RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1320:02812739 with event index number of 1300472

Geocentric closest approach at 2024/04/03 04:32:23 UTC

J2000 position of star is 05:15:56.2 +42:47:37
Equinox of date position of star is 05:17:39.6 +42:49:08
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 39% illuminated.
Apparent brightness V=23.6

[RECON map]
Object is 37.6 AU from the Sun and 38.0 AU from the Earth.
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 319 seconds.
The 1-sigma cross-track error in the shadow position is 3973 km.
The sky-plane scale is 27525.4 km/arcsec.

The object has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 10.0 sec chord
Diameter=70.9 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2024/04/03 04:32UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:18.9 +16:33:22  0.8 27.64 131
34Bet Aur      06:01:18.5 +44:56:50  1.9  8.14 149
20Rho Aur      05:23:31.6 +41:49:34  4.9  1.47 143
PPM 047916     05:17:56.7 +42:46:53  8.0  0.06 142
181855         05:17:40.2 +42:49:08 16.6       143
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 2.8 sigma about the mid-time.
The median site spacing is 11.4 km RECON observability=1.0 and success probability=5.2%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	04:34:43	-24.0	Dark	Down	40.3	291.2	Up	04:19:43 - 04:49:43	7569
Dunrhomin	04:35:48	-33.0	Dark	Down	34.5	299.9	Up	04:20:48 - 04:50:48	7182
Nikitin	04:35:48	-33.1	Dark	Down	34.4	300.0	Up	04:20:48 - 04:50:48	7173
CU-SBO	04:35:49	-33.1	Dark	Down	34.5	300.0	Up	04:20:49 - 04:50:49	7166
Kelowna	04:34:49	-19.0	Dark	Down	47.7	285.2	Up	04:19:49 - 04:49:49	6798
Kamloops	04:34:44	-18.1	Dark	Down	48.5	283.8	Up	04:19:44 - 04:49:44	6789
Penticton	04:34:51	-19.2	Dark	Down	47.7	285.5	Up	04:19:51 - 04:49:51	6778
Peachland	04:34:50	-18.9	Dark	Down	47.8	285.2	Up	04:19:50 - 04:49:50	6777
Summerland	04:34:51	-19.1	Dark	Down	47.7	285.4	Up	04:19:51 - 04:49:51	6775
Anarchist Mountain Observatory	04:34:53	-19.6	Dark	Down	47.4	286.2	Up	04:19:53 - 04:49:53	6764
Oliver	04:34:53	-19.4	Dark	Down	47.6	285.9	Up	04:19:53 - 04:49:53	6761
Okanogan	04:34:57	-19.8	Dark	Down	47.3	286.8	Up	04:19:57 - 04:49:57	6720
Brewster	04:34:59	-19.9	Dark	Down	47.4	286.9	Up	04:19:59 - 04:49:59	6696
Manson/Chelan	04:34:59	-19.8	Dark	Down	47.6	287.0	Up	04:19:59 - 04:49:59	6666
PNWRO	04:35:11	-21.5	Dark	Down	46.1	289.5	Up	04:20:11 - 04:50:11	6643
Wenatchee	04:35:02	-19.9	Dark	Down	47.5	287.4	Up	04:20:02 - 04:50:02	6633
Ellensburg	04:35:04	-20.0	Dark	Down	47.5	287.7	Up	04:20:04 - 04:50:04	6600
Yakima	04:35:05	-20.2	Dark	Down	47.4	288.1	Up	04:20:05 - 04:50:05	6578
Toppenish/White Swan	04:35:07	-20.5	Dark	Down	47.2	288.4	Up	04:20:07 - 04:50:07	6577
