RECON: TNO occultation with 19521

Event between (19521) Chaos and star GA1200:01828906 with event index number of 1035569

Geocentric closest approach at 2021/01/20 05:45:46 UTC

J2000 position of star is 05:42:12.6 +30:49:54
Equinox of date position of star is 05:43:34.1 +30:50:25
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 64 degrees from the moon. Moon is 44% illuminated.
TNO apparent brightness V=21.0

[RECON map]
TNO is 41.2 AU from the Sun and 40.4 AU from the Earth.
The TNO is moving 20.4 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 277 seconds.
The 1-sigma cross-track error in the shadow position is 2248 km.
The sky-plane scale is 29309.3 km/arcsec.

The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 32.3 sec chord
Diameter=269.7 km assuming a 30% albedo -- 13.2 sec chord
Dynamical classification is CLASSICAL

Star training set for 19521, (2021/01/20 05:46UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:07.9 +16:33:00  0.8 20.82  46
Alnath         05:27:37.5 +28:37:24  1.6  4.11  60
PPM 070700     05:41:57.7 +31:22:04  5.9  0.63  63
PPM 070716     05:42:41.6 +31:11:43  7.7  0.40  64
PPM 070754     05:44:24.1 +30:54:40  9.6  0.19  64
19521          05:43:34.1 +30:50:25 16.1        64
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 3.2 sigma about the mid-time.
The median site spacing is 27.6 km RECON observability=1.0 and success probability=4.6%

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 05:45:33 -48.7 Dark Up 70.6 183.5 Up 05:30:33 - 06:00:33 6831

Kelowna 05:45:35 -48.9 Dark Up 70.9 183.2 Up 05:30:35 - 06:00:35 6791

Peachland 05:45:35 -48.8 Dark Up 71.1 182.4 Up 05:30:35 - 06:00:35 6781

Summerland 05:45:35 -48.9 Dark Up 71.2 182.7 Up 05:30:35 - 06:00:35 6765

Penticton 05:45:35 -49.0 Dark Up 71.3 183.0 Up 05:30:35 - 06:00:35 6757

Oliver 05:45:35 -49.2 Dark Up 71.6 183.0 Up 05:30:35 - 06:00:35 6720

Anarchist Mountain Observatory 05:45:35 -49.4 Dark Up 71.8 183.6 Up 05:30:35 - 06:00:35 6701

Victoria 05:45:49 -47.4 Dark Up 72.2 172.4 Up 05:30:49 - 06:00:49 6680

Tonasket 05:45:35 -49.5 Dark Up 72.1 183.5 Up 05:30:35 - 06:00:35 6669

Okanogan 05:45:35 -49.6 Dark Up 72.4 183.1 Up 05:30:35 - 06:00:35 6634

Brewster 05:45:36 -49.6 Dark Up 72.7 182.6 Up 05:30:36 - 06:00:36 6607

Manson/Chelan 05:45:37 -49.5 Dark Up 72.9 181.5 Up 05:30:37 - 06:00:37 6587

Wenatchee 05:45:39 -49.7 Dark Up 73.4 181.1 Up 05:30:39 - 06:00:39 6538

Ellensburg 05:45:39 -49.8 Dark Up 73.8 180.4 Up 05:30:39 - 06:00:39 6496

Yakima 05:45:40 -49.9 Dark Up 74.2 180.4 Up 05:30:40 - 06:00:40 6453

Toppenish/White Swan 05:45:40 -50.2 Dark Up 74.5 181.0 Up 05:30:40 - 06:00:40 6429

