RECON: TNO occultation with 48639

Event between (48639) 95TL8 and star GA1080:00409097 with event index number of 2381520

Geocentric closest approach at 2021/10/24 04:55:15 UTC

J2000 position of star is 03:40:30.2 +19:40:58
Equinox of date position of star is 03:41:45.7 +19:45:07
Stellar brightness G=11.8, use SENSEUP=8 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 13 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 46.2 AU from the Sun and 45.3 AU from the Earth.
The TNO is moving 22.4 km/sec on the sky relative to the star, or, 2.5 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 1688 km.
The sky-plane scale is 32857.3 km/arcsec.

The TNO has an absolute magnitude Hv=4.9
Diameter=622.3 km assuming a 5% albedo -- 27.6 sec chord
Diameter=254.1 km assuming a 30% albedo -- 11.3 sec chord
Dynamical classification is SCATNEAR

Star training set for 48639, (2021/10/24 04:56UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.5 +16:33:05  0.8 13.54   6
44Zet Per      03:55:30.5 +31:56:48  2.8 12.58  13
13 Tau         03:43:34.7 +19:46:07  5.7  0.43  12
PPM 119282     03:42:41.9 +19:27:26  8.3  0.37  13
PPM 119263     03:41:17.1 +19:52:47  9.8  0.17  13
48639          03:41:45.8 +19:45:07 11.8        13
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 18.9 km RECON observability=1.0 and success probability=3.0%

Site Site mid-time
(UT) Sun alt
(deg) Sky Moon Star alt
(deg) Star az
(deg) Target Observing Time
(UT) X-track
(km)

Victoria 04:57:28 -37.7 Dark Up 26.9 90.2 Low 04:48:18 - 05:06:39 -4202

Clarence Fulton 04:57:17 -39.0 Dark Up 29.4 94.2 Low 04:48:07 - 05:06:28 -4215

Peachland 04:57:20 -39.1 Dark Up 29.2 93.6 Low 04:48:10 - 05:06:31 -4232

Kelowna 04:57:19 -39.2 Dark Up 29.4 93.9 Low 04:48:09 - 05:06:30 -4234

Summerland 04:57:21 -39.2 Dark Up 29.3 93.6 Low 04:48:10 - 05:06:31 -4243

Penticton 04:57:21 -39.3 Dark Up 29.3 93.6 Low 04:48:10 - 05:06:31 -4251

Oliver 04:57:22 -39.5 Dark Up 29.4 93.4 Low 04:48:12 - 05:06:33 -4272

Anarchist Mountain Observatory 04:57:23 -39.7 Dark Up 29.5 93.5 Low 04:48:12 - 05:06:33 -4287

Tonasket 04:57:24 -39.8 Dark Up 29.5 93.3 Low 04:48:13 - 05:06:34 -4304

Okanogan 04:57:26 -39.9 Dark Up 29.4 93.0 Low 04:48:15 - 05:06:36 -4320

Brewster 04:57:27 -40.0 Dark Up 29.3 92.7 Low 04:48:16 - 05:06:37 -4331

Manson/Chelan 04:57:28 -39.9 Dark Up 29.0 92.3 Low 04:48:17 - 05:06:38 -4333

Wenatchee 04:57:31 -40.0 Dark Up 29.0 91.9 Low 04:48:20 - 05:06:41 -4358

Ellensburg 04:57:32 -40.1 Dark Up 28.8 91.5 Low 04:48:22 - 05:06:43 -4377

Yakima 04:57:33 -40.3 Dark Up 28.8 91.3 Low 04:48:23 - 05:06:44 -4402

Toppenish/White Swan 04:57:34 -40.5 Dark Up 28.9 91.3 Low 04:48:24 - 05:06:45 -4421

Goldendale 04:57:35 -40.5 Dark Up 28.7 90.7 Low 04:48:24 - 05:06:45 -4444

The Dalles 04:57:35 -40.4 Dark Up 28.4 90.3 Low 04:48:24 - 05:06:45 -4448

Pasco 04:57:33 -41.3 Dark Up 29.8 92.1 Low 04:48:23 - 05:06:44 -4467

Maupin 04:57:35 -40.7 Dark Up 28.5 90.1 Low 04:48:24 - 05:06:45 -4479

PNWRO 04:57:35 -41.6 Dark Up 30.0 92.2 Low 04:48:24 - 05:06:45 -4490

Sisters 04:57:35 -40.8 Dark Up 28.1 89.3 Low 04:48:24 - 05:06:45 -4524

Redmond 04:57:35 -41.1 Dark Up 28.4 89.6 Low 04:48:24 - 05:06:45 -4538

Bend 04:57:35 -41.1 Dark Up 28.3 89.4 Low 04:48:24 - 05:06:45 -4548

Oregon Observatory 04:57:35 -41.1 Dark Up 28.2 89.2 Low 04:48:24 - 05:06:45 -4557

