RECON: TNO occultation with 576257

Event between (576257) 12JD68 and star GA0960:06160827 with event index number of 2529020

Geocentric closest approach at 2027/06/28 07:55:04 UTC

J2000 position of star is 18:10:35.3 +06:40:58
Equinox of date position of star is 18:11:39.7 +06:41:20
Stellar brightness G=14.3, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 102 degrees from the moon. Moon is 39% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 28.1 AU from the Sun and 27.2 AU from the Earth.
The TNO is moving 22.9 km/sec on the sky relative to the star, or, 4.2 arcsec/hr.
The 1-sigma error in the time of the event is 269 seconds.
The 1-sigma cross-track error in the shadow position is 1026 km.
The sky-plane scale is 19749.5 km/arcsec.

The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 6.0 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 

Star training set for 576257, (2027/06/28 07:55UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:52.1 +38:48:37  0.0 32.65  88
60Bet Oph      17:44:49.9 +04:33:28  2.8  7.07 109
71 Oph         18:08:37.3 +08:44:22  5.6  2.21 102
PPM 165204     18:08:37.3 +06:42:23  8.0  0.82 103
PPM 165362     18:13:26.5 +06:51:44  9.2  0.41 101
PPM 165312     18:11:41.2 +06:31:14 11.3  0.18 102
576257         18:11:55.5 +06:41:25 14.3       101
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 3.3 sigma about the mid-time.
The median site spacing is 26.7 km RECON observability=1.0 and success probability=12.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:54:07 -13.9 AT Up 42.7 202.1 Up 07:39:07 - 08:09:07 3315
Kamloops 07:54:50 -16.0 AT Up 46.0 182.7 Up 07:39:50 - 08:09:50 3235
Kelowna 07:54:47 -16.8 AT Up 46.8 184.0 Up 07:39:47 - 08:09:47 3167
Peachland 07:54:48 -17.0 AT Up 46.9 183.6 Up 07:39:48 - 08:09:48 3159
Summerland 07:54:47 -17.1 AT Up 47.0 183.8 Up 07:39:47 - 08:09:47 3146
Penticton 07:54:47 -17.2 AT Up 47.1 183.9 Up 07:39:47 - 08:09:47 3140
Oliver 07:54:48 -17.5 AT Up 47.4 183.9 Up 07:39:48 - 08:09:48 3112
Anarchist Mountain Observatory 07:54:47 -17.7 AT Up 47.6 184.2 Up 07:39:47 - 08:09:47 3097
Tonasket 07:54:47 -18.0 Dark Up 47.9 184.2 Up 07:39:47 - 08:09:47 3072
Victoria 07:55:00 -18.0 Dark Down 48.2 178.3 Up 07:40:00 - 08:10:00 3071
Okanogan 07:54:47 -18.3 Dark Up 48.3 184.0 Up 07:39:47 - 08:09:47 3044
Brewster 07:54:48 -18.6 Dark Up 48.5 183.7 Up 07:39:48 - 08:09:48 3022
Manson/Chelan 07:54:49 -18.8 Dark Up 48.8 183.2 Up 07:39:49 - 08:09:49 3006
Wenatchee 07:54:50 -19.3 Dark Up 49.2 182.9 Up 07:39:50 - 08:09:50 2967
Ellensburg 07:54:51 -19.7 Dark Up 49.7 182.6 Up 07:39:51 - 08:09:51 2933
Yakima 07:54:51 -20.1 Dark Up 50.1 182.6 Up 07:39:51 - 08:09:51 2898
Toppenish/White Swan 07:54:50 -20.3 Dark Up 50.3 182.9 Up 07:39:50 - 08:09:50 2879
PNWRO 07:54:45 -20.7 Dark Up 50.6 185.2 Up 07:39:45 - 08:09:45 2842
Goldendale 07:54:52 -20.8 Dark Up 50.8 182.3 Up 07:39:52 - 08:09:52 2833
The Dalles 07:54:53 -21.1 Dark Up 51.1 181.7 Up 07:39:53 - 08:09:53 2815
Maupin 07:54:53 -21.5 Dark Up 51.5 181.9 Up 07:39:53 - 08:09:53 2779
Sisters 07:54:55 -22.3 Dark Down 52.4 181.1 Up 07:39:55 - 08:09:55 2704
Bend 07:54:53 -22.6 Dark Down 52.6 181.6 Up 07:39:53 - 08:09:53 2682