Pasco 05:45:35 -51.0 Dark Up 74.5 185.0 Up 05:30:35 - 06:00:35 6407

PNWRO 05:45:33 -51.2 Dark Up 74.8 185.8 Up 05:30:33 - 06:00:33 6379

Goldendale 05:45:41 -50.2 Dark Up 75.0 179.6 Up 05:30:41 - 06:00:41 6373

The Dalles 05:45:43 -50.0 Dark Up 75.2 178.4 Up 05:30:43 - 06:00:43 6352

Maupin 05:45:42 -50.3 Dark Up 75.7 178.7 Up 05:30:42 - 06:00:42 6306

Sisters 05:45:45 -50.4 Dark Up 76.5 176.8 Up 05:30:45 - 06:00:45 6216

Redmond 05:45:43 -50.6 Dark Up 76.6 178.3 Up 05:30:43 - 06:00:43 6210

Bend 05:45:44 -50.6 Dark Up 76.8 177.7 Up 05:30:44 - 06:00:44 6188

Oregon Observatory 05:45:45 -50.6 Dark Up 76.9 177.2 Up 05:30:45 - 06:00:45 6170

La Pine/Gilchrist 05:45:45 -50.7 Dark Up 77.1 177.0 Up 05:30:45 - 06:00:45 6149

North Lake 05:45:43 -51.3 Dark Up 77.6 179.2 Up 05:30:43 - 06:00:43 6097

Paisley 05:45:42 -51.7 Dark Up 78.1 180.7 Up 05:30:42 - 06:00:42 6034

Klamath Falls 05:45:47 -51.1 Dark Up 78.6 175.4 Up 05:30:47 - 06:00:47 5994

Lakeview 05:45:41 -52.1 Dark Up 78.6 181.5 Up 05:30:41 - 06:00:41 5978

Cedarville 05:45:41 -52.4 Dark Up 79.3 182.4 Up 05:30:41 - 06:00:41 5905

Fall River/Burney 05:45:46 -51.8 Dark Up 79.8 176.7 Up 05:30:46 - 06:00:46 5863

Susanville 05:45:44 -52.5 Dark Up 80.4 180.3 Up 05:30:44 - 06:00:44 5788

Greenville 05:45:44 -52.4 Dark Up 80.7 178.7 Up 05:30:44 - 06:00:44 5760

Gimple 05:45:45 -52.5 Dark Up 80.7 179.2 Up 05:30:45 - 06:00:45 5759

Quincy 05:45:44 -52.5 Dark Up 80.9 178.7 Up 05:30:44 - 06:00:44 5738

Dunrhomin 05:44:40 -62.6 Dark Up 74.4 237.5 Up 05:29:40 - 05:59:40 5732

Portola 05:45:43 -52.9 Dark Up 81.0 181.3 Up 05:30:43 - 06:00:43 5720

Reno 05:45:40 -53.4 Dark Up 81.3 185.0 Up 05:30:40 - 06:00:40 5686

Carson City 05:45:40 -53.6 Dark Up 81.6 185.3 Up 05:30:40 - 06:00:40 5647

Yerington 05:45:38 -54.1 Dark Up 81.7 189.2 Up 05:30:38 - 06:00:38 5621

Gardnerville 05:45:40 -53.7 Dark Up 81.9 185.8 Up 05:30:40 - 06:00:40 5620

Hawthorne 05:45:35 -54.7 Dark Up 82.1 192.9 Up 05:30:35 - 06:00:35 5566

Lee Vining 05:45:38 -54.5 Dark Up 82.8 190.7 Up 05:30:38 - 06:00:38 5508

Tonopah 05:45:30 -55.9 Dark Up 82.2 202.4 Up 05:30:30 - 06:00:30 5506

Bishop 05:45:36 -55.3 Dark Up 83.2 196.8 Up 05:30:36 - 06:00:36 5437

Beatty 05:45:28 -56.6 Dark Up 83.1 209.1 Up 05:30:28 - 06:00:28 5376

Indian Springs 05:45:24 -57.5 Dark Up 82.9 217.1 Up 05:30:24 - 06:00:24 5334

Henderson 05:45:21 -58.2 Dark Up 83.0 223.7 Up 05:30:21 - 06:00:21 5272

CPSLO 05:45:47 -54.2 Dark Up 85.5 180.7 Up 05:30:47 - 06:00:47 5228

Patrick 05:45:16 -59.3 Dark Up 82.7 232.8 Up 05:30:16 - 06:00:16 5198

Kingman/Dolan Springs 05:45:17 -59.2 Dark Up 83.0 233.4 Up 05:30:17 - 06:00:17 5174

Laughlin/Bullhead City 05:45:19 -58.9 Dark Up 83.3 231.1 Up 05:30:19 - 06:00:19 5174

