RECON: TNO occultation with 04KV18

Event between 04KV18 and star GA0760:14837920 with event index number of 1451155

Geocentric closest approach at 2025/07/24 06:25:34 UTC

J2000 position of star is 18:33:19.6 -13:29:21
Equinox of date position of star is 18:34:25.5 -13:28:24
Stellar brightness G=15.5, use SENSEUP=128
Star is 159 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=24.0

[RECON map]
TNO is 31.0 AU from the Sun and 30.1 AU from the Earth.
The TNO is moving 21.8 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 879 seconds.
The 1-sigma cross-track error in the shadow position is 4743 km.
The sky-plane scale is 21845.4 km/arcsec.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.5 km assuming a 5% albedo -- 4.4 sec chord
Diameter=39.0 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 04KV18, (2025/07/24 06:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.7 -26:29:11  0.9 31.75 135
Nunki          18:56:50.9 -26:15:45  2.0 13.80 168
PPM 234707     18:35:06.6 -14:49:57  6.1  1.37 159
PPM 234736     18:36:13.8 -13:24:46  8.4  0.36 159
PPM 234696     18:34:41.9 -13:28:21  8.6  0.02 158
04KV18         18:34:46.2 -13:28:05 15.5       159
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 1.0 sigma about the mid-time.
The median site spacing is 13.3 km RECON observability=1.0 and success probability=6.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:25:05 -16.9 AT Down 26.6 180.9 Low 06:10:05 - 06:40:05 3867
Summerland 06:25:06 -17.1 AT Down 26.9 180.6 Low 06:10:06 - 06:40:06 3854
Penticton 06:25:05 -17.2 AT Down 27.0 180.7 Low 06:10:05 - 06:40:05 3850
Okanagan Falls 06:25:05 -17.4 AT Down 27.2 180.7 Low 06:10:05 - 06:40:05 3841
Oliver 06:25:05 -17.5 AT Down 27.3 180.7 Low 06:10:05 - 06:40:05 3832
Anarchist Mountain Observatory 06:25:05 -17.8 AT Down 27.5 180.9 Low 06:10:05 - 06:40:05 3822
Oroville 06:25:05 -17.8 AT Down 27.6 180.8 Low 06:10:05 - 06:40:05 3819
Tonasket 06:25:06 -18.0 Dark Down 27.8 180.8 Low 06:10:06 - 06:40:06 3807
Okanogan 06:25:06 -18.3 Dark Down 28.1 180.7 Low 06:10:06 - 06:40:06 3791
Brewster 06:25:06 -18.5 Dark Down 28.4 180.4 Low 06:10:06 - 06:40:06 3778
Manson/Chelan 06:25:08 -18.6 Dark Down 28.6 180.0 Low 06:10:08 - 06:40:08 3770
Entiat 06:25:08 -18.7 Dark Down 28.8 180.0 Low 06:10:08 - 06:40:08 3759
Wenatchee 06:25:08 -18.9 Dark Down 29.1 179.8 Low 06:10:08 - 06:40:08 3746
Ellensburg 06:25:10 -19.2 Dark Down 29.5 179.6 Low 06:10:10 - 06:40:10 3725
Yakima 06:25:10 -19.6 Dark Down 29.9 179.6 Low 06:10:10 - 06:40:10 3703
Toppenish/White Swan 06:25:09 -19.9 Dark Down 30.1 179.8 Up 06:10:09 - 06:40:09 3690
Pasco 06:25:05 -20.3 Dark Down 30.3 181.2 Up 06:10:05 - 06:40:05 3673
Goldendale 06:25:11 -20.2 Dark Down 30.7 179.3 Up 06:10:11 - 06:40:11 3663
PNWRO 06:25:04 -20.6 Dark Down 30.5 181.4 Up 06:10:04 - 06:40:04 3657
George/Umatilla 06:25:06 -20.6 Dark Down 30.6 180.9 Up 06:10:06 - 06:40:06 3656
The Dalles 06:25:12 -20.3 Dark Down 30.9 178.9 Up 06:10:12 - 06:40:12 3653
Maupin 06:25:12 -20.7 Dark Down 31.3 179.0 Up 06:10:12 - 06:40:12 3628
Madras/Culver 06:25:13 -21.2 Dark Down 31.9 178.9 Up 06:10:13 - 06:40:13 3597
Sisters 06:25:14 -21.3 Dark Down 32.2 178.4 Up 06:10:14 - 06:40:14 3581
Redmond 06:25:12 -21.5 Dark Down 32.2 178.9 Up 06:10:12 - 06:40:12 3576
Bend 06:25:13 -21.6 Dark Down 32.4 178.7 Up 06:10:13 - 06:40:13 3565
Oregon Observatory 06:25:14 -21.8 Dark Down 32.6 178.6 Up 06:10:14 - 06:40:14 3556
La Pine/Gilchrist 06:25:15 -21.9 Dark Down 32.8 178.5 Up 06:10:15 - 06:40:15 3544
North Lake 06:25:12 -22.5 Dark Down 33.3 179.2 Up 06:10:12 - 06:40:12 3513