La Pine/Gilchrist 04:57:35 -41.1 Dark Up 28.2 89.0 Low 04:48:24 - 05:06:45 -4570

North Lake 04:57:35 -41.7 Dark Up 28.6 89.2 Low 04:48:24 - 05:06:45 -4619

Chiloquin 04:57:35 -41.4 Dark Up 27.9 88.2 Low 04:48:24 - 05:06:45 -4640

Klamath Falls 04:57:35 -41.6 Dark Up 27.9 88.1 Low 04:48:24 - 05:06:45 -4669

Paisley 04:57:35 -42.2 Dark Up 28.9 89.1 Low 04:48:24 - 05:06:45 -4671

Lakeview 04:57:35 -42.6 Dark Up 29.0 89.0 Low 04:48:24 - 05:06:45 -4714

Cedarville 04:57:35 -43.0 Dark Up 29.1 88.7 Low 04:48:24 - 05:06:45 -4770

Fall River/Burney 04:57:35 -42.4 Dark Up 28.2 87.7 Low 04:48:24 - 05:06:45 -4771

Susanville 04:57:35 -43.2 Dark Up 28.7 87.8 Low 04:48:24 - 05:06:45 -4844

Greenville 04:57:35 -43.1 Dark Up 28.5 87.5 Low 04:48:24 - 05:06:45 -4857

Gimple 04:57:35 -43.1 Dark Up 28.5 87.5 Low 04:48:24 - 05:06:45 -4860

Quincy 04:57:35 -43.2 Dark Up 28.5 87.4 Low 04:48:24 - 05:06:45 -4874

Portola 04:57:35 -43.5 Dark Up 28.8 87.6 Low 04:48:24 - 05:06:45 -4898

Reno 04:57:35 -44.1 Dark Up 29.3 87.9 Low 04:48:24 - 05:06:45 -4940

Carson City 04:57:35 -44.3 Dark Up 29.3 87.7 Low 04:48:24 - 05:06:45 -4970

Gardnerville 04:57:35 -44.4 Dark Up 29.3 87.6 Low 04:48:24 - 05:06:45 -4992

Yerington 04:57:35 -44.8 Dark Up 29.8 88.0 Low 04:48:24 - 05:06:45 -5005

Hawthorne 04:57:35 -45.4 Dark Up 30.2 88.0 Up 04:48:24 - 05:06:45 -5060

Lee Vining 04:57:35 -45.3 Dark Up 29.8 87.4 Low 04:48:24 - 05:06:45 -5093

Bishop 04:58:07 -46.1 Dark Up 30.4 87.6 Up 04:48:56 - 05:07:17 -5117

Tonopah 04:57:35 -46.6 Dark Up 31.3 88.6 Up 04:48:24 - 05:06:45 -5143

CPSLO 04:58:17 -45.3 Dark Up 28.5 85.1 Low 04:49:06 - 05:07:27 -5197

Beatty 04:58:05 -47.5 Dark Up 31.7 88.2 Up 04:48:55 - 05:07:16 -5210

Indian Springs 04:57:35 -48.3 Dark Up 32.5 88.6 Up 04:48:24 - 05:06:45 -5319

Henderson 04:58:06 -49.2 Dark Up 33.1 88.7 Up 04:48:56 - 05:07:17 -5340

Dunrhomin 04:57:35 -53.0 Dark Up 40.5 98.2 Up 04:48:24 - 05:06:45 -5345

Wildwood 04:58:18 -47.3 Dark Up 30.1 85.6 Up 04:49:08 - 05:07:29 -5366

Laughlin/Bullhead City 04:58:08 -49.9 Dark Up 33.5 88.4 Up 04:48:58 - 05:07:19 -5424

Patrick 04:58:06 -50.3 Dark Up 34.0 88.9 Up 04:48:56 - 05:07:17 -5430

Kingman/Dolan Springs 04:58:08 -50.2 Dark Up 33.9 88.7 Up 04:48:57 - 05:07:18 -5441