Mohave Valley 05:45:19 -59.0 Dark Up 83.5 233.0 Up 05:30:19 - 06:00:19 5144

Lake Havasu City 05:45:18 -59.3 Dark Up 83.6 237.0 Up 05:30:18 - 06:00:18 5098

Wildwood 05:45:37 -56.1 Dark Up 86.3 208.9 Up 05:30:37 - 06:00:37 5078

Parker 05:45:18 -59.4 Dark Up 83.7 239.9 Up 05:30:18 - 06:00:18 5059

Idyllwild 05:45:29 -57.7 Dark Up 85.6 230.0 Up 05:30:29 - 06:00:29 5026

George/Scottsdale 05:45:08 -61.4 Dark Up 82.1 251.0 Up 05:30:08 - 06:00:08 5005

Blythe 05:45:20 -59.4 Dark Up 84.2 243.0 Up 05:30:20 - 06:00:20 5002

Calipatria 05:45:24 -58.8 Dark Up 85.1 243.5 Up 05:30:24 - 06:00:24 4952

Yuma 05:45:20 -59.6 Dark Up 84.6 251.5 Up 05:30:20 - 06:00:20 4900

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 19521, (2021/01/20 05:46UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 20.82  46
Alnath         05:26:17.5 +28:36:23  1.6  4.11  60
PPM 070700     05:40:35.9 +31:21:29  5.9  0.63  63
PPM 070716     05:41:19.9 +31:11:10  7.7  0.40  64
PPM 070754     05:43:02.6 +30:54:10  9.6  0.19  64
19521          05:42:12.6 +30:49:54 16.1        64
Positions are for J2000

