RECON: TNO occultation with 137295

Event between (137295) 99RB216 and star GA0980:00317839 with event index number of 2461669

Geocentric closest approach at 2028/10/21 08:59:31 UTC

J2000 position of star is 03:38:33.5 +08:05:27
Equinox of date position of star is 03:39:45.0 +08:09:43
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 157 degrees from the moon. Moon is 14% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 34.7 AU from the Sun and 33.8 AU from the Earth.
The TNO is moving 21.7 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 221 seconds.
The 1-sigma cross-track error in the shadow position is 2197 km.
The sky-plane scale is 24514.4 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=205.1 km assuming a 5% albedo -- 9.5 sec chord
Diameter=83.7 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is 2:1E

Star training set for 137295, (2028/10/21 09:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:34.6 +16:33:54  0.8 16.33 171
Menkar         03:03:47.3 +04:12:04  2.5  9.86 148
6 Tau          03:34:09.6 +09:28:07  5.6  1.95 157
PPM 146796     03:41:48.4 +07:40:35  7.7  0.66 157
PPM 146795     03:41:48.3 +08:10:24  9.8  0.42 157
PPM 146744     03:39:21.6 +08:05:03 11.4  0.21 157
137295         03:40:06.5 +08:11:00 16.7       157
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 4.1 sigma about the mid-time.
The median site spacing is 24.5 km RECON observability=1.0 and success probability=15.1%

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

Kamloops 08:58:50 -47.6 Dark Down 46.6 165.6 Up 08:43:50 - 09:13:50 3399

Victoria 08:59:04 -50.3 Dark Down 48.1 160.6 Up 08:44:04 - 09:14:04 3331

Peachland 08:58:50 -48.2 Dark Down 47.6 166.2 Up 08:43:50 - 09:13:50 3317

Kelowna 08:58:49 -48.0 Dark Down 47.5 166.6 Up 08:43:49 - 09:13:49 3317

Summerland 08:58:50 -48.3 Dark Down 47.8 166.3 Up 08:43:50 - 09:13:50 3304

Penticton 08:58:50 -48.3 Dark Down 47.9 166.4 Up 08:43:50 - 09:13:50 3296

Oliver 08:58:51 -48.6 Dark Down 48.2 166.3 Up 08:43:51 - 09:13:51 3270

Anarchist Mountain Observatory 08:58:51 -48.7 Dark Down 48.4 166.6 Up 08:43:51 - 09:13:51 3253

Tonasket 08:58:51 -49.0 Dark Down 48.7 166.4 Up 08:43:51 - 09:13:51 3232

Okanogan 08:58:52 -49.3 Dark Down 49.0 166.1 Up 08:43:52 - 09:13:52 3211

Brewster 08:58:53 -49.6 Dark Down 49.2 165.7 Up 08:43:53 - 09:13:53 3197

Manson/Chelan 08:58:55 -49.9 Dark Down 49.4 165.1 Up 08:43:55 - 09:13:55 3192

Wenatchee 08:58:57 -50.4 Dark Down 49.8 164.7 Up 08:43:57 - 09:13:57 3161

Ellensburg 08:58:58 -50.8 Dark Down 50.1 164.3 Up 08:43:58 - 09:13:58 3137

Sleaford 08:58:05 -41.2 Dark Down 45.9 186.1 Up 08:43:05 - 09:13:05 3131

Yakima 08:58:59 -51.2 Dark Down 50.5 164.1 Up 08:43:59 - 09:13:59 3106

Toppenish/White Swan 08:58:59 -51.3 Dark Down 50.8 164.3 Up 08:43:59 - 09:13:59 3085

Goldendale 08:59:01 -52.0 Dark Down 51.2 163.5 Up 08:44:01 - 09:14:01 3056

The Dalles 08:59:03 -52.3 Dark Down 51.4 162.8 Up 08:44:03 - 09:14:03 3049

Maupin 08:59:04 -52.6 Dark Down 51.8 162.8 Up 08:44:04 - 09:14:04 3014

PNWRO 08:58:55 -51.1 Dark Down 51.4 166.5 Up 08:43:55 - 09:13:55 3013

Sisters 08:59:07 -53.5 Dark Down 52.5 161.7 Up 08:44:07 - 09:14:07 2961

Bend 08:59:07 -53.7 Dark Down 52.8 162.1 Up 08:44:07 - 09:14:07 2934

Oregon Observatory 08:59:08 -53.9 Dark Down 52.9 161.8 Up 08:44:08 - 09:14:08 2925

