RECON: TNO occultation with 15BY518

Event between 15BY518 and star GA0820:03952150 with event index number of 1430898

Geocentric closest approach at 2025/02/11 07:01:29 UTC

J2000 position of star is 10:07:57.6 -06:57:28
Equinox of date position of star is 10:08:55.9 -07:03:12
Stellar brightness G=15.5, use SENSEUP=128
Star is 36 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 37.6 AU from the Sun and 36.7 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 492 seconds.
The 1-sigma cross-track error in the shadow position is 5702 km.
The sky-plane scale is 26588.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.4
Diameter=310.5 km assuming a 5% albedo -- 12.8 sec chord
Diameter=126.7 km assuming a 30% albedo -- 5.2 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 15BY518, (2025/02/11 07:01UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:42.5 +11:50:37  1.3 18.93  22
Alphard        09:28:49.3 -08:46:07  2.0 10.14  33
17 Sex         10:11:22.4 -08:31:57  6.0  1.55  37
PPM 193105     10:08:48.8 -06:33:44  8.0  0.53  35
PPM 193115     10:09:39.6 -07:03:36  9.6  0.11  36
15BY518        10:09:12.9 -07:04:53 15.5        36
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 1.8 sigma about the mid-time.
The median site spacing is 13.9 km RECON observability=1.0 and success probability=6.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:03:52 -51.4 Dark Up 29.5 152.6 Low 06:48:52 - 07:18:52 939
Summerland 07:03:53 -51.6 Dark Up 29.7 152.2 Low 06:48:53 - 07:18:53 911
Penticton 07:03:52 -51.7 Dark Up 29.8 152.3 Low 06:48:52 - 07:18:52 909
Okanagan Falls 07:03:52 -51.9 Dark Up 29.9 152.2 Low 06:48:52 - 07:18:52 895
Oliver 07:03:52 -52.0 Dark Up 30.1 152.2 Up 06:48:52 - 07:18:52 884
Anarchist Mountain Observatory 07:03:52 -52.2 Dark Up 30.3 152.4 Up 06:48:52 - 07:18:52 877
Oroville 07:03:52 -52.3 Dark Up 30.3 152.3 Up 06:48:52 - 07:18:52 870
Tonasket 07:03:52 -52.5 Dark Up 30.5 152.2 Up 06:48:52 - 07:18:52 853
Okanogan 07:03:53 -52.7 Dark Up 30.8 152.0 Up 06:48:53 - 07:18:53 825
Brewster 07:03:53 -52.9 Dark Up 31.0 151.7 Up 06:48:53 - 07:18:53 800
Manson/Chelan 07:03:54 -53.0 Dark Up 31.0 151.2 Up 06:48:54 - 07:18:54 775
Entiat 07:03:55 -53.1 Dark Up 31.2 151.1 Up 06:48:55 - 07:18:55 757
Wenatchee 07:03:55 -53.3 Dark Up 31.4 150.9 Up 06:48:55 - 07:18:55 736
Ellensburg 07:03:56 -53.6 Dark Up 31.7 150.5 Up 06:48:56 - 07:18:56 699
Pasco 07:03:52 -54.7 Dark Up 32.8 151.9 Up 06:48:52 - 07:18:52 684
PNWRO 07:03:51 -55.0 Dark Up 33.1 152.0 Up 06:48:51 - 07:18:51 672
Yakima 07:03:56 -54.0 Dark Up 32.0 150.4 Up 06:48:56 - 07:18:56 668
Toppenish/White Swan 07:03:55 -54.2 Dark Up 32.3 150.5 Up 06:48:55 - 07:18:55 657
George/Umatilla 07:03:53 -55.0 Dark Up 33.0 151.5 Up 06:48:53 - 07:18:53 652
Niwot 07:03:10 -63.7 Dark Up 42.1 166.9 Up 06:48:10 - 07:18:10 640
SwRI 07:03:10 -63.8 Dark Up 42.2 166.7 Up 06:48:10 - 07:18:10 629
Goldendale 07:03:57 -54.5 Dark Up 32.6 149.9 Up 06:48:57 - 07:18:57 603
The Dalles 07:03:58 -54.6 Dark Up 32.7 149.4 Up 06:48:58 - 07:18:58 576
Maupin 07:03:58 -55.0 Dark Up 33.1 149.4 Up 06:48:58 - 07:18:58 547
Madras/Culver 07:03:58 -55.4 Dark Up 33.5 149.1 Up 06:48:58 - 07:18:58 503
Redmond 07:03:58 -55.7 Dark Up 33.8 149.0 Up 06:48:58 - 07:18:58 474
Sisters 07:03:59 -55.5 Dark Up 33.7 148.5 Up 06:48:59 - 07:18:59 464
Bend 07:03:59 -55.8 Dark Up 34.0 148.7 Up 06:48:59 - 07:18:59 453
Oregon Observatory 07:03:59 -55.9 Dark Up 34.1 148.5 Up 06:48:59 - 07:18:59 436