Victoria	04:34:52	-17.6	AT	Down	49.8	284.5	Up	04:19:52 - 04:49:52	6521
The Dalles	04:35:11	-20.4	Dark	Down	47.5	288.8	Up	04:20:11 - 04:50:11	6491
Maupin	04:35:11	-20.7	Dark	Down	47.3	289.3	Up	04:20:11 - 04:50:11	6476
George/Scottsdale	04:36:19	-33.1	Dark	Down	35.7	301.8	Up	04:21:19 - 04:51:19	6438
Bend	04:35:19	-21.2	Dark	Down	47.0	290.4	Up	04:20:19 - 04:50:19	6403
Sisters	04:35:17	-20.9	Dark	Down	47.3	290.0	Up	04:20:17 - 04:50:17	6400
Patrick	04:36:10	-30.8	Dark	Down	38.0	300.2	Up	04:21:10 - 04:51:10	6398
Oregon Observatory	04:35:20	-21.2	Dark	Down	47.1	290.5	Up	04:20:20 - 04:50:20	6386
Laughlin/Bullhead City	04:36:11	-30.5	Dark	Down	38.4	300.1	Up	04:21:11 - 04:51:11	6337
Cedarville	04:35:34	-23.2	Dark	Down	45.3	293.3	Up	04:20:34 - 04:50:34	6333
Lake Havasu City	04:36:14	-31.0	Dark	Down	37.9	300.7	Up	04:21:14 - 04:51:14	6317
Beatty	04:36:00	-28.0	Dark	Down	40.8	298.3	Up	04:21:00 - 04:51:00	6291
Chiloquin	04:35:26	-21.6	Dark	Down	46.9	291.6	Up	04:20:26 - 04:50:26	6288
Klamath Falls	04:35:27	-21.8	Dark	Down	46.7	292.0	Up	04:20:27 - 04:50:27	6274
Hawthorne	04:35:51	-25.9	Dark	Down	42.9	296.5	Up	04:20:51 - 04:50:51	6262
Yerington	04:35:48	-25.3	Dark	Down	43.5	295.9	Up	04:20:48 - 04:50:48	6255
Reno	04:35:44	-24.5	Dark	Down	44.2	295.2	Up	04:20:44 - 04:50:44	6244
Fall River/Burney	04:35:35	-22.7	Dark	Down	45.9	293.3	Up	04:20:35 - 04:50:35	6231
Carson City	04:35:46	-24.7	Dark	Down	44.0	295.5	Up	04:20:46 - 04:50:46	6225
Portola	04:35:43	-23.9	Dark	Down	44.8	294.8	Up	04:20:43 - 04:50:43	6219
Gardnerville	04:35:47	-24.9	Dark	Down	43.9	295.8	Up	04:20:47 - 04:50:47	6214
Gimple	04:35:39	-23.5	Dark	Down	45.2	294.3	Up	04:20:39 - 04:50:39	6212
Bishop	04:35:57	-26.6	Dark	Down	42.2	297.5	Up	04:20:57 - 04:50:57	6211
Greenville	04:35:40	-23.5	Dark	Down	45.2	294.3	Up	04:20:40 - 04:50:40	6207
Lee Vining	04:35:53	-25.8	Dark	Down	43.0	296.8	Up	04:20:53 - 04:50:53	6199
Quincy	04:35:41	-23.6	Dark	Down	45.1	294.5	Up	04:20:41 - 04:50:41	6196
Yuma	04:36:23	-31.8	Dark	Down	37.1	301.8	Up	04:21:23 - 04:51:23	6193
Calipatria	04:36:19	-30.9	Dark	Down	38.0	301.3	Up	04:21:19 - 04:51:19	6157
Idyllwild	04:36:16	-29.7	Dark	Down	39.2	300.6	Up	04:21:16 - 04:51:16	6113
Wildwood	04:36:12	-28.2	Dark	Down	40.7	300.0	Up	04:21:12 - 04:51:12	6006

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 181855, (2024/04/03 04:32UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 27.64 131
34Bet Aur      05:59:31.6 +44:56:51  1.9  8.14 149
20Rho Aur      05:21:48.4 +41:48:15  4.9  1.47 143
PPM 047916     05:16:12.6 +42:45:22  8.0  0.06 142
181855         05:15:56.2 +42:47:37 16.6       142
Positions are for J2000

Event circumstances last updated at 2024/02/12 04:19:45 UT

RECON