RECON: TNO occultation with 98WY31

Event between 98WY31 and star GA1120:02635794 with event index number of 1326870

Geocentric closest approach at 2023/12/28 04:27:05 UTC

J2000 position of star is 07:05:18.1 +23:55:40
Equinox of date position of star is 07:06:42.6 +23:53:28
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 6 degrees from the moon. Moon is 98% illuminated.
Apparent brightness V=23.2

[RECON map]
Object is 42.6 AU from the Sun and 41.6 AU from the Earth.
Apparent velocity is 25.2 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 144 seconds.
The 1-sigma cross-track error in the shadow position is 1685 km.
The sky-plane scale is 30172.4 km/arcsec.

The object has an absolute magnitude Hv=6.9
Diameter=253.5 km assuming a 5% albedo -- 10.1 sec chord
Diameter=103.5 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY31, (2023/12/28 04:30UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:46.9 +27:57:59  1.1  9.87   4
42Ome Gem      07:03:52.4 +24:10:45  5.2  0.72   6
PPM 097045     07:08:44.4 +24:07:46  8.4  0.51   6
PPM 097030     07:07:49.5 +24:05:54  9.9  0.32   6
98WY31         07:06:45.5 +23:53:24 16.9         6
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 26.8 km RECON observability=1.0 and success probability=24.8%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	04:29:45	-40.9	Dark	Up	35.3	94.6	Up	04:17:14 - 04:42:17	-673
Kelowna	04:29:46	-41.6	Dark	Up	36.0	94.8	Up	04:17:15 - 04:42:18	-766
Peachland	04:29:47	-41.5	Dark	Up	35.8	94.4	Up	04:17:15 - 04:42:18	-769
Summerland	04:29:47	-41.6	Dark	Up	35.8	94.4	Up	04:17:16 - 04:42:19	-785
Penticton	04:29:47	-41.6	Dark	Up	35.9	94.4	Up	04:17:16 - 04:42:19	-793
Victoria	04:29:55	-39.4	Dark	Up	33.5	90.8	Up	04:17:24 - 04:42:27	-798
Sleaford	04:29:19	-48.7	Dark	Up	43.8	108.4	Up	04:16:47 - 04:41:50	-808
Oliver	04:29:48	-41.7	Dark	Up	35.9	94.2	Up	04:17:16 - 04:42:19	-825
Anarchist Mountain Observatory	04:29:48	-41.9	Dark	Up	36.1	94.2	Up	04:17:17 - 04:42:20	-845
Okanogan	04:29:50	-41.9	Dark	Up	36.0	93.6	Up	04:17:19 - 04:42:22	-899
Brewster	04:29:51	-41.8	Dark	Up	35.9	93.2	Up	04:17:20 - 04:42:23	-920
Manson/Chelan	04:29:52	-41.6	Dark	Up	35.6	92.8	Up	04:17:21 - 04:42:24	-931
Wenatchee	04:29:54	-41.6	Dark	Up	35.6	92.3	Up	04:17:22 - 04:42:25	-971
Ellensburg	04:29:55	-41.5	Dark	Up	35.4	91.9	Up	04:17:23 - 04:42:26	-1004
Yakima	04:29:56	-41.6	Dark	Up	35.4	91.6	Up	04:17:24 - 04:42:27	-1041
Toppenish/White Swan	04:29:56	-41.7	Dark	Up	35.6	91.6	Up	04:17:25 - 04:42:28	-1065
The Dalles	04:29:59	-41.3	Dark	Up	35.0	90.4	Up	04:17:28 - 04:42:31	-1120
PNWRO	04:29:55	-42.8	Dark	Up	36.6	92.4	Up	04:17:23 - 04:42:26	-1134
Maupin	04:30:00	-41.5	Dark	Up	35.1	90.2	Up	04:17:29 - 04:42:32	-1161
Sisters	04:30:03	-41.2	Dark	Up	34.8	89.3	Up	04:17:32 - 04:42:35	-1232
Bend	04:30:03	-41.4	Dark	Up	34.9	89.3	Up	04:17:31 - 04:42:34	-1261
Oregon Observatory	04:30:03	-41.4	Dark	Up	34.8	89.1	Up	04:17:32 - 04:42:35	-1274
Chiloquin	04:30:07	-41.2	Dark	Up	34.5	87.9	Up	04:17:36 - 04:42:39	-1389
Klamath Falls	04:30:08	-41.3	Dark	Up	34.6	87.7	Up	04:17:36 - 04:42:39	-1424
Cedarville	04:30:06	-42.6	Dark	Up	35.7	88.3	Up	04:17:35 - 04:42:38	-1532
Fall River/Burney	04:30:09	-41.7	Dark	Up	34.8	87.2	Up	04:17:38 - 04:42:41	-1548
Greenville	04:30:11	-42.1	Dark	Up	35.1	86.8	Up	04:17:39 - 04:42:42	-1648
Gimple	04:30:11	-42.2	Dark	Up	35.2	86.9	Up	04:17:39 - 04:42:42	-1650
Quincy	04:30:12	-42.1	Dark	Up	35.1	86.7	Up	04:17:40 - 04:42:43	-1668
Portola	04:30:11	-42.5	Dark	Up	35.5	86.9	Up	04:17:40 - 04:42:43	-1692
Reno	04:30:10	-43.0	Dark	Up	35.9	87.1	Up	04:17:39 - 04:42:42	-1735
Carson City	04:30:10	-43.1	Dark	Up	35.9	86.8	Up	04:17:39 - 04:42:42	-1772
Gardnerville	04:30:11	-43.1	Dark	Up	36.0	86.7	Up	04:17:40 - 04:42:43	-1797
Yerington	04:30:10	-43.6	Dark	Up	36.4	87.1	Up	04:17:39 - 04:42:42	-1807
Hawthorne	04:30:10	-44.0	Dark	Up	36.8	87.0	Up	04:17:39 - 04:42:42	-1867
Lee Vining	04:30:12	-43.7	Dark	Up	36.4	86.3	Up	04:17:41 - 04:42:44	-1911
Dunrhomin	04:29:40	-53.9	Dark	Up	47.0	97.4	Up	04:17:08 - 04:42:11	-1987
Bishop	04:30:12	-44.3	Dark	Up	36.9	86.3	Up	04:17:40 - 04:42:43	-1989
Nikitin	04:29:40	-53.9	Dark	Up	47.0	97.2	Up	04:17:08 - 04:42:11	-2005
CU-SBO	04:29:40	-53.8	Dark	Up	47.0	97.1	Up	04:17:08 - 04:42:11	-2010
Beatty	04:30:10	-45.6	Dark	Up	38.2	86.9	Up	04:17:38 - 04:42:41	-2078
Patrick	04:30:06	-48.0	Dark	Up	40.4	87.3	Up	04:17:35 - 04:42:38	-2301
Laughlin/Bullhead City	04:30:08	-47.4	Dark	Up	39.9	86.7	Up	04:17:37 - 04:42:40	-2309
Wildwood	04:30:18	-44.2	Dark	Up	36.5	83.8	Up	04:17:47 - 04:42:50	-2316
Lake Havasu City	04:30:09	-47.7	Dark	Up	40.0	86.2	Up	04:17:37 - 04:42:40	-2385
Idyllwild	04:30:15	-45.7	Dark	Up	38.0	84.4	Up	04:17:43 - 04:42:46	-2403
Calipatria	04:30:13	-46.7	Dark	Up	38.9	84.5	Up	04:17:42 - 04:42:45	-2497
George/Scottsdale	04:30:05	-49.7	Dark	Up	42.0	86.8	Up	04:17:34 - 04:42:37	-2525
Yuma	04:30:12	-47.5	Dark	Up	39.6	84.6	Up	04:17:41 - 04:42:44	-2564

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 98WY31, (2023/12/28 04:30UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  9.87   4
42Ome Gem      07:02:24.8 +24:12:55  5.2  0.72   6
PPM 097045     07:07:16.9 +24:10:06  8.4  0.51   6
PPM 097030     07:06:22.0 +24:08:13  9.9  0.32   6
98WY31         07:05:18.1 +23:55:40 16.9         6
Positions are for J2000

Event circumstances last updated at 2023/03/04 03:47:16 UT

RECON