Mohave Valley 04:58:10 -50.0 Dark Up 33.5 88.2 Up 04:48:59 - 05:07:20 -5447

Idyllwild 04:58:17 -48.9 Dark Up 31.7 86.3 Up 04:49:06 - 05:07:27 -5462

Lake Havasu City 04:58:10 -50.4 Dark Up 33.7 88.1 Up 04:49:00 - 05:07:21 -5488

Parker 04:58:12 -50.5 Dark Up 33.7 87.9 Up 04:49:01 - 05:07:22 -5518

Blythe 04:58:14 -50.6 Dark Up 33.4 87.4 Up 04:49:03 - 05:07:24 -5550

Calipatria 04:58:17 -50.1 Dark Up 32.6 86.6 Up 04:49:06 - 05:07:27 -5556

Yuma 04:58:17 -50.9 Dark Up 33.3 86.7 Up 04:49:06 - 05:07:27 -5625

George/Scottsdale 04:58:09 -52.5 Dark Up 35.7 88.9 Up 04:48:58 - 05:07:19 -5642

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 48639, (2021/10/24 04:56UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 13.54   6
44Zet Per      03:54:07.9 +31:53:01  2.8 12.58  13
13 Tau         03:42:18.9 +19:42:01  5.7  0.43  12
PPM 119282     03:41:26.4 +19:23:19  8.3  0.37  13
PPM 119263     03:40:01.4 +19:48:38  9.8  0.17  13
48639          03:40:30.2 +19:40:58 11.8        13
Positions are for J2000

