RECON: TNO occultation with 04KC19

Event between 04KC19 and star GA0700:29345005 with event index number of 1450084

Geocentric closest approach at 2025/07/31 06:29:13 UTC

J2000 position of star is 18:45:42.0 -19:11:28
Equinox of date position of star is 18:46:50.6 -19:10:10
Stellar brightness G=13.3, use SENSEUP=32
Star is 77 degrees from the moon. Moon is 38% illuminated.
TNO apparent brightness V=23.5

[RECON map]
TNO is 31.0 AU from the Sun and 30.1 AU from the Earth.
The TNO is moving 20.2 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 1474 seconds.
The 1-sigma cross-track error in the shadow position is 4597 km.
The sky-plane scale is 21845.3 km/arcsec.

The TNO has an absolute magnitude Hv=8.5
Diameter=121.3 km assuming a 5% albedo -- 6.0 sec chord
Diameter=49.5 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 04KC19, (2025/07/31 06:29UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.8 -26:29:11  0.9 32.13  45
Nunki          18:56:51.0 -26:15:45  2.0  7.44  78
PPM 234997     18:47:31.7 -19:34:39  6.3  0.42  77
PPM 234996     18:47:26.3 -19:03:13  8.3  0.12  77
04KC19         18:47:12.3 -19:09:45 13.3        77
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 0.6 sigma about the mid-time.
The median site spacing is 12.3 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 06:28:25 -18.7 Dark Down 20.7 185.5 Low 06:13:25 - 06:43:25 1774
Summerland 06:28:25 -18.9 Dark Down 21.1 185.2 Low 06:13:25 - 06:43:25 1764
Penticton 06:28:25 -19.0 Dark Down 21.1 185.3 Low 06:13:25 - 06:43:25 1761
Okanagan Falls 06:28:25 -19.2 Dark Down 21.3 185.3 Low 06:13:25 - 06:43:25 1753
Oliver 06:28:25 -19.3 Dark Down 21.5 185.3 Low 06:13:25 - 06:43:25 1746
Anarchist Mountain Observatory 06:28:24 -19.5 Dark Down 21.6 185.5 Low 06:13:24 - 06:43:24 1737
Oroville 06:28:25 -19.6 Dark Down 21.7 185.5 Low 06:13:25 - 06:43:25 1735
Tonasket 06:28:25 -19.8 Dark Down 21.9 185.5 Low 06:13:25 - 06:43:25 1725
Okanogan 06:28:25 -20.1 Dark Down 22.3 185.3 Low 06:13:25 - 06:43:25 1712
Brewster 06:28:26 -20.3 Dark Down 22.6 185.1 Low 06:13:26 - 06:43:26 1702
Manson/Chelan 06:28:27 -20.3 Dark Down 22.8 184.8 Low 06:13:27 - 06:43:27 1696
Entiat 06:28:27 -20.5 Dark Down 23.0 184.7 Low 06:13:27 - 06:43:27 1687
Wenatchee 06:28:28 -20.7 Dark Down 23.3 184.6 Low 06:13:28 - 06:43:28 1677
Ellensburg 06:28:28 -21.0 Dark Down 23.7 184.4 Low 06:13:28 - 06:43:28 1660
Yakima 06:28:28 -21.4 Dark Down 24.1 184.4 Low 06:13:28 - 06:43:28 1642
Toppenish/White Swan 06:28:28 -21.6 Dark Down 24.3 184.6 Low 06:13:28 - 06:43:28 1630
Pasco 06:28:23 -22.1 Dark Down 24.4 185.9 Low 06:13:23 - 06:43:23 1612
Goldendale 06:28:29 -22.0 Dark Down 24.9 184.2 Low 06:13:29 - 06:43:29 1609
The Dalles 06:28:31 -22.1 Dark Down 25.1 183.8 Low 06:13:31 - 06:43:31 1601
George/Umatilla 06:28:24 -22.4 Dark Down 24.7 185.7 Low 06:13:24 - 06:43:24 1598
PNWRO 06:28:22 -22.4 Dark Down 24.6 186.1 Low 06:13:22 - 06:43:22 1598
Maupin 06:28:30 -22.5 Dark Down 25.5 183.9 Low 06:13:30 - 06:43:30 1580
Madras/Culver 06:28:30 -23.0 Dark Down 26.1 183.9 Low 06:13:30 - 06:43:30 1554
Sisters 06:28:32 -23.1 Dark Down 26.4 183.4 Low 06:13:32 - 06:43:32 1542
Redmond 06:28:31 -23.3 Dark Down 26.4 183.9 Low 06:13:31 - 06:43:31 1537
Bend 06:28:31 -23.4 Dark Down 26.7 183.7 Low 06:13:31 - 06:43:31 1527
Oregon Observatory 06:28:32 -23.5 Dark Down 26.8 183.6 Low 06:13:32 - 06:43:32 1520
La Pine/Gilchrist 06:28:32 -23.7 Dark Down 27.1 183.5 Low 06:13:32 - 06:43:32 1510
North Lake 06:28:29 -24.3 Dark Down 27.5 184.2 Low 06:13:29 - 06:43:29 1482