North Lake 08:59:07 -54.2 Dark Down 53.7 162.4 Up 08:44:07 - 09:14:07 2858

Chiloquin 08:59:12 -55.1 Dark Down 54.1 160.6 Up 08:44:12 - 09:14:12 2834

Klamath Falls 08:59:12 -55.4 Dark Down 54.4 160.5 Up 08:44:12 - 09:14:12 2804

Lakeview 08:59:07 -54.9 Dark Down 54.8 162.9 Up 08:44:07 - 09:14:07 2756

Cedarville 08:59:08 -55.4 Dark Down 55.5 162.9 Up 08:44:08 - 09:14:08 2697

Fall River/Burney 08:59:14 -56.3 Dark Down 55.7 160.6 Up 08:44:14 - 09:14:14 2696

Susanville 08:59:12 -56.5 Dark Down 56.4 161.6 Up 08:44:12 - 09:14:12 2621

Greenville 08:59:14 -56.9 Dark Down 56.6 161.0 Up 08:44:14 - 09:14:14 2607

Gimple 08:59:14 -56.8 Dark Down 56.6 161.1 Up 08:44:14 - 09:14:14 2605

Quincy 08:59:14 -57.0 Dark Down 56.8 160.9 Up 08:44:14 - 09:14:14 2590

Portola 08:59:13 -56.9 Dark Down 57.0 161.6 Up 08:44:13 - 09:14:13 2565

Reno 08:59:11 -56.9 Dark Down 57.5 162.6 Up 08:44:11 - 09:14:11 2521

Carson City 08:59:12 -57.1 Dark Down 57.8 162.5 Up 08:44:12 - 09:14:12 2490

Gardnerville 08:59:12 -57.3 Dark Down 58.0 162.5 Up 08:44:12 - 09:14:12 2468

Yerington 08:59:10 -57.0 Dark Down 58.1 163.6 Up 08:44:10 - 09:14:10 2453

Hawthorne 08:59:09 -57.1 Dark Down 58.7 164.3 Up 08:44:09 - 09:14:09 2396

Lee Vining 08:59:12 -57.8 Dark Down 59.1 163.2 Up 08:44:12 - 09:14:12 2364

Tonopah 08:59:05 -56.8 Dark Down 59.4 166.8 Up 08:44:05 - 09:14:05 2309

Bishop 08:59:11 -57.9 Dark Down 59.9 164.3 Up 08:44:11 - 09:14:11 2288

Beatty 08:59:05 -57.4 Dark Down 60.6 167.2 Up 08:44:05 - 09:14:05 2193

Indian Springs 08:59:02 -57.1 Dark Down 61.1 169.2 Up 08:44:02 - 09:14:02 2127

Dunrhomin 08:58:17 -48.5 Dark Down 57.5 189.4 Up 08:43:17 - 09:13:17 2122

CU-SBO 08:58:18 -48.7 Dark Down 57.8 189.3 Up 08:43:18 - 09:13:18 2102

Henderson 08:59:00 -57.0 Dark Down 61.7 170.5 Up 08:44:00 - 09:14:00 2056

Wildwood 08:59:18 -60.5 Dark Down 63.0 162.2 Up 08:44:18 - 09:14:18 2006

Laughlin/Bullhead City 08:59:00 -57.4 Dark Down 62.7 171.1 Up 08:44:00 - 09:14:00 1964

Patrick 08:58:57 -56.8 Dark Down 62.5 172.6 Up 08:43:57 - 09:13:57 1962

Kingman/Dolan Springs 08:58:58 -57.1 Dark Down 62.7 172.2 Up 08:43:58 - 09:13:58 1949

Mohave Valley 08:59:01 -57.6 Dark Down 62.9 171.0 Up 08:44:01 - 09:14:01 1939

Idyllwild 08:59:11 -59.6 Dark Down 63.7 166.0 Up 08:44:11 - 09:14:11 1909

Lake Havasu City 08:59:01 -57.7 Dark Down 63.4 171.4 Up 08:44:01 - 09:14:01 1894

Parker 08:59:01 -57.9 Dark Down 63.7 171.4 Up 08:44:01 - 09:14:01 1861

Calipatria 08:59:08 -59.3 Dark Down 64.5 168.3 Up 08:44:08 - 09:14:08 1811

Yuma 08:59:05 -59.0 Dark Down 65.1 170.2 Up 08:44:05 - 09:14:05 1740

George/Scottsdale 08:58:53 -56.6 Dark Down 64.3 176.7 Up 08:43:53 - 09:13:53 1739

