RECON: TNO occultation with 69987

Event between (69987) 98WA25 and star GA1120:01101978 with event index number of 1116958

Geocentric closest approach at 2021/11/06 05:47:44 UTC

J2000 position of star is 05:19:26.9 +22:13:11
Equinox of date position of star is 05:20:45.6 +22:14:26
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 162 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=23.4

[RECON map]
TNO is 42.5 AU from the Sun and 41.7 AU from the Earth.
The TNO is moving 19.7 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 507 seconds.
The 1-sigma cross-track error in the shadow position is 2273 km.
The sky-plane scale is 30223.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 11.6 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.7 sec chord
Dynamical classification is CLASSICAL

Star training set for 69987, (2021/11/06 05:48UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.6 +16:33:05  0.8 11.74 171
Alnath         05:27:40.5 +28:37:26  1.6  6.57 160
109 Tau        05:20:35.5 +22:07:02  4.9  0.13 162
PPM 094251     05:19:50.2 +21:48:50  7.8  0.48 163
109 Tau        05:20:35.5 +22:07:02  4.9  0.13 162
69987          05:20:45.9 +22:14:27 16.1       162
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 1.8 sigma about the mid-time.
The median site spacing is 21.7 km RECON observability=1.0 and success probability=6.1%

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

Victoria 05:50:48 -48.5 Dark Down 29.6 89.2 Low 05:35:48 - 06:05:48 -4161

Peachland 05:50:39 -49.4 Dark Down 31.9 92.7 Up 05:35:39 - 06:05:39 -4172

Summerland 05:50:39 -49.5 Dark Down 32.0 92.7 Up 05:35:39 - 06:05:39 -4186

Clarence Fulton 05:50:07 -49.2 Dark Down 32.1 93.3 Up 05:35:07 - 06:05:07 -4186

Penticton 05:50:39 -49.6 Dark Down 32.1 92.7 Up 05:35:39 - 06:05:39 -4194

Kelowna 05:50:07 -49.4 Dark Down 32.0 92.9 Up 05:35:07 - 06:05:07 -4216

Oliver 05:50:41 -49.9 Dark Down 32.1 92.5 Up 05:35:41 - 06:05:41 -4220

Anarchist Mountain Observatory 05:50:41 -50.1 Dark Down 32.2 92.5 Up 05:35:41 - 06:05:41 -4237

Tonasket 05:50:43 -50.3 Dark Down 32.2 92.3 Up 05:35:43 - 06:05:43 -4259

Okanogan 05:50:44 -50.5 Dark Down 32.1 92.0 Up 05:35:44 - 06:05:44 -4280

Brewster 05:50:46 -50.6 Dark Down 32.0 91.7 Up 05:35:46 - 06:05:46 -4295

Manson/Chelan 05:50:48 -50.6 Dark Down 31.8 91.3 Up 05:35:48 - 06:05:48 -4300

Wenatchee 05:50:49 -50.8 Dark Down 31.7 90.8 Up 05:35:49 - 06:05:49 -4331

Ellensburg 05:50:51 -51.0 Dark Down 31.5 90.4 Up 05:35:51 - 06:05:51 -4356

Yakima 05:50:53 -51.3 Dark Down 31.5 90.2 Up 05:35:53 - 06:05:53 -4387

Toppenish/White Swan 05:50:53 -51.5 Dark Down 31.7 90.2 Up 05:35:53 - 06:05:53 -4409

Goldendale 05:50:57 -51.6 Dark Down 31.4 89.5 Up 05:35:57 - 06:05:57 -4439

The Dalles 05:50:58 -51.6 Dark Down 31.1 89.1 Up 05:35:58 - 06:05:58 -4446

Pasco 05:50:52 -52.2 Dark Down 32.5 91.0 Up 05:35:52 - 06:05:52 -4455

PNWRO 05:50:53 -52.5 Dark Down 32.7 91.0 Up 05:35:53 - 06:05:53 -4481

Maupin 05:50:59 -51.9 Dark Down 31.2 89.0 Up 05:35:59 - 06:05:59 -4481

Sisters 05:51:03 -52.2 Dark Down 30.8 88.1 Up 05:36:03 - 06:06:03 -4535

Redmond 05:51:03 -52.5 Dark Down 31.1 88.4 Up 05:36:03 - 06:06:03 -4549

Bend 05:51:04 -52.5 Dark Down 31.0 88.1 Up 05:36:04 - 06:06:04 -4562

Oregon Observatory 05:51:04 -52.6 Dark Down 30.9 87.9 Up 05:36:04 - 06:06:04 -4572

