11 - 07:36:11 4894
Anarchist Mountain Observatory 07:21:11 -57.0 Dark Down 51.7 145.7 Up 07:06:11 - 07:36:11 4876
Tonasket 07:21:12 -57.3 Dark Down 51.9 145.3 Up 07:06:12 - 07:36:12 4852
Okanogan 07:21:13 -57.7 Dark Down 52.1 144.9 Up 07:06:13 - 07:36:13 4827
Brewster 07:21:14 -57.9 Dark Down 52.3 144.4 Up 07:06:14 - 07:36:14 4809
Manson/Chelan 07:21:15 -58.1 Dark Down 52.3 143.7 Up 07:06:15 - 07:36:15 4799
Entiat 07:21:17 -58.3 Dark Down 52.4 143.4 Up 07:06:17 - 07:36:17 4782
Wenatchee 07:21:17 -58.5 Dark Down 52.6 143.1 Up 07:06:17 - 07:36:17 4763
Ellensburg 07:21:19 -58.9 Dark Down 52.8 142.5 Up 07:06:19 - 07:36:19 4733
Yakima 07:21:20 -59.3 Dark Down 53.2 142.1 Up 07:06:20 - 07:36:20 4699
Toppenish/White Swan 07:21:19 -59.5 Dark Down 53.4 142.2 Up 07:06:19 - 07:36:19 4677
Goldendale 07:21:22 -60.0 Dark Down 53.7 141.1 Up 07:06:22 - 07:36:22 4639
Pasco 07:21:16 -59.8 Dark Down 54.0 143.9 Up 07:06:16 - 07:36:16 4639
The Dalles 07:21:24 -60.2 Dark Down 53.7 140.4 Up 07:06:24 - 07:36:24 4628
PNWRO 07:21:15 -60.1 Dark Down 54.3 144.1 Up 07:06:15 - 07:36:15 4613
Maupin 07:21:24 -60.6 Dark Down 54.0 140.2 Up 07:06:24 - 07:36:24 4590
Sisters 07:21:27 -61.4 Dark Down 54.5 138.7 Up 07:06:27 - 07:36:27 4525
Redmond 07:21:26 -61.5 Dark Down 54.7 139.3 Up 07:06:26 - 07:36:26 4514
Bend 07:21:27 -61.6 Dark Down 54.8 138.9 Up 07:06:27 - 07:36:27 4499
Oregon Observatory 07:21:28 -61.8 Dark Down 54.9 138.5 Up 07:06:28 - 07:36:28 4486
La Pine/Gilchrist 07:21:28 -62.0 Dark Down 55.0 138.2 Up 07:06:28 - 07:36:28 4470
North Lake 07:21:28 -62.5 Dark Down 55.6 138.7 Up 07:06:28 - 07:36:28 4418
Paisley 07:21:28 -63.1 Dark Down 56.2 138.7 Up 07:06:28 - 07:36:28 4361
Klamath Falls 07:21:33 -63.3 Dark Down 55.9 136.4 Up 07:06:33 - 07:36:33 4348
Lakeview 07:21:28 -63.6 Dark Down 56.7 138.5 Up 07:06:28 - 07:36:28 4311
Cedarville 07:21:29 -64.3 Dark Down 57.2 138.1 Up 07:06:29 - 07:36:29 4248
Fall River/Burney 07:21:34 -64.5 Dark Down 57.0 135.8 Up 07:06:34 - 07:36:34 4233
Susanville 07:21:32 -65.3 Dark Down 57.8 136.2 Up 07:06:32 - 07:36:32 4158
Greenville 07:21:34 -65.5 Dark Down 57.9 135.4 Up 07:06:34 - 07:36:34 4140
Gimple 07:21:34 -65.5 Dark Down 57.9 135.6 Up 07:06:34 - 07:36:34 4138
Quincy 07:21:34 -65.7 Dark Down 58.0 135.2 Up 07:06:34 - 07:36:34 4121
Portola 07:21:33 -65.9 Dark Down 58.4 135.8 Up 07:06:33 - 07:36:33 4098
Reno 07:21:32 -66.3 Dark Down 58.9 136.5 Up 07:06:32 - 07:36:32 4058
Carson City 07:21:33 -66.6 Dark Down 59.2 136.1 Up 07:06:33 - 07:36:33 4024