La Pine/Gilchrist 07:04:00 -56.1 Dark Up 34.2 148.4 Up 06:49:00 - 07:19:00 418
North Lake 07:03:58 -56.7 Dark Up 34.8 148.9 Up 06:48:58 - 07:18:58 402
Paisley 07:03:57 -57.3 Dark Up 35.4 149.1 Up 06:48:57 - 07:18:57 369
Lakeview 07:03:57 -57.8 Dark Up 35.9 149.1 Up 06:48:57 - 07:18:57 334
Chiloquin 07:04:01 -56.8 Dark Up 35.0 147.6 Up 06:49:01 - 07:19:01 319
Klamath Falls 07:04:00 -57.1 Dark Up 35.3 147.5 Up 06:49:00 - 07:19:00 294
Cedarville 07:03:56 -58.4 Dark Up 36.5 149.1 Up 06:48:56 - 07:18:56 287
Tulelake 07:04:00 -57.5 Dark Up 35.7 147.8 Up 06:49:00 - 07:19:00 282
Fall River/Burney 07:03:59 -58.2 Dark Up 36.5 147.5 Up 06:48:59 - 07:18:59 211
Susanville 07:03:58 -59.1 Dark Up 37.3 148.1 Up 06:48:58 - 07:18:58 182
Gimple 07:03:58 -59.2 Dark Up 37.5 147.7 Up 06:48:58 - 07:18:58 152
Greenville 07:03:58 -59.2 Dark Up 37.4 147.7 Up 06:48:58 - 07:18:58 150
Portola 07:03:57 -59.7 Dark Up 37.9 148.1 Up 06:48:57 - 07:18:57 138
Reno 07:03:55 -60.2 Dark Up 38.4 148.7 Up 06:48:55 - 07:18:55 136
Quincy 07:03:58 -59.3 Dark Up 37.6 147.6 Up 06:48:58 - 07:18:58 134
Yerington 07:03:53 -60.9 Dark Up 39.1 149.2 Up 06:48:53 - 07:18:53 111
Carson City 07:03:55 -60.5 Dark Up 38.7 148.6 Up 06:48:55 - 07:18:55 107
Tonopah 07:03:47 -62.5 Dark Up 40.7 151.1 Up 06:48:47 - 07:18:47 96
Hawthorne 07:03:52 -61.5 Dark Up 39.7 149.6 Up 06:48:52 - 07:18:52 90
Gardnerville 07:03:55 -60.7 Dark Up 38.9 148.5 Up 06:48:55 - 07:18:55 89
Lee Vining 07:03:53 -61.8 Dark Up 40.0 148.8 Up 06:48:53 - 07:18:53 27
Indian Springs 07:03:42 -64.4 Dark Up 42.6 152.4 Up 06:48:42 - 07:18:42 22
Beatty 07:03:46 -63.7 Dark Up 41.9 151.2 Up 06:48:46 - 07:18:46 14
Henderson 07:03:40 -65.2 Dark Up 43.3 153.0 Up 06:48:40 - 07:18:40 1
Bishop 07:03:51 -62.6 Dark Up 40.8 149.4 Up 06:48:51 - 07:18:51 -1
Patrick 07:03:36 -66.1 Dark Up 44.2 154.1 Up 06:48:36 - 07:18:36 -16
DCO 07:03:34 -66.7 Dark Up 44.8 154.9 Up 06:48:34 - 07:18:34 -18
Kingman/Dolan Springs 07:03:37 -66.3 Dark Up 44.4 153.8 Up 06:48:37 - 07:18:37 -41
Searchlight/Boulder City 07:03:40 -65.7 Dark Up 43.8 152.8 Up 06:48:40 - 07:18:40 -46
Lone Pine 07:03:50 -63.3 Dark Up 41.6 149.5 Up 06:48:50 - 07:18:50 -53
Laughlin/Bullhead City 07:03:38 -66.1 Dark Up 44.2 153.1 Up 06:48:38 - 07:18:38 -60
Mohave Valley 07:03:38 -66.3 Dark Up 44.5 153.0 Up 06:48:38 - 07:18:38 -83
Lake Havasu City 07:03:37 -66.8 Dark Up 44.9 153.2 Up 06:48:37 - 07:18:37 -109
Parker 07:03:37 -67.1 Dark Up 45.2 153.0 Up 06:48:37 - 07:18:37 -138
Blythe 07:03:38 -67.4 Dark Up 45.6 152.4 Up 06:48:38 - 07:18:38 -193
CPSLO 07:03:58 -63.1 Dark Up 41.6 145.8 Up 06:48:58 - 07:18:58 -250
Idyllwild 07:03:45 -66.3 Dark Up 44.6 149.8 Up 06:48:45 - 07:18:45 -255
Calipatria 07:03:41 -67.4 Dark Up 45.6 151.0 Up 06:48:41 - 07:18:41 -268
Yuma 07:03:38 -68.1 Dark Up 46.4 151.9 Up 06:48:38 - 07:18:38 -275
Wildwood 07:03:51 -65.1 Dark Up 43.5 147.6 Up 06:48:51 - 07:18:51 -287

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 15BY518, (2025/02/11 07:01UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 18.93  22
Alphard        09:27:35.2 -08:39:31  2.0 10.14  33
17 Sex         10:10:07.5 -08:24:30  6.0  1.55  37
PPM 193105     10:07:33.3 -06:26:19  8.0  0.53  35
PPM 193115     10:08:24.3 -06:56:11  9.6  0.11  36
15BY518        10:07:57.6 -06:57:28 15.5        36
Positions are for J2000

Event circumstances last updated at 2019/06/08 10:07:12 UT

Marc W. Buie, Southwest Research Institute

RECON