Event circumstances last updated at 2021/01/15 20:04:56 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)
Clarence Fulton	05:45:33	-48.7	Dark	Up	70.6	183.5	Up	05:30:33 - 06:00:33	6831
Kelowna	05:45:35	-48.9	Dark	Up	70.9	183.2	Up	05:30:35 - 06:00:35	6791
Peachland	05:45:35	-48.8	Dark	Up	71.1	182.4	Up	05:30:35 - 06:00:35	6781
Summerland	05:45:35	-48.9	Dark	Up	71.2	182.7	Up	05:30:35 - 06:00:35	6765
Penticton	05:45:35	-49.0	Dark	Up	71.3	183.0	Up	05:30:35 - 06:00:35	6757
Oliver	05:45:35	-49.2	Dark	Up	71.6	183.0	Up	05:30:35 - 06:00:35	6720
Anarchist Mountain Observatory	05:45:35	-49.4	Dark	Up	71.8	183.6	Up	05:30:35 - 06:00:35	6701
Victoria	05:45:49	-47.4	Dark	Up	72.2	172.4	Up	05:30:49 - 06:00:49	6680
Tonasket	05:45:35	-49.5	Dark	Up	72.1	183.5	Up	05:30:35 - 06:00:35	6669
Okanogan	05:45:35	-49.6	Dark	Up	72.4	183.1	Up	05:30:35 - 06:00:35	6634
Brewster	05:45:36	-49.6	Dark	Up	72.7	182.6	Up	05:30:36 - 06:00:36	6607
Manson/Chelan	05:45:37	-49.5	Dark	Up	72.9	181.5	Up	05:30:37 - 06:00:37	6587
Wenatchee	05:45:39	-49.7	Dark	Up	73.4	181.1	Up	05:30:39 - 06:00:39	6538
Ellensburg	05:45:39	-49.8	Dark	Up	73.8	180.4	Up	05:30:39 - 06:00:39	6496
Yakima	05:45:40	-49.9	Dark	Up	74.2	180.4	Up	05:30:40 - 06:00:40	6453
Toppenish/White Swan	05:45:40	-50.2	Dark	Up	74.5	181.0	Up	05:30:40 - 06:00:40	6429
Pasco	05:45:35	-51.0	Dark	Up	74.5	185.0	Up	05:30:35 - 06:00:35	6407
PNWRO	05:45:33	-51.2	Dark	Up	74.8	185.8	Up	05:30:33 - 06:00:33	6379
Goldendale	05:45:41	-50.2	Dark	Up	75.0	179.6	Up	05:30:41 - 06:00:41	6373
The Dalles	05:45:43	-50.0	Dark	Up	75.2	178.4	Up	05:30:43 - 06:00:43	6352
Maupin	05:45:42	-50.3	Dark	Up	75.7	178.7	Up	05:30:42 - 06:00:42	6306
Sisters	05:45:45	-50.4	Dark	Up	76.5	176.8	Up	05:30:45 - 06:00:45	6216
Redmond	05:45:43	-50.6	Dark	Up	76.6	178.3	Up	05:30:43 - 06:00:43	6210
Bend	05:45:44	-50.6	Dark	Up	76.8	177.7	Up	05:30:44 - 06:00:44	6188
Oregon Observatory	05:45:45	-50.6	Dark	Up	76.9	177.2	Up	05:30:45 - 06:00:45	6170
La Pine/Gilchrist	05:45:45	-50.7	Dark	Up	77.1	177.0	Up	05:30:45 - 06:00:45	6149
North Lake	05:45:43	-51.3	Dark	Up	77.6	179.2	Up	05:30:43 - 06:00:43	6097
Paisley	05:45:42	-51.7	Dark	Up	78.1	180.7	Up	05:30:42 - 06:00:42	6034
Klamath Falls	05:45:47	-51.1	Dark	Up	78.6	175.4	Up	05:30:47 - 06:00:47	5994
Lakeview	05:45:41	-52.1	Dark	Up	78.6	181.5	Up	05:30:41 - 06:00:41	5978
Cedarville	05:45:41	-52.4	Dark	Up	79.3	182.4	Up	05:30:41 - 06:00:41	5905
Fall River/Burney	05:45:46	-51.8	Dark	Up	79.8	176.7	Up	05:30:46 - 06:00:46	5863
Susanville	05:45:44	-52.5	Dark	Up	80.4	180.3	Up	05:30:44 - 06:00:44	5788
Greenville	05:45:44	-52.4	Dark	Up	80.7	178.7	Up	05:30:44 - 06:00:44	5760
Gimple	05:45:45	-52.5	Dark	Up	80.7	179.2	Up	05:30:45 - 06:00:45	5759
Quincy	05:45:44	-52.5	Dark	Up	80.9	178.7	Up	05:30:44 - 06:00:44	5738
Dunrhomin	05:44:40	-62.6	Dark	Up	74.4	237.5	Up	05:29:40 - 05:59:40	5732
Portola	05:45:43	-52.9	Dark	Up	81.0	181.3	Up	05:30:43 - 06:00:43	5720
Reno	05:45:40	-53.4	Dark	Up	81.3	185.0	Up	05:30:40 - 06:00:40	5686
Carson City	05:45:40	-53.6	Dark	Up	81.6	185.3	Up	05:30:40 - 06:00:40	5647
Yerington	05:45:38	-54.1	Dark	Up	81.7	189.2	Up	05:30:38 - 06:00:38	5621
Gardnerville	05:45:40	-53.7	Dark	Up	81.9	185.8	Up	05:30:40 - 06:00:40	5620
Hawthorne	05:45:35	-54.7	Dark	Up	82.1	192.9	Up	05:30:35 - 06:00:35	5566
Lee Vining	05:45:38	-54.5	Dark	Up	82.8	190.7	Up	05:30:38 - 06:00:38	5508
Tonopah	05:45:30	-55.9	Dark	Up	82.2	202.4	Up	05:30:30 - 06:00:30	5506
Bishop	05:45:36	-55.3	Dark	Up	83.2	196.8	Up	05:30:36 - 06:00:36	5437
Beatty	05:45:28	-56.6	Dark	Up	83.1	209.1	Up	05:30:28 - 06:00:28	5376
Indian Springs	05:45:24	-57.5	Dark	Up	82.9	217.1	Up	05:30:24 - 06:00:24	5334
Henderson	05:45:21	-58.2	Dark	Up	83.0	223.7	Up	05:30:21 - 06:00:21	5272
CPSLO	05:45:47	-54.2	Dark	Up	85.5	180.7	Up	05:30:47 - 06:00:47	5228
Patrick	05:45:16	-59.3	Dark	Up	82.7	232.8	Up	05:30:16 - 06:00:16	5198
Kingman/Dolan Springs	05:45:17	-59.2	Dark	Up	83.0	233.4	Up	05:30:17 - 06:00:17	5174
Laughlin/Bullhead City	05:45:19	-58.9	Dark	Up	83.3	231.1	Up	05:30:19 - 06:00:19	5174
Mohave Valley	05:45:19	-59.0	Dark	Up	83.5	233.0	Up	05:30:19 - 06:00:19	5144
Lake Havasu City	05:45:18	-59.3	Dark	Up	83.6	237.0	Up	05:30:18 - 06:00:18	5098
Wildwood	05:45:37	-56.1	Dark	Up	86.3	208.9	Up	05:30:37 - 06:00:37	5078
Parker	05:45:18	-59.4	Dark	Up	83.7	239.9	Up	05:30:18 - 06:00:18	5059
Idyllwild	05:45:29	-57.7	Dark	Up	85.6	230.0	Up	05:30:29 - 06:00:29	5026
George/Scottsdale	05:45:08	-61.4	Dark	Up	82.1	251.0	Up	05:30:08 - 06:00:08	5005
Blythe	05:45:20	-59.4	Dark	Up	84.2	243.0	Up	05:30:20 - 06:00:20	5002
Calipatria	05:45:24	-58.8	Dark	Up	85.1	243.5	Up	05:30:24 - 06:00:24	4952
Yuma	05:45:20	-59.6	Dark	Up	84.6	251.5	Up	05:30:20 - 06:00:20	4900