RECON: TNO occultation with 523620

Event between (523620) 07RH283 and star GA1240:01258955 with event index number of 2386977

Geocentric closest approach at 2023/01/23 08:20:02 UTC

J2000 position of star is 04:39:26.2 +34:06:48
Equinox of date position of star is 04:40:56.6 +34:09:25
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 110 degrees from the moon. Moon is 4% illuminated.
Apparent brightness V=22.0

[RECON map]
Object is 21.3 AU from the Sun and 20.7 AU from the Earth.
Apparent velocity is 16.0 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 109 seconds.
The 1-sigma cross-track error in the shadow position is 1320 km.
The sky-plane scale is 15005.7 km/arcsec.

The object has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 7.2 sec chord
Diameter=46.9 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is CENTAURR

Star training set for 523620, (2023/01/23 08:20UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:14.8 +16:33:14  0.8 17.62 105
3Iot Aur       04:58:30.0 +33:12:02  2.7  3.77 113
PPM 069605     04:45:18.0 +32:54:24  6.5  1.54 110
PPM 069600     04:44:35.6 +33:58:18  8.2  0.78 110
PPM 069531     04:37:55.6 +34:15:18  9.7  0.63 109
PPM 069569     04:41:01.7 +34:10:20 10.6  0.02 109
523620         04:40:56.7 +34:09:25 16.8       110
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 33.9 km RECON observability=1.0 and success probability=36.8%

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

Sleaford 08:14:54 -55.4 Dark Down 37.8 279.1 Up 08:05:20 - 08:24:27 2393

Kamloops 08:15:32 -58.8 Dark Down 46.6 269.8 Up 08:05:59 - 08:25:06 2051

Kelowna 08:15:28 -59.6 Dark Down 46.0 271.4 Up 08:05:55 - 08:25:02 1969

Peachland 08:15:30 -59.7 Dark Down 46.2 271.3 Up 08:05:56 - 08:25:03 1954

Summerland 08:15:29 -59.9 Dark Down 46.2 271.5 Up 08:05:55 - 08:25:02 1938

Penticton 08:15:28 -59.9 Dark Down 46.1 271.6 Up 08:05:55 - 08:25:02 1932

Oliver 08:15:28 -60.3 Dark Down 46.1 272.0 Up 08:05:55 - 08:25:02 1893

Anarchist Mountain Observatory 08:15:27 -60.4 Dark Down 45.9 272.3 Up 08:05:54 - 08:25:01 1876

Okanogan 08:15:27 -61.1 Dark Down 46.1 272.8 Up 08:05:54 - 08:25:01 1803

Victoria 08:15:40 -60.9 Dark Down 48.6 269.9 Up 08:06:07 - 08:25:14 1794

Brewster 08:15:27 -61.4 Dark Down 46.2 273.0 Up 08:05:54 - 08:25:01 1771

Manson/Chelan 08:15:29 -61.6 Dark Down 46.4 272.9 Up 08:05:56 - 08:25:03 1745

Wenatchee 08:15:30 -62.1 Dark Down 46.5 273.3 Up 08:05:56 - 08:25:03 1691

Ellensburg 08:15:29 -62.5 Dark Down 46.6 273.6 Up 08:05:56 - 08:25:03 1644

Yakima 08:15:29 -62.9 Dark Down 46.6 274.0 Up 08:05:56 - 08:25:03 1599

Toppenish/White Swan 08:15:29 -63.1 Dark Down 46.5 274.3 Up 08:05:55 - 08:25:02 1576

PNWRO 08:15:23 -63.4 Dark Down 45.4 275.7 Up 08:05:50 - 08:24:57 1549

The Dalles 08:15:31 -63.9 Dark Down 47.0 274.6 Up 08:05:58 - 08:25:05 1484

Maupin 08:15:31 -64.3 Dark Down 46.9 275.2 Up 08:05:57 - 08:25:04 1439

Sisters 08:15:32 -65.2 Dark Down 47.1 275.8 Up 08:05:58 - 08:25:05 1338

Bend 08:15:30 -65.4 Dark Down 46.9 276.2 Up 08:05:57 - 08:25:04 1313

Oregon Observatory 08:15:31 -65.6 Dark Down 47.0 276.3 Up 08:05:57 - 08:25:04 1293