Oregon Observatory 07:54:54 -22.8 Dark Down 52.8 181.4 Up 07:39:54 - 08:09:54 2667
North Lake 07:54:52 -23.4 Dark Down 53.4 182.3 Up 07:39:52 - 08:09:52 2608
Chiloquin 07:54:56 -24.1 Dark Down 54.1 180.7 Up 07:39:56 - 08:09:56 2552
Klamath Falls 07:54:56 -24.4 Dark Down 54.5 180.8 Up 07:39:56 - 08:09:56 2520
Lakeview 07:54:51 -24.5 Dark Down 54.5 183.3 Up 07:39:51 - 08:09:51 2511
Cedarville 07:54:50 -25.2 Dark Down 55.1 183.6 Up 07:39:50 - 08:09:50 2451
Fall River/Burney 07:54:54 -25.6 Dark Down 55.6 181.5 Up 07:39:54 - 08:09:54 2411
Susanville 07:54:52 -26.3 Dark Down 56.2 182.9 Up 07:39:52 - 08:09:52 2350
Greenville 07:54:53 -26.5 Dark Down 56.5 182.4 Up 07:39:53 - 08:09:53 2326
Gimple 07:54:53 -26.5 Dark Down 56.5 182.5 Up 07:39:53 - 08:09:53 2325
Quincy 07:54:53 -26.7 Dark Down 56.7 182.4 Up 07:39:53 - 08:09:53 2307
Portola 07:54:51 -26.9 Dark Down 56.8 183.3 Up 07:39:51 - 08:09:51 2294
Dunrhomin 07:53:56 -25.4 Dark Up 53.2 208.7 Up 07:38:56 - 08:08:56 2293
Reno 07:54:49 -27.1 Dark Down 57.1 184.4 Up 07:39:49 - 08:09:49 2266
Carson City 07:54:49 -27.5 Dark Down 57.4 184.5 Up 07:39:49 - 08:09:49 2233
Yerington 07:54:46 -27.7 Dark Down 57.6 185.7 Up 07:39:46 - 08:09:46 2212
Gardnerville 07:54:49 -27.8 Dark Down 57.7 184.6 Up 07:39:49 - 08:09:49 2210
Hawthorne 07:54:45 -28.2 Dark Down 58.0 186.8 Up 07:39:45 - 08:09:45 2166
Tonopah 07:54:39 -28.7 Dark Up 58.3 189.5 Up 07:39:39 - 08:09:39 2117
Lee Vining 07:54:46 -28.7 Dark Down 58.6 185.9 Up 07:39:46 - 08:09:46 2115
Bishop 07:54:44 -29.4 Dark Down 59.1 187.4 Up 07:39:44 - 08:09:44 2055
Beatty 07:54:37 -29.8 Dark Up 59.4 190.7 Up 07:39:37 - 08:09:37 2004
Indian Springs 07:54:33 -30.1 Dark Up 59.5 192.8 Up 07:39:33 - 08:09:33 1969
Henderson 07:54:31 -30.6 Dark Up 59.9 194.4 Up 07:39:31 - 08:09:31 1915
Patrick 07:54:26 -31.2 Dark Up 60.3 196.8 Up 07:39:26 - 08:09:26 1850
Kingman/Dolan Springs 07:54:27 -31.4 Dark Up 60.5 196.5 Up 07:39:27 - 08:09:27 1829
Laughlin/Bullhead City 07:54:29 -31.5 Dark Up 60.7 195.5 Up 07:39:29 - 08:09:29 1828
Mohave Valley 07:54:29 -31.7 Dark Up 60.9 195.7 Up 07:39:29 - 08:09:29 1801
Lake Havasu City 07:54:28 -32.1 Dark Up 61.3 196.4 Up 07:39:28 - 08:09:28 1761
Wildwood 07:54:45 -32.6 Dark Down 62.4 187.8 Up 07:39:45 - 08:09:45 1738
Parker 07:54:27 -32.5 Dark Up 61.6 196.6 Up 07:39:27 - 08:09:27 1727
Idyllwild 07:54:37 -33.0 Dark Up 62.5 191.9 Up 07:39:37 - 08:09:37 1695
George/Scottsdale 07:54:18 -32.7 Dark Up 61.3 201.7 Up 07:39:18 - 08:09:18 1677
Calipatria 07:54:32 -33.6 Dark Up 62.8 194.6 Up 07:39:32 - 08:09:32 1630
Yuma 07:54:29 -33.9 Dark Up 63.1 196.7 Up 07:39:29 - 08:09:29 1584

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 576257, (2027/06/28 07:55UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 32.65  88
60Bet Oph      17:43:28.3 +04:34:06  2.8  7.07 109
71 Oph         18:07:18.4 +08:44:03  5.6  2.21 102
PPM 165204     18:07:17.1 +06:42:03  8.0  0.82 103
PPM 165362     18:12:06.4 +06:51:13  9.2  0.41 101
PPM 165312     18:10:20.8 +06:30:47 11.3  0.18 102
576257         18:10:35.3 +06:40:58 14.3       102
Positions are for J2000

Event circumstances last updated at 2022/01/26 00:32:50 UT

Marc W. Buie, Southwest Research Institute

RECON