Chiloquin 06:28:33 -24.6 Dark Down 28.2 183.2 Low 06:13:33 - 06:43:33 1456
Paisley 06:28:28 -24.9 Dark Down 28.0 184.6 Low 06:13:28 - 06:43:28 1449
Klamath Falls 06:28:33 -24.9 Dark Down 28.5 183.3 Low 06:13:33 - 06:43:33 1437
Lakeview 06:28:27 -25.4 Dark Down 28.5 184.8 Low 06:13:27 - 06:43:27 1420
Tulelake 06:28:32 -25.3 Dark Down 28.8 183.6 Low 06:13:32 - 06:43:32 1419
Cedarville 06:28:27 -26.1 Dark Down 29.1 185.0 Low 06:13:27 - 06:43:27 1383
Fall River/Burney 06:28:32 -26.1 Dark Down 29.7 183.7 Low 06:13:32 - 06:43:32 1369
Susanville 06:28:29 -26.9 Dark Down 30.3 184.6 Up 06:13:29 - 06:43:29 1326
Greenville 06:28:30 -27.0 Dark Down 30.6 184.3 Up 06:13:30 - 06:43:30 1314
Gimple 06:28:29 -27.1 Dark Down 30.6 184.4 Up 06:13:29 - 06:43:29 1313
Quincy 06:28:30 -27.2 Dark Down 30.8 184.3 Up 06:13:30 - 06:43:30 1302
Portola 06:28:28 -27.5 Dark Down 30.9 184.8 Up 06:13:28 - 06:43:28 1290
Reno 06:28:25 -28.0 Dark Down 31.1 185.5 Up 06:13:25 - 06:43:25 1267
Carson City 06:28:25 -28.3 Dark Down 31.4 185.6 Up 06:13:25 - 06:43:25 1246
Gardnerville 06:28:25 -28.5 Dark Down 31.7 185.6 Up 06:13:25 - 06:43:25 1231
Yerington 06:28:22 -28.7 Dark Down 31.6 186.3 Up 06:13:22 - 06:43:22 1227
Hawthorne 06:28:20 -29.3 Dark Down 32.0 186.9 Up 06:13:20 - 06:43:20 1194
Lee Vining 06:28:22 -29.6 Dark Down 32.6 186.4 Up 06:13:22 - 06:43:22 1165
Tonopah 06:28:14 -30.2 Dark Down 32.3 188.5 Up 06:13:14 - 06:43:14 1148
Bishop 06:28:20 -30.4 Dark Down 33.1 187.2 Up 06:13:20 - 06:43:20 1120
Niwot 06:27:27 -31.0 Dark Down 28.0 200.8 Low 06:12:27 - 06:42:27 1092
SwRI 06:27:27 -31.1 Dark Down 28.1 200.7 Low 06:12:27 - 06:42:27 1088
Beatty 06:28:12 -31.4 Dark Down 33.4 189.1 Up 06:13:12 - 06:43:12 1071
Lone Pine 06:28:18 -31.2 Dark Down 33.8 187.7 Up 06:13:18 - 06:43:18 1069
Indian Springs 06:28:08 -32.0 Dark Down 33.6 190.3 Up 06:13:08 - 06:43:08 1036
CPSLO 06:28:29 -31.4 Dark Down 35.4 184.8 Up 06:13:29 - 06:43:29 1017
Henderson 06:28:05 -32.7 Dark Down 34.0 191.1 Up 06:13:05 - 06:43:05 993
Searchlight/Boulder City 06:28:04 -33.3 Dark Down 34.6 191.3 Up 06:13:04 - 06:43:04 954
Patrick 06:28:00 -33.6 Dark Down 34.4 192.4 Up 06:13:00 - 06:43:00 936
Laughlin/Bullhead City 06:28:03 -33.6 Dark Down 34.8 191.7 Up 06:13:03 - 06:43:03 930
Kingman/Dolan Springs 06:28:00 -33.8 Dark Down 34.7 192.3 Up 06:13:00 - 06:43:00 924
Wildwood 06:28:20 -33.3 Dark Down 36.4 187.3 Up 06:13:20 - 06:43:20 913
Mohave Valley 06:28:02 -33.9 Dark Down 35.1 191.7 Up 06:13:02 - 06:43:02 912
DCO 06:27:57 -34.1 Dark Down 34.6 193.3 Up 06:12:57 - 06:42:57 905
Lake Havasu City 06:28:01 -34.3 Dark Down 35.4 192.1 Up 06:13:01 - 06:43:01 882
Idyllwild 06:28:12 -34.3 Dark Down 36.5 189.5 Up 06:13:12 - 06:43:12 864
Parker 06:28:01 -34.7 Dark Down 35.7 192.2 Up 06:13:01 - 06:43:01 858
Blythe 06:28:03 -35.1 Dark Down 36.3 191.9 Up 06:13:03 - 06:43:03 827
Calipatria 06:28:06 -35.2 Dark Down 36.9 190.9 Up 06:13:06 - 06:43:06 806
Yuma 06:28:02 -35.9 Dark Down 37.2 192.0 Up 06:13:02 - 06:43:02 763

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 04KC19, (2025/07/31 06:29UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.13  45
Nunki          18:55:15.9 -26:17:49  2.0  7.44  78
PPM 234997     18:46:01.2 -19:36:23  6.3  0.42  77
PPM 234996     18:45:56.1 -19:04:56  8.3  0.12  77
04KC19         18:45:42.0 -19:11:28 13.3        76
Positions are for J2000

Event circumstances last updated at 2019/06/08 12:47:44 UT

Marc W. Buie, Southwest Research Institute

RECON