Dunrhomin 08:14:34 -65.3 Dark Down 34.6 288.0 Up 08:05:01 - 08:24:08 1149

Chiloquin 08:15:32 -66.9 Dark Down 47.1 277.5 Up 08:05:59 - 08:25:06 1144

Nikitin 08:14:34 -65.5 Dark Down 34.6 288.1 Up 08:05:01 - 08:24:08 1129

CU-SBO 08:14:34 -65.6 Dark Down 34.6 288.1 Up 08:05:01 - 08:24:08 1120

Klamath Falls 08:15:32 -67.2 Dark Down 47.0 277.9 Up 08:05:59 - 08:25:06 1107

Cedarville 08:15:26 -67.9 Dark Down 45.7 279.5 Up 08:05:52 - 08:24:59 1043

Fall River/Burney 08:15:30 -68.4 Dark Down 46.6 279.3 Up 08:05:56 - 08:25:03 980

Gimple 08:15:28 -69.3 Dark Down 46.0 280.5 Up 08:05:54 - 08:25:01 884

Greenville 08:15:28 -69.3 Dark Down 46.1 280.5 Up 08:05:55 - 08:25:02 883

Quincy 08:15:28 -69.5 Dark Down 46.0 280.7 Up 08:05:54 - 08:25:01 861

Portola 08:15:27 -69.7 Dark Down 45.7 281.1 Up 08:05:53 - 08:25:00 851

Reno 08:15:24 -69.9 Dark Down 45.1 281.6 Up 08:05:50 - 08:24:57 828

Carson City 08:15:24 -70.3 Dark Down 45.0 282.0 Up 08:05:50 - 08:24:57 789

Yerington 08:15:21 -70.4 Dark Down 44.5 282.5 Up 08:05:48 - 08:24:55 773

Gardnerville 08:15:24 -70.5 Dark Down 44.9 282.2 Up 08:05:50 - 08:24:57 762

Hawthorne 08:15:19 -70.8 Dark Down 44.0 283.2 Up 08:05:46 - 08:24:53 728

Lee Vining 08:15:21 -71.5 Dark Down 44.3 283.5 Up 08:05:48 - 08:24:55 661

Bishop 08:15:18 -72.0 Dark Down 43.6 284.3 Up 08:05:44 - 08:24:51 604

Beatty 08:15:12 -72.2 Dark Down 42.2 285.4 Up 08:05:39 - 08:24:46 573

Patrick 08:15:01 -72.9 Dark Down 39.6 287.8 Up 08:05:28 - 08:24:35 454

Laughlin/Bullhead City 08:15:03 -73.4 Dark Down 40.0 287.7 Up 08:05:30 - 08:24:37 416

Lake Havasu City 08:15:02 -73.9 Dark Down 39.6 288.3 Up 08:05:29 - 08:24:36 348

George/Scottsdale 08:14:54 -73.7 Dark Down 37.5 289.8 Up 08:05:20 - 08:24:27 307

Wildwood 08:15:19 -75.2 Dark Down 42.8 287.2 Up 08:05:46 - 08:24:53 245

Idyllwild 08:15:12 -75.3 Dark Down 41.3 288.1 Up 08:05:39 - 08:24:46 230

Calipatria 08:15:08 -75.5 Dark Down 40.1 289.0 Up 08:05:34 - 08:24:41 182

Yuma 08:15:04 -75.7 Dark Down 39.3 289.6 Up 08:05:31 - 08:24:38 149

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 523620, (2023/01/23 08:20UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 17.62 105
3Iot Aur       04:56:59.6 +33:09:58  2.7  3.77 113
PPM 069605     04:43:48.2 +32:51:55  6.5  1.54 110
PPM 069600     04:43:05.0 +33:55:47  8.2  0.78 110
PPM 069531     04:36:25.0 +34:12:35  9.7  0.63 109
PPM 069569     04:39:31.1 +34:07:43 10.6  0.02 109
523620         04:39:26.2 +34:06:48 16.8       109
Positions are for J2000