La Pine/Gilchrist 05:51:06 -52.7 Dark Down 30.9 87.8 Up 05:36:06 - 06:06:06 -4586

North Lake 05:51:06 -53.3 Dark Down 31.3 87.9 Up 05:36:06 - 06:06:06 -4640

Chiloquin 05:51:11 -53.1 Dark Down 30.6 86.9 Up 05:36:11 - 06:06:11 -4665

Klamath Falls 05:51:12 -53.4 Dark Down 30.6 86.8 Up 05:36:12 - 06:06:12 -4695

Paisley 05:51:08 -53.8 Dark Down 31.5 87.8 Up 05:36:08 - 06:06:08 -4695

Lakeview 05:51:10 -54.3 Dark Down 31.7 87.7 Up 05:36:10 - 06:06:10 -4743

Cedarville 05:51:12 -54.8 Dark Down 31.8 87.4 Up 05:36:12 - 06:06:12 -4802

Fall River/Burney 05:51:16 -54.3 Dark Down 30.8 86.3 Up 05:36:16 - 06:06:16 -4804

Susanville 05:51:16 -55.2 Dark Down 31.4 86.4 Up 05:36:16 - 06:06:16 -4880

Greenville 05:51:18 -55.1 Dark Down 31.1 86.1 Up 05:36:18 - 06:06:18 -4893

Gimple 05:51:18 -55.2 Dark Down 31.2 86.1 Up 05:36:18 - 06:06:18 -4896

Quincy 05:51:19 -55.3 Dark Down 31.1 85.9 Up 05:36:19 - 06:06:19 -4911

Portola 05:51:19 -55.6 Dark Down 31.5 86.2 Up 05:36:19 - 06:06:19 -4936

Reno 05:51:19 -56.2 Dark Down 31.9 86.4 Up 05:36:19 - 06:06:19 -4980

Carson City 05:51:20 -56.4 Dark Down 31.9 86.2 Up 05:36:20 - 06:06:20 -5011

Gardnerville 05:51:20 -56.6 Dark Down 32.0 86.1 Up 05:36:20 - 06:06:20 -5034

Yerington 05:51:18 -56.9 Dark Down 32.4 86.4 Up 05:36:18 - 06:06:18 -5049

Hawthorne 05:51:20 -57.6 Dark Down 32.8 86.5 Up 05:36:20 - 06:06:20 -5106

Lee Vining 05:51:23 -57.6 Dark Down 32.4 85.8 Up 05:36:23 - 06:06:23 -5138

Tonopah 05:51:18 -58.7 Dark Down 33.9 87.0 Up 05:36:18 - 06:06:18 -5192

Bishop 05:51:23 -58.4 Dark Down 32.9 85.8 Up 05:36:23 - 06:06:23 -5215

Beatty 05:51:22 -59.7 Dark Down 34.2 86.5 Up 05:36:22 - 06:06:22 -5310

CPSLO 05:51:33 -58.0 Dark Down 30.9 83.4 Up 05:36:33 - 06:06:33 -5321

Dunrhomin 05:50:46 -63.2 Dark Down 43.1 96.5 Up 05:35:46 - 06:05:46 -5370

Indian Springs 05:51:21 -60.6 Dark Down 35.0 86.9 Up 05:36:21 - 06:06:21 -5375

Henderson 05:51:22 -61.4 Dark Down 35.6 86.9 Up 05:36:22 - 06:06:22 -5446

Wildwood 05:51:35 -60.1 Dark Down 32.5 83.7 Up 05:36:35 - 06:06:35 -5500

Laughlin/Bullhead City 05:51:24 -62.2 Dark Down 35.9 86.5 Up 05:36:24 - 06:06:24 -5539

Patrick 05:51:22 -62.5 Dark Down 36.4 87.0 Up 05:36:22 - 06:06:22 -5540

Kingman/Dolan Springs 05:51:22 -62.5 Dark Down 36.3 86.8 Up 05:36:22 - 06:06:22 -5554

Mohave Valley 05:51:24 -62.3 Dark Down 35.8 86.3 Up 05:36:24 - 06:06:24 -5564

Idyllwild 05:51:32 -61.6 Dark Down 34.0 84.4 Up 05:36:32 - 06:06:32 -5597

Lake Havasu City 05:51:25 -62.8 Dark Down 36.0 86.1 Up 05:36:25 - 06:06:25 -5609

Parker 05:51:26 -63.0 Dark Down 36.0 85.9 Up 05:36:26 - 06:06:26 -5643

Blythe 05:51:28 -63.1 Dark Down 35.7 85.4 Up 05:36:28 - 06:06:28 -5681

Calipatria 05:51:31 -62.7 Dark Down 34.9 84.5 Up 05:36:31 - 06:06:31 -5695

George/Scottsdale 05:51:22 -64.8 Dark Down 38.0 86.8 Up 05:36:22 - 06:06:22 -5764