Gardnerville 07:21:33 -66.9 Dark Down 59.4 135.9 Up 07:06:33 - 07:36:33 4001
Yerington 07:21:30 -66.9 Dark Down 59.6 136.9 Up 07:06:30 - 07:36:30 3991
Hawthorne 07:21:30 -67.5 Dark Down 60.3 137.2 Up 07:06:30 - 07:36:30 3935
Lee Vining 07:21:33 -68.0 Dark Down 60.4 135.7 Up 07:06:33 - 07:36:33 3894
Tonopah 07:21:25 -68.1 Dark Down 61.3 139.0 Up 07:06:25 - 07:36:25 3857
Bishop 07:21:31 -68.7 Dark Down 61.2 136.2 Up 07:06:31 - 07:36:31 3820
Niwot 07:20:42 -64.9 Dark Down 64.0 164.1 Up 07:05:42 - 07:35:42 3787
SwRI 07:20:42 -65.0 Dark Down 64.1 163.8 Up 07:05:42 - 07:35:42 3778
Beatty 07:21:26 -69.3 Dark Down 62.5 138.3 Up 07:06:26 - 07:36:26 3735
CPSLO 07:21:43 -70.2 Dark Down 61.3 129.9 Up 07:06:43 - 07:36:43 3680
Indian Springs 07:21:23 -69.7 Dark Down 63.3 139.8 Up 07:06:23 - 07:36:23 3678
Henderson 07:21:22 -70.3 Dark Down 64.0 140.4 Up 07:06:22 - 07:36:22 3609
Searchlight/Boulder City 07:21:22 -70.8 Dark Down 64.5 139.7 Up 07:06:22 - 07:36:22 3552
Patrick 07:21:19 -70.9 Dark Down 65.1 141.7 Up 07:06:19 - 07:36:19 3522
Laughlin/Bullhead City 07:21:22 -71.1 Dark Down 64.9 140.0 Up 07:06:22 - 07:36:22 3515
Wildwood 07:21:37 -71.8 Dark Down 63.4 131.4 Up 07:06:37 - 07:36:37 3511
Kingman/Dolan Springs 07:21:20 -71.1 Dark Down 65.2 141.0 Up 07:06:20 - 07:36:20 3504
Mohave Valley 07:21:22 -71.4 Dark Down 65.1 139.6 Up 07:06:22 - 07:36:22 3488
DCO 07:21:17 -71.2 Dark Down 65.7 142.6 Up 07:06:17 - 07:36:17 3475
Lake Havasu City 07:21:22 -71.8 Dark Down 65.6 139.5 Up 07:06:22 - 07:36:22 3443
Idyllwild 07:21:32 -72.5 Dark Down 64.8 134.0 Up 07:06:32 - 07:36:32 3428
Parker 07:21:22 -72.2 Dark Down 65.8 139.1 Up 07:06:22 - 07:36:22 3407
Blythe 07:21:24 -72.7 Dark Down 66.1 137.7 Up 07:06:24 - 07:36:24 3363
Calipatria 07:21:29 -73.2 Dark Down 65.9 135.2 Up 07:06:29 - 07:36:29 3338
George/Scottsdale 07:21:14 -72.4 Dark Down 67.4 143.4 Up 07:06:14 - 07:36:14 3306
Yuma 07:21:26 -73.6 Dark Down 66.7 136.2 Up 07:06:26 - 07:36:26 3272

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 47171, (2026/11/07 07:21UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 10.07 131
Menkar         03:02:16.8 +04:05:21  2.5 16.79 152
PPM 119411     03:51:15.9 +13:02:45  6.2  1.98 142
PPM 119503     03:58:35.2 +15:05:09  8.4  0.98 140
PPM 119446     03:54:03.4 +15:08:29  8.7  0.33 141
PPM 119448     03:54:18.2 +14:39:04 11.9  0.21 141
47171          03:54:40.3 +14:50:43 11.3       141
Positions are for J2000

Event circumstances last updated at 2020/02/29 00:53:35 UT

Marc W. Buie, Southwest Research Institute

RECON