Event circumstances last updated at 2023/01/09 03:27:40 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)
Sleaford	08:14:54	-55.4	Dark	Down	37.8	279.1	Up	08:05:20 - 08:24:27	2393
Kamloops	08:15:32	-58.8	Dark	Down	46.6	269.8	Up	08:05:59 - 08:25:06	2051
Kelowna	08:15:28	-59.6	Dark	Down	46.0	271.4	Up	08:05:55 - 08:25:02	1969
Peachland	08:15:30	-59.7	Dark	Down	46.2	271.3	Up	08:05:56 - 08:25:03	1954
Summerland	08:15:29	-59.9	Dark	Down	46.2	271.5	Up	08:05:55 - 08:25:02	1938
Penticton	08:15:28	-59.9	Dark	Down	46.1	271.6	Up	08:05:55 - 08:25:02	1932
Oliver	08:15:28	-60.3	Dark	Down	46.1	272.0	Up	08:05:55 - 08:25:02	1893
Anarchist Mountain Observatory	08:15:27	-60.4	Dark	Down	45.9	272.3	Up	08:05:54 - 08:25:01	1876
Okanogan	08:15:27	-61.1	Dark	Down	46.1	272.8	Up	08:05:54 - 08:25:01	1803
Victoria	08:15:40	-60.9	Dark	Down	48.6	269.9	Up	08:06:07 - 08:25:14	1794
Brewster	08:15:27	-61.4	Dark	Down	46.2	273.0	Up	08:05:54 - 08:25:01	1771
Manson/Chelan	08:15:29	-61.6	Dark	Down	46.4	272.9	Up	08:05:56 - 08:25:03	1745
Wenatchee	08:15:30	-62.1	Dark	Down	46.5	273.3	Up	08:05:56 - 08:25:03	1691
Ellensburg	08:15:29	-62.5	Dark	Down	46.6	273.6	Up	08:05:56 - 08:25:03	1644
Yakima	08:15:29	-62.9	Dark	Down	46.6	274.0	Up	08:05:56 - 08:25:03	1599
Toppenish/White Swan	08:15:29	-63.1	Dark	Down	46.5	274.3	Up	08:05:55 - 08:25:02	1576
PNWRO	08:15:23	-63.4	Dark	Down	45.4	275.7	Up	08:05:50 - 08:24:57	1549
The Dalles	08:15:31	-63.9	Dark	Down	47.0	274.6	Up	08:05:58 - 08:25:05	1484
Maupin	08:15:31	-64.3	Dark	Down	46.9	275.2	Up	08:05:57 - 08:25:04	1439
Sisters	08:15:32	-65.2	Dark	Down	47.1	275.8	Up	08:05:58 - 08:25:05	1338
Bend	08:15:30	-65.4	Dark	Down	46.9	276.2	Up	08:05:57 - 08:25:04	1313
Oregon Observatory	08:15:31	-65.6	Dark	Down	47.0	276.3	Up	08:05:57 - 08:25:04	1293
Dunrhomin	08:14:34	-65.3	Dark	Down	34.6	288.0	Up	08:05:01 - 08:24:08	1149
Chiloquin	08:15:32	-66.9	Dark	Down	47.1	277.5	Up	08:05:59 - 08:25:06	1144
Nikitin	08:14:34	-65.5	Dark	Down	34.6	288.1	Up	08:05:01 - 08:24:08	1129
CU-SBO	08:14:34	-65.6	Dark	Down	34.6	288.1	Up	08:05:01 - 08:24:08	1120
Klamath Falls	08:15:32	-67.2	Dark	Down	47.0	277.9	Up	08:05:59 - 08:25:06	1107
Cedarville	08:15:26	-67.9	Dark	Down	45.7	279.5	Up	08:05:52 - 08:24:59	1043
Fall River/Burney	08:15:30	-68.4	Dark	Down	46.6	279.3	Up	08:05:56 - 08:25:03	980
Gimple	08:15:28	-69.3	Dark	Down	46.0	280.5	Up	08:05:54 - 08:25:01	884
Greenville	08:15:28	-69.3	Dark	Down	46.1	280.5	Up	08:05:55 - 08:25:02	883
Quincy	08:15:28	-69.5	Dark	Down	46.0	280.7	Up	08:05:54 - 08:25:01	861
Portola	08:15:27	-69.7	Dark	Down	45.7	281.1	Up	08:05:53 - 08:25:00	851
Reno	08:15:24	-69.9	Dark	Down	45.1	281.6	Up	08:05:50 - 08:24:57	828
Carson City	08:15:24	-70.3	Dark	Down	45.0	282.0	Up	08:05:50 - 08:24:57	789
Yerington	08:15:21	-70.4	Dark	Down	44.5	282.5	Up	08:05:48 - 08:24:55	773
Gardnerville	08:15:24	-70.5	Dark	Down	44.9	282.2	Up	08:05:50 - 08:24:57	762
Hawthorne	08:15:19	-70.8	Dark	Down	44.0	283.2	Up	08:05:46 - 08:24:53	728
Lee Vining	08:15:21	-71.5	Dark	Down	44.3	283.5	Up	08:05:48 - 08:24:55	661
Bishop	08:15:18	-72.0	Dark	Down	43.6	284.3	Up	08:05:44 - 08:24:51	604
Beatty	08:15:12	-72.2	Dark	Down	42.2	285.4	Up	08:05:39 - 08:24:46	573
Patrick	08:15:01	-72.9	Dark	Down	39.6	287.8	Up	08:05:28 - 08:24:35	454
Laughlin/Bullhead City	08:15:03	-73.4	Dark	Down	40.0	287.7	Up	08:05:30 - 08:24:37	416
Lake Havasu City	08:15:02	-73.9	Dark	Down	39.6	288.3	Up	08:05:29 - 08:24:36	348
George/Scottsdale	08:14:54	-73.7	Dark	Down	37.5	289.8	Up	08:05:20 - 08:24:27	307
Wildwood	08:15:19	-75.2	Dark	Down	42.8	287.2	Up	08:05:46 - 08:24:53	245
Idyllwild	08:15:12	-75.3	Dark	Down	41.3	288.1	Up	08:05:39 - 08:24:46	230
Calipatria	08:15:08	-75.5	Dark	Down	40.1	289.0	Up	08:05:34 - 08:24:41	182
Yuma	08:15:04	-75.7	Dark	Down	39.3	289.6	Up	08:05:31 - 08:24:38	149