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 137295, (2028/10/21 09:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 16.33 171
Menkar         03:02:16.8 +04:05:21  2.5  9.86 148
6 Tau          03:32:35.9 +09:22:23  5.6  1.95 157
PPM 146796     03:40:15.6 +07:35:06  7.7  0.66 157
PPM 146795     03:40:15.2 +08:04:55  9.8  0.42 157
PPM 146744     03:37:48.5 +07:59:29 11.4  0.21 157
137295         03:38:33.5 +08:05:27 16.7       157
Positions are for J2000

Event circumstances last updated at 2022/02/20 00:51:31 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)
Kamloops	08:58:50	-47.6	Dark	Down	46.6	165.6	Up	08:43:50 - 09:13:50	3399
Victoria	08:59:04	-50.3	Dark	Down	48.1	160.6	Up	08:44:04 - 09:14:04	3331
Peachland	08:58:50	-48.2	Dark	Down	47.6	166.2	Up	08:43:50 - 09:13:50	3317
Kelowna	08:58:49	-48.0	Dark	Down	47.5	166.6	Up	08:43:49 - 09:13:49	3317
Summerland	08:58:50	-48.3	Dark	Down	47.8	166.3	Up	08:43:50 - 09:13:50	3304
Penticton	08:58:50	-48.3	Dark	Down	47.9	166.4	Up	08:43:50 - 09:13:50	3296
Oliver	08:58:51	-48.6	Dark	Down	48.2	166.3	Up	08:43:51 - 09:13:51	3270
Anarchist Mountain Observatory	08:58:51	-48.7	Dark	Down	48.4	166.6	Up	08:43:51 - 09:13:51	3253
Tonasket	08:58:51	-49.0	Dark	Down	48.7	166.4	Up	08:43:51 - 09:13:51	3232
Okanogan	08:58:52	-49.3	Dark	Down	49.0	166.1	Up	08:43:52 - 09:13:52	3211
Brewster	08:58:53	-49.6	Dark	Down	49.2	165.7	Up	08:43:53 - 09:13:53	3197
Manson/Chelan	08:58:55	-49.9	Dark	Down	49.4	165.1	Up	08:43:55 - 09:13:55	3192
Wenatchee	08:58:57	-50.4	Dark	Down	49.8	164.7	Up	08:43:57 - 09:13:57	3161
Ellensburg	08:58:58	-50.8	Dark	Down	50.1	164.3	Up	08:43:58 - 09:13:58	3137
Sleaford	08:58:05	-41.2	Dark	Down	45.9	186.1	Up	08:43:05 - 09:13:05	3131
Yakima	08:58:59	-51.2	Dark	Down	50.5	164.1	Up	08:43:59 - 09:13:59	3106
Toppenish/White Swan	08:58:59	-51.3	Dark	Down	50.8	164.3	Up	08:43:59 - 09:13:59	3085
Goldendale	08:59:01	-52.0	Dark	Down	51.2	163.5	Up	08:44:01 - 09:14:01	3056
The Dalles	08:59:03	-52.3	Dark	Down	51.4	162.8	Up	08:44:03 - 09:14:03	3049
Maupin	08:59:04	-52.6	Dark	Down	51.8	162.8	Up	08:44:04 - 09:14:04	3014
PNWRO	08:58:55	-51.1	Dark	Down	51.4	166.5	Up	08:43:55 - 09:13:55	3013
Sisters	08:59:07	-53.5	Dark	Down	52.5	161.7	Up	08:44:07 - 09:14:07	2961
Bend	08:59:07	-53.7	Dark	Down	52.8	162.1	Up	08:44:07 - 09:14:07	2934
Oregon Observatory	08:59:08	-53.9	Dark	Down	52.9	161.8	Up	08:44:08 - 09:14:08	2925
North Lake	08:59:07	-54.2	Dark	Down	53.7	162.4	Up	08:44:07 - 09:14:07	2858
Chiloquin	08:59:12	-55.1	Dark	Down	54.1	160.6	Up	08:44:12 - 09:14:12	2834