Chiloquin 06:25:16 -22.8 Dark Down 33.9 178.1 Up 06:10:16 - 06:40:16 3479
Paisley 06:25:11 -23.1 Dark Down 33.8 179.6 Up 06:10:11 - 06:40:11 3476
Klamath Falls 06:25:15 -23.1 Dark Down 34.3 178.2 Up 06:10:15 - 06:40:15 3458
Lakeview 06:25:10 -23.6 Dark Down 34.3 179.8 Up 06:10:10 - 06:40:10 3443
Tulelake 06:25:15 -23.5 Dark Down 34.5 178.5 Up 06:10:15 - 06:40:15 3438
Cedarville 06:25:10 -24.3 Dark Down 35.0 180.0 Up 06:10:10 - 06:40:10 3400
Fall River/Burney 06:25:15 -24.3 Dark Down 35.5 178.6 Up 06:10:15 - 06:40:15 3380
Susanville 06:25:12 -25.1 Dark Down 36.1 179.5 Up 06:10:12 - 06:40:12 3333
Greenville 06:25:13 -25.3 Dark Down 36.4 179.1 Up 06:10:13 - 06:40:13 3318
Gimple 06:25:13 -25.3 Dark Down 36.4 179.2 Up 06:10:13 - 06:40:13 3317
Quincy 06:25:13 -25.4 Dark Down 36.6 179.1 Up 06:10:13 - 06:40:13 3304
Portola 06:25:12 -25.7 Dark Down 36.7 179.7 Up 06:10:12 - 06:40:12 3292
Reno 06:25:10 -26.2 Dark Down 37.0 180.5 Up 06:10:10 - 06:40:10 3268
Carson City 06:25:09 -26.5 Dark Down 37.3 180.5 Up 06:10:09 - 06:40:09 3244
Gardnerville 06:25:09 -26.7 Dark Down 37.6 180.5 Up 06:10:09 - 06:40:09 3227
Yerington 06:25:07 -26.9 Dark Down 37.5 181.3 Up 06:10:07 - 06:40:07 3225
Hawthorne 06:25:05 -27.5 Dark Down 38.0 181.9 Up 06:10:05 - 06:40:05 3189
Lee Vining 06:25:07 -27.8 Dark Down 38.5 181.3 Up 06:10:07 - 06:40:07 3155
Tonopah 06:24:59 -28.4 Dark Down 38.4 183.6 Up 06:09:59 - 06:39:59 3142
Niwot 06:24:14 -29.3 Dark Down 34.7 197.6 Up 06:09:14 - 06:39:14 3136
SwRI 06:24:15 -29.4 Dark Down 34.8 197.5 Up 06:09:15 - 06:39:15 3131
Bishop 06:25:05 -28.6 Dark Down 39.1 182.2 Up 06:10:05 - 06:40:05 3106
Beatty 06:24:58 -29.6 Dark Down 39.5 184.3 Up 06:09:58 - 06:39:58 3056
Lone Pine 06:25:03 -29.4 Dark Down 39.9 182.7 Up 06:10:03 - 06:40:03 3049
Indian Springs 06:24:53 -30.2 Dark Down 39.8 185.6 Up 06:09:53 - 06:39:53 3021
CPSLO 06:25:14 -29.6 Dark Down 41.2 179.4 Up 06:10:14 - 06:40:14 2981
Henderson 06:24:51 -30.9 Dark Down 40.2 186.5 Up 06:09:51 - 06:39:51 2975
Searchlight/Boulder City 06:24:51 -31.5 Dark Down 40.8 186.7 Up 06:09:51 - 06:39:51 2933
Patrick 06:24:46 -31.8 Dark Down 40.7 188.0 Up 06:09:46 - 06:39:46 2917
Laughlin/Bullhead City 06:24:49 -31.8 Dark Down 41.1 187.1 Up 06:09:49 - 06:39:49 2907
Kingman/Dolan Springs 06:24:47 -32.0 Dark Down 41.0 187.8 Up 06:09:47 - 06:39:47 2902
Mohave Valley 06:24:49 -32.1 Dark Down 41.3 187.2 Up 06:09:49 - 06:39:49 2887
DCO 06:24:44 -32.3 Dark Down 41.0 188.9 Up 06:09:44 - 06:39:44 2885
Wildwood 06:25:06 -31.5 Dark Down 42.4 182.1 Up 06:10:06 - 06:40:06 2872
Lake Havasu City 06:24:49 -32.6 Dark Down 41.7 187.5 Up 06:09:49 - 06:39:49 2854
Parker 06:24:49 -32.9 Dark Down 42.0 187.6 Up 06:09:49 - 06:39:49 2827
Idyllwild 06:24:58 -32.5 Dark Down 42.7 184.5 Up 06:09:58 - 06:39:58 2825
Blythe 06:24:50 -33.3 Dark Down 42.6 187.3 Up 06:09:50 - 06:39:50 2791
Calipatria 06:24:53 -33.4 Dark Down 43.2 186.1 Up 06:09:53 - 06:39:53 2765
Yuma 06:24:50 -34.1 Dark Down 43.5 187.4 Up 06:09:50 - 06:39:50 2721

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 04KV18, (2025/07/24 06:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.75 135
Nunki          18:55:15.9 -26:17:49  2.0 13.80 168
PPM 234707     18:33:39.1 -14:51:14  6.1  1.37 159
PPM 234736     18:34:47.2 -13:26:05  8.4  0.36 159
PPM 234696     18:33:15.2 -13:29:37  8.6  0.02 158
04KV18         18:33:19.6 -13:29:21 15.5       158
Positions are for J2000

Event circumstances last updated at 2019/06/08 12:45:43 UT

Marc W. Buie, Southwest Research Institute

RECON