Yuma 05:51:32 -63.6 Dark Down 35.6 84.7 Up 05:36:32 - 06:06:32 -5766

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 69987, (2021/11/06 05:48UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 11.74 171
Alnath         05:26:17.5 +28:36:23  1.6  6.57 160
109 Tau        05:19:16.6 +22:05:46  4.9  0.13 162
PPM 094251     05:18:31.6 +21:47:33  7.8  0.48 163
109 Tau        05:19:16.6 +22:05:46  4.9  0.13 162
69987          05:19:26.9 +22:13:11 16.1       162
Positions are for J2000

Event circumstances last updated at 2021/10/12 02:01:13 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	05:50:48	-48.5	Dark	Down	29.6	89.2	Low	05:35:48 - 06:05:48	-4161
Peachland	05:50:39	-49.4	Dark	Down	31.9	92.7	Up	05:35:39 - 06:05:39	-4172
Summerland	05:50:39	-49.5	Dark	Down	32.0	92.7	Up	05:35:39 - 06:05:39	-4186
Clarence Fulton	05:50:07	-49.2	Dark	Down	32.1	93.3	Up	05:35:07 - 06:05:07	-4186
Penticton	05:50:39	-49.6	Dark	Down	32.1	92.7	Up	05:35:39 - 06:05:39	-4194
Kelowna	05:50:07	-49.4	Dark	Down	32.0	92.9	Up	05:35:07 - 06:05:07	-4216
Oliver	05:50:41	-49.9	Dark	Down	32.1	92.5	Up	05:35:41 - 06:05:41	-4220
Anarchist Mountain Observatory	05:50:41	-50.1	Dark	Down	32.2	92.5	Up	05:35:41 - 06:05:41	-4237
Tonasket	05:50:43	-50.3	Dark	Down	32.2	92.3	Up	05:35:43 - 06:05:43	-4259
Okanogan	05:50:44	-50.5	Dark	Down	32.1	92.0	Up	05:35:44 - 06:05:44	-4280
Brewster	05:50:46	-50.6	Dark	Down	32.0	91.7	Up	05:35:46 - 06:05:46	-4295
Manson/Chelan	05:50:48	-50.6	Dark	Down	31.8	91.3	Up	05:35:48 - 06:05:48	-4300
Wenatchee	05:50:49	-50.8	Dark	Down	31.7	90.8	Up	05:35:49 - 06:05:49	-4331
Ellensburg	05:50:51	-51.0	Dark	Down	31.5	90.4	Up	05:35:51 - 06:05:51	-4356
Yakima	05:50:53	-51.3	Dark	Down	31.5	90.2	Up	05:35:53 - 06:05:53	-4387
Toppenish/White Swan	05:50:53	-51.5	Dark	Down	31.7	90.2	Up	05:35:53 - 06:05:53	-4409
Goldendale	05:50:57	-51.6	Dark	Down	31.4	89.5	Up	05:35:57 - 06:05:57	-4439
The Dalles	05:50:58	-51.6	Dark	Down	31.1	89.1	Up	05:35:58 - 06:05:58	-4446
Pasco	05:50:52	-52.2	Dark	Down	32.5	91.0	Up	05:35:52 - 06:05:52	-4455
PNWRO	05:50:53	-52.5	Dark	Down	32.7	91.0	Up	05:35:53 - 06:05:53	-4481
Maupin	05:50:59	-51.9	Dark	Down	31.2	89.0	Up	05:35:59 - 06:05:59	-4481
Sisters	05:51:03	-52.2	Dark	Down	30.8	88.1	Up	05:36:03 - 06:06:03	-4535
Redmond	05:51:03	-52.5	Dark	Down	31.1	88.4	Up	05:36:03 - 06:06:03	-4549
Bend	05:51:04	-52.5	Dark	Down	31.0	88.1	Up	05:36:04 - 06:06:04	-4562
Oregon Observatory	05:51:04	-52.6	Dark	Down	30.9	87.9	Up	05:36:04 - 06:06:04	-4572
La Pine/Gilchrist	05:51:06	-52.7	Dark	Down	30.9	87.8	Up	05:36:06 - 06:06:06	-4586
North Lake	05:51:06	-53.3	Dark	Down	31.3	87.9	Up	05:36:06 - 06:06:06	-4640
Chiloquin	05:51:11	-53.1	Dark	Down	30.6	86.9	Up	05:36:11 - 06:06:11	-4665
Klamath Falls	05:51:12	-53.4	Dark	Down	30.6	86.8	Up	05:36:12 - 06:06:12	-4695
Paisley	05:51:08	-53.8	Dark	Down	31.5	87.8	Up	05:36:08 - 06:06:08	-4695
Lakeview	05:51:10	-54.3	Dark	Down	31.7	87.7	Up	05:36:10 - 06:06:10	-4743
Cedarville	05:51:12	-54.8	Dark	Down	31.8	87.4	Up	05:36:12 - 06:06:12	-4802
Fall River/Burney	05:51:16	-54.3	Dark	Down	30.8	86.3	Up	05:36:16 - 06:06:16	-4804
Susanville	05:51:16	-55.2	Dark	Down	31.4	86.4	Up	05:36:16 - 06:06:16	-4880
Greenville	05:51:18	-55.1	Dark	Down	31.1	86.1	Up	05:36:18 - 06:06:18	-4893
Gimple	05:51:18	-55.2	Dark	Down	31.2	86.1	Up	05:36:18 - 06:06:18	-4896
Quincy	05:51:19	-55.3	Dark	Down	31.1	85.9	Up	05:36:19 - 06:06:19	-4911
Portola	05:51:19	-55.6	Dark	Down	31.5	86.2	Up	05:36:19 - 06:06:19	-4936
Reno	05:51:19	-56.2	Dark	Down	31.9	86.4	Up	05:36:19 - 06:06:19	-4980
Carson City	05:51:20	-56.4	Dark	Down	31.9	86.2	Up	05:36:20 - 06:06:20	-5011
Gardnerville	05:51:20	-56.6	Dark	Down	32.0	86.1	Up	05:36:20 - 06:06:20	-5034
Yerington	05:51:18	-56.9	Dark	Down	32.4	86.4	Up	05:36:18 - 06:06:18	-5049
Hawthorne	05:51:20	-57.6	Dark	Down	32.8	86.5	Up	05:36:20 - 06:06:20	-5106
Lee Vining	05:51:23	-57.6	Dark	Down	32.4	85.8	Up	05:36:23 - 06:06:23	-5138
Tonopah	05:51:18	-58.7	Dark	Down	33.9	87.0	Up	05:36:18 - 06:06:18	-5192
Bishop	05:51:23	-58.4	Dark	Down	32.9	85.8	Up	05:36:23 - 06:06:23	-5215
Beatty	05:51:22	-59.7	Dark	Down	34.2	86.5	Up	05:36:22 - 06:06:22	-5310
CPSLO	05:51:33	-58.0	Dark	Down	30.9	83.4	Up	05:36:33 - 06:06:33	-5321
Dunrhomin	05:50:46	-63.2	Dark	Down	43.1	96.5	Up	05:35:46 - 06:05:46	-5370
Indian Springs	05:51:21	-60.6	Dark	Down	35.0	86.9	Up	05:36:21 - 06:06:21	-5375
Henderson	05:51:22	-61.4	Dark	Down	35.6	86.9	Up	05:36:22 - 06:06:22	-5446
Wildwood	05:51:35	-60.1	Dark	Down	32.5	83.7	Up	05:36:35 - 06:06:35	-5500
Laughlin/Bullhead City	05:51:24	-62.2	Dark	Down	35.9	86.5	Up	05:36:24 - 06:06:24	-5539
Patrick	05:51:22	-62.5	Dark	Down	36.4	87.0	Up	05:36:22 - 06:06:22	-5540
Kingman/Dolan Springs	05:51:22	-62.5	Dark	Down	36.3	86.8	Up	05:36:22 - 06:06:22	-5554
Mohave Valley	05:51:24	-62.3	Dark	Down	35.8	86.3	Up	05:36:24 - 06:06:24	-5564
Idyllwild	05:51:32	-61.6	Dark	Down	34.0	84.4	Up	05:36:32 - 06:06:32	-5597
Lake Havasu City	05:51:25	-62.8	Dark	Down	36.0	86.1	Up	05:36:25 - 06:06:25	-5609
Parker	05:51:26	-63.0	Dark	Down	36.0	85.9	Up	05:36:26 - 06:06:26	-5643
Blythe	05:51:28	-63.1	Dark	Down	35.7	85.4	Up	05:36:28 - 06:06:28	-5681
Calipatria	05:51:31	-62.7	Dark	Down	34.9	84.5	Up	05:36:31 - 06:06:31	-5695
George/Scottsdale	05:51:22	-64.8	Dark	Down	38.0	86.8	Up	05:36:22 - 06:06:22	-5764
Yuma	05:51:32	-63.6	Dark	Down	35.6	84.7	Up	05:36:32 - 06:06:32	-5766