Klamath Falls	08:59:12	-55.4	Dark	Down	54.4	160.5	Up	08:44:12 - 09:14:12	2804
Lakeview	08:59:07	-54.9	Dark	Down	54.8	162.9	Up	08:44:07 - 09:14:07	2756
Cedarville	08:59:08	-55.4	Dark	Down	55.5	162.9	Up	08:44:08 - 09:14:08	2697
Fall River/Burney	08:59:14	-56.3	Dark	Down	55.7	160.6	Up	08:44:14 - 09:14:14	2696
Susanville	08:59:12	-56.5	Dark	Down	56.4	161.6	Up	08:44:12 - 09:14:12	2621
Greenville	08:59:14	-56.9	Dark	Down	56.6	161.0	Up	08:44:14 - 09:14:14	2607
Gimple	08:59:14	-56.8	Dark	Down	56.6	161.1	Up	08:44:14 - 09:14:14	2605
Quincy	08:59:14	-57.0	Dark	Down	56.8	160.9	Up	08:44:14 - 09:14:14	2590
Portola	08:59:13	-56.9	Dark	Down	57.0	161.6	Up	08:44:13 - 09:14:13	2565
Reno	08:59:11	-56.9	Dark	Down	57.5	162.6	Up	08:44:11 - 09:14:11	2521
Carson City	08:59:12	-57.1	Dark	Down	57.8	162.5	Up	08:44:12 - 09:14:12	2490
Gardnerville	08:59:12	-57.3	Dark	Down	58.0	162.5	Up	08:44:12 - 09:14:12	2468
Yerington	08:59:10	-57.0	Dark	Down	58.1	163.6	Up	08:44:10 - 09:14:10	2453
Hawthorne	08:59:09	-57.1	Dark	Down	58.7	164.3	Up	08:44:09 - 09:14:09	2396
Lee Vining	08:59:12	-57.8	Dark	Down	59.1	163.2	Up	08:44:12 - 09:14:12	2364
Tonopah	08:59:05	-56.8	Dark	Down	59.4	166.8	Up	08:44:05 - 09:14:05	2309
Bishop	08:59:11	-57.9	Dark	Down	59.9	164.3	Up	08:44:11 - 09:14:11	2288
Beatty	08:59:05	-57.4	Dark	Down	60.6	167.2	Up	08:44:05 - 09:14:05	2193
Indian Springs	08:59:02	-57.1	Dark	Down	61.1	169.2	Up	08:44:02 - 09:14:02	2127
Dunrhomin	08:58:17	-48.5	Dark	Down	57.5	189.4	Up	08:43:17 - 09:13:17	2122
CU-SBO	08:58:18	-48.7	Dark	Down	57.8	189.3	Up	08:43:18 - 09:13:18	2102
Henderson	08:59:00	-57.0	Dark	Down	61.7	170.5	Up	08:44:00 - 09:14:00	2056
Wildwood	08:59:18	-60.5	Dark	Down	63.0	162.2	Up	08:44:18 - 09:14:18	2006
Laughlin/Bullhead City	08:59:00	-57.4	Dark	Down	62.7	171.1	Up	08:44:00 - 09:14:00	1964
Patrick	08:58:57	-56.8	Dark	Down	62.5	172.6	Up	08:43:57 - 09:13:57	1962
Kingman/Dolan Springs	08:58:58	-57.1	Dark	Down	62.7	172.2	Up	08:43:58 - 09:13:58	1949
Mohave Valley	08:59:01	-57.6	Dark	Down	62.9	171.0	Up	08:44:01 - 09:14:01	1939
Idyllwild	08:59:11	-59.6	Dark	Down	63.7	166.0	Up	08:44:11 - 09:14:11	1909
Lake Havasu City	08:59:01	-57.7	Dark	Down	63.4	171.4	Up	08:44:01 - 09:14:01	1894
Parker	08:59:01	-57.9	Dark	Down	63.7	171.4	Up	08:44:01 - 09:14:01	1861
Calipatria	08:59:08	-59.3	Dark	Down	64.5	168.3	Up	08:44:08 - 09:14:08	1811
Yuma	08:59:05	-59.0	Dark	Down	65.1	170.2	Up	08:44:05 - 09:14:05	1740
George/Scottsdale	08:58:53	-56.6	Dark	Down	64.3	176.7	Up	08:43:53 - 09:13:53	1739