Event circumstances last updated at 2021/10/11 01:41:31 UT

Marc W. Buie, Southwest Research Institute

RECON

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Victoria	04:57:28	-37.7	Dark	Up	26.9	90.2	Low	04:48:18 - 05:06:39	-4202
Clarence Fulton	04:57:17	-39.0	Dark	Up	29.4	94.2	Low	04:48:07 - 05:06:28	-4215
Peachland	04:57:20	-39.1	Dark	Up	29.2	93.6	Low	04:48:10 - 05:06:31	-4232
Kelowna	04:57:19	-39.2	Dark	Up	29.4	93.9	Low	04:48:09 - 05:06:30	-4234
Summerland	04:57:21	-39.2	Dark	Up	29.3	93.6	Low	04:48:10 - 05:06:31	-4243
Penticton	04:57:21	-39.3	Dark	Up	29.3	93.6	Low	04:48:10 - 05:06:31	-4251
Oliver	04:57:22	-39.5	Dark	Up	29.4	93.4	Low	04:48:12 - 05:06:33	-4272
Anarchist Mountain Observatory	04:57:23	-39.7	Dark	Up	29.5	93.5	Low	04:48:12 - 05:06:33	-4287
Tonasket	04:57:24	-39.8	Dark	Up	29.5	93.3	Low	04:48:13 - 05:06:34	-4304
Okanogan	04:57:26	-39.9	Dark	Up	29.4	93.0	Low	04:48:15 - 05:06:36	-4320
Brewster	04:57:27	-40.0	Dark	Up	29.3	92.7	Low	04:48:16 - 05:06:37	-4331
Manson/Chelan	04:57:28	-39.9	Dark	Up	29.0	92.3	Low	04:48:17 - 05:06:38	-4333
Wenatchee	04:57:31	-40.0	Dark	Up	29.0	91.9	Low	04:48:20 - 05:06:41	-4358
Ellensburg	04:57:32	-40.1	Dark	Up	28.8	91.5	Low	04:48:22 - 05:06:43	-4377
Yakima	04:57:33	-40.3	Dark	Up	28.8	91.3	Low	04:48:23 - 05:06:44	-4402
Toppenish/White Swan	04:57:34	-40.5	Dark	Up	28.9	91.3	Low	04:48:24 - 05:06:45	-4421
Goldendale	04:57:35	-40.5	Dark	Up	28.7	90.7	Low	04:48:24 - 05:06:45	-4444
The Dalles	04:57:35	-40.4	Dark	Up	28.4	90.3	Low	04:48:24 - 05:06:45	-4448
Pasco	04:57:33	-41.3	Dark	Up	29.8	92.1	Low	04:48:23 - 05:06:44	-4467
Maupin	04:57:35	-40.7	Dark	Up	28.5	90.1	Low	04:48:24 - 05:06:45	-4479
PNWRO	04:57:35	-41.6	Dark	Up	30.0	92.2	Low	04:48:24 - 05:06:45	-4490
Sisters	04:57:35	-40.8	Dark	Up	28.1	89.3	Low	04:48:24 - 05:06:45	-4524
Redmond	04:57:35	-41.1	Dark	Up	28.4	89.6	Low	04:48:24 - 05:06:45	-4538
Bend	04:57:35	-41.1	Dark	Up	28.3	89.4	Low	04:48:24 - 05:06:45	-4548
Oregon Observatory	04:57:35	-41.1	Dark	Up	28.2	89.2	Low	04:48:24 - 05:06:45	-4557
La Pine/Gilchrist	04:57:35	-41.1	Dark	Up	28.2	89.0	Low	04:48:24 - 05:06:45	-4570
North Lake	04:57:35	-41.7	Dark	Up	28.6	89.2	Low	04:48:24 - 05:06:45	-4619
Chiloquin	04:57:35	-41.4	Dark	Up	27.9	88.2	Low	04:48:24 - 05:06:45	-4640
Klamath Falls	04:57:35	-41.6	Dark	Up	27.9	88.1	Low	04:48:24 - 05:06:45	-4669
Paisley	04:57:35	-42.2	Dark	Up	28.9	89.1	Low	04:48:24 - 05:06:45	-4671
Lakeview	04:57:35	-42.6	Dark	Up	29.0	89.0	Low	04:48:24 - 05:06:45	-4714
Cedarville	04:57:35	-43.0	Dark	Up	29.1	88.7	Low	04:48:24 - 05:06:45	-4770
Fall River/Burney	04:57:35	-42.4	Dark	Up	28.2	87.7	Low	04:48:24 - 05:06:45	-4771
Susanville	04:57:35	-43.2	Dark	Up	28.7	87.8	Low	04:48:24 - 05:06:45	-4844
Greenville	04:57:35	-43.1	Dark	Up	28.5	87.5	Low	04:48:24 - 05:06:45	-4857
Gimple	04:57:35	-43.1	Dark	Up	28.5	87.5	Low	04:48:24 - 05:06:45	-4860
Quincy	04:57:35	-43.2	Dark	Up	28.5	87.4	Low	04:48:24 - 05:06:45	-4874
Portola	04:57:35	-43.5	Dark	Up	28.8	87.6	Low	04:48:24 - 05:06:45	-4898
Reno	04:57:35	-44.1	Dark	Up	29.3	87.9	Low	04:48:24 - 05:06:45	-4940
Carson City	04:57:35	-44.3	Dark	Up	29.3	87.7	Low	04:48:24 - 05:06:45	-4970
Gardnerville	04:57:35	-44.4	Dark	Up	29.3	87.6	Low	04:48:24 - 05:06:45	-4992
Yerington	04:57:35	-44.8	Dark	Up	29.8	88.0	Low	04:48:24 - 05:06:45	-5005
Hawthorne	04:57:35	-45.4	Dark	Up	30.2	88.0	Up	04:48:24 - 05:06:45	-5060
Lee Vining	04:57:35	-45.3	Dark	Up	29.8	87.4	Low	04:48:24 - 05:06:45	-5093
Bishop	04:58:07	-46.1	Dark	Up	30.4	87.6	Up	04:48:56 - 05:07:17	-5117
Tonopah	04:57:35	-46.6	Dark	Up	31.3	88.6	Up	04:48:24 - 05:06:45	-5143
CPSLO	04:58:17	-45.3	Dark	Up	28.5	85.1	Low	04:49:06 - 05:07:27	-5197
Beatty	04:58:05	-47.5	Dark	Up	31.7	88.2	Up	04:48:55 - 05:07:16	-5210
Indian Springs	04:57:35	-48.3	Dark	Up	32.5	88.6	Up	04:48:24 - 05:06:45	-5319
Henderson	04:58:06	-49.2	Dark	Up	33.1	88.7	Up	04:48:56 - 05:07:17	-5340
Dunrhomin	04:57:35	-53.0	Dark	Up	40.5	98.2	Up	04:48:24 - 05:06:45	-5345
Wildwood	04:58:18	-47.3	Dark	Up	30.1	85.6	Up	04:49:08 - 05:07:29	-5366
Laughlin/Bullhead City	04:58:08	-49.9	Dark	Up	33.5	88.4	Up	04:48:58 - 05:07:19	-5424
Patrick	04:58:06	-50.3	Dark	Up	34.0	88.9	Up	04:48:56 - 05:07:17	-5430
Kingman/Dolan Springs	04:58:08	-50.2	Dark	Up	33.9	88.7	Up	04:48:57 - 05:07:18	-5441
Mohave Valley	04:58:10	-50.0	Dark	Up	33.5	88.2	Up	04:48:59 - 05:07:20	-5447
Idyllwild	04:58:17	-48.9	Dark	Up	31.7	86.3	Up	04:49:06 - 05:07:27	-5462
Lake Havasu City	04:58:10	-50.4	Dark	Up	33.7	88.1	Up	04:49:00 - 05:07:21	-5488
Parker	04:58:12	-50.5	Dark	Up	33.7	87.9	Up	04:49:01 - 05:07:22	-5518
Blythe	04:58:14	-50.6	Dark	Up	33.4	87.4	Up	04:49:03 - 05:07:24	-5550
Calipatria	04:58:17	-50.1	Dark	Up	32.6	86.6	Up	04:49:06 - 05:07:27	-5556
Yuma	04:58:17	-50.9	Dark	Up	33.3	86.7	Up	04:49:06 - 05:07:27	-5625
George/Scottsdale	04:58:09	-52.5	Dark	Up	35.7	88.9	Up	04:48:58 - 05:07:19	-5642