RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1200:12057808 with event index number of 2204026

Geocentric closest approach at 2025/05/10 10:38:59 UTC

J2000 position of star is 20:13:53.9 +31:52:23
Equinox of date position of star is 20:14:51.4 +31:56:51
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon. Moon is 95% illuminated.
Apparent brightness V=21.8

[RECON map]
Object is 15.7 AU from the Sun and 15.7 AU from the Earth.
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 5.7 arcsec/hr.
The 1-sigma error in the time of the event is 78 seconds.
The 1-sigma cross-track error in the shadow position is 1058 km.
The sky-plane scale is 11364.3 km/arcsec.

The object has an absolute magnitude Hv=9.5
Diameter=82.8 km assuming a 5% albedo -- 4.3 sec chord
Diameter=33.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/05/10 10:36UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:17.8 +45:22:19  1.3 14.43 111
53Eps Cyg      20:47:14.2 +34:03:58  2.5  7.10 112
39 Cyg         20:24:52.4 +32:16:24  4.4  2.14 108
PPM 084513     20:15:16.5 +32:04:34  7.1  0.15 106
342842         20:14:54.3 +31:57:04 15.1       106
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 14.3 km RECON observability=0.7 and success probability=31.7%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	10:41:29	-5.3	CT	Down	64.9	135.5	Up	10:34:29 - 10:48:30	1060
Kamloops	10:42:02	-12.7	AT	Up	58.2	112.9	Up	10:35:02 - 10:49:03	331
Kelowna	10:41:57	-12.9	AT	Up	59.1	112.7	Up	10:34:57 - 10:48:58	288
Peachland	10:41:58	-13.1	AT	Up	58.9	112.1	Up	10:34:57 - 10:48:58	266
Summerland	10:41:57	-13.2	AT	Up	59.0	112.0	Up	10:34:57 - 10:48:58	256
Penticton	10:41:57	-13.2	AT	Up	59.1	112.0	Up	10:34:56 - 10:48:57	254
Oliver	10:41:56	-13.5	AT	Up	59.3	111.5	Up	10:34:55 - 10:48:56	221
Anarchist Mountain Observatory	10:41:55	-13.5	AT	Up	59.4	111.4	Up	10:34:54 - 10:48:55	212
Okanogan	10:41:53	-14.1	AT	Up	59.5	110.2	Up	10:34:53 - 10:48:54	143
Dunrhomin	10:40:39	-12.2	AT	Down	71.9	111.2	Up	10:33:39 - 10:47:40	138
Nikitin	10:40:39	-12.3	AT	Down	71.9	110.7	Up	10:33:38 - 10:47:39	122
CU-SBO	10:40:39	-12.4	AT	Down	71.9	110.4	Up	10:33:38 - 10:47:39	112
Brewster	10:41:53	-14.4	AT	Up	59.5	109.5	Up	10:34:52 - 10:48:53	110
Manson/Chelan	10:41:53	-14.7	AT	Up	59.3	108.7	Up	10:34:53 - 10:48:54	76
Wenatchee	10:41:52	-15.2	AT	Up	59.4	107.8	Up	10:34:52 - 10:48:53	25
Victoria	10:42:05	-15.6	AT	Up	57.1	106.3	Up	10:35:04 - 10:49:05	16
Ellensburg	10:41:52	-15.6	AT	Up	59.3	106.9	Up	10:34:51 - 10:48:52	-22
PNWRO	10:41:44	-15.6	AT	Up	60.7	107.0	Up	10:34:43 - 10:48:44	-48
Yakima	10:41:50	-15.9	AT	Up	59.4	106.2	Up	10:34:50 - 10:48:51	-61
Toppenish/White Swan	10:41:49	-16.0	AT	Up	59.6	106.0	Up	10:34:49 - 10:48:50	-75
The Dalles	10:41:49	-16.9	AT	Up	59.3	103.9	Up	10:34:48 - 10:48:49	-179
Maupin	10:41:47	-17.2	AT	Up	59.4	103.4	Up	10:34:47 - 10:48:48	-214
Sisters	10:41:46	-18.1	Dark	Up	59.3	101.4	Up	10:34:46 - 10:48:47	-316
Bend	10:41:45	-18.2	Dark	Up	59.5	101.3	Up	10:34:44 - 10:48:45	-328
Oregon Observatory	10:41:44	-18.4	Dark	Up	59.5	100.9	Up	10:34:44 - 10:48:45	-350
Chiloquin	10:41:42	-19.6	Dark	Up	59.4	98.3	Up	10:34:41 - 10:48:42	-490
Cedarville	10:41:33	-19.6	Dark	Up	60.7	97.9	Up	10:34:32 - 10:48:33	-515
Klamath Falls	10:41:40	-19.8	Dark	Up	59.5	97.8	Up	10:34:39 - 10:48:40	-518
Fall River/Burney	10:41:35	-20.5	Dark	Up	59.9	96.1	Up	10:34:34 - 10:48:35	-611
Gimple	10:41:30	-21.0	Dark	Up	60.4	94.9	Up	10:34:29 - 10:48:30	-672
Greenville	10:41:30	-21.0	Dark	Up	60.3	94.8	Up	10:34:30 - 10:48:31	-675
Reno	10:41:24	-20.9	Dark	Up	61.2	94.6	Up	10:34:24 - 10:48:25	-680
Portola	10:41:28	-21.0	Dark	Up	60.7	94.6	Up	10:34:27 - 10:48:28	-684
Quincy	10:41:30	-21.2	Dark	Up	60.3	94.5	Up	10:34:29 - 10:48:30	-694
Yerington	10:41:20	-21.0	Dark	Up	61.7	94.1	Up	10:34:20 - 10:48:21	-700
Carson City	10:41:23	-21.1	Dark	Up	61.2	94.0	Up	10:34:23 - 10:48:24	-711
Hawthorne	10:41:17	-21.0	Dark	Up	62.2	93.6	Up	10:34:16 - 10:48:17	-717
Gardnerville	10:41:22	-21.3	Dark	Up	61.3	93.5	Up	10:34:21 - 10:48:22	-731
Patrick	10:40:49	-20.5	Dark	Up	66.0	90.2	Up	10:33:48 - 10:47:49	-749
Beatty	10:41:04	-21.2	Dark	Up	63.7	91.6	Up	10:34:04 - 10:48:05	-770
George/Scottsdale	10:40:35	-20.4	Dark	Up	67.5	87.3	Up	10:33:34 - 10:47:35	-780
Lee Vining	10:41:16	-21.7	Dark	Up	61.8	92.2	Up	10:34:16 - 10:48:17	-790
Laughlin/Bullhead City	10:40:50	-21.1	Dark	Up	65.4	89.3	Up	10:33:50 - 10:47:51	-807
Bishop	10:41:12	-21.7	Dark	Up	62.4	91.5	Up	10:34:11 - 10:48:12	-809
Lake Havasu City	10:40:47	-21.4	Dark	Up	65.6	87.9	Up	10:33:47 - 10:47:48	-851
Yuma	10:40:41	-22.8	Dark	Up	65.2	83.9	Up	10:33:40 - 10:47:41	-1019
Calipatria	10:40:46	-23.1	Dark	Up	64.5	84.5	Up	10:33:45 - 10:47:46	-1031
Idyllwild	10:40:52	-23.4	Dark	Up	63.6	85.2	Up	10:33:51 - 10:47:52	-1041
Wildwood	10:41:00	-24.2	Dark	Up	62.1	85.2	Up	10:34:00 - 10:48:01	-1106

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 342842, (2025/05/10 10:36UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 14.43 111
53Eps Cyg      20:46:13.3 +33:58:20  2.5  7.10 112
39 Cyg         20:23:51.7 +32:11:24  4.4  2.14 108
PPM 084513     20:14:16.1 +31:59:52  7.1  0.15 106
342842         20:13:53.9 +31:52:23 15.1       106
Positions are for J2000

Event circumstances last updated at 2024/03/02 06:15